给el-table实现列显隐

用过若依的都知道，在使用el-table 时候，实现列显隐效果是要给每个列加v-if 判断的，这种代码过于繁琐，于是翻看el-table包的代码，调试后发现内部的【插入】和【删除】两个方法可以达到我们要的效果。

项目不提供源码，核心代码都贴上了
代码动刀看似有点多，实则一个地方就一点块。el-table的源码，若依RightToolBar，本身组件，不过轮子造完都是有用的。
没有rightBar的项目可以自己对应数据模拟一个交互操作的方式来实现

上图可以看到基于若依的RightBar组件去实现列显隐，并且存到vuex的持久化中，（vuex+本地存储中），并且去掉了原先若依的RightBar组件弹窗方式。

项目是用tailwindcss 部分class类名自己去计算

RightBar的使用方法和修改内容

  <right-toolbar:showSearch.sync="showSearch"@queryTable="getList":checkTableInfo.sync="checkTableInfo"@interaction="x => (hiddenColumns = x)":componentName="$options.name"/>

<template><div class="top-right-btn" :style="style"><el-row><el-tooltip class="item" effect="dark" :content="showSearch ? '隐藏搜索' : '显示搜索'" placement="top" v-if="search"><el-button size="mini" circle icon="el-icon-search" @click="$emit('update:showSearch', !showSearch)" /></el-tooltip><el-tooltip class="item" effect="dark" content="刷新" placement="top"><el-button size="mini" circle icon="el-icon-refresh" @click="$emit('queryTable')" /></el-tooltip><el-tooltip v-if="checkTableInfo.length" class="item" effect="dark" content="显隐列" placement="bottom-start"><el-popover v-model="visible" placement="right" trigger="click"><el-checkbox-group v-model="checkList"><el-checkbox class="block" v-for="(item, index) in checkTableInfo" :disabled="item === 'selection' || item === '操作'" :key="index" :label="item" /></el-checkbox-group><el-divider class="my-4" /><div><el-button size="mini" type="primary" @click="submit">确定</el-button><el-button v-if="componentName" size="mini" @click="cancel">取消</el-button></div><el-button class="ml-2.5" slot="reference" size="mini" circle icon="el-icon-menu" /></el-popover></el-tooltip></el-row></div>
</template><script>
import { mapState, mapMutations } from 'vuex'export default {name: 'RightToolbar',data() {return {checkList: Array.from(this.checkTableInfo),visible: false,}},props: {showSearch: { type: Boolean, default: true },search: { type: Boolean, default: true },gutter: { type: Number, default: 10 },checkTableInfo: { type: Array, default: () => [] },componentName: { type: String, default: '' },},mounted() {if (this.componentName && this.tableColumns[this.componentName]) {this.tableColumns[this.componentName]?.length && (this.checkList = this.tableColumns[this.componentName])this.$emit('interaction', this.checkList)}},methods: {...mapMutations('tablecolumn', ['setTableCache']),submit() {this.$emit('interaction', this.checkList)this.visible = falseif (!this.componentName) returnthis.setTableCache({ key: [this.componentName], value: this.checkList })},cancel() {this.tableColumns[this.componentName]?.length && (this.checkList = this.tableColumns[this.componentName])},},computed: {...mapState('tablecolumn', ['tableColumns']),style() {const ret = {}if (this.gutter) {ret.marginRight = `${this.gutter / 2}px`}return ret},},
}
</script><style lang="scss" scoped>
::v-deep .el-transfer__button {border-radius: 50%;padding: 12px;display: block;margin-left: 0px;
}
::v-deep .el-transfer__button:first-child {margin-bottom: 10px;
}
</style>

主页面

给table传递props 属性checkTableInfo 属性即可 一定是包括column的所有列的label

<template><div><right-toolbar :showSearch.sync="showSearch" @queryTable="getList" :checkTableInfo.sync="checkTableInfo" @interaction="(x) => (hiddenColumns = x)" :componentName="$options.name" /><el-table ref="table" :data="table.data" v-loading="table.loading" :hiddenColumns="hiddenColumns" @selection-change="(ids) => (table.ids = ids)"><el-table-column align="center" type="selection" width="55" /><el-table-column align="center" label="类型" prop="type" /><el-table-column align="center" label="名称" prop="name" /><el-table-column align="center" label="描述信息" prop="desp" /><el-table-column align="center" label="值" prop="value" /><el-table-column align="center" label="默认值" prop="defaultValue" /><el-table-column align="center" label="操作" class-name="small-padding fixed-width"><template slot-scope="{ row, column: col }"><el-button size="mini" type="text" icon="el-icon-edit" @click="edit(row)">修改</el-button><el-button size="mini" type="text" icon="el-icon-delete" @click="del(row)">删除</el-button></template></el-table-column></el-table></div>
</template><script>
//  import {} from ''
export default {name: "Untitled-1",data() {return {showSearch: true,table: {ids: [],table: [{type: 'FilePath',name: 'probeEnforcement',desp: '文件生成路径',value: '/home/qchen/',defaultValue: '3',}],loading: false,},hiddenColumns: [],checkTableInfo: ['selection', '类型', '名称', '描述信息', '值', '默认值', '操作'],};},mounted() {},methods: {getList() {}edit(row) {}del(row) {}},//  End
};
</script><style lang="css" scoped></style>

将node_modules中将table的源码找到，打开里面的table.vue
将package里面的table源码导出,复制到components/ElementUI目录下即可修改代码，需要在main.js中覆盖element的el-table，最底下贴过一个链接有覆盖的路径

<script>
import { cloneDeep } from 'lodash-es'
//  watch 和props 里面加入下列两个属性
export default {props: {hiddenColumns: {type: Array,default: () => [],},// ... 其他props},watch: {hiddenColumns: {immediate: true,handler(value) {const { states } = this.store;const { columns, _columns } = states;requestAnimationFrame(() => {requestAnimationFrame(() => {if (!this.cache_columns || !this.cache_columns.length) {this.cache_columns = cloneDeep(columns);}if (!value.length) return;const show = this.cache_columns.filter((x) => value.includes(x.label));const hide = this.cache_columns.filter((x) => !value.includes(x.label) && x.type !== "selection");if (show.length) {const current_label = _columns.map((item) => item.label);const control_label = show.map((item) => item.label);control_label.forEach((item) => {if (!current_label.includes(item)) {const column = show.find((x) => x.label === item);this.store.commit("insertColumn", column, column.insertColumnIndex);}});}if (hide.length) {this.cache_columns.forEach((item) => {hide.forEach((ite) => {if (item.label === ite.label) {const column = _columns.find((x) => x.label === item.label);column && this.store.commit("removeColumn", column);}});});}});});},},// ... 其他监听},//  End
};
</script>

将el-table的源码找到，翻开/El-Table/store/index.js。 约30行的位置

  insertColumn(states, column, index, parent) {let array = states._columnsif (parent) {array = parent.childrenif (!array) array = parent.children = []}if (typeof index !== 'undefined') {array.splice(index, 0, column)} else {array.push(column)}if (column.type === 'selection') {states.selectable = column.selectablestates.reserveSelection = column.reserveSelection}if (!column.insertColumnIndex) { // 加入 index 标识，插入时用到column.insertColumnIndex = index}if (this.table.$ready) {this.updateColumns() // hack for dynamics insert columnthis.scheduleLayout()}},

最后将重新注册的el-table 整个文件重新注册一下，这里有操作