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1350 lines
40 KiB
1350 lines
40 KiB
/*! Scroller 1.4.2
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* ©2011-2016 SpryMedia Ltd - datatables.net/license
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*/
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/**
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* @summary Scroller
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* @description Virtual rendering for DataTables
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* @version 1.4.2
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* @file dataTables.scroller.js
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* @author SpryMedia Ltd (www.sprymedia.co.uk)
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* @contact www.sprymedia.co.uk/contact
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* @copyright Copyright 2011-2016 SpryMedia Ltd.
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*
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* This source file is free software, available under the following license:
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* MIT license - http://datatables.net/license/mit
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*
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* This source file is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the license files for details.
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*
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* For details please refer to: http://www.datatables.net
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*/
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(function( factory ){
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if ( typeof define === 'function' && define.amd ) {
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// AMD
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define( ['jquery', 'datatables.net'], function ( $ ) {
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return factory( $, window, document );
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} );
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}
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else if ( typeof exports === 'object' ) {
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// CommonJS
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module.exports = function (root, $) {
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if ( ! root ) {
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root = window;
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}
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if ( ! $ || ! $.fn.dataTable ) {
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$ = require('datatables.net')(root, $).$;
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}
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return factory( $, root, root.document );
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};
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}
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else {
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// Browser
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factory( jQuery, window, document );
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}
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}(function( $, window, document, undefined ) {
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'use strict';
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var DataTable = $.fn.dataTable;
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/**
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* Scroller is a virtual rendering plug-in for DataTables which allows large
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* datasets to be drawn on screen every quickly. What the virtual rendering means
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* is that only the visible portion of the table (and a bit to either side to make
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* the scrolling smooth) is drawn, while the scrolling container gives the
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* visual impression that the whole table is visible. This is done by making use
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* of the pagination abilities of DataTables and moving the table around in the
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* scrolling container DataTables adds to the page. The scrolling container is
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* forced to the height it would be for the full table display using an extra
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* element.
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*
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* Note that rows in the table MUST all be the same height. Information in a cell
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* which expands on to multiple lines will cause some odd behaviour in the scrolling.
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*
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* Scroller is initialised by simply including the letter 'S' in the sDom for the
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* table you want to have this feature enabled on. Note that the 'S' must come
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* AFTER the 't' parameter in `dom`.
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*
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* Key features include:
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* <ul class="limit_length">
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* <li>Speed! The aim of Scroller for DataTables is to make rendering large data sets fast</li>
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* <li>Full compatibility with deferred rendering in DataTables for maximum speed</li>
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* <li>Display millions of rows</li>
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* <li>Integration with state saving in DataTables (scrolling position is saved)</li>
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* <li>Easy to use</li>
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* </ul>
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*
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* @class
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* @constructor
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* @global
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* @param {object} dt DataTables settings object or API instance
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* @param {object} [opts={}] Configuration object for FixedColumns. Options
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* are defined by {@link Scroller.defaults}
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*
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* @requires jQuery 1.7+
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* @requires DataTables 1.10.0+
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*
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* @example
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* $(document).ready(function() {
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* $('#example').DataTable( {
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* "scrollY": "200px",
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* "ajax": "media/dataset/large.txt",
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* "dom": "frtiS",
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* "deferRender": true
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* } );
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* } );
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*/
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var Scroller = function ( dt, opts ) {
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/* Sanity check - you just know it will happen */
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if ( ! (this instanceof Scroller) ) {
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alert( "Scroller warning: Scroller must be initialised with the 'new' keyword." );
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return;
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}
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if ( opts === undefined ) {
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opts = {};
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}
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/**
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* Settings object which contains customisable information for the Scroller instance
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* @namespace
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* @private
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* @extends Scroller.defaults
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*/
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this.s = {
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/**
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* DataTables settings object
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* @type object
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* @default Passed in as first parameter to constructor
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*/
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"dt": $.fn.dataTable.Api( dt ).settings()[0],
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/**
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* Pixel location of the top of the drawn table in the viewport
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* @type int
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* @default 0
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*/
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"tableTop": 0,
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/**
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* Pixel location of the bottom of the drawn table in the viewport
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* @type int
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* @default 0
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*/
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"tableBottom": 0,
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/**
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* Pixel location of the boundary for when the next data set should be loaded and drawn
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* when scrolling up the way.
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* @type int
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* @default 0
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* @private
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*/
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"redrawTop": 0,
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/**
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* Pixel location of the boundary for when the next data set should be loaded and drawn
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* when scrolling down the way. Note that this is actually calculated as the offset from
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* the top.
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* @type int
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* @default 0
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* @private
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*/
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"redrawBottom": 0,
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/**
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* Auto row height or not indicator
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* @type bool
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* @default 0
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*/
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"autoHeight": true,
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/**
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* Number of rows calculated as visible in the visible viewport
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* @type int
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* @default 0
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*/
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"viewportRows": 0,
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/**
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* setTimeout reference for state saving, used when state saving is enabled in the DataTable
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* and when the user scrolls the viewport in order to stop the cookie set taking too much
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* CPU!
