我用Vue.js与ElementUI搭建了一个无限级联层级表格组件

 前言

今天，建个级联回老家了。无限第一件事就是层级回家把大屏安排上，写作的表格感觉太爽了，终于可以专心地写文章了。组件我们今天要做的建个级联项目是怎么样搭建一个无限级联层级表格组件，好了，无限多了不多说，层级赶快行动起来吧!

项目一览

到底是表格啥样子来?我们来看下。

正如你所看到的组件那样，这个组件涉及添加、建个级联删除、无限编辑功能，层级并且可以无限级嵌套。表格那么怎样实现的组件?我们来看下。

源码

直接给出源码，就是这么直接。源码库

<template>     <div class="container">         <el-button             type="primary"             size="small"             @click="handleCreate"             icon="el-icon-circle-plus-outline"             style="margin: 10px 0"             >添加</el-button         >         <el-table             :data="tableData"             style="width: 100%; margin-bottom: 20px"             border             row-key="value"             stripe             size="medium"             :tree-props="{  children: children }"         >             <el-table-column prop="label" label="标签名称"> </el-table-column>             <el-table-column prop="location" label="层级"> </el-table-column>             <el-table-column label="操作" :align="alignDir" width="180">                 <template slot-scope="scope">                     <el-button                         type="text"                         size="small"                         @click="handleUpdate(scope.row)"                         >编辑</el-button                     >                     <el-button                         type="text"                         size="small"                         @click="deleteClick(scope.row)"                         >删除</el-button                     >                 </template>             </el-table-column>         </el-table>         <el-dialog             :title="textMap[dialogStatus]"             :visible.sync="dialogFormVisible"             width="30%"         >             <el-form                 ref="dataForm"                 :rules="rules"                 :model="temp"                 label-position="left"                 label-width="120px"                 style="margin-left: 50px"             >                 <el-form-item                     label="层级："                     prop="location"                     v-if="dialogStatus !== update"                 >                     <el-select                         v-model="temp.location"                         placeholder="请选择层级"                         @change="locationChange"                         size="small"                     >                         <el-option                             v-for="item in locationData"                             :key="item.id"                             :label="item.name"                             :value="item.id"                         />                     </el-select>                 </el-form-item>                 <el-form-item                     v-if="sonStatus && dialogStatus !== update"                     label="子位置："                     prop="children"                 >                     <el-cascader                         size="small"                         :key="isResouceShow"                         v-model="temp.children"                         placeholder="请选择子位置"                         :label="label"                         :value="value"                         :options="tableData"                         :props="{  checkStrictly: true }"                         clearable                         @change="getCasVal"                     ></el-cascader>                 </el-form-item>                 <el-form-item label="标签名称：" prop="label">                     <el-input                         v-model="temp.label"                         size="small"                         autocomplete="off"                         placeholder="请输入标签名称"                     ></el-input>                 </el-form-item>             </el-form>             <div slot="footer" class="dialog-footer">                 <el-button @click="dialogFormVisible = false" size="small">                     取消                 </el-button>                 <el-button                     type="primary"                     size="small"                     @click="                         dialogStatus === create ? createData() : updateData()                     "                 >                     确认                 </el-button>             </div>         </el-dialog>     </div> </template> <script> export default {      name: Tag,     data() {          return {              alignDir: center,             textMap: {                  update: 编辑,                 create: 添加,             },             dialogStatus: ,             dialogFormVisible: false,             temp: { },             isResouceShow: 1,             sonStatus: false,             casArr: [],             idx: ,             childKey: [],             rules: {                  location: [                     {                          required: true,                         message: 请选择层级,                         trigger: blur,                     },                 ],                 label: [                     {  required: true, message: 请输入名称, trigger: blur },                 ],                 children: [                     {                          required: true,                         message: 请选择子位置,                         trigger: blur,                     },                 ],             },             locationData: [                 {                      id: 1,                     name: 顶,                 },                 {                      id: 2,                     name: 子,                 },             ],             tableData: [                 {                      tagId: 1, // 标签id                     label: 第0, // 标签名称                     parent: , // 父级名称                     location: 1, // 层级                     value: 0, // 标识位                     children: [                         {                              tagId: 1, // 子标签id                             childKey: [0, 0], // 子标识位                             label: 第0-0,                             parent: 第0,                             location: 2,                             value: 0-0,                             children: [],                         },                         {                              tagId: 2, // 子标签id                             childKey: [0, 1],                             label: 第0-1,                             parent: 第0,                             location: 2,                             value: 0-1,                             children: [],                         },                     ],                 },             ]         };     },     methods: {          // 递归寻找同级         findSameTable(arr, i, casArr) {              if (i == casArr.length - 1) {                  return arr;             } else {                  return this.findTable(                     arr[casArr[i].substr(casArr[i].length - 1, 1)].children,                     (i += 1),                     casArr                 );             }         },         // 寻找父级         findTable(arr, i, casArr) {              if (i == casArr.length - 1) {                  let index = casArr[i].substr(casArr[i].length - 1, 1);                 return arr[index];             } else {                  return this.findTable(                     arr[casArr[i].substr(casArr[i].length - 1, 1)].children,                     (i += 1),                     casArr                 );             }         },         // 递归表格数据(添加)         find(arr, i) {              if (i == this.casArr.length - 1) {                  return arr[this.casArr[i].substr(this.casArr[i].length - 1, 1)]                     .children;             } else {                  return this.find(                     arr[this.casArr[i].substr(this.casArr[i].length - 1, 1)]                         .children,                     (i += 1)                 );             }         },         // 递归表格数据(编辑)         findSd(arr, i, casArr) {              if (i == casArr.length - 1) {                  let index = casArr[i].substr(casArr[i].length - 1, 1);                 return arr.splice(index, 1, this.temp);             } else {                  return this.findSd(                     arr[casArr[i].substr(casArr[i].length - 1, 1)].children,                     (i += 1),                     casArr                 );             }         },         // 递归寻找同步名称         findLable(arr, i, casArr) {              if (i == casArr.length - 1) {                  let index = casArr[i].substr(casArr[i].length - 1, 1);                 return arr[index];             } else {                  return this.findLable(                     arr[casArr[i].substr(casArr[i].length - 1, 1)].children,                     (i += 1),                     casArr                 );             }         },         // 同步子名称         useChildLable(arr) {              if (arr !