mirror of https://github.com/ElemeFE/element
814 lines
22 KiB
Markdown
814 lines
22 KiB
Markdown
<style>
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.demo-tree {
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.leaf {
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width: 20px;
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background: #ddd;
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}
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.folder {
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width: 20px;
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background: #888;
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}
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.buttons {
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margin-top: 20px;
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}
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.filter-tree {
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margin-top: 20px;
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}
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}
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</style>
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<script>
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const data = [{
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label: '一级 1',
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children: [{
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label: '二级 1-1',
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children: [{
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label: '三级 1-1-1'
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}]
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}]
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}, {
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label: '一级 2',
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children: [{
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label: '二级 2-1',
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children: [{
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label: '三级 2-1-1'
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}]
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}, {
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label: '二级 2-2',
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children: [{
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label: '三级 2-2-1'
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}]
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}]
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}, {
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label: '一级 3',
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children: [{
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label: '二级 3-1',
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children: [{
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label: '三级 3-1-1'
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}]
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}, {
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label: '二级 3-2',
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children: [{
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label: '三级 3-2-1'
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}]
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}]
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}];
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const data2 = [{
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id: 1,
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label: '一级 1',
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children: [{
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id: 4,
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label: '二级 1-1',
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children: [{
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id: 9,
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label: '三级 1-1-1'
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}, {
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id: 10,
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label: '三级 1-1-2'
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}]
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}]
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}, {
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id: 2,
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label: '一级 2',
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children: [{
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id: 5,
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label: '二级 2-1'
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}, {
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id: 6,
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label: '二级 2-2'
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}]
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}, {
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id: 3,
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label: '一级 3',
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children: [{
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id: 7,
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label: '二级 3-1'
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}, {
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id: 8,
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label: '二级 3-2'
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}]
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}];
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let id = 1000;
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const regions = [{
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'name': 'region1'
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}, {
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'name': 'region2'
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}];
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let count = 1;
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const props = {
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label: 'name',
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children: 'zones'
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};
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const defaultProps = {
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children: 'children',
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label: 'label'
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};
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export default {
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watch: {
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filterText(val) {
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this.$refs.tree2.filter(val);
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}
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},
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methods: {
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handleCheckChange(data, checked, indeterminate) {
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console.log(data, checked, indeterminate);
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},
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handleNodeClick(data) {
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console.log(data);
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},
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loadNode(node, resolve) {
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if (node.level === 0) {
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return resolve([{ name: 'region1' }, { name: 'region2' }]);
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}
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if (node.level > 3) return resolve([]);
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var hasChild;
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if (node.data.name === 'region1') {
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hasChild = true;
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} else if (node.data.name === 'region2') {
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hasChild = false;
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} else {
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hasChild = Math.random() > 0.5;
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}
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setTimeout(function() {
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var data;