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* @type int
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* @default 0
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*/
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"stateTO": null,
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/**
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* setTimeout reference for the redraw, used when server-side processing is enabled in the
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* DataTables in order to prevent DoSing the server
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* @type int
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* @default null
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*/
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"drawTO": null,
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heights: {
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jump: null,
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page: null,
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virtual: null,
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scroll: null,
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/**
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* Height of rows in the table
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* @type int
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* @default 0
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*/
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row: null,
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/**
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* Pixel height of the viewport
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* @type int
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* @default 0
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*/
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viewport: null
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},
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topRowFloat: 0,
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scrollDrawDiff: null,
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loaderVisible: false
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};
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// @todo The defaults should extend a `c` property and the internal settings
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// only held in the `s` property. At the moment they are mixed
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this.s = $.extend( this.s, Scroller.oDefaults, opts );
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// Workaround for row height being read from height object (see above comment)
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this.s.heights.row = this.s.rowHeight;
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/**
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* DOM elements used by the class instance
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* @private
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* @namespace
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*
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*/
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this.dom = {
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"force": document.createElement('div'),
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"scroller": null,
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"table": null,
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"loader": null
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};
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// Attach the instance to the DataTables instance so it can be accessed in
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// future. Don't initialise Scroller twice on the same table
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if ( this.s.dt.oScroller ) {
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return;
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}
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this.s.dt.oScroller = this;
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/* Let's do it */
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this._fnConstruct();
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};
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$.extend( Scroller.prototype, {
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Public methods
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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/**
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* Calculate the pixel position from the top of the scrolling container for
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* a given row
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* @param {int} iRow Row number to calculate the position of
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* @returns {int} Pixels
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* @example
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* $(document).ready(function() {
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* $('#example').dataTable( {
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* "sScrollY": "200px",
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* "sAjaxSource": "media/dataset/large.txt",
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* "sDom": "frtiS",
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* "bDeferRender": true,
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* "fnInitComplete": function (o) {
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* // Find where row 25 is
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* alert( o.oScroller.fnRowToPixels( 25 ) );
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* }
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* } );
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* } );
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*/
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"fnRowToPixels": function ( rowIdx, intParse, virtual )
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{
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var pixels;
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if ( virtual ) {
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pixels = this._domain( 'virtualToPhysical', rowIdx * this.s.heights.row );
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}
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else {
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var diff = rowIdx - this.s.baseRowTop;
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pixels = this.s.baseScrollTop + (diff * this.s.heights.row);
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}
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return intParse || intParse === undefined ?
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parseInt( pixels, 10 ) :
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pixels;
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},
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/**
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* Calculate the row number that will be found at the given pixel position
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* (y-scroll).
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*
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* Please note that when the height of the full table exceeds 1 million
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* pixels, Scroller switches into a non-linear mode for the scrollbar to fit
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* all of the records into a finite area, but this function returns a linear
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* value (relative to the last non-linear positioning).
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* @param {int} iPixels Offset from top to calculate the row number of
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* @param {int} [intParse=true] If an integer value should be returned
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* @param {int} [virtual=false] Perform the calculations in the virtual domain
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* @returns {int} Row index
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* @example
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* $(document).ready(function() {
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* $('#example').dataTable( {
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* "sScrollY": "200px",
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* "sAjaxSource": "media/dataset/large.txt",
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* "sDom": "frtiS",
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* "bDeferRender": true,
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* "fnInitComplete": function (o) {
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* // Find what row number is at 500px
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* alert( o.oScroller.fnPixelsToRow( 500 ) );
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* }
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* } );
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* } );
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*/
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"fnPixelsToRow": function ( pixels, intParse, virtual )
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{
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var diff = pixels - this.s.baseScrollTop;
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var row = virtual ?
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this._domain( 'physicalToVirtual', pixels ) / this.s.heights.row :
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( diff / this.s.heights.row ) + this.s.baseRowTop;
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return intParse || intParse === undefined ?
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parseInt( row, 10 ) :
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row;
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},
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/**
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* Calculate the row number that will be found at the given pixel position (y-scroll)
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* @param {int} iRow Row index to scroll to
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* @param {bool} [bAnimate=true] Animate the transition or not
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* @returns {void}
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* @example
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* $(document).ready(function() {
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* $('#example').dataTable( {
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* "sScrollY": "200px",
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* "sAjaxSource": "media/dataset/large.txt",
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* "sDom": "frtiS",
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* "bDeferRender": true,
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* "fnInitComplete": function (o) {
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* // Immediately scroll to row 1000
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* o.oScroller.fnScrollToRow( 1000 );
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* }
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* } );
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*
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* // Sometime later on use the following to scroll to row 500...
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* var oSettings = $('#example').dataTable().fnSettings();
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* oSettings.oScroller.fnScrollToRow( 500 );
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* } );
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*/
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"fnScrollToRow": function ( iRow, bAnimate )
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{
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var that = this;
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var ani = false;
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var px = this.fnRowToPixels( iRow );
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// We need to know if the table will redraw or not before doing the
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// scroll. If it will not redraw, then we need to use the currently
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// displayed table, and scroll with the physical pixels. Otherwise, we
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// need to calculate the table's new position from the virtual
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// transform.
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var preRows = ((this.s.displayBuffer-1)/2) * this.s.viewportRows;
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var drawRow = iRow - preRows;
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if ( drawRow < 0 ) {
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drawRow = 0;
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}
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if ( (px > this.s.redrawBottom || px < this.s.redrawTop) && this.s.dt._iDisplayStart !== drawRow ) {
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ani = true;
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px = this.fnRowToPixels( iRow, false, true );
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}
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if ( typeof bAnimate == 'undefined' || bAnimate )
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{
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this.s.ani = ani;
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$(this.dom.scroller).animate( {
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"scrollTop": px
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}, function () {
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// This needs to happen after the animation has completed and
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// the final scroll event fired
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setTimeout( function () {
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that.s.ani = false;
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}, 25 );
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} );
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}
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else
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{
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$(this.dom.scroller).scrollTop( px );
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}
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},
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/**
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* Calculate and store information about how many rows are to be displayed
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* in the scrolling viewport, based on current dimensions in the browser's
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* rendering. This can be particularly useful if the table is initially
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* drawn in a hidden element - for example in a tab.
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* @param {bool} [bRedraw=true] Redraw the table automatically after the recalculation, with
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* the new dimensions forming the basis for the draw.
