elementUI Tree 树形控件的官方使用文档

<el-tree :data="data" :props="defaultProps" @node-click="handleNodeClick"></el-tree>
 
<script>
 export default {
 data() {
  return {
  data: [{
   label: '一级 1',
   children: [{
   label: '二级 1-1',
   children: [{
    label: '三级 1-1-1'
   }]
   }]
  }, {
   label: '一级 2',
   children: [{
   label: '二级 2-1',
   children: [{
    label: '三级 2-1-1'
   }]
   }, {
   label: '二级 2-2',
   children: [{
    label: '三级 2-2-1'
   }]
   }]
  }, {
   label: '一级 3',
   children: [{
   label: '二级 3-1',
   children: [{
    label: '三级 3-1-1'
   }]
   }, {
   label: '二级 3-2',
   children: [{
    label: '三级 3-2-1'
   }]
   }]
  }],
  defaultProps: {
   children: 'children',
   label: 'label'
  }
  };
 },
 methods: {
  handleNodeClick(data) {
  console.log(data);
  }
 }
 };
</script>

<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: '一级 1',
   children: [{
   id: 4,
   label: '二级 1-1',
   children: [{
    id: 9,
    label: '三级 1-1-1'
   }, {
    id: 10,
    label: '三级 1-1-2'
   }]
   }]
  }, {
   id: 2,
   label: '一级 2',
   children: [{
   id: 5,
   label: '二级 2-1'
   }, {
   id: 6,
   label: '二级 2-2'
   }]
  }, {
   id: 3,
   label: '一级 3',
   children: [{
   id: 7,
   label: '二级 3-1'
   }, {
   id: 8,
   label: '二级 3-2'
   }]
  }],
  defaultProps: {
   children: 'children',
   label: 'label'
  }
  };
 }
 };
</script>

<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: '一级 2',
   children: [{
   id: 3,
   label: '二级 2-1',
   children: [{
    id: 4,
    label: '三级 3-1-1'
   }, {
    id: 5,
    label: '三级 3-1-2',
    disabled: true
   }]
   }, {
   id: 2,
   label: '二级 2-2',
   disabled: true,
   children: [{
    id: 6,
    label: '三级 3-2-1'
   }, {
    id: 7,
    label: '三级 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">通过 node 获取</el-button>
 <el-button @click="getCheckedKeys">通过 key 获取</el-button>
 <el-button @click="setCheckedNodes">通过 node 设置</el-button>
 <el-button @click="setCheckedKeys">通过 key 设置</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.$refs.tree.setCheckedNodes([{
   id: 5,
   label: '二级 2-1'
  }, {
   id: 9,
   label: '三级 1-1-1'
  }]);
  },
  setCheckedKeys() {
  this.$refs.tree.setCheckedKeys([3]);
  },
  resetChecked() {
  this.$refs.tree.setCheckedKeys([]);
  }
 },
 
 data() {
  return {
  data2: [{
   id: 1,
   label: '一级 1',
   children: [{
   id: 4,
   label: '二级 1-1',
   children: [{
    id: 9,
    label: '三级 1-1-1'
   }, {
    id: 10,
    label: '三级 1-1-2'
   }]
   }]
  }, {
   id: 2,
   label: '一级 2',
   children: [{
   id: 5,
   label: '二级 2-1'
   }, {
   id: 6,
   label: '二级 2-2'
   }]
  }, {
   id: 3,
   label: '一级 3',
   children: [{
   id: 7,
   label: '二级 3-1'
   }, {
   id: 8,
   label: '二级 3-2'
   }]
  }],
  defaultProps: {
   children: 'children',
   label: 'label'
  }
  };
 }
 };
</script>

<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: '一级 1',
  children: [{
   id: 4,
   label: '二级 1-1',
   children: [{
   id: 9,
   label: '三级 1-1-1'
   }, {
   id: 10,
   label: '三级 1-1-2'
   }]
  }]
  }, {
  id: 2,
  label: '一级 2',
  children: [{
   id: 5,
   label: '二级 2-1'
  }, {
   id: 6,
   label: '二级 2-2'
  }]
  }, {
  id: 3,
  label: '一级 3',
  children: [{
   id: 7,
   label: '二级 3-1'
  }, {
   id: 8,
   label: '二级 3-2'
  }]
  }];
  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="输入关键字进行过滤"
 v-model="filterText">
</el-input>
 
<el-tree
 class="filter-tree"
 :data="data2"
 :props="defaultProps"
 default-expand-all
 :filter-node-method="filterNode"
 ref="tree2">
</el-tree>
 
<script>
 export default {
 watch: {
  filterText(val) {
  this.$refs.tree2.filter(val);
  }
 },
 
 methods: {
  filterNode(value, data) {
  if (!value) return true;
  return data.label.indexOf(value) !== -1;
  }
 },
 
 data() {
  return {
  filterText: '',
  data2: [{
   id: 1,
   label: '一级 1',
   children: [{
   id: 4,
   label: '二级 1-1',
   children: [{
    id: 9,
    label: '三级 1-1-1'
   }, {
    id: 10,
    label: '三级 1-1-2'
   }]
   }]
  }, {
   id: 2,
   label: '一级 2',
   children: [{
   id: 5,
   label: '二级 2-1'
   }, {
   id: 6,
   label: '二级 2-2'
   }]
  }, {
   id: 3,
   label: '一级 3',
   children: [{
   id: 7,
   label: '二级 3-1'
   }, {
   id: 8,
   label: '二级 3-2'
   }]
  }],
  defaultProps: {
   children: 'children',
   label: 'label'
  }
  };
 }
 };
</script>

<el-tree
 :data="data"
 :props="defaultProps"
 accordion
 @node-click="handleNodeClick">
</el-tree>
 
<script>
 export default {
 data() {
  return {
  data: [{
   label: '一级 1',
   children: [{
   label: '二级 1-1',
   children: [{
    label: '三级 1-1-1'
   }]
   }]
  }, {
   label: '一级 2',
   children: [{
   label: '二级 2-1',
   children: [{
    label: '三级 2-1-1'
   }]
   }, {
   label: '二级 2-2',
   children: [{
    label: '三级 2-2-1'
   }]
   }]
  }, {
   label: '一级 3',
   children: [{
   label: '二级 3-1',
   children: [{
    label: '三级 3-1-1'
   }]
   }, {
   label: '二级 3-2',
   children: [{
    label: '三级 3-2-1'
   }]
   }]
  }],
  defaultProps: {
   children: 'children',
   label: 'label'
  }
  };
 },
 methods: {
  handleNodeClick(data) {
  console.log(data);
  }
 }
 };
</script>

<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: '一级 1',
   children: [{
   id: 4,
   label: '二级 1-1',
   children: [{
    id: 9,
    label: '三级 1-1-1'
   }, {
    id: 10,
    label: '三级 1-1-2'
   }]
   }]
  }, {
   id: 2,
   label: '一级 2',
   children: [{
   id: 5,
   label: '二级 2-1'
   }, {
   id: 6,
   label: '二级 2-2'
   }]
  }, {
   id: 3,
   label: '一级 3',
   children: [{
   id: 7,
   label: '二级 3-1'
   }, {
   id: 8,
   label: '二级 3-2',
   children: [{
    id: 11,
    label: '三级 3-2-1'
   }, {
    id: 12,
    label: '三级 3-2-2'
   }, {
    id: 13,
    label: '三级 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 !== '二级 3-1';
  },
  allowDrag(draggingNode) {
  return draggingNode.data.label.indexOf('三级 3-1-1') === -1;
  }
 }
 };
</script>