elementUI Tree 樹形控件的官方使用文檔

<el-tree :data="data" :props="defaultProps" @node-click="handleNodeClick"></el-tree>
 
<script>
 export default {
 data() {
 return {
 data: [{
 label: '一級 1',
 children: [{
 label: '二級 1-1',
 children: [{
 label: '三級 1-1-1'
 }]
 }]
 }, {
 label: '一級 2',
 children: [{
 label: '二級 2-1',
 children: [{
 label: '三級 2-1-1'
 }]
 }, {
 label: '二級 2-2',
 children: [{
 label: '三級 2-2-1'
 }]
 }]
 }, {
 label: '一級 3',
 children: [{
 label: '二級 3-1',
 children: [{
 label: '三級 3-1-1'
 }]
 }, {
 label: '二級 3-2',
 children: [{
 label: '三級 3-2-1'
 }]
 }]
 }],
 defaultProps: {
 children: 'children',
 label: 'label'
 }
 };
 },
 methods: {
 handleNodeClick(data) {
 console.log(data);
 }
 }
 };
</script>

<el-tree
 :props="props"
 :load="loadNode"
 lazy
 show-checkbox
 @check-change="handleCheckChange">
</el-tree>
 
<script>
 export default {
 data() {
 return {
 props: {
 label: 'name',
 children: 'zones'
 },
 count: 1
 };
 },
 methods: {
 handleCheckChange(data, checked, indeterminate) {
 console.log(data, checked, indeterminate);
 },
 handleNodeClick(data) {
 console.log(data);
 },
 loadNode(node, resolve) {
 if (node.level === 0) {
 return resolve([{ name: 'region1' }, { name: 'region2' }]);
 }
 if (node.level > 3) return resolve([]);
 
 var hasChild;
 if (node.data.name === 'region1') {
 hasChild = true;
 } else if (node.data.name === 'region2') {
 hasChild = false;
 } else {
 hasChild = Math.random() > 0.5;
 }
 
 setTimeout(() => {
 var data;
 if (hasChild) {
 data = [{
 name: 'zone' + this.count++
 }, {
 name: 'zone' + this.count++
 }];
 } else {
 data = [];
 }
 
 resolve(data);
 }, 500);
 }
 }
 };
</script>

<el-tree
 :props="props1"
 :load="loadNode1"
 lazy
 show-checkbox>
</el-tree>
 
<script>
 export default {
 data() {
 return {
 props1: {
 label: 'name',
 children: 'zones',
 isLeaf: 'leaf'
 },
 };
 },
 methods: {
 loadNode1(node, resolve) {
 if (node.level === 0) {
 return resolve([{ name: 'region' }]);
 }
 if (node.level > 1) return resolve([]);
 
 setTimeout(() => {
 const data = [{
 name: 'leaf',
 leaf: true
 }, {
 name: 'zone'
 }];
 
 resolve(data);
 }, 500);
 }
 }
 };
</script>

<el-tree
 :data="data2"
 show-checkbox
 node-key="id"
 :default-expanded-keys="[2, 3]"
 :default-checked-keys="[5]"
 :props="defaultProps">
</el-tree>
 
<script>
 export default {
 data() {
 return {
 data2: [{
 id: 1,
 label: '一級 1',
 children: [{
 id: 4,
 label: '二級 1-1',
 children: [{
 id: 9,
 label: '三級 1-1-1'
 }, {
 id: 10,
 label: '三級 1-1-2'
 }]
 }]
 }, {
 id: 2,
 label: '一級 2',
 children: [{
 id: 5,
 label: '二級 2-1'
 }, {
 id: 6,
 label: '二級 2-2'
 }]
 }, {
 id: 3,
 label: '一級 3',
 children: [{
 id: 7,
 label: '二級 3-1'
 }, {
 id: 8,
 label: '二級 3-2'
 }]
 }],
 defaultProps: {
 children: 'children',
 label: 'label'
 }
 };
 }
 };
</script>