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* @returns {void}
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* @example
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* $(document).ready(function() {
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* // Make the example container hidden to throw off the browser's sizing
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* document.getElementById('container').style.display = "none";
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* var oTable = $('#example').dataTable( {
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* "sScrollY": "200px",
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* "sAjaxSource": "media/dataset/large.txt",
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* "sDom": "frtiS",
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* "bDeferRender": true,
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* "fnInitComplete": function (o) {
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* // Immediately scroll to row 1000
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* o.oScroller.fnScrollToRow( 1000 );
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* }
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* } );
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*
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* setTimeout( function () {
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* // Make the example container visible and recalculate the scroller sizes
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* document.getElementById('container').style.display = "block";
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* oTable.fnSettings().oScroller.fnMeasure();
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* }, 3000 );
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*/
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"fnMeasure": function ( bRedraw )
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{
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if ( this.s.autoHeight )
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{
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this._fnCalcRowHeight();
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}
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var heights = this.s.heights;
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if ( heights.row ) {
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heights.viewport = $(this.dom.scroller).height();
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this.s.viewportRows = parseInt( heights.viewport / heights.row, 10 )+1;
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this.s.dt._iDisplayLength = this.s.viewportRows * this.s.displayBuffer;
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}
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if ( bRedraw === undefined || bRedraw )
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{
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this.s.dt.oInstance.fnDraw( false );
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}
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},
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|
|
|
|
|
/**
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* Get information about current displayed record range. This corresponds to
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* the information usually displayed in the "Info" block of the table.
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*
|
|
* @returns {object} info as an object:
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* {
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* start: {int}, // the 0-indexed record at the top of the viewport
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* end: {int}, // the 0-indexed record at the bottom of the viewport
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* }
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*/
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"fnPageInfo": function()
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{
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var
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dt = this.s.dt,
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iScrollTop = this.dom.scroller.scrollTop,
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iTotal = dt.fnRecordsDisplay(),
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iPossibleEnd = Math.ceil(this.fnPixelsToRow(iScrollTop + this.s.heights.viewport, false, this.s.ani));
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return {
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start: Math.floor(this.fnPixelsToRow(iScrollTop, false, this.s.ani)),
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end: iTotal < iPossibleEnd ? iTotal-1 : iPossibleEnd-1
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};
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},
|
|
|
|
|
|
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
|
|
* Private methods (they are of course public in JS, but recommended as private)
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
|
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|
|
/**
|
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* Initialisation for Scroller
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
"_fnConstruct": function ()
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|
{
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var that = this;
|
|
|
|
/* Sanity check */
|
|
if ( !this.s.dt.oFeatures.bPaginate ) {
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this.s.dt.oApi._fnLog( this.s.dt, 0, 'Pagination must be enabled for Scroller' );
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return;
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|
}
|
|
|
|
/* Insert a div element that we can use to force the DT scrolling container to
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|
* the height that would be required if the whole table was being displayed
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|
*/
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this.dom.force.style.position = "relative";
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this.dom.force.style.top = "0px";
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|
this.dom.force.style.left = "0px";
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this.dom.force.style.width = "1px";
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this.dom.scroller = $('div.'+this.s.dt.oClasses.sScrollBody, this.s.dt.nTableWrapper)[0];
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this.dom.scroller.appendChild( this.dom.force );
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this.dom.scroller.style.position = "relative";
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this.dom.table = $('>table', this.dom.scroller)[0];
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this.dom.table.style.position = "absolute";
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this.dom.table.style.top = "0px";
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this.dom.table.style.left = "0px";
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|
|
|
// Add class to 'announce' that we are a Scroller table
|
|
$(this.s.dt.nTableWrapper).addClass('DTS');
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|
|
|
// Add a 'loading' indicator
|
|
if ( this.s.loadingIndicator )
|
|
{
|
|
this.dom.loader = $('<div class="dataTables_processing DTS_Loading">'+this.s.dt.oLanguage.sLoadingRecords+'</div>')
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|
.css('display', 'none');
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|
|
|
$(this.dom.scroller.parentNode)
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|
.css('position', 'relative')
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|
.append( this.dom.loader );
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|
}
|
|
|
|
/* Initial size calculations */
|
|
if ( this.s.heights.row && this.s.heights.row != 'auto' )
|
|
{
|
|
this.s.autoHeight = false;
|
|
}
|
|
this.fnMeasure( false );
|
|
|
|
/* Scrolling callback to see if a page change is needed - use a throttled
|
|
* function for the save save callback so we aren't hitting it on every
|
|
* scroll
|
|
*/
|
|
this.s.ingnoreScroll = true;
|
|
this.s.stateSaveThrottle = this.s.dt.oApi._fnThrottle( function () {
|
|
that.s.dt.oApi._fnSaveState( that.s.dt );
|
|
}, 500 );
|
|
$(this.dom.scroller).on( 'scroll.DTS', function (e) {
|
|
that._fnScroll.call( that );
|
|
} );
|
|
|
|
/* In iOS we catch the touchstart event in case the user tries to scroll
|
|
* while the display is already scrolling
|
|
*/
|
|
$(this.dom.scroller).on('touchstart.DTS', function () {
|
|
that._fnScroll.call( that );
|
|
} );
|
|
|
|
/* Update the scroller when the DataTable is redrawn */
|
|
this.s.dt.aoDrawCallback.push( {
|
|
"fn": function () {
|
|
if ( that.s.dt.bInitialised ) {
|
|
that._fnDrawCallback.call( that );
|
|
}
|
|
},
|
|
"sName": "Scroller"
|
|
} );
|
|
|
|
/* On resize, update the information element, since the number of rows shown might change */
|
|
$(window).on( 'resize.DTS', function () {
|
|
that.fnMeasure( false );
|
|
that._fnInfo();
|
|
} );
|
|
|
|
/* Add a state saving parameter to the DT state saving so we can restore the exact
|
|
* position of the scrolling
|
|
*/
|
|
var initialStateSave = true;
|
|
this.s.dt.oApi._fnCallbackReg( this.s.dt, 'aoStateSaveParams', function (oS, oData) {
|
|
/* Set iScroller to saved scroll position on initialization.
|
|
*/
|
|
if(initialStateSave && that.s.dt.oLoadedState){
|
|
oData.iScroller = that.s.dt.oLoadedState.iScroller;
|
|
oData.iScrollerTopRow = that.s.dt.oLoadedState.iScrollerTopRow;
|
|
initialStateSave = false;
|
|
} else {
|
|
oData.iScroller = that.dom.scroller.scrollTop;
|
|
oData.iScrollerTopRow = that.s.topRowFloat;
|
|
}
|
|
}, "Scroller_State" );
|
|
|
|
if ( this.s.dt.oLoadedState ) {
|
|
this.s.topRowFloat = this.s.dt.oLoadedState.iScrollerTopRow || 0;
|
|
}
|
|
|
|
// Measure immediately. Scroller will have been added using preInit, so
|
|
// we can reliably do this here. We could potentially also measure on
|
|
// init complete, which would be useful for cases where the data is Ajax
|
|
// loaded and longer than a single line.
