867 lines
29 KiB
Markdown
867 lines
29 KiB
Markdown
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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.
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:::demo This example also shows how to load node data asynchronously.
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```html
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<el-tree
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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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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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### Custom leaf node in lazy mode
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:::demo A node's data is not fetched until it is clicked, so the Tree cannot predict whether a node is a leaf node. That's why a drop-down button is added to each node, and if it is a leaf node, the drop-down button will disappear when clicked. That being said, you can also tell the Tree in advance whether the node is a leaf node, avoiding the render of the drop-down button before a leaf node.
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```html
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<el-tree
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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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</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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props: {
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label: 'name',
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children: 'zones',
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isLeaf: 'leaf'
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},
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};
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},
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methods: {
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loadNode(node, resolve) {
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if (node.level === 0) {
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return resolve([{ name: 'region' }]);
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}
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if (node.level > 1) return resolve([]);
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setTimeout(() => {
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const data = [{
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name: 'leaf',
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leaf: true
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}, {
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name: 'zone'
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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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### Disabled checkbox
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The checkbox of a node can be set as disabled.
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:::demo In the example, 'disabled' property is declared in defaultProps, and some nodes are set as 'disabled:true'. The corresponding checkboxes are disabled and can't be clicked.
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```html
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<el-tree
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:data="data"
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:props="defaultProps"
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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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data: [{
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id: 1,
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label: 'Level one 1',
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children: [{
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id: 3,
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label: 'Level two 2-1',
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children: [{
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id: 4,
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label: 'Level three 3-1-1'
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}, {
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id: 5,
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label: 'Level three 3-1-2',
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disabled: true
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}]
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}, {
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id: 2,
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label: 'Level two 2-2',
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disabled: true,
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children: [{
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id: 6,
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label: 'Level three 3-2-1'
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}, {
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id: 7,
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label: 'Level three 3-2-2',
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disabled: true
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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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disabled: 'disabled',
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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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### 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="data"