<el-tree
 :data="data3"
 show-checkbox
 node-key="id"
 :default-expanded-keys="[2, 3]"
 :default-checked-keys="[5]">
</el-tree>
 
<script>
 export default {
 data() {
 return {
 data3: [{
 id: 1,
 label: '一級 2',
 children: [{
 id: 3,
 label: '二級 2-1',
 children: [{
 id: 4,
 label: '三級 3-1-1'
 }, {
 id: 5,
 label: '三級 3-1-2',
 disabled: true
 }]
 }, {
 id: 2,
 label: '二級 2-2',
 disabled: true,
 children: [{
 id: 6,
 label: '三級 3-2-1'
 }, {
 id: 7,
 label: '三級 3-2-2',
 disabled: true
 }]
 }]
 }],
 defaultProps: {
 children: 'children',
 label: 'label'
 }
 };
 }
 };
</script>

<el-tree
 :data="data2"
 show-checkbox
 default-expand-all
 node-key="id"
 ref="tree"
 highlight-current
 :props="defaultProps">
</el-tree>
 
<div class="buttons">
 <el-button @click="getCheckedNodes">通過 node 獲取</el-button>
 <el-button @click="getCheckedKeys">通過 key 獲取</el-button>
 <el-button @click="setCheckedNodes">通過 node 設置</el-button>
 <el-button @click="setCheckedKeys">通過 key 設置</el-button>
 <el-button @click="resetChecked">清空</el-button>
</div>
 
<script>
 export default {
 methods: {
 getCheckedNodes() {
 console.log(this.$refs.tree.getCheckedNodes());
 },
 getCheckedKeys() {
 console.log(this.$refs.tree.getCheckedKeys());
 },
 setCheckedNodes() {
 this.$refs.tree.setCheckedNodes([{
 id: 5,
 label: '二級 2-1'
 }, {
 id: 9,
 label: '三級 1-1-1'
 }]);
 },
 setCheckedKeys() {
 this.$refs.tree.setCheckedKeys([3]);
 },
 resetChecked() {
 this.$refs.tree.setCheckedKeys([]);
 }
 },
 
 data() {
 return {
 data2: [{
 id: 1,
 label: '一級 1',
 children: [{
 id: 4,
 label: '二級 1-1',
 children: [{
 id: 9,
 label: '三級 1-1-1'
 }, {
 id: 10,
 label: '三級 1-1-2'
 }]
 }]
 }, {
 id: 2,
 label: '一級 2',
 children: [{
 id: 5,
 label: '二級 2-1'
 }, {
 id: 6,
 label: '二級 2-2'
 }]
 }, {
 id: 3,
 label: '一級 3',
 children: [{
 id: 7,
 label: '二級 3-1'
 }, {
 id: 8,
 label: '二級 3-2'
 }]
 }],
 defaultProps: {
 children: 'children',
 label: 'label'
 }
 };
 }
 };
</script>

<div class="custom-tree-container">
 <div class="block">
 <p>使用 render-content</p>
 <el-tree
 :data="data4"
 show-checkbox
 node-key="id"
 default-expand-all
 :expand-on-click-node="false"
 :render-content="renderContent">
 </el-tree>
 </div>
 <div class="block">
 <p>使用 scoped slot</p>
 <el-tree
 :data="data5"
 show-checkbox
 node-key="id"
 default-expand-all
 :expand-on-click-node="false">
 <span class="custom-tree-node" slot-scope="{ node, data }">
 <span>{{ node.label }}</span>
 <span>
 <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: '一級 1',
 children: [{
 id: 4,
 label: '二級 1-1',
 children: [{
 id: 9,
 label: '三級 1-1-1'
 }, {
 id: 10,
 label: '三級 1-1-2'
 }]
 }]
 }, {
 id: 2,
 label: '一級 2',
 children: [{
 id: 5,
 label: '二級 2-1'
 }, {
 id: 6,
 label: '二級 2-2'
 }]
 }, {
 id: 3,
 label: '一級 3',
 children: [{
 id: 7,
 label: '二級 3-1'
 }, {
 id: 8,
 label: '二級 3-2'
 }]
 }];
 return {
 data4: JSON.parse(JSON.stringify(data)),
 data5: 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>