|
|
$(this.s.dt.nTable).one( 'init.dt', function () {
|
|
that.fnMeasure();
|
|
} );
|
|
|
|
/* Destructor */
|
|
this.s.dt.aoDestroyCallback.push( {
|
|
"sName": "Scroller",
|
|
"fn": function () {
|
|
$(window).off( 'resize.DTS' );
|
|
$(that.dom.scroller).off('touchstart.DTS scroll.DTS');
|
|
$(that.s.dt.nTableWrapper).removeClass('DTS');
|
|
$('div.DTS_Loading', that.dom.scroller.parentNode).remove();
|
|
$(that.s.dt.nTable).off( 'init.dt' );
|
|
|
|
that.dom.table.style.position = "";
|
|
that.dom.table.style.top = "";
|
|
that.dom.table.style.left = "";
|
|
}
|
|
} );
|
|
},
|
|
|
|
|
|
/**
|
|
* Scrolling function - fired whenever the scrolling position is changed.
|
|
* This method needs to use the stored values to see if the table should be
|
|
* redrawn as we are moving towards the end of the information that is
|
|
* currently drawn or not. If needed, then it will redraw the table based on
|
|
* the new position.
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
"_fnScroll": function ()
|
|
{
|
|
var
|
|
that = this,
|
|
heights = this.s.heights,
|
|
iScrollTop = this.dom.scroller.scrollTop,
|
|
iTopRow;
|
|
|
|
if ( this.s.skip ) {
|
|
return;
|
|
}
|
|
|
|
if ( this.s.ingnoreScroll ) {
|
|
return;
|
|
}
|
|
|
|
/* If the table has been sorted or filtered, then we use the redraw that
|
|
* DataTables as done, rather than performing our own
|
|
*/
|
|
if ( this.s.dt.bFiltered || this.s.dt.bSorted ) {
|
|
this.s.lastScrollTop = 0;
|
|
return;
|
|
}
|
|
|
|
/* Update the table's information display for what is now in the viewport */
|
|
this._fnInfo();
|
|
|
|
/* We don't want to state save on every scroll event - that's heavy
|
|
* handed, so use a timeout to update the state saving only when the
|
|
* scrolling has finished
|
|
*/
|
|
clearTimeout( this.s.stateTO );
|
|
this.s.stateTO = setTimeout( function () {
|
|
that.s.dt.oApi._fnSaveState( that.s.dt );
|
|
}, 250 );
|
|
|
|
/* Check if the scroll point is outside the trigger boundary which would required
|
|
* a DataTables redraw
|
|
*/
|
|
if ( iScrollTop < this.s.redrawTop || iScrollTop > this.s.redrawBottom ) {
|
|
var preRows = Math.ceil( ((this.s.displayBuffer-1)/2) * this.s.viewportRows );
|
|
|
|
if ( Math.abs( iScrollTop - this.s.lastScrollTop ) > heights.viewport || this.s.ani ) {
|
|
iTopRow = parseInt(this._domain( 'physicalToVirtual', iScrollTop ) / heights.row, 10) - preRows;
|
|
this.s.topRowFloat = this._domain( 'physicalToVirtual', iScrollTop ) / heights.row;
|
|
}
|
|
else {
|
|
iTopRow = this.fnPixelsToRow( iScrollTop ) - preRows;
|
|
this.s.topRowFloat = this.fnPixelsToRow( iScrollTop, false );
|
|
}
|
|
|
|
if ( iTopRow <= 0 ) {
|
|
/* At the start of the table */
|
|
iTopRow = 0;
|
|
}
|
|
else if ( iTopRow + this.s.dt._iDisplayLength > this.s.dt.fnRecordsDisplay() ) {
|
|
/* At the end of the table */
|
|
iTopRow = this.s.dt.fnRecordsDisplay() - this.s.dt._iDisplayLength;
|
|
if ( iTopRow < 0 ) {
|
|
iTopRow = 0;
|
|
}
|
|
}
|
|
else if ( iTopRow % 2 !== 0 ) {
|
|
// For the row-striping classes (odd/even) we want only to start
|
|
// on evens otherwise the stripes will change between draws and
|
|
// look rubbish
|
|
iTopRow++;
|
|
}
|
|
|
|
if ( iTopRow != this.s.dt._iDisplayStart ) {
|
|
/* Cache the new table position for quick lookups */
|
|
this.s.tableTop = $(this.s.dt.nTable).offset().top;
|
|
this.s.tableBottom = $(this.s.dt.nTable).height() + this.s.tableTop;
|
|
|
|
var draw = function () {
|
|
if ( that.s.scrollDrawReq === null ) {
|
|
that.s.scrollDrawReq = iScrollTop;
|
|
}
|
|
|
|
that.s.dt._iDisplayStart = iTopRow;
|
|
that.s.dt.oApi._fnDraw( that.s.dt );
|
|
};
|
|
|
|
/* Do the DataTables redraw based on the calculated start point - note that when
|
|
* using server-side processing we introduce a small delay to not DoS the server...