== []) {                  arr.forEach((item) => {                      item.parent = this.temp.label;                 });             }         },         // 递归表格数据(删除)         findDel(arr, i, item) {              let casArr = item.childKey;             if (i == casArr.length - 2) {                  let index = casArr[i].substr(casArr[i].length - 1, 1);                 arr[index].children.forEach((it, ix, arrs) => {                      if (it == item) {                          return arrs.splice(ix, 1);                     }                 });             } else {                  return this.findDel(                     arr[casArr[i].substr(casArr[i].length - 1, 1)].children,                     (i += 1),                     item                 );             }         },       // 置空         resetTemp() {              this.temp = { };         },       // 打开添加         handleCreate() {              this.resetTemp();             this.dialogFormVisible = true;             this.dialogStatus = create;             this.$nextTick(() => {                  this.$refs[dataForm].clearValidate();             });         },       // 添加         createData() {              this.$refs[dataForm].validate((valid) => {                  if (valid) {                      if (this.sonStatus == false) {                          this.temp.value = String(this.tableData.length);                         const obj = Object.assign({ }, this.temp);                         obj.children = [];                         obj.parent = ;                         this.tableData.push(obj);                         this.$message({                              type: success,                             message: 添加成功,                         });                         this.dialogFormVisible = false;                     } else {                          let arr = this.find(this.tableData, 0);                         this.temp.value =                             String(this.casArr[this.casArr.length - 1]) +                             - +                             String(arr.length);                         delete this.temp.children;                         const obj = Object.assign({ }, this.temp);                         obj.children = [];                         obj.childKey = [...this.casArr, String(arr.length)];                         obj.parent = this.findTable(                             this.tableData,                             0,                             this.casArr                         ).label;                         if (this.temp.location === 2) {                              obj.location = String(                                 [...this.casArr, String(arr.length)].length                             );                         }                         arr.push(obj);                         this.$message({                              type: success,                             message: 添加成功,                         });                         this.dialogFormVisible = false;                     }                 } else {                      return false;                 }             });         },       // 打开更新         handleUpdate(row) {              console.log(row);             row.value.length != 1                 ? (this.sonStatus = true)                 : (this.sonStatus = false);             this.temp = Object.assign({ }, row); // copy obj             if (row.childKey) {                  this.childKey = row.childKey;                 this.idx = row.childKey[row.childKey.length - 1];             } else {                  this.idx = row.value;             }             console.log(this.idx);             this.dialogStatus = update;             this.dialogFormVisible = true;             this.$nextTick(() => {                  this.$refs[dataForm].clearValidate();             });         },       // 更新         updateData() {              this.$refs[dataForm].validate((valid) => {                  if (valid) {                      if (this.temp.location === 1) {                          console.log(this.temp);                         this.tableData.splice(this.idx, 1, this.temp);                         this.useChildLable(this.tableData[this.idx].children);                         this.$message({                              type: success,                             message: 编辑成功,                         });                         this.dialogFormVisible = false;                     } else {                          this.findSd(this.tableData, 0, this.childKey);                         this.useChildLable(                             this.findLable(this.tableData, 0, this.childKey)                                 .children                         );                         this.$message({                              type: success,                             message: 编辑成功,                         });                         this.dialogFormVisible = false;                     }                 } else {                      return false;                 }             });         },         // 删除父级节点         deleteParent(item) {              this.tableData.forEach((it, ix, arrs) => {                  if (it == item) {                      return arrs.splice(ix, 1);                 }             });         },         // 删除         deleteClick(item) {              this.$confirm(`此操作将删除该标签, 是否继续?`, 提示, {                  confirmButtonText: 确定,                 cancelButtonText: 取消,                 type: warning,             })                 .then(() => {                      if (item.children.length != 0) {                          this.$message.warning({                              message: 请删除子节点,                             duration: 1000,                         });                     } else {                          ++this.isResouceShow;                         if (item.value.length == 1) {                              this.deleteParent(item);                             this.$message({                                  type: success,                                 message: 删除成功,                             });                         } else {                              this.findDel(this.tableData, 0, item);                             this.$message({                                  type: success,                                 message: 删除成功,                             });                         }                     }                 })                 .catch((err) => {                      console.log(err);                     this.$message({                          type: info,                         message: 已取消删除,                     });                 });         },         // 是否显示次位置         locationChange(v) {              if (v == 2) {                  this.sonStatus = true;             } else {                  this.sonStatus = false;             }         },         // 获取次位置         getCasVal(v) {              this.casArr = v;         },     }, }; </script> 