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if (hasChild) {
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data = [{
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name: 'zone' + count++
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}, {
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name: 'zone' + count++
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}];
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} else {
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data = [];
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}
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resolve(data);
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}, 500);
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},
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getCheckedNodes() {
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console.log(this.$refs.tree.getCheckedNodes());
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},
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getCheckedKeys() {
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console.log(this.$refs.tree.getCheckedKeys());
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},
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setCheckedNodes() {
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this.$refs.tree.setCheckedNodes([
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{
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id: 5,
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label: '二级 2-1'
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},
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{
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id: 9,
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label: '三级 1-1-1'
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}
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]);
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},
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setCheckedKeys() {
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this.$refs.tree.setCheckedKeys([3]);
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},
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resetChecked() {
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this.$refs.tree.setCheckedKeys([]);
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},
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append(store, data) {
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store.append({ id: id++, label: 'testtest', children: [] }, data);
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},
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remove(store, data) {
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store.remove(data);
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},
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renderContent(h, { node, data, store }) {
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return (
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<span>
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<span>
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<span>{node.label}</span>
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</span>
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<span style="float: right; margin-right: 20px">
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<el-button size="mini" on-click={ () => this.append(store, data) }>Append</el-button>
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<el-button size="mini" on-click={ () => this.remove(store, data) }>Delete</el-button>
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</span>
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</span>);
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},
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filterNode(value, data) {
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if (!value) return true;
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return data.label.indexOf(value) !== -1;
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}
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},
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data() {
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return {
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data,
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data2,
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regions,
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defaultProps,
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props,
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defaultCheckedKeys: [5],
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defaultExpandedKeys: [2, 3],
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filterText: ''
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};
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}
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};
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</script>
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## Tree 树形控件
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用清晰的层级结构展示信息，可展开或折叠。
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### 基础用法
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基础的树形结构展示。
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::: demo
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```html
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<el-tree :data="data" :props="defaultProps" @node-click="handleNodeClick"></el-tree>
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<script>
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export default {
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data() {
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return {
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data: [{
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label: '一级 1',
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children: [{
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label: '二级 1-1',
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children: [{
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label: '三级 1-1-1'
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}]
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}]
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}, {
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label: '一级 2',
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children: [{
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label: '二级 2-1',
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children: [{
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label: '三级 2-1-1'
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}]
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}, {
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label: '二级 2-2',
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children: [{
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label: '三级 2-2-1'
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}]
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}]
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}, {
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label: '一级 3',
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children: [{
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label: '二级 3-1',
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children: [{
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label: '三级 3-1-1'
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}]
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}, {
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label: '二级 3-2',
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children: [{
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label: '三级 3-2-1'
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}]
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}]
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}],
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defaultProps: {
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children: 'children',
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label: 'label'
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}
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};
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},
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methods: {
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handleNodeClick(data) {
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console.log(data);
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}
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}