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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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data: [{
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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="data"
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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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data: [{
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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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||
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:::demo There are two ways to customize template for tree nodes: `render-content` and scoped slot. 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. If you prefer scoped slot, you'll have access to `node` and `data` in the scope, standing for the TreeNode object and node data of the current node respectively. Note that the `render-content` demo can't run in jsfiddle because it doesn't support JSX syntax. In a real project, `render-content` will work if relevant dependencies are correctly configured.
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```html
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<div class="custom-tree-container">
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<div class="block">
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<p>Using render-content</p>
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<el-tree
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:data="data"
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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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</div>
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<div class="block">
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<p>Using scoped slot</p>
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<el-tree
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:data="data"
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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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<span class="custom-tree-node" slot-scope="{ node, data }">
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<span>{{ node.label }}</span>
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<span>
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|
<el-button
|
||
|
|
type="text"
|
||
|
|
size="mini"
|
||
|
|
@click="() => append(data)">
|
||
|
|
Append
|
||
|
|
</el-button>
|
||
|
|
<el-button
|
||
|
|
type="text"
|
||
|
|
size="mini"
|
||
|
|
@click="() => remove(node, data)">
|
||
|
|
Delete
|
||
|
|
</el-button>
|
||
|
|
</span>
|
||
|
|
</span>
|
||
|
|
</el-tree>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<script>
|
||
|
|
let id = 1000;
|
||
|
|
|
||
|
|
export default {
|
||
|
|
data() {
|
||
|
|
const data = [{
|
||
|
|
id: 1,
|
||
|
|
label: 'Level one 1',
|
||
|
|
children: [{
|
||
|
|
id: 4,
|
||
|
|
label: 'Level two 1-1',
|
||
|
|
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'
|
||
|
|
}]
|
||
|
|
}];
|
||
|
|
return {
|
||
|
|
data: JSON.parse(JSON.stringify(data)),
|
||
|
|
data: JSON.parse(JSON.stringify(data))
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
methods: {
|
||
|
|
append(data) {
|
||
|
|
const newChild = { id: id++, label: 'testtest', children: [] };
|
||
|
|
if (!data.children) {
|
||
|
|
this.$set(data, 'children', []);
|
||
|
|
}
|
||
|
|
data.children.push(newChild);
|
||
|
|
},
|
||
|
|
|
||
|
|
remove(node, data) {
|
||
|
|
const parent = node.parent;
|
||
|
|
const children = parent.data.children || parent.data;
|
||
|
|
const index = children.findIndex(d => d.id === data.id);
|
||
|
|
children.splice(index, 1);
|
||
|
|
},
|
||
|
|
|
||
|
|
renderContent(h, { node, data, store }) {
|
||
|
|
return (
|
||
|
|
<span class="custom-tree-node">
|
||
|
|
<span>{node.label}</span>
|
||
|
|
<span>
|
||
|
|
<el-button size="mini" type="text" on-click={ () => this.append(data) }>Append</el-button>
|
||
|
|
<el-button size="mini" type="text" on-click={ () => this.remove(node, data) }>Delete</el-button>
|
||
|
|
</span>
|
||
|
|
</span>);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
</script>
|
||
|
|
|
||
|
|
<style>
|
||
|
|
.custom-tree-node {
|
||
|
|
flex: 1;
|
||
|
|
display: flex;
|
||
|
|
align-items: center;
|
||
|
|
justify-content: space-between;
|
||
|
|
font-size: 14px;
|
||
|
|
padding-right: 8px;
|
||
|
|
}
|
||
|
|
</style>
|
||
|
|
```
|
||
|
|
:::
|
||
|
|
|
||
|
|
### Tree node filtering
|
||
|
|
Tree nodes can be filtered
|
||
|
|
|
||
|
|
:::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.
|
||
|
|
```html
|
||
|
|
<el-input
|
||
|
|
placeholder="Filter keyword"
|
||
|
|
v-model="filterText">
|
||
|
|
</el-input>
|
||
|
|
|
||
|
|
<el-tree
|
||
|
|
class="filter-tree"
|
||
|
|
:data="data"
|
||
|
|
:props="defaultProps"
|
||
|
|
default-expand-all
|
||
|
|
:filter-node-method="filterNode"
|
||
|
|
ref="tree">
|
||
|
|
</el-tree>
|
||
|
|
|
||
|
|
<script>
|
||
|
|
export default {
|
||
|
|
watch: {
|
||
|
|
filterText(val) {
|
||
|
|
this.$refs.tree.filter(val);
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
methods: {
|
||
|
|
filterNode(value, data) {
|
||
|
|
if (!value) return true;
|
||
|
|
return data.label.indexOf(value) !== -1;
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
data() {
|
||
|
|
return {
|
||
|
|
filterText: '',
|
||
|
|
data: [{
|
||
|
|
id: 1,
|
||
|
|
label: 'Level one 1',
|
||
|
|
children: [{
|
||
|
|
id: 4,
|
||
|
|
label: 'Level two 1-1',
|
||
|
|
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>
|
||
|
|
```
|
||
|
|
:::
|
||
|
|
|
||
|
|
### Draggable
|
||
|
|
|
||
|
|
You can drag and drop Tree nodes by adding a `draggable` attribute.
