ElementUI制作树形表组件

Posted 淡烘糕

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提要

最近项目中需要用到树形表格来描述部门、区域之间的父子展开关系。但是已经在项目中使用的Vue的成熟组件ElementUI以及iViewUI组件都没有提供相应的树形表格组件,无奈找了其他替代方案也都被pass掉了,只能从改造现有组件放面着手。

在网上也找到了一些实践案例:http://blog.csdn.net/s8460049/article/details/61414751

第一种方案

第一种方案就是原作者介绍的,即将具有层级关系的数据进行提前处理。比如: 数据结构为:

[
    {
        id: 1,
        parentId: 0,
        name: \'测试1\',
        age: 18,
        sex: \'男\',
        children: [
            {
                id: 2,
                parentId: 1,
                name: \'测试2\',
                age: 22,
                sex: \'男\'
            }
        ]
    },
    {
        id: 3,
        parentId: 0,
        name: \'测试3\',
        age: 23,
        sex: \'女\',
        children: [
            {
                id: 4,
                parentId: 3,
                name: \'测试4\',
                age: 22,
                sex: \'男\'
            },
            {
                id: 5,
                parentId: 3,
                name: \'测试5\',
                age: 25,
                sex: \'男\'
            },
            {
                id: 6,
                parentId: 3,
                name: \'测试6\',
                age: 26,
                sex: \'女\',
                children: [
                    {
                        id: 7,
                        parentId: 6,
                        name: \'测试7\',
                        age: 27,
                        sex: \'男\'
                    }
                ]
            }
        ]
    },
    {
        id: 18,
        parentId: 0,
        name: \'测试8\',
        age: 18,
        sex: \'男\'
    }
]

这样可以通过数据转换方法,把每一条数据从它的父级中取出来,把树形结构数据转换成数组数据。

dataTranslate.js内容:

import Vue from \'vue\'  
function DataTransfer (data) {  
  if (!(this instanceof DataTransfer)) {  
    return new DataTransfer(data, null, null)  
  }  
}  
  
  
DataTransfer.treeToArray = function (data, parent, level, expandedAll) {  
  let tmp = []  
  Array.from(data).forEach(function (record) {  
    if (record._expanded === undefined) {  
      Vue.set(record, \'_expanded\', expandedAll)  
    }  
    if (parent) {  
      Vue.set(record, \'_parent\', parent)  
    }  
    let _level = 0  
    if (level !== undefined && level !== null) {  
      _level = level + 1  
    }  
    Vue.set(record, \'_level\', _level)  
    tmp.push(record)  
    if (record.children && record.children.length > 0) {  
      let children = DataTransfer.treeToArray(record.children, record, _level, expandedAll)  
      tmp = tmp.concat(children)  
    }  
  })  
  return tmp  
}  
  
  
export default DataTransfer

有了进行数据转换的方法之后,开始正式些数据TreeGrid.vue组件:

