element-ui tree结构实现增删改自定义功能代码

编程学习 2021-07-04 14:06www.dzhlxh.cn编程入门
这篇文章主要介绍了element-ui tree结构实现增删改自定义功能代码,具有很好的参考价值,希望对大家有所帮助。一起跟随长沙网络推广过来看看吧

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>

狼蚁网站SEO优化是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">
  <h3 class="el-icon-folder" style="margin: 0px">
   {{ name }}
  </h3>
  <el-tree
   ref="tree"
   :data="setTree"
   :props="defaultProps"
   node-key="id"
   style="margin-top:20px"
   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
 }
}

以上这篇element-ui tree结构实现增删改自定义功能代码就是长沙网络推广分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持狼蚁SEO。

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