这期内容当中小编将会给大家带来有关element-ui tree如何实现自定义增删改查功能，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。
首先是页面部分
<template> <el-tree id="userMtree" ref="tree" :data="treeData" node-key="id" :render-content="renderContent" :expand-on-click-node="false" @node-click="nodeClick" :default-expanded-keys='expandedKey' ></el-tree> </template>
下面是js部分
export default {
props:['treeDataObj','isUserMgt'],//父级传值 与判断哪个tree
data () {
return {
treeData:[],//tree数据
expandedKey:[],//展开节点
checkedID:''//选中节点
}
},
mounted(){
this.treeData=this.treeDataObj.treeData
let userMtree=document.getElementById('userMtree')
this.$nextTick(()=>{
userMtree.firstElementChild.classList.add("is-current");//添加选中类名
})
this.checkedID=this.treeData[0].id//默认选中第一个
},
methods:{
//编辑
nodeEdit(ev, store, data) {
data.isEdit = true;
this.$nextTick(() => {//得到input
const $input =
ev.target.parentNode.parentNode.querySelector("input") ||
ev.target.parentElement.parentElement.querySelector("input");
!$input ? "" : $input.focus();//获取焦点
});
},
//失焦事件
edit_sure(ev, data) {
const $input =
ev.target.parentNode.parentNode.querySelector("input") ||
ev.target.parentElement.parentElement.querySelector("input");
if (!$input) {
return false;
} else if($input.value==''){
this.$message({
type: "info",
message: "内容不能为空!"
});
}else{//赋值value
data.label = $input.value;
data.isEdit = false;
}
},
//react方法 插入代码
renderContent(h, { node, data, store }) {
return (
<span class="custom-tree-node">
<span class="tree_node_label">{this.showOrEdit(data)}</span>
<div class="tree_node_op">
<i class="el-icon-edit" on-click={ev => this.nodeEdit(ev, store, data)}/>
<i class="el-icon-remove-outline"
on-click={() => this.nodeDelete(node, data)}/>
{
this.isUserMgt?<i class="el-icon-circle-plus-outline"
on-click={() => this.append( data)}></i>:''
}
</div>
</span>
);
},
showOrEdit(data) {
if (data.isEdit) {
return (
<input type="text" class="node_labe" value={data.label}
on-blur={ev => this.edit_sure(ev, data)} />
);
} else {
return <span class="node_labe">{data.label}</span>;
}
},
//新增节点
append(data) {
const newChild = { id: new Date().getTime(), label: '', children: [],
isEdit: true };
//判断是否有子节点
if (!data.children) {
this.$set(data, 'children', []);
}
data.children.push(newChild);
this.expandedKey=[data]//展开点击节点
},
//移除节点
nodeDelete(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)
},
//点击节点 移除默认选中节点
nodeClick(data){
let userMtree=document.getElementById('userMtree')
userMtree.firstElementChild.classList.remove("is-current");
this.checkedID=data.id
console.log(data)
this.$emit('emitClickNode',data)
}
}
}补充知识：vue前端基础之组件封装（树组件的封装附带增删改查方法）
组件封装的意义
组件封装的意义其实很好理解，对于一段复用性极高的代码，就需要进行组件封装以减少冗余代码。
树的封装
<template>
<el-aside width="180px">
<h4 class="el-icon-folder" >
{{ name }}
</h4>
<el-tree
ref="tree"
:data="setTree"
:props="defaultProps"
node-key="id"
accordion
@node-contextmenu="rihgtClick"
>
<span slot-scope="{ node, data }" class="span-ellipsis">
<span v-show="!node.isEdit">
<span v-show="data.children && data.children.length >= 1">
<span :title="node.label">{{ node.label }}</span>
</span>
<span v-show="!data.children || data.children.length == 0">
<span :title="node.label"> {{ node.label }}</span>
</span>
</span>
</span>
</el-tree>
<!--鼠标右键点击出现页面-->
<div v-show="menuVisible">
<el-menu
id="rightClickMenu"
class="el-menu-vertical"
text-color="#000000"