|
|
*/
|
|
if ( this.s.dt.oFeatures.bServerSide ) {
|
|
clearTimeout( this.s.drawTO );
|
|
this.s.drawTO = setTimeout( draw, this.s.serverWait );
|
|
}
|
|
else {
|
|
draw();
|
|
}
|
|
|
|
if ( this.dom.loader && ! this.s.loaderVisible ) {
|
|
this.dom.loader.css( 'display', 'block' );
|
|
this.s.loaderVisible = true;
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
this.s.topRowFloat = this._domain( 'physicalToVirtual', iScrollTop ) / heights.row;
|
|
}
|
|
|
|
this.s.lastScrollTop = iScrollTop;
|
|
this.s.stateSaveThrottle();
|
|
},
|
|
|
|
|
|
/**
|
|
* Convert from one domain to another. The physical domain is the actual
|
|
* pixel count on the screen, while the virtual is if we had browsers which
|
|
* had scrolling containers of infinite height (i.e. the absolute value)
|
|
*
|
|
* @param {string} dir Domain transform direction, `virtualToPhysical` or
|
|
* `physicalToVirtual`
|
|
* @returns {number} Calculated transform
|
|
* @private
|
|
*/
|
|
_domain: function ( dir, val )
|
|
{
|
|
var heights = this.s.heights;
|
|
var coeff;
|
|
|
|
// If the virtual and physical height match, then we use a linear
|
|
// transform between the two, allowing the scrollbar to be linear
|
|
if ( heights.virtual === heights.scroll ) {
|
|
return val;
|
|
}
|
|
|
|
// Otherwise, we want a non-linear scrollbar to take account of the
|
|
// redrawing regions at the start and end of the table, otherwise these
|
|
// can stutter badly - on large tables 30px (for example) scroll might
|
|
// be hundreds of rows, so the table would be redrawing every few px at
|
|
// the start and end. Use a simple quadratic to stop this. It does mean
|
|
// the scrollbar is non-linear, but with such massive data sets, the
|
|
// scrollbar is going to be a best guess anyway
|
|
var xMax = (heights.scroll - heights.viewport) / 2;
|
|
var yMax = (heights.virtual - heights.viewport) / 2;
|
|
|
|
coeff = yMax / ( xMax * xMax );
|
|
|
|
if ( dir === 'virtualToPhysical' ) {
|
|
if ( val < yMax ) {
|
|
return Math.pow(val / coeff, 0.5);
|
|
}
|
|
else {
|
|
val = (yMax*2) - val;
|
|
return val < 0 ?
|
|
heights.scroll :
|
|
(xMax*2) - Math.pow(val / coeff, 0.5);
|
|
}
|
|
}
|
|
else if ( dir === 'physicalToVirtual' ) {
|
|
if ( val < xMax ) {
|
|
return val * val * coeff;
|
|
}
|
|
else {
|
|
val = (xMax*2) - val;
|
|
return val < 0 ?
|
|
heights.virtual :
|
|
(yMax*2) - (val * val * coeff);
|
|
}
|
|
}
|
|
},
|
|
|
|
|
|
/**
|
|
* Draw callback function which is fired when the DataTable is redrawn. The main function of
|
|
* this method is to position the drawn table correctly the scrolling container for the rows
|
|
* that is displays as a result of the scrolling position.
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
"_fnDrawCallback": function ()
|
|
{
|
|
var
|
|
that = this,
|
|
heights = this.s.heights,
|
|
iScrollTop = this.dom.scroller.scrollTop,
|
|
iActualScrollTop = iScrollTop,
|
|
iScrollBottom = iScrollTop + heights.viewport,
|
|
iTableHeight = $(this.s.dt.nTable).height(),
|
|
displayStart = this.s.dt._iDisplayStart,
|
|
displayLen = this.s.dt._iDisplayLength,
|
|
displayEnd = this.s.dt.fnRecordsDisplay();
|
|
|
|
// Disable the scroll event listener while we are updating the DOM
|
|
this.s.skip = true;
|
|
|
|
// Resize the scroll forcing element
|
|
this._fnScrollForce();
|
|
|
|
// Reposition the scrolling for the updated virtual position if needed
|
|
if ( displayStart === 0 ) {
|
|
// Linear calculation at the top of the table
|
|
iScrollTop = this.s.topRowFloat * heights.row;
|
|
}
|
|
else if ( displayStart + displayLen >= displayEnd ) {
|
|
// Linear calculation that the bottom as well
|
|
iScrollTop = heights.scroll - ((displayEnd - this.s.topRowFloat) * heights.row);
|
|
}
|
|
else {
|
|
// Domain scaled in the middle
|
|
iScrollTop = this._domain( 'virtualToPhysical', this.s.topRowFloat * heights.row );
|
|
}
|
|
|
|
this.dom.scroller.scrollTop = iScrollTop;
|
|
|
|
// Store positional information so positional calculations can be based
|
|
// upon the current table draw position
|
|
this.s.baseScrollTop = iScrollTop;
|
|
this.s.baseRowTop = this.s.topRowFloat;
|
|
|
|
// Position the table in the virtual scroller
|
|
var tableTop = iScrollTop - ((this.s.topRowFloat - displayStart) * heights.row);
|
|
if ( displayStart === 0 ) {
|
|
tableTop = 0;
|
|
}
|
|
else if ( displayStart + displayLen >= displayEnd ) {
|
|
tableTop = heights.scroll - iTableHeight;
|
|
}
|
|
|
|
this.dom.table.style.top = tableTop+'px';
|
|
|
|
/* Cache some information for the scroller */
|
|
this.s.tableTop = tableTop;
|
|
this.s.tableBottom = iTableHeight + this.s.tableTop;
|
|
|
|
// Calculate the boundaries for where a redraw will be triggered by the
|
|
// scroll event listener
|
|
var boundaryPx = (iScrollTop - this.s.tableTop) * this.s.boundaryScale;
|
|
this.s.redrawTop = iScrollTop - boundaryPx;
|
|
this.s.redrawBottom = iScrollTop + boundaryPx;
|
|
|
|
this.s.skip = false;
|
|
|
|
// Restore the scrolling position that was saved by DataTable's state
|
|
// saving Note that this is done on the second draw when data is Ajax
|
|
// sourced, and the first draw when DOM soured
|
|
if ( this.s.dt.oFeatures.bStateSave && this.s.dt.oLoadedState !== null &&
|
|
typeof this.s.dt.oLoadedState.iScroller != 'undefined' )
|
|
{
|
|
// A quirk of DataTables is that the draw callback will occur on an
|
|
// empty set if Ajax sourced, but not if server-side processing.
|
|
var ajaxSourced = (this.s.dt.sAjaxSource || that.s.dt.ajax) && ! this.s.dt.oFeatures.bServerSide ?