<template>  
  <el-table  
    :data="data"  
    border  
    style="width: 100%"  
    :row-style="showTr">  
    <el-table-column v-for="(column, index) in columns" :key="column.dataIndex"  
      :label="column.text">  
      <template scope="scope">  
        <span v-if="spaceIconShow(index)" v-for="(space, levelIndex) in scope.row._level" class="ms-tree-space"></span>  
        <button class="button is-outlined is-primary is-small" v-if="toggleIconShow(index,scope.row)" @click="toggle(scope.$index)">  
          <i v-if="!scope.row._expanded" class="el-icon-caret-right" aria-hidden="true"></i>  
          <i v-if="scope.row._expanded" class="el-icon-caret-bottom" aria-hidden="true"></i>  
        </button>  
        <span v-else-if="index===0" class="ms-tree-space"></span>  
        {{scope.row[column.dataIndex]}}  
      </template>  
    </el-table-column>  
    <el-table-column label="操作" v-if="treeType === \'normal\'" width="260">  
      <template scope="scope">  
        <button type="button" class="el-button el-button--default el-button--small">  
          <router-link  
            :to="{ path: requestUrl + \'edit\', query: {id: scope.row.Oid} }"  
            tag="span">  
            编辑  
          </router-link>  
        </button>  
        <el-button  
          size="small"  
          type="danger"  
          @click="handleDelete()">  
          删除  
        </el-button>  
        <button type="button" class="el-button el-button--success el-button--small">  
          <router-link :to="{ path: requestUrl, query: {parentId: scope.row.parentOId} }"  
                       tag="span">  
            添加下级树结构  
          </router-link>  
        </button>  
      </template>  
    </el-table-column>  
  </el-table>  
</template>  
<script>  
  import DataTransfer from \'../utils/dataTranslate.js\'  
  import Vue from \'vue\'  
  export default {  
    name: \'tree-grid\',  
    props: {  
// 该属性是确认父组件传过来的数据是否已经是树形结构了,如果是,则不需要进行树形格式化  
      treeStructure: {  
        type: Boolean,  
        default: function () {  
          return false  
        }  
      },  
// 这是相应的字段展示  
      columns: {  
        type: Array,  
        default: function () {  
          return []  
        }  
      },  
// 这是数据源  
      dataSource: {  
        type: Array,  
        default: function () {  
          return []  
        }  
      },  
// 这个作用是根据自己需求来的,比如在操作中涉及相关按钮编辑,删除等,需要向服务端发送请求,则可以把url传过来  
      requestUrl: {  
        type: String,  
        default: function () {  
          return \'\'  
        }  
      },  
// 这个是是否展示操作列  
      treeType: {  
        type: String,  
        default: function () {  
          return \'normal\'  
        }  
      },  
// 是否默认展开所有树  
      defaultExpandAll: {  
        type: Boolean,  
        default: function () {  
          return false  
        }  
      }  
    },  
    data () {  
      return {}  
    },  
    computed: {  
    // 格式化数据源  
      data: function () {  
        let me = this  
        if (me.treeStructure) {  
          let data = DataTransfer.treeToArray(me.dataSource, null, null, me.defaultExpandAll)  
          console.log(data)  
          return data  
        }  
        return me.dataSource  
      }  
    },  
    methods: {  
    // 显示行  
      showTr: function (row, index) {  
        let show = (row._parent ? (row._parent._expanded && row._parent._show) : true)  
        row._show = show  
        return show ? \'\' : \'display:none;\'  
      },  
    // 展开下级  
      toggle: function (trIndex) {  
        let me = this  
        let record = me.data[trIndex]  
        record._expanded = !record._expanded  
      },  
    // 显示层级关系的空格和图标  
      spaceIconShow (index) {  
        let me = this  
        if (me.treeStructure && index === 0) {  
          return true  
        }  
        return false  
      },  
    // 点击展开和关闭的时候,图标的切换  
      toggleIconShow (index, record) {  
        let me = this  
        if (me.treeStructure && index === 0 && record.children && record.children.length > 0) {  
          return true  
        }  
        return false  
      },  
      handleDelete () {  
        this.$confirm(\'此操作将永久删除该记录, 是否继续?\', \'提示\', {  
          confirmButtonText: \'确定\',  
          cancelButtonText: \'取消\',  
          type: \'error\'  
        }).then(() => {  
          this.$message({  
            type: \'success\',  
            message: \'删除成功!\'  
          })  
        }).catch(() => {  
          this.$message({  
            type: \'info\',  
            message: \'已取消删除\'  
          })  
        })  
      }  
    }  
  }  
</script>  
<style scoped>  
  .ms-tree-space{position: relative;  
    top: 1px;  
    display: inline-block;  
    font-family: \'Glyphicons Halflings\';  
    font-style: normal;  
    font-weight: 400;  
    line-height: 1;  
    width: 18px;  
    height: 14px;}  
  .ms-tree-space::before{content: ""}  
  table td{  
    line-height: 26px;  
  }  
</style>

写好了树形表格组件,使用方式和普通的Vue组件使用方法相同:

<template>  
  <div class="hello">  
    <tree-grid :columns="columns" :tree-structure="true" :data-source="dataSource"></tree-grid>  
  </div>  
</template>  
  
<script>  
import {TreeGrid} from \'./TreeGrid\'  
export default {  
  name: \'hello\',  
  data () {  
    return {  
      columns: [  
          {  
            text: \'姓名\',  
            dataIndex: \'name\'  
          },  
          {  
            text: \'年龄\',  
            dataIndex: \'age\'  
          },  
          {  
            text: \'性别\',  
            dataIndex: \'sex\'  
          }  
        ],  
      dataSource: [  
        {  
          id: 1,  
          parentId: 0,  
          name: \'测试1\',  
          age: 18,  
          sex: \'男\',  
          children: [  
            {  
              id: 2,  
              parentId: 1,  
              name: \'测试2\',  
              age: 22,  
              sex: \'男\'  
            }  
          ]  
        },  
        {  
          id: 3,  
          parentId: 0,  
          name: \'测试3\',  
          age: 23,  
          sex: \'女\',  
          children: [  
            {  
              id: 4,  
              parentId: 3,  
              name: \'测试4\',  
              age: 22,  
              sex: \'男\'  
            },  
            {  
              id: 5,  
              parentId: 3,  
              name: \'测试5\',  
              age: 25,  
              sex: \'男\'  
            },  
            {  
              id: 6,  
              parentId: 3,  
              name: \'测试6\',  
              age: 26,  
              sex: \'女\',  
              children: [  
                {  
                  id: 7,  
                  parentId: 6,  
                  name: \'测试7\',  
                  age: 27,  
                  sex: \'男\'  
                }  
              ]  
            }  
          ]  
        },  
        {  
          id: 18,  
          parentId: 0,  
          name: \'测试8\',  
          age: 18,  
          sex: \'男\'  
        }  
      ]  
    }  
  },  
  components: {  
    TreeGrid  
  }  
}  
</script>

以上就是实现树形表格的方法,提前把树形表格数据处理成数组数据,然后针对父级和子集分别增加不同的表示,以实现不同的表格首行显示效果。

 