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};
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</script>
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```
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:::
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### 可选择
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适用于需要选择层级时使用。在下例中，由于在点击时才进行该层数据的获取，导致层级不可预知，如果没有下层数据，则点击后下拉按钮会消失。
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::: demo
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```html
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<el-tree
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:data="regions"
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:props="props"
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:load="loadNode"
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lazy
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show-checkbox
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@check-change="handleCheckChange">
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</el-tree>
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<script>
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export default {
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data() {
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return {
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regions: [{
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'name': 'region1'
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}, {
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'name': 'region2'
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}],
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props: {
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label: 'name',
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children: 'zones'
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},
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count: 1
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};
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},
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methods: {
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handleCheckChange(data, checked, indeterminate) {
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console.log(data, checked, indeterminate);
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},
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handleNodeClick(data) {
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console.log(data);
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},
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loadNode(node, resolve) {
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if (node.level === 0) {
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return resolve([{ name: 'region1' }, { name: 'region2' }]);
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}
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if (node.level > 3) return resolve([]);
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var hasChild;
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if (node.data.name === 'region1') {
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hasChild = true;
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} else if (node.data.name === 'region2') {
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hasChild = false;
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} else {
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hasChild = Math.random() > 0.5;
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}
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setTimeout(() => {
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var data;
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if (hasChild) {
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data = [{
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name: 'zone' + this.count++
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}, {
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name: 'zone' + this.count++
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}];
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} else {
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data = [];
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}
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resolve(data);
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}, 500);
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}
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}
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};
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</script>
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```
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:::
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### 默认展开和默认选中
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可将 Tree 的某些节点设置为默认展开或默认选中
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::: demo 分别通过`default-expanded-keys`和`default-checked-keys`设置默认展开和默认选中的节点。需要注意的是，此时必须设置`node-key`，其值为节点数据中的一个字段名，该字段在整棵树中是唯一的。
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```html
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<el-tree
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:data="data2"
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show-checkbox
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node-key="id"
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:default-expanded-keys="[2, 3]"
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:default-checked-keys="[5]"
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:props="defaultProps">
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</el-tree>
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<script>
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export default {
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data() {
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return {
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data2: [{
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id: 1,
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label: '一级 1',
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children: [{
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id: 4,
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label: '二级 1-1',
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children: [{
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id: 9,
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label: '三级 1-1-1'
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}, {
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id: 10,
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label: '三级 1-1-2'
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}]
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}]
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}, {
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id: 2,
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label: '一级 2',
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children: [{
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id: 5,
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label: '二级 2-1'
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}, {
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id: 6,
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label: '二级 2-2'
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}]
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}, {
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id: 3,
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label: '一级 3',
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children: [{
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id: 7,
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label: '二级 3-1'
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}, {
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id: 8,
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label: '二级 3-2'
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}]
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}],
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defaultProps: {
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children: 'children',
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label: 'label'
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}
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};
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}
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};
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</script>
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```