|
||
|
|
|
||
|
|
:::demo
|
||
|
|
```html
|
||
|
|
<el-tree
|
||
|
|
:data="data"
|
||
|
|
node-key="id"
|
||
|
|
default-expand-all
|
||
|
|
@node-drag-start="handleDragStart"
|
||
|
|
@node-drag-enter="handleDragEnter"
|
||
|
|
@node-drag-leave="handleDragLeave"
|
||
|
|
@node-drag-over="handleDragOver"
|
||
|
|
@node-drag-end="handleDragEnd"
|
||
|
|
@node-drop="handleDrop"
|
||
|
|
draggable
|
||
|
|
:allow-drop="allowDrop"
|
||
|
|
:allow-drag="allowDrag">
|
||
|
|
</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: {
|
||
|
|
handleDragStart(node, ev) {
|
||
|
|
console.log('drag start', node);
|
||
|
|
},
|
||
|
|
handleDragEnter(draggingNode, dropNode, ev) {
|
||
|
|
console.log('tree drag enter: ', dropNode.label);
|
||
|
|
},
|
||
|
|
handleDragLeave(draggingNode, dropNode, ev) {
|
||
|
|
console.log('tree drag leave: ', dropNode.label);
|
||
|
|
},
|
||
|
|
handleDragOver(draggingNode, dropNode, ev) {
|
||
|
|
console.log('tree drag over: ', dropNode.label);
|
||
|
|
},
|
||
|
|
handleDragEnd(draggingNode, dropNode, dropType, ev) {
|
||
|
|
console.log('tree drag end: ', dropNode && dropNode.label, dropType);
|
||
|
|
},
|
||
|
|
handleDrop(draggingNode, dropNode, dropType, ev) {
|
||
|
|
console.log('tree drop: ', dropNode.label, dropType);
|
||
|
|
},
|
||
|
|
allowDrop(draggingNode, dropNode, type) {
|
||
|
|
if (dropNode.data.label === 'Level two 3-1') {
|
||
|
|
return type !== 'inner';
|
||
|
|
} else {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
},
|
||
|
|
allowDrag(draggingNode) {
|
||
|
|
return draggingNode.data.label.indexOf('Level three 3-1-1') === -1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
</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 | — | — |
|
||
|
|
| render-after-expand | whether to render child nodes only after a parent node is expanded for the first time | boolean | — | true |
|
||
|
|
| load | method for loading subtree data, only works when `lazy` is true | function(node, resolve) | — | — |
|
||
|
|
| render-content | render function for tree node | Function(h, { node, data, store } | — | — |
|
||
|
|
| highlight-current | whether current node is highlighted | boolean | — | false |
|
||
|
|
| 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. | boolean | — | true |
|
||
|
|
| check-on-click-node | whether to check or uncheck node when clicking on the node, if false, the node can only be checked or unchecked by clicking on the checkbox. | boolean | — | false |
|
||
|
|
| 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 | — | — |
|
||
|
|
| current-node-key | key of initially selected node | string, number | — | — |
|
||
|
|
| 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 |
|
||
|
|
| icon-class | custome tree node icon | string | - | - |
|
||
|
|
| lazy | whether to lazy load leaf node, used with `load` attribute | boolean | — | false |
|
||
|
|
| draggable | whether enable tree nodes drag and drop | boolean | — | false |
|
||
|
|
| allow-drag | this function will be executed before dragging a node. If `false` is returned, the node can not be dragged | Function(node) | — | — |
|
||
|
|
| allow-drop | this function will be executed before the dragging node is dropped. If `false` is returned, the dragging node can not be dropped at the target node. `type` has three possible values: 'prev' (inserting the dragging node before the target node), 'inner' (inserting the dragging node to the target node) and 'next' (inserting the dragging node after the target node) | Function(draggingNode, dropNode, type) | — | — |
|
||
|
|
|
||
|
|
### props
|
||
|
|
| Attribute | Description | Type | Accepted Values | Default |
|
||
|
|
| --------- | ---------------------------------------- | ------ | --------------- | ------- |
|
||
|
|
| label | specify which key of node object is used as the node's label | string, function(data, node) | — | — |
|
||
|
|
| children | specify which node object is used as the node's subtree | string | — | — |
|
||
|
|
| disabled | specify which key of node object represents if node's checkbox is disabled | boolean, function(data, node) | — | — |
|
||
|
|
| isLeaf | specify whether the node is a leaf node, only works when lazy load is enabled | boolean, function(data, node) | — | — |
|
||
|
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### Method
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`Tree` has the following method, which returns the currently selected array of nodes.
