elementUI Tree 树形控件的官方使用文档

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>

节点过滤

通过关键字过滤树节点

在需要对节点进行过滤时，调用 Tree 实例的

filter

方法，参数为关键字。需要注意的是，此时需要设置

filter-node-method

，值为过滤函数。

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

手风琴模式

对于同一级的节点，每次只能展开一个