mirror of https://github.com/ElemeFE/element
792 lines
22 KiB
Markdown
792 lines
22 KiB
Markdown
<script>
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const data = [{
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label: 'Level one 1',
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children: [{
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label: 'Level two 1-1',
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children: [{
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label: 'Level three 1-1-1'
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}]
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}]
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}, {
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label: 'Level one 2',
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children: [{
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label: 'Level two 2-1',
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children: [{
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label: 'Level three 2-1-1'
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}]
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}, {
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label: 'Level two 2-2',
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children: [{
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label: 'Level three 2-2-1'
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}]
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}]
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}, {
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label: 'Level one 3',
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children: [{
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label: 'Level two 3-1',
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children: [{
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label: 'Level three 3-1-1'
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}]
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}, {
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label: 'Level two 3-2',
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children: [{
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label: 'Level three 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: 'Level one 1',
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children: [{
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id: 4,
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label: 'Level two 1-1',
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children: [{
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id: 9,
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label: 'Level three 1-1-1'
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}, {
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id: 10,
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label: 'Level three 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: 'Level one 2',
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children: [{
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id: 5,
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label: 'Level two 2-1'
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}, {
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id: 6,
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label: 'Level two 2-2'
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}]
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}, {
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id: 3,
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label: 'Level one 3',
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children: [{
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id: 7,
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label: 'Level two 3-1'
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}, {
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id: 8,
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label: 'Level two 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: 'Root1' }, { name: 'Root2' }]);
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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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let 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
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Display a set of data with hierarchies.
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### Basic usage
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Basic tree structure.
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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: 'Level one 1',
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children: [{
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label: 'Level two 1-1',
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children: [{
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label: 'Level three 1-1-1'
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}]
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}]
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}, {
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label: 'Level one 2',
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children: [{
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label: 'Level two 2-1',
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children: [{
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label: 'Level three 2-1-1'
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}]
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}, {
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label: 'Level two 2-2',
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children: [{
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label: 'Level three 2-2-1'
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}]
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}]
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}, {
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label: 'Level one 3',
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children: [{
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label: 'Level two 3-1',
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children: [{
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label: 'Level three 3-1-1'
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}]
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}, {
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label: 'Level two 3-2',
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children: [{
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label: 'Level three 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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### Selectable
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Used for node selection. In the following example, data for each layer is acquired after being clicked. If there is no child data, the expanding icon will disappear.
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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: 'Root1' }, { name: 'Root2' }]);
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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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### Default expanded and default checked
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Tree nodes can be initially expanded or checked
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::: demo Use `default-expanded-keys` and `default-checked-keys` to set initially expanded and initially checked nodes respectively. Note that for them to work, `node-key` is required. Its value is the name of a key in the data object, and the value of that key should be unique across the whole tree.
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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: 'Level one 1',
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children: [{
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id: 4,
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label: 'Level two 1-1',
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children: [{
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id: 9,
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label: 'Level three 1-1-1'
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}, {
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id: 10,
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label: 'Level three 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: 'Level one 2',
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children: [{
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id: 5,
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label: 'Level two 2-1'
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}, {
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id: 6,
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label: 'Level two 2-2'
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}]
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}, {
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id: 3,
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label: 'Level one 3',
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children: [{
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id: 7,
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label: 'Level two 3-1'
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}, {
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id: 8,
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label: 'Level two 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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### Checking tree nodes
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::: demo This example shows how to get and set checked nodes. They both can be done in two approaches: node and key. If you are taking the key approach, `node-key` is required.
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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">get by node</el-button>
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<el-button @click="getCheckedKeys">get by key</el-button>
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<el-button @click="setCheckedNodes">set by node</el-button>
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<el-button @click="setCheckedKeys">set by key</el-button>
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<el-button @click="resetChecked">reset</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.$refs.tree.setCheckedNodes([{
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id: 5,
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label: 'Level two 2-1'
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}, {
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id: 9,
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label: 'Level three 1-1-1'
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}]);
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},
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setCheckedKeys() {
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this.$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: 'Level one 1',
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children: [{
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id: 4,
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label: 'Level two 1-1',
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children: [{
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id: 9,
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label: 'Level three 1-1-1'
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}, {
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id: 10,
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label: 'Level three 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: 'Level one 2',
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children: [{
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id: 5,
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label: 'Level two 2-1'
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}, {
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id: 6,
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label: 'Level two 2-2'
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}]
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}, {
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id: 3,
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label: 'Level one 3',
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children: [{
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id: 7,
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label: 'Level two 3-1'
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}, {
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id: 8,
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label: 'Level two 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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### Custom node content
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The content of tree nodes can be customized, so you can add icons or buttons as you will
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::: demo Use `render-content` to assign a render function that returns the content of tree nodes. See Vue's documentation for a detailed introduction of render functions.