<el-input
 placeholder="輸入關鍵字進行過濾"
 v-model="filterText">
</el-input>
 
<el-tree
 class="filter-tree"
 :data="data2"
 :props="defaultProps"
 default-expand-all
 :filter-node-method="filterNode"
 ref="tree2">
</el-tree>
 
<script>
 export default {
 watch: {
 filterText(val) {
 this.$refs.tree2.filter(val);
 }
 },
 
 methods: {
 filterNode(value, data) {
 if (!value) return true;
 return data.label.indexOf(value) !== -1;
 }
 },
 
 data() {
 return {
 filterText: '',
 data2: [{
 id: 1,
 label: '一級 1',
 children: [{
 id: 4,
 label: '二級 1-1',
 children: [{
 id: 9,
 label: '三級 1-1-1'
 }, {
 id: 10,
 label: '三級 1-1-2'
 }]
 }]
 }, {
 id: 2,
 label: '一級 2',
 children: [{
 id: 5,
 label: '二級 2-1'
 }, {
 id: 6,
 label: '二級 2-2'
 }]
 }, {
 id: 3,
 label: '一級 3',
 children: [{
 id: 7,
 label: '二級 3-1'
 }, {
 id: 8,
 label: '二級 3-2'
 }]
 }],
 defaultProps: {
 children: 'children',
 label: 'label'
 }
 };
 }
 };
</script>

<el-tree
 :data="data"
 :props="defaultProps"
 accordion
 @node-click="handleNodeClick">
</el-tree>
 
<script>
 export default {
 data() {
 return {
 data: [{
 label: '一級 1',
 children: [{
 label: '二級 1-1',
 children: [{
 label: '三級 1-1-1'
 }]
 }]
 }, {
 label: '一級 2',
 children: [{
 label: '二級 2-1',
 children: [{
 label: '三級 2-1-1'
 }]
 }, {
 label: '二級 2-2',
 children: [{
 label: '三級 2-2-1'
 }]
 }]
 }, {
 label: '一級 3',
 children: [{
 label: '二級 3-1',
 children: [{
 label: '三級 3-1-1'
 }]
 }, {
 label: '二級 3-2',
 children: [{
 label: '三級 3-2-1'
 }]
 }]
 }],
 defaultProps: {
 children: 'children',
 label: 'label'
 }
 };
 },
 methods: {
 handleNodeClick(data) {
 console.log(data);
 }
 }
 };
</script>

<el-tree
 :data="data6"
 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 {
 data6: [{
 id: 1,
 label: '一級 1',
 children: [{
 id: 4,
 label: '二級 1-1',
 children: [{
 id: 9,
 label: '三級 1-1-1'
 }, {
 id: 10,
 label: '三級 1-1-2'
 }]
 }]
 }, {
 id: 2,
 label: '一級 2',
 children: [{
 id: 5,
 label: '二級 2-1'
 }, {
 id: 6,
 label: '二級 2-2'
 }]
 }, {
 id: 3,
 label: '一級 3',
 children: [{
 id: 7,
 label: '二級 3-1'
 }, {
 id: 8,
 label: '二級 3-2',
 children: [{
 id: 11,
 label: '三級 3-2-1'
 }, {
 id: 12,
 label: '三級 3-2-2'
 }, {
 id: 13,
 label: '三級 3-2-3'
 }]
 }]
 }],
 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) {
 return dropNode.data.label !== '二級 3-1';
 },
 allowDrag(draggingNode) {
 return draggingNode.data.label.indexOf('三級 3-1-1') === -1;
 }
 }
 };
</script>