但是,该组件将说有数据都加在到Table中,然后采用操作css样式"display:none"的方式进行隐藏和显示。数量比较时候倒是可以完全满足使用,但是如果数据量超过100条或者更多就会出现页面卡顿的现象。

第二种方式

第二种方式在原方法的基础上进行操作,原理就是基于MVVM框架vue的数据驱动原理。采用操作数据的方式执行子级数据的显示隐藏。

根据ElementUI 的 Table组件会根据数据变化进行加载的原理,通过只传入需要展示的数据的方式,来提高浏览器渲染的速度。

直接上代码TreeGrid.vue:

<template>
    <div class="table-content">
        <el-table
            :data="TableDate"
            border
            style="width: 18.82rem">
            <el-table-column
              label="部门名称"
              min-width="400">
              <template scope="scope">
                  <span v-for="(space, levelIndex) in scope.row._level" :key="levelIndex" class="ms-tree-space"></span>
                  <span class="button is-outlined is-primary is-small" v-if="toggleIconShow(scope.row)" @click="toggle(scope.row)">
                      <i v-if="!scope.row._expanded" class="el-icon-arrow-right" aria-hidden="true"></i>
                      <i v-if="scope.row._expanded" class="el-icon-arrow-down" aria-hidden="true"></i>
                  </span>
                  <span v-else class="ms-tree-space"></span>
                  <span :title="scope.row.dpmName">
                      {{ scope.row.dpmName }}
                  </span>
              </template>
            </el-table-column>
            <el-table-column
              label="组织机构代码"
              min-width="300">
              <template scope="scope">
                  <span :title="scope.row.dpmAdc">
                      {{ scope.row.dpmAdc }}
                  </span>
              </template>
            </el-table-column>
            <el-table-column
              label="所属地区"
              min-width="300">
              <template scope="scope">
                  <span :title="scope.row.areaName">
                      {{ scope.row.areaName }}
                  </span>
              </template>
            </el-table-column>
            <el-table-column
              label="上级部门"
              min-width="315">
              <template scope="scope">
                  <span :title="scope.row.parentName">
                      {{ scope.row.parentName }}
                  </span>
              </template>
            </el-table-column>
        </el-table>
    </div>
</template>

<script>
    import {deepCopy} from "../utils/util.js"
    Array.prototype.removeByValue = function(val) {
        //对数组原型添加删除指定项的方法
        for(var i=0; i<this.length; i++) {
            if(this[i] == val) {
                this.splice(i, 1);
                break;
            }
        }
    };
    export default {
        name: \'TreeGrid\',
        components: {
            
        },
        data(){
            return {
                TableDate:[]
            }
        },
        computed:{
            allData(){
                let me = this;
                let newData = deepCopy(me.$store.getters.Data);
                return newData;
            }
        },
        watch: {
            allData(val){
                this.TableDate = deepCopy(val);
            }
        },
        methods: {
            toggleIconShow (record) {
                /**
                 * 点击展开和关闭的时候,图标的切换
                 */
                let me = this;
                if (record.children && record.children.length > 0) {
                    return true
                }
                return false
            },
            toggle(rowData) {
                let me = this;
                /**
                 * 展开下级
                 */
                let childLen = rowData.children.length;
                if(rowData._expanded){
                    let dataArr=[];
                    dataArr.push(rowData);
                    let arr = me.getChildFlowId(dataArr,[]);
                    for(let i=0; i < childLen; i++){
                        me.TableDate.map((value)=>{
                            if(arr.indexOf(value.parentId) > -1){
                                me.TableDate.removeByValue(value);
                            }
                        });
                    }
                } else {
                    rowData.children = me.setSpaceIcon(rowData.children,rowData._level);
                    let index = me.TableDate.indexOf(rowData);
                    let pre = me.TableDate.slice(0,index+1);
                    let last = me.TableDate.slice(index+1);
                    let concatChildren = pre.concat(rowData.children);
                    me.TableDate = concatChildren.concat(last);
                }
                rowData._expanded = !rowData._expanded;
            },
            getChildFlowId(data,emptyArr){
                // 获取子级的flowId
                let me = this;
                Array.from(data).forEach((record)=>{
                    emptyArr.push(record.flowId);
                    if(record.children&&record.children.length > 0){
                        let childFlowIdArr = me.getChildFlowId(record.children,emptyArr);
                        emptyArr.concat(childFlowIdArr);
                    }
                });
                return emptyArr;
            },
            setSpaceIcon(data,level){
                // 设置第一列的空格和方向按钮
                let me = this;
                let _level = 0;
                data.forEach((value)=>{
                    value._expanded = false;
                    if(level !== undefined && level !== null){
                        _level = level + 1;
                    } else {
                        _level = 1;
                    }
                    value._level = _level;
                    if(value.children&&value.children.length > 0){
                        me.setSpaceIcon(value.children, _level);
                    }
                });
                return data;
            }
        }
    }
</script>

虽然上了大段的代码,不过也有很多不细致的地方。重点还是理解实现的方式,尽量减少需要写个方法或者组件的时候,在网上Google一下就拿过来用,更多的应该是理解其中的原理,并且自己进行实践才能进步。

不明白的地方,欢迎提问交流!

 

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