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:::
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### 树节点的选择
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::: demo 本例展示如何获取和设置选中节点。获取和设置各有两种方式：通过 node 或通过 key。如果需要通过 key 来获取或设置，则必须设置`node-key`。
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```html
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<el-tree
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:data="data2"
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show-checkbox
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default-expand-all
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node-key="id"
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ref="tree"
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highlight-current
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:props="defaultProps">
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</el-tree>
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<div class="buttons">
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<el-button @click="getCheckedNodes">通过 node 获取</el-button>
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<el-button @click="getCheckedKeys">通过 key 获取</el-button>
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<el-button @click="setCheckedNodes">通过 node 设置</el-button>
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<el-button @click="setCheckedKeys">通过 key 设置</el-button>
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<el-button @click="resetChecked">清空</el-button>
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</div>
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<script>
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export default {
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methods: {
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getCheckedNodes() {
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console.log(this.$refs.tree.getCheckedNodes());
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},
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getCheckedKeys() {
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console.log(this.$refs.tree.getCheckedKeys());
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},
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setCheckedNodes() {
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this.$refs.tree.setCheckedNodes([{
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id: 5,
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label: '二级 2-1'
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}, {
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id: 9,
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label: '三级 1-1-1'
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}]);
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},
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setCheckedKeys() {
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this.$refs.tree.setCheckedKeys([3]);
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},
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resetChecked() {
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this.$refs.tree.setCheckedKeys([]);
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}
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},
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data() {
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return {
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data2: [{
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id: 1,
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label: '一级 1',
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children: [{
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id: 4,
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label: '二级 1-1',
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children: [{
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id: 9,
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label: '三级 1-1-1'
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}, {
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id: 10,
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label: '三级 1-1-2'
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}]
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}]
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}, {
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id: 2,
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label: '一级 2',
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children: [{
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id: 5,
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label: '二级 2-1'
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}, {
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id: 6,
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label: '二级 2-2'
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}]
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}, {
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id: 3,
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label: '一级 3',
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children: [{
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id: 7,
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label: '二级 3-1'
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}, {
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id: 8,
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label: '二级 3-2'
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}]
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}],
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defaultProps: {
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children: 'children',
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label: 'label'
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}
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};
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}
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};
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</script>
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```
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:::
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### 自定义节点内容
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节点的内容支持自定义，可以在节点区添加按钮或图标等内容
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::: demo 使用`render-content`指定渲染函数，该函数返回需要的节点区内容即可。渲染函数的用法请参考 Vue 文档。
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```html
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<el-tree
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:data="data2"
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:props="defaultProps"
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show-checkbox
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node-key="id"
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default-expand-all
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:expand-on-click-node="false"
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:render-content="renderContent">
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</el-tree>
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<script>
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let id = 1000;
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export default {
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data() {
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return {
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data2: [{
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id: 1,
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label: '一级 1',
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children: [{
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id: 4,
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label: '二级 1-1',
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children: [{
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id: 9,
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label: '三级 1-1-1'
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}, {
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id: 10,
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label: '三级 1-1-2'
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}]
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}]
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}, {
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id: 2,
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label: '一级 2',
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children: [{
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id: 5,
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label: '二级 2-1'