active-text-color="#000000"
@select="handleRightSelect"
>
<el-menu-item index="1" :hidden="showQuery" class="menuItem">
<span slot="title">查询</span>
</el-menu-item>
<el-menu-item index="2" :hidden="showSave" class="menuItem">
<span slot="title">添加</span>
</el-menu-item>
<el-menu-item index="3" :hidden="showUpdate" class="menuItem">
<span slot="title">修改</span>
</el-menu-item>
<el-menu-item index="4" :hidden="showDelete" class="menuItem">
<span slot="title">删除</span>
</el-menu-item>
</el-menu>
</div>
</el-aside>
</template>
<script>
export default {
name: 'Tree',
props: {
treeData: {
type: Array,
required: true
},
treeName: {
type: String,
required: true,
default: '树'
},
isHiddenQuery: {
type: Boolean,
required: false,
default: true
},
isHiddenSave: {
type: Boolean,
required: false,
default: false
},
isHiddenUpdate: {
type: Boolean,
required: false,
default: false
},
isHiddenDelete: {
type: Boolean,
required: false,
default: false
}
},
data() {
return {
setTree: this.treeData,
showQuery: this.isHiddenQuery,
showSave: this.isHiddenSave,
showUpdate: this.isHiddenUpdate,
showDelete: this.isHiddenDelete,
name: this.treeName,
TREEDATA: {
DATA: null,
NODE: null
},
isLoadingTree: true, // 是否加载节点树
objectID: null,
defaultProps: {
children: 'children',
label: 'name'
},
menuVisible: this.menuVisible
}
},
watch: {
treeData(val) {
this.setTree = val
},
treeName(val) {
this.name = val
}
},
methods: {
handleRightSelect(key) {
if (key === '1') {
this.$emit('NodeQuery', this.TREEDATA)
this.menuVisible = false
} else if (key === '2') {
this.$emit('NodeAdd', this.TREEDATA)
this.menuVisible = false
} else if (key === '3') {
this.$emit('NodeUpdate', this.TREEDATA)
this.menuVisible = false
} else if (key === '4') {
this.$emit('NodeDel', this.TREEDATA)
this.menuVisible = false
}
},
rihgtClick(event, object, value, element) {
if (this.objectID !== object.id) {
this.objectID = object.id
this.menuVisible = true
this.TREEDATA.DATA = object
this.TREEDATA.NODE = value
} else {
this.menuVisible = !this.menuVisible
}
document.addEventListener('click', e => {
this.menuVisible = false
})
const menu = document.querySelector('#rightClickMenu')
/* 菜单定位基于鼠标点击位置 */
menu.style.left = event.clientX - 180 + 'px'
menu.style.top = event.clientY - 100 + 'px'
menu.style.position = 'absolute' // 为新创建的DIV指定绝对定位
menu.style.width = 120 + 'px'
}
}
}
</script>
<style lang="scss" scoped>
.span-ellipsis {
width: 100%;
overflow: hidden;
margin-left: 10px;
white-space: nowrap;
text-overflow: ellipsis;
}
</style>对于组件的引用
import tree from '@/components/Tree/index'
export default {
components: { tree },
data() {}
......组件的使用
<tree :tree-data="setTree" :tree-name="treeName" @NodeAdd="NodeAdd" @NodeUpdate="NodeUpdate" @NodeDel="NodeDel" />
setTree是要给树赋予的值，treeName是树的标题（可不要），后面是需要的树的右键操作我启用了增删改
效果图
子组件向父组件传值
handleRightSelect(key) {
if (key === '1') {
this.$emit('NodeQuery', this.TREEDATA)
this.menuVisible = false
} else if (key === '2') {
this.$emit('NodeAdd', this.TREEDATA)
this.menuVisible = false
} else if (key === '3') {
this.$emit('NodeUpdate', this.TREEDATA)
this.menuVisible = false
} else if (key === '4') {
this.$emit('NodeDel', this.TREEDATA)
this.menuVisible = false
}
}上述就是小编为大家分享的element-ui tree如何实现自定义增删改查功能了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注亿速云行业资讯频道。
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