|
|
true :
|
|
false;
|
|
|
|
if ( ( ajaxSourced && this.s.dt.iDraw == 2) ||
|
|
(!ajaxSourced && this.s.dt.iDraw == 1) )
|
|
{
|
|
setTimeout( function () {
|
|
$(that.dom.scroller).scrollTop( that.s.dt.oLoadedState.iScroller );
|
|
that.s.redrawTop = that.s.dt.oLoadedState.iScroller - (heights.viewport/2);
|
|
|
|
// In order to prevent layout thrashing we need another
|
|
// small delay
|
|
setTimeout( function () {
|
|
that.s.ingnoreScroll = false;
|
|
}, 0 );
|
|
}, 0 );
|
|
}
|
|
}
|
|
else {
|
|
that.s.ingnoreScroll = false;
|
|
}
|
|
|
|
// Because of the order of the DT callbacks, the info update will
|
|
// take precedence over the one we want here. So a 'thread' break is
|
|
// needed. Only add the thread break if bInfo is set
|
|
if ( this.s.dt.oFeatures.bInfo ) {
|
|
setTimeout( function () {
|
|
that._fnInfo.call( that );
|
|
}, 0 );
|
|
}
|
|
|
|
// Hide the loading indicator
|
|
if ( this.dom.loader && this.s.loaderVisible ) {
|
|
this.dom.loader.css( 'display', 'none' );
|
|
this.s.loaderVisible = false;
|
|
}
|
|
},
|
|
|
|
|
|
/**
|
|
* Force the scrolling container to have height beyond that of just the
|
|
* table that has been drawn so the user can scroll the whole data set.
|
|
*
|
|
* Note that if the calculated required scrolling height exceeds a maximum
|
|
* value (1 million pixels - hard-coded) the forcing element will be set
|
|
* only to that maximum value and virtual / physical domain transforms will
|
|
* be used to allow Scroller to display tables of any number of records.
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
_fnScrollForce: function ()
|
|
{
|
|
var heights = this.s.heights;
|
|
var max = 1000000;
|
|
|
|
heights.virtual = heights.row * this.s.dt.fnRecordsDisplay();
|
|
heights.scroll = heights.virtual;
|
|
|
|
if ( heights.scroll > max ) {
|
|
heights.scroll = max;
|
|
}
|
|
|
|
// Minimum height so there is always a row visible (the 'no rows found'
|
|
// if reduced to zero filtering)
|
|
this.dom.force.style.height = heights.scroll > this.s.heights.row ?
|
|
heights.scroll+'px' :
|
|
this.s.heights.row+'px';
|
|
},
|
|
|
|
|
|
/**
|
|
* Automatic calculation of table row height. This is just a little tricky here as using
|
|
* initialisation DataTables has tale the table out of the document, so we need to create
|
|
* a new table and insert it into the document, calculate the row height and then whip the
|
|
* table out.
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
"_fnCalcRowHeight": function ()
|
|
{
|
|
var dt = this.s.dt;
|
|
var origTable = dt.nTable;
|
|
var nTable = origTable.cloneNode( false );
|
|
var tbody = $('<tbody/>').appendTo( nTable );
|
|
var container = $(
|
|
'<div class="'+dt.oClasses.sWrapper+' DTS">'+
|
|
'<div class="'+dt.oClasses.sScrollWrapper+'">'+
|
|
'<div class="'+dt.oClasses.sScrollBody+'"></div>'+
|
|
'</div>'+
|
|
'</div>'
|
|
);
|
|
|
|
// Want 3 rows in the sizing table so :first-child and :last-child
|
|
// CSS styles don't come into play - take the size of the middle row
|
|
$('tbody tr:lt(4)', origTable).clone().appendTo( tbody );
|
|
while( $('tr', tbody).length < 3 ) {
|
|
tbody.append( '<tr><td> </td></tr>' );
|
|
}
|
|
|
|
$('div.'+dt.oClasses.sScrollBody, container).append( nTable );
|
|
|
|
// If initialised using `dom`, use the holding element as the insert point
|
|
var insertEl = this.s.dt.nHolding || origTable.parentNode;
|
|
|
|
if ( ! $(insertEl).is(':visible') ) {
|
|
insertEl = 'body';
|
|
}
|
|
|
|
container.appendTo( insertEl );
|
|
this.s.heights.row = $('tr', tbody).eq(1).outerHeight();
|
|
|
|
container.remove();
|
|
},
|
|
|
|
|
|
/**
|
|
* Update any information elements that are controlled by the DataTable based on the scrolling
|
|
* viewport and what rows are visible in it. This function basically acts in the same way as
|
|
* _fnUpdateInfo in DataTables, and effectively replaces that function.
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
"_fnInfo": function ()
|
|
{
|
|
if ( !this.s.dt.oFeatures.bInfo )
|
|
{
|
|
return;
|
|
}
|
|
|
|
var
|
|
dt = this.s.dt,
|
|
language = dt.oLanguage,
|
|
iScrollTop = this.dom.scroller.scrollTop,
|
|
iStart = Math.floor( this.fnPixelsToRow(iScrollTop, false, this.s.ani)+1 ),
|
|
iMax = dt.fnRecordsTotal(),
|
|
iTotal = dt.fnRecordsDisplay(),
|
|
iPossibleEnd = Math.ceil( this.fnPixelsToRow(iScrollTop+this.s.heights.viewport, false, this.s.ani) ),
|
|
iEnd = iTotal < iPossibleEnd ? iTotal : iPossibleEnd,
|
|
sStart = dt.fnFormatNumber( iStart ),
|
|
sEnd = dt.fnFormatNumber( iEnd ),
|
|
sMax = dt.fnFormatNumber( iMax ),
|
|
sTotal = dt.fnFormatNumber( iTotal ),
|
|
sOut;
|
|
|
|
if ( dt.fnRecordsDisplay() === 0 &&
|
|
dt.fnRecordsDisplay() == dt.fnRecordsTotal() )
|
|
{
|
|
/* Empty record set */
|
|
sOut = language.sInfoEmpty+ language.sInfoPostFix;
|
|
}
|
|
else if ( dt.fnRecordsDisplay() === 0 )
|
|
{
|
|
/* Empty record set after filtering */
|
|
sOut = language.sInfoEmpty +' '+
|
|
language.sInfoFiltered.replace('_MAX_', sMax)+
|
|
language.sInfoPostFix;
|
|
}
|
|
else if ( dt.fnRecordsDisplay() == dt.fnRecordsTotal() )
|
|
{
|
|
/* Normal record set */
|
|
sOut = language.sInfo.