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| Method | Description | Parameters |
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| --------------- | ---------------------------------------- | ---------------------------------------- |
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| filter | filter all tree nodes, filtered nodes will be hidden | Accept a parameter which will be used as first parameter for filter-node-method |
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| updateKeyChildren | set new data to node, only works when `node-key` is assigned | (key, data) Accept two parameters: 1. key of node 2. new data |
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| getCheckedNodes | If the node can be selected (`show-checkbox` is `true`), it returns the currently selected array of nodes | (leafOnly, includeHalfChecked) Accept two boolean type parameters: 1. default value is `false`. If the parameter is `true`, it only returns the currently selected array of sub-nodes. 2. default value is `false`. If the parameter is `true`, the return value contains halfchecked nodes |
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| setCheckedNodes | set certain nodes to be checked, only works when `node-key` is assigned | an array of nodes to be checked |
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| 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. |
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| 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. |
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| 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. |
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| getHalfCheckedNodes | If the node can be selected (`show-checkbox` is `true`), it returns the currently half selected array of nodes | - |
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| getHalfCheckedKeys | If the node can be selected (`show-checkbox` is `true`), it returns the currently half selected array of node's keys | - |
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| getCurrentKey | return the highlight node's key (null if no node is highlighted) | — |
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| getCurrentNode | return the highlight node's data (null if no node is highlighted) | — |
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| setCurrentKey | set highlighted node by key, only works when `node-key` is assigned | (key) the node's key to be highlighted. If `null`, cancel the currently highlighted node |
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| setCurrentNode | set highlighted node, only works when `node-key` is assigned | (node) the node to be highlighted |
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| getNode | get node by data or key | (data) the node's data or key |
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| remove | remove a node, only works when node-key is assigned | (data) the node's data or node to be deleted |
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| append | append a child node to a given node in the tree | (data, parentNode) 1. child node's data to be appended 2. parent node's data, key or node |
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| insertBefore | insert a node before a given node in the tree | (data, refNode) 1. node's data to be inserted 2. reference node's data, key or node |
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| insertAfter | insert a node after a given node in the tree | (data, refNode) 1. node's data to be inserted 2. reference node's data, key or node |
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### Events
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| Event Name | Description | Parameters |
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| -------------- | ---------------------------------------- | ---------------------------------------- |
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| node-click | triggers when a node is clicked | three parameters: node object corresponding to the node clicked, `node` property of TreeNode, TreeNode itself |
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| node-contextmenu | triggers when a node is clicked by right button | four parameters: event, node object corresponding to the node clicked, `node` property of TreeNode, TreeNode itself |
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| 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 |
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| check | triggers after clicking the checkbox of a node | two parameters: node object corresponding to the node that is checked / unchecked, tree checked status object which has four props: checkedNodes, checkedKeys, halfCheckedNodes, halfCheckedKeys |
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| current-change | triggers when current node changes | two parameters: node object corresponding to the current node, `node` property of TreeNode |
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| node-expand | triggers when current node open | three parameters: node object corresponding to the node opened, `node` property of TreeNode, TreeNode itself |
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| node-collapse | triggers when current node close | three parameters: node object corresponding to the node closed, `node` property of TreeNode, TreeNode itself |
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| node-drag-start | triggers when dragging starts | two parameters: node object corresponding to the dragging node, event. |
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| node-drag-enter | triggers when the dragging node enters another node | three parameters: node object corresponding to the dragging node, node object corresponding to the entering node, event. |
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| node-drag-leave | triggers when the dragging node leaves a node | three parameters: node object corresponding to the dragging node, node object corresponding to the leaving node, event. |
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| node-drag-over | triggers when dragging over a node (like mouseover event) | three parameters: node object corresponding to the dragging node, node object corresponding to the dragging over node, event. |
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| node-drag-end | triggers when dragging ends | four parameters: node object corresponding to the dragging node, node object corresponding to the dragging end node (may be `undefined`), node drop type (before / after / inner), event. |
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| node-drop | triggers after the dragging node is dropped | four parameters: node object corresponding to the dragging node, node object corresponding to the dropped node, node drop type (before / after / inner), event. |
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### Scoped Slot
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| Name | Description |
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|------|--------|
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| — | Custom content for tree nodes. The scope parameter is { node, data } |
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