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}, {
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id: 6,
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label: '二级 2-2'
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}]
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}, {
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id: 3,
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label: '一级 3',
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children: [{
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id: 7,
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label: '二级 3-1'
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}, {
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id: 8,
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label: '二级 3-2'
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}]
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}],
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defaultProps: {
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children: 'children',
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label: 'label'
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}
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}
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},
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methods: {
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append(store, data) {
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store.append({ id: id++, label: 'testtest', children: [] }, data);
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},
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remove(store, data) {
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store.remove(data);
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},
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renderContent(h, { node, data, store }) {
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return (
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<span>
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<span>
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<span>{node.label}</span>
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</span>
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<span style="float: right; margin-right: 20px">
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<el-button size="mini" on-click={ () => this.append(store, data) }>Append</el-button>
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<el-button size="mini" on-click={ () => this.remove(store, data) }>Delete</el-button>
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</span>
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</span>);
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}
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}
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};
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</script>
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```
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:::
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### 节点过滤
|
||
通过关键字过滤树节点
|
||
|
||
::: demo 在需要对节点进行过滤时，调用 Tree 实例的`filter`方法，参数为关键字。需要注意的是，此时需要设置`filter-node-method`，值为过滤函数。
|
||
```html
|
||
<el-input
|
||
placeholder="输入关键字进行过滤"
|
||
v-model="filterText">
|
||
</el-input>
|
||
|
||
<el-tree
|
||
class="filter-tree"
|
||
:data="data2"
|
||
:props="defaultProps"
|
||
default-expand-all
|
||
:filter-node-method="filterNode"
|
||
ref="tree2">
|
||
</el-tree>
|
||
|
||
<script>
|
||
export default {
|
||
watch: {
|
||
filterText(val) {
|
||
this.$refs.tree2.filter(val);
|
||
}
|
||
},
|
||
|
||
methods: {
|
||
filterNode(value, data) {
|
||
if (!value) return true;
|
||
return data.label.indexOf(value) !== -1;
|
||
}
|
||
},
|
||
|
||
data() {
|
||
return {
|
||
filterText: '',
|
||
data2: [{
|
||
id: 1,
|
||
label: '一级 1',
|
||
children: [{
|
||
id: 4,
|
||
label: '二级 1-1',
|
||
children: [{
|
||
id: 9,
|
||
label: '三级 1-1-1'
|
||
}, {
|
||
id: 10,
|
||
label: '三级 1-1-2'
|
||
}]
|
||
}]
|
||
}, {
|
||
id: 2,
|
||
label: '一级 2',
|
||
children: [{
|
||
id: 5,
|
||
label: '二级 2-1'
|
||
}, {
|
||
id: 6,
|
||
label: '二级 2-2'
|
||
}]
|
||
}, {
|
||
id: 3,
|
||
label: '一级 3',
|
||
children: [{
|
||
id: 7,
|
||
label: '二级 3-1'
|
||
}, {
|
||
id: 8,
|
||
label: '二级 3-2'
|
||
}]
|
||
}],
|
||
defaultProps: {
|
||
children: 'children',
|
||
label: 'label'
|
||
}
|
||
};
|
||
}
|
||
};
|
||
</script>
|
||
```
|
||
:::
|
||
|
||
### 手风琴模式
|
||
|
||
每次只打开一个同级树节点展开
|
||
|
||
::: demo
|
||
```html
|
||
<el-tree
|
||
:data="data"
|
||
:props="defaultProps"
|
||
accordion
|
||
@node-click="handleNodeClick">
|
||
</el-tree>
|
||
|
||
<script>
|
||
export default {
|
||
data() {
|
||
return {
|
||
data: [{
|
||
label: '一级 1',
|
||
children: [{
|
||
label: '二级 1-1',
|
||
children: [{
|
||
label: '三级 1-1-1'
|
||
}]
|
||
}]
|
||
}, {
|
||
label: '一级 2',
|
||
children: [{
|
||
label: '二级 2-1',
|
||
children: [{
|
||
label: '三级 2-1-1'
|
||
}]
|
||
}, {
|
||
label: '二级 2-2',
|
||
children: [{
|
||
label: '三级 2-2-1'
|
||
}]
|
||
}]
|
||
}, {
|
||
label: '一级 3',
|
||
children: [{
|
||
label: '二级 3-1',
|
||
children: [{
|
||
label: '三级 3-1-1'
|
||
}]
|
||
}, {
|
||
label: '二级 3-2',
|
||
children: [{
|
||
label: '三级 3-2-1'
|
||
}]
|
||
}]
|
||
}],
|
||
defaultProps: {
|
||
children: 'children',
|
||
label: 'label'
|
||
}
|
||
};
|
||
},
|
||
methods: {
|
||
handleNodeClick(data) {
|
||
console.log(data);
|
||
}
|
||
}
|
||
};
|
||
</script>
|
||
```
|
||
:::
|
||
|
||
### Attributes
|
||
| 参数 | 说明 | 类型 | 可选值 | 默认值 |
|
||
| --------------------- | ---------------------------------------- | --------------------------- | ---- | ----- |
|
||
| data | 展示数据 | array | — | — |
|
||
| empty-text | 内容为空的时候展示的文本 | String | — | — |
|
||
| node-key | 每个树节点用来作为唯一标识的属性，整颗树应该是唯一的 | String | — | — |
|
||
| props | 配置选项，具体看下表 | object | — | — |
|
||
| load | 加载子树数据的方法 | function(node, resolve) | — | — |
|
||
| render-content | 树节点的内容区的渲染 Function | Function(h, { node } | — | — |
|
||
| highlight-current | 是否高亮当前选中节点，默认值是 false。 | boolean | — | false |
|
||
| current-node-key | 当前选中节点的 key，只写属性 | string, number | — | — |
|
||
| default-expand-all | 是否默认展开所有节点 | boolean | — | false |
|
||
| expand-on-click-node | 是否在点击节点的时候展开或者收缩节点， 默认值为 true，如果为 false，则只有点箭头图标的时候才会展开或者收缩节点。 | boolean | — | true |
|
||
| auto-expand-parent | 展开子节点的时候是否自动展开父节点 | boolean | — | true |
|
||
| default-expanded-keys | 默认展开的节点的 key 的数组 | array | — | — |
|
||
| show-checkbox | 节点是否可被选择 | boolean | — | false |
|
||
| check-strictly | 在显示复选框的情况下，是否严格的遵循父子不互相关联的做法，默认为 false | boolean | — | false |
|
||
| default-checked-keys | 默认勾选的节点的 key 的数组 | array | — | — |
|
||
| filter-node-method | 对树节点进行筛选时执行的方法，返回 true 表示这个节点可以显示，返回 false 则表示这个节点会被隐藏 | Function(value, data, node) | — | — |
|
||
| accordion | 是否每次只打开一个同级树节点展开 | boolean | — | false |
|
||
| indent | 相邻级节点间的水平缩进，单位为像素 | number | — | 16 |
|
||
|
||
### props
|
||
| 参数 | 说明 | 类型 | 可选值 | 默认值 |
|
||
| -------- | ----------------- | ------ | ---- | ---- |
|
||
| label | 指定节点标签为节点对象的某个属性值 | string | — | — |
|
||
| children | 指定子树为节点对象的某个属性值 | string | — | — |
|
||
|
||
### 方法
|
||
`Tree` 拥有如下方法，返回目前被选中的节点数组：
|
||
| 方法名 | 说明 | 参数 |
|
||
| --------------- | ---------------------------------------- | ---------------------------------------- |
|
||
| filter | 对树节点进行筛选操作 | 接收一个任意类型的参数，该参数会在 filter-node-method 中作为第一个参数 |
|
||
| getCheckedNodes | 若节点可被选择（即 `show-checkbox` 为 `true`），则返回目前被选中的节点所组成的数组 | (leafOnly) 接收一个 boolean 类型的参数，若为 `true` 则仅返回被选中的叶子节点，默认值为 `false` |
|
||
| setCheckedNodes | 设置目前勾选的节点，使用此方法必须设置 node-key 属性 | (nodes) 接收勾选节点数据的数组 |
|
||
| getCheckedKeys | 若节点可被选择（即 `show-checkbox` 为 `true`），则返回目前被选中的节点所组成的数组 | (leafOnly) 接收一个 boolean 类型的参数，若为 `true` 则仅返回被选中的叶子节点的 keys，默认值为 `false` |
|
||
| setCheckedKeys | 通过 keys 设置目前勾选的节点，使用此方法必须设置 node-key 属性 | (keys, leafOnly) 接收两个参数，1. 勾选节点的 key 的数组 2. boolean 类型的参数，若为 `true` 则仅设置叶子节点的选中状态，默认值为 `false` |
|
||
| setChecked | 通过 key / data 设置某个节点的勾选状态，使用此方法必须设置 node-key 属性 | (key/data, checked, deep) 接收三个参数，1. 勾选节点的 key 或者 data 2. boolean 类型，节点是否选中 3. boolean 类型，是否设置子节点 ，默认为 false |
|
||
|
||
### Events
|
||
| 事件名称 | 说明 | 回调参数 |
|
||
| -------------- | -------------- | ---------------------------------------- |
|
||
| node-click | 节点被点击时的回调 | 共三个参数，依次为：传递给 `data` 属性的数组中该节点所对应的对象、节点对应的 Node、节点组件本身。 |
|
||
| check-change | 节点选中状态发生变化时的回调 | 共三个参数，依次为：传递给 `data` 属性的数组中该节点所对应的对象、节点本身是否被选中、节点的子树中是否有被选中的节点 |
|
||
| current-change | 当前选中节点变化时触发的事件 | 共两个参数，依次为：当前节点的数据，当前节点的 Node 对象 |
|
||
| node-expand | 节点被展开时触发的事件 | 共三个参数，依次为：传递给 `data` 属性的数组中该节点所对应的对象、节点对应的 Node、节点组件本身。 |
|
||
| node-collapse | 节点被关闭时触发的事件 | 共三个参数，依次为：传递给 `data` 属性的数组中该节点所对应的对象、节点对应的 Node、节点组件本身。 |
|