|
|
replace('_START_', sStart).
|
|
replace('_END_', sEnd).
|
|
replace('_MAX_', sMax).
|
|
replace('_TOTAL_', sTotal)+
|
|
language.sInfoPostFix;
|
|
}
|
|
else
|
|
{
|
|
/* Record set after filtering */
|
|
sOut = language.sInfo.
|
|
replace('_START_', sStart).
|
|
replace('_END_', sEnd).
|
|
replace('_MAX_', sMax).
|
|
replace('_TOTAL_', sTotal) +' '+
|
|
language.sInfoFiltered.replace(
|
|
'_MAX_',
|
|
dt.fnFormatNumber(dt.fnRecordsTotal())
|
|
)+
|
|
language.sInfoPostFix;
|
|
}
|
|
|
|
var callback = language.fnInfoCallback;
|
|
if ( callback ) {
|
|
sOut = callback.call( dt.oInstance,
|
|
dt, iStart, iEnd, iMax, iTotal, sOut
|
|
);
|
|
}
|
|
|
|
var n = dt.aanFeatures.i;
|
|
if ( typeof n != 'undefined' )
|
|
{
|
|
for ( var i=0, iLen=n.length ; i<iLen ; i++ )
|
|
{
|
|
$(n[i]).html( sOut );
|
|
}
|
|
}
|
|
|
|
// DT doesn't actually (yet) trigger this event, but it will in future
|
|
$(dt.nTable).triggerHandler( 'info.dt' );
|
|
}
|
|
} );
|
|
|
|
|
|
|
|
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
|
|
* Statics
|
|
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
|
|
|
|
|
|
/**
|
|
* Scroller default settings for initialisation
|
|
* @namespace
|
|
* @name Scroller.defaults
|
|
* @static
|
|
*/
|
|
Scroller.defaults = /** @lends Scroller.defaults */{
|
|
/**
|
|
* Indicate if Scroller show show trace information on the console or not. This can be
|
|
* useful when debugging Scroller or if just curious as to what it is doing, but should
|
|
* be turned off for production.
|
|
* @type bool
|
|
* @default false
|
|
* @static
|
|
* @example
|
|
* var oTable = $('#example').dataTable( {
|
|
* "sScrollY": "200px",
|
|
* "sDom": "frtiS",
|
|
* "bDeferRender": true,
|
|
* "oScroller": {
|
|
* "trace": true
|
|
* }
|
|
* } );
|
|
*/
|
|
"trace": false,
|
|
|
|
/**
|
|
* Scroller will attempt to automatically calculate the height of rows for it's internal
|
|
* calculations. However the height that is used can be overridden using this parameter.
|
|
* @type int|string
|
|
* @default auto
|
|
* @static
|
|
* @example
|
|
* var oTable = $('#example').dataTable( {
|
|
* "sScrollY": "200px",
|
|
* "sDom": "frtiS",
|
|
* "bDeferRender": true,
|
|
* "oScroller": {
|
|
* "rowHeight": 30
|
|
* }
|
|
* } );
|
|
*/
|
|
"rowHeight": "auto",
|
|
|
|
/**
|
|
* When using server-side processing, Scroller will wait a small amount of time to allow
|
|
* the scrolling to finish before requesting more data from the server. This prevents
|
|
* you from DoSing your own server! The wait time can be configured by this parameter.
|
|
* @type int
|
|
* @default 200
|
|
* @static
|
|
* @example
|
|
* var oTable = $('#example').dataTable( {
|
|
* "sScrollY": "200px",
|
|
* "sDom": "frtiS",
|
|
* "bDeferRender": true,
|
|
* "oScroller": {
|
|
* "serverWait": 100
|
|
* }
|
|
* } );
|
|
*/
|
|
"serverWait": 200,
|
|
|
|
/**
|
|
* The display buffer is what Scroller uses to calculate how many rows it should pre-fetch
|
|
* for scrolling. Scroller automatically adjusts DataTables' display length to pre-fetch
|
|
* rows that will be shown in "near scrolling" (i.e. just beyond the current display area).
|
|
* The value is based upon the number of rows that can be displayed in the viewport (i.e.
|
|
* a value of 1), and will apply the display range to records before before and after the
|
|
* current viewport - i.e. a factor of 3 will allow Scroller to pre-fetch 1 viewport's worth
|
|
* of rows before the current viewport, the current viewport's rows and 1 viewport's worth
|
|
* of rows after the current viewport. Adjusting this value can be useful for ensuring
|
|
* smooth scrolling based on your data set.
|
|
* @type int
|
|
* @default 7
|
|
* @static
|
|
* @example
|
|
* var oTable = $('#example').dataTable( {
|
|
* "sScrollY": "200px",
|
|
* "sDom": "frtiS",
|
|
* "bDeferRender": true,
|
|
* "oScroller": {
|
|
* "displayBuffer": 10
|
|
* }
|
|
* } );
|
|
*/
|
|
"displayBuffer": 9,
|
|
|
|
/**
|
|
* Scroller uses the boundary scaling factor to decide when to redraw the table - which it
|
|
* typically does before you reach the end of the currently loaded data set (in order to
|
|
* allow the data to look continuous to a user scrolling through the data). If given as 0
|
|
* then the table will be redrawn whenever the viewport is scrolled, while 1 would not
|
|
* redraw the table until the currently loaded data has all been shown. You will want
|
|
* something in the middle - the default factor of 0.5 is usually suitable.