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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: 'Level one 1',
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children: [{
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id: 4,
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label: 'Level two 1-1',
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children: [{
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id: 9,
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label: 'Level three 1-1-1'
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}, {
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id: 10,
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label: 'Level three 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: 'Level one 2',
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children: [{
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id: 5,
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label: 'Level two 2-1'
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}, {
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id: 6,
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label: 'Level two 2-2'
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}]
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}, {
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id: 3,
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label: 'Level one 3',
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children: [{
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id: 7,
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label: 'Level two 3-1'
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}, {
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id: 8,
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label: 'Level two 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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### Tree node filtering
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Tree nodes can be filtered
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::: demo Invoke the `filter` method of the Tree instance to filter tree nodes. Its parameter is the filtering keyword. Note that for it to work, `filter-node-method` is required, and its value is the filtering method.
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```html
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<el-input
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placeholder="Filter keyword"
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v-model="filterText">
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</el-input>
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<el-tree
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class="filter-tree"
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:data="data2"
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:props="defaultProps"
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default-expand-all
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:filter-node-method="filterNode"
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ref="tree2">
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</el-tree>
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|
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<script>
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|
export default {
|
|
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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|
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methods: {
|
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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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|
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data() {
|
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return {
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filterText: '',
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data2: [{
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id: 1,
|
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label: 'Level one 1',
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children: [{
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id: 4,
|
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label: 'Level two 1-1',
|
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children: [{
|
|
id: 9,
|
|
label: 'Level three 1-1-1'
|
|
}, {
|
|
id: 10,
|
|
label: 'Level three 1-1-2'
|
|
}]
|
|
}]
|
|
}, {
|
|
id: 2,
|
|
label: 'Level one 2',
|
|
children: [{
|
|
id: 5,
|
|
label: 'Level two 2-1'
|
|
}, {
|
|
id: 6,
|
|
label: 'Level two 2-2'
|
|
}]
|
|
}, {
|
|
id: 3,
|
|
label: 'Level one 3',
|
|
children: [{
|
|
id: 7,
|
|
label: 'Level two 3-1'
|
|
}, {
|
|
id: 8,
|
|
label: 'Level two 3-2'
|
|
}]
|
|
}],
|
|
defaultProps: {
|
|
children: 'children',
|
|
label: 'label'
|
|
}
|
|
};
|
|
}
|
|
};
|
|
</script>
|
|
```
|
|
:::
|
|
|
|
### Accordion
|
|
|
|
Only one node among the same level can be expanded at one time.
|
|
|
|
::: demo
|
|
```html
|
|
<el-tree
|
|
:data="data"
|
|
:props="defaultProps"
|
|
accordion
|
|
@node-click="handleNodeClick">
|
|
</el-tree>
|
|
|
|
<script>
|
|
export default {
|
|
data() {
|
|
return {
|
|
data: [{
|
|
label: 'Level one 1',
|
|
children: [{
|
|
label: 'Level two 1-1',
|
|
children: [{
|
|
label: 'Level three 1-1-1'
|
|
}]
|
|
}]
|
|
}, {
|
|
label: 'Level one 2',
|
|
children: [{
|
|
label: 'Level two 2-1',
|
|
children: [{
|
|
label: 'Level three 2-1-1'
|
|
}]
|
|
}, {
|
|
label: 'Level two 2-2',
|
|
children: [{
|
|
label: 'Level three 2-2-1'
|
|
}]
|
|
}]
|
|
}, {
|
|