代码可以直接拿来用，但是要注意事先要安装下ElementUI框架。无限层级的核心算法是递归算法，掌握了这一点，任何难题都可以解决。

下面，我们就这个项目来回顾下前端中的递归算法。

递归简而言之就是函数调用自己。递归算法中有两个条件：基线条件和递归条件。基线条件用于控制递归啥时候暂停，而递归条件是控制调用自己的方式。

最简单的一个例子是5的阶乘。云服务器提供商

var func = function(i){      if(i === 1){          return 1;     }else{          return i*func(i-1);     } } func(5); 

这样就很简单的实现了一个递归算法，我们将上述例子拆解下。

// 递 5*func(4); 5*4*func(3); 5*4*3*func(2); 5*4*3*2*func(1); // 归 5*4*3*2*1; 5*4*3*2; 5*4*6; 5*24; 120 

递归其实可以理解成两个操作递与归。可以这样比喻，比如你在做一道数学题时，有一个知识点你不懂，你需要查资料。但是，通过查资料你发现这个知识点中你又有另一个不明白的知识点，你又开始继续查，直到你没有不懂的知识点，这样递的操作已经完成。然后，你把已经查过的这些知识点又从尾到头复习了一遍，这样归的操作已经完成。最后，你明白了最初那个知识点。服务器托管

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