|
|
* @type float
|
|
* @default 0.5
|
|
* @static
|
|
* @example
|
|
* var oTable = $('#example').dataTable( {
|
|
* "sScrollY": "200px",
|
|
* "sDom": "frtiS",
|
|
* "bDeferRender": true,
|
|
* "oScroller": {
|
|
* "boundaryScale": 0.75
|
|
* }
|
|
* } );
|
|
*/
|
|
"boundaryScale": 0.5,
|
|
|
|
/**
|
|
* Show (or not) the loading element in the background of the table. Note that you should
|
|
* include the dataTables.scroller.css file for this to be displayed correctly.
|
|
* @type boolean
|
|
* @default false
|
|
* @static
|
|
* @example
|
|
* var oTable = $('#example').dataTable( {
|
|
* "sScrollY": "200px",
|
|
* "sDom": "frtiS",
|
|
* "bDeferRender": true,
|
|
* "oScroller": {
|
|
* "loadingIndicator": true
|
|
* }
|
|
* } );
|
|
*/
|
|
"loadingIndicator": false
|
|
};
|
|
|
|
Scroller.oDefaults = Scroller.defaults;
|
|
|
|
|
|
|
|
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
|
|
* Constants
|
|
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
|
|
|
|
/**
|
|
* Scroller version
|
|
* @type String
|
|
* @default See code
|
|
* @name Scroller.version
|
|
* @static
|
|
*/
|
|
Scroller.version = "1.4.2";
|
|
|
|
|
|
|
|
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
|
|
* Initialisation
|
|
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
|
|
|
|
// Legacy `dom` parameter initialisation support
|
|
if ( typeof $.fn.dataTable == "function" &&
|
|
typeof $.fn.dataTableExt.fnVersionCheck == "function" &&
|
|
$.fn.dataTableExt.fnVersionCheck('1.10.0') )
|
|
{
|
|
$.fn.dataTableExt.aoFeatures.push( {
|
|
"fnInit": function( oDTSettings ) {
|
|
var init = oDTSettings.oInit;
|
|
var opts = init.scroller || init.oScroller || {};
|
|
|
|
new Scroller( oDTSettings, opts );
|
|
},
|
|
"cFeature": "S",
|
|
"sFeature": "Scroller"
|
|
} );
|
|
}
|
|
else
|
|
{
|
|
alert( "Warning: Scroller requires DataTables 1.10.0 or greater - www.datatables.net/download");
|
|
}
|
|
|
|
// Attach a listener to the document which listens for DataTables initialisation
|
|
// events so we can automatically initialise
|
|
$(document).on( 'preInit.dt.dtscroller', function (e, settings) {
|
|
if ( e.namespace !== 'dt' ) {
|
|
return;
|
|
}
|
|
|
|
var init = settings.oInit.scroller;
|
|
var defaults = DataTable.defaults.scroller;
|
|
|
|
if ( init || defaults ) {
|
|
var opts = $.extend( {}, init, defaults );
|
|
|
|
if ( init !== false ) {
|
|
new Scroller( settings, opts );
|
|
}
|
|
}
|
|
} );
|
|
|
|
|
|
// Attach Scroller to DataTables so it can be accessed as an 'extra'
|
|
$.fn.dataTable.Scroller = Scroller;
|
|
$.fn.DataTable.Scroller = Scroller;
|
|
|
|
|
|
// DataTables 1.10 API method aliases
|
|
var Api = $.fn.dataTable.Api;
|
|
|
|
Api.register( 'scroller()', function () {
|
|
return this;
|
|
} );
|
|
|
|
// Undocumented and deprecated - is it actually useful at all?
|
|
Api.register( 'scroller().rowToPixels()', function ( rowIdx, intParse, virtual ) {
|
|
var ctx = this.context;
|
|
|
|
if ( ctx.length && ctx[0].oScroller ) {
|
|
return ctx[0].oScroller.fnRowToPixels( rowIdx, intParse, virtual );
|
|
}
|
|
// undefined
|
|
} );
|
|
|
|
// Undocumented and deprecated - is it actually useful at all?
|
|
Api.register( 'scroller().pixelsToRow()', function ( pixels, intParse, virtual ) {
|
|
var ctx = this.context;
|
|
|
|
if ( ctx.length && ctx[0].oScroller ) {
|
|
return ctx[0].oScroller.fnPixelsToRow( pixels, intParse, virtual );
|
|
}
|
|
// undefined
|
|
} );
|
|
|
|
// Undocumented and deprecated - use `row().scrollTo()` instead
|
|
Api.register( 'scroller().scrollToRow()', function ( row, ani ) {
|
|
this.iterator( 'table', function ( ctx ) {
|
|
if ( ctx.oScroller ) {
|
|
ctx.oScroller.fnScrollToRow( row, ani );
|
|
}
|
|
} );
|
|
|
|
return this;
|
|
} );
|
|
|
|
Api.register( 'row().scrollTo()', function ( ani ) {
|
|
var that = this;
|
|
|
|
this.iterator( 'row', function ( ctx, rowIdx ) {
|
|
if ( ctx.oScroller ) {
|
|
var displayIdx = that
|
|
.rows( { order: 'applied', search: 'applied' } )
|
|
.indexes()
|
|
.indexOf( rowIdx );
|
|
|
|
ctx.oScroller.fnScrollToRow( displayIdx, ani );
|
|
}
|
|
} );
|
|
|
|
return this;
|
|
} );
|
|
|
|
Api.register( 'scroller.measure()', function ( redraw ) {
|
|
this.iterator( 'table', function ( ctx ) {
|
|
if ( ctx.oScroller ) {
|
|
ctx.oScroller.fnMeasure( redraw );
|
|
}
|
|
} );
|
|
|
|
return this;
|
|
} );
|
|
|
|
Api.register( 'scroller.page()', function() {
|
|
var ctx = this.context;
|
|
|
|
if ( ctx.length && ctx[0].oScroller ) {
|
|
return ctx[0].oScroller.fnPageInfo();
|
|
}
|
|
// undefined
|
|
} );
|
|
|
|
return Scroller;
|
|
}));
|