label: 'Level one 3',
|
|
children: [{
|
|
label: 'Level two 3-1',
|
|
children: [{
|
|
label: 'Level three 3-1-1'
|
|
}]
|
|
}, {
|
|
label: 'Level two 3-2',
|
|
children: [{
|
|
label: 'Level three 3-2-1'
|
|
}]
|
|
}]
|
|
}],
|
|
defaultProps: {
|
|
children: 'children',
|
|
label: 'label'
|
|
}
|
|
};
|
|
},
|
|
methods: {
|
|
handleNodeClick(data) {
|
|
console.log(data);
|
|
}
|
|
}
|
|
};
|
|
</script>
|
|
```
|
|
:::
|
|
|
|
### Attributes
|
|
| Attribute | Description | Type | Accepted Values | Default |
|
|
| --------------------- | ---------------------------------------- | --------------------------- | --------------- | ------- |
|
|
| data | tree data | array | — | — |
|
|
| empty-text | text displayed when data is void | string | — | — |
|
|
| node-key | unique identity key name for nodes, its value should be unique across the whole tree | string | — | — |
|
|
| props | configuration options, see the following table | object | — | — |
|
|
| load | method for loading subtree data | function(node, resolve) | — | — |
|
|
| render-content | render function for tree node | Function(h, { node } | — | — |
|
|
| highlight-current | whether current node is highlighted | boolean | — | false |
|
|
| current-node-key | key of current node, a set only prop | string, number | — | — |
|
|
| default-expand-all | whether to expand all nodes by default | boolean | — | false |
|
|
| expand-on-click-node | whether to expand or collapse node when clicking on the node, if false, then expand or collapse node only when clicking on the arrow icon. | — | true | |
|
|
| auto-expand-parent | whether to expand father node when a child node is expanded | boolean | — | true |
|
|
| default-expanded-keys | array of keys of initially expanded nodes | array | — | — |
|
|
| show-checkbox | whether node is selectable | boolean | — | false |
|
|
| check-strictly | whether checked state of a node not affects its father and child nodes when `show-checkbox` is `true` | boolean | — | false |
|
|
| default-checked-keys | array of keys of initially checked nodes | array | — | — |
|
|
| filter-node-method | this function will be executed on each node when use filter method. if return `false`, tree node will be hidden. | Function(value, data, node) | — | — |
|
|
| accordion | whether only one node among the same level can be expanded at one time | boolean | — | false |
|
|
| indent | horizontal indentation of nodes in adjacent levels in pixels | number | — | 16 |
|
|
|
|
### props
|
|
| Attribute | Description | Type | Accepted Values | Default |
|
|
| --------- | ---------------------------------------- | ------ | --------------- | ------- |
|
|
| label | specify which key of node object is used as the node's label | string | — | — |
|
|
| children | specify which key of node object is used as the node's subtree | string | — | — |
|
|
|
|
### Method
|
|
`Tree` has the following method, which returns the currently selected array of nodes.
|
|
| Method | Description | Parameters |
|
|
| --------------- | ---------------------------------------- | ---------------------------------------- |
|
|
| filter | filter all tree nodes, filtered nodes will be hidden | Accept a parameter which will be used as first parameter for filter-node-method |
|
|
| getCheckedNodes | If the node can be selected (`show-checkbox` is `true`), it returns the currently selected array of nodes | Accept a boolean type parameter whose default value is `false`. If the parameter is `true`, it only returns the currently selected array of sub-nodes. |
|
|
| setCheckedNodes | set certain nodes to be checked, only works when `node-key` is assigned | an array of nodes to be checked |
|
|
| getCheckedKeys | If the node can be selected (`show-checkbox` is `true`), it returns the currently selected array of node's keys | (leafOnly) Accept a boolean type parameter whose default value is `false`. If the parameter is `true`, it only returns the currently selected array of sub-nodes. |
|
|
| setCheckedKeys | set certain nodes to be checked, only works when `node-key` is assigned | (keys, leafOnly) Accept two parameters: 1. an array of node's keys to be checked 2. a boolean type parameter whose default value is `false`. If the parameter is `true`, it only returns the currently selected array of sub-nodes. |
|
|
| setChecked | set node to be checked or not, only works when `node-key` is assigned | (key/data, checked, deep) Accept three parameters: 1. node's key or data to be checked 2. a boolean typed parameter indicating checked or not. 3. a boolean typed parameter indicating deep or not. |
|
|
|
|
### Events
|
|
| Event Name | Description | Parameters |
|
|
| -------------- | ---------------------------------------- | ---------------------------------------- |
|
|
| node-click | triggers when a node is clicked | three parameters: node object corresponding to the node clicked, `node` property of TreeNode, TreeNode itself |
|
|
| check-change | triggers when the selected state of the node changes | three parameters: node object corresponding to the node whose selected state is changed, whether the node is selected, whether node's subtree has selected nodes |
|
|
| current-change | triggers when current node changes | two parameters: node object corresponding to the current node, `node` property of TreeNode |
|
|
| node-expand | triggers when current node open | three parameters: node object corresponding to the node opened, `node` property of TreeNode, TreeNode itself |
|
|
| node-collapse | triggers when current node close | three parameters: node object corresponding to the node closed, `node` property of TreeNode, TreeNode itself |
|