1. 先动态渲染表头,给每一个表头添加一个class=virtual 的画虚线的类名,同时给每个表头加上鼠标点击、拖动、抬起事件:mousedown->mousemove->mouseup.
2. 点击时确定点击的哪个,拖动的时候确定拖动的方向,抬起的时候确定放在的位置。
3. 改变数据实现拖动完成效果。
<html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0,maximum-scale=1.0, user-scalable=no" /> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>自定义表头样式和整列的拖动</title> <link rel="stylesheet" href="https://unpkg.com/element-ui@2.3.7/lib/theme-chalk/index.css"> <script src="https://cdn.bootcss.com/vue/2.5.2/vue.min.js"></script> <script src="https://unpkg.com/element-ui@2.3.7/lib/index.js"></script> <style> *{ padding:0; margin:0; } body { padding:50px; overflow-x: hidden; } .thead-cell{ position: relative; } .drag_table th { cursor: move; } .virtual { position: fixed; display: block; margin-top: -35px; margin-left: -11px; } .drag_active_left .virtual { border-left: 1px dotted #666; z-index: 99; } .drag_active_right .virtual { border-right: 1px dotted #666; z-index: 99; } /* 给选中要拖动的列添加背景色,如果在完整项目内部的组件,所以这个组件的style,不能加scoped,否则添加不上样式 如果使用了sass或者less,可以加scoped 然后在用特殊手法处理样式 */ .dragging_column { background-color: #f3f3f3 !important; } </style> </head> <body> <div id="app"> <p style="text-align:center;font-size:20px;margin-bottom:50px;">自定义表头样式和整列的拖动</p> <div @mouseleave="moveTableOutside"> <el-table class="drag_table" :data="tableData" border stripe :cell-class-name="cellClassName" :header-cell-class-name="headerCellClassName"> <el-table-column v-for="(col, index) in tableHeader" :key="index" :prop="col.prop" :label="col.label" :column-key="index.toString()" :render-header="renderHeader"> </el-table-column> </el-table> </div> </div> </body> <script> var Main = { data() { return { tableData: [{ name: ‘王小虎‘, date: ‘2016-05-02‘, address: ‘上海市普陀区金沙江路 1518 弄‘ }, { name: ‘王老五‘, date: ‘2016-05-04‘, address: ‘上海市普陀区金沙江路 1517 弄‘ }, { name: ‘王大锤‘, date: ‘2016-05-01‘, address: ‘上海市普陀区金沙江路 1519 弄‘ }, { name: ‘王小龙‘, date: ‘2016-05-03‘, address: ‘上海市普陀区金沙江路 1516 弄‘ }], tableHeader: [{ prop: ‘name‘, label: ‘姓名‘ }, { prop: ‘date‘, label: ‘时间‘ }, { prop: ‘address‘, label: ‘地址‘ }], dragState: { startIndex: -1, // 拖动起始元素的index endIndex: -1, // 拖动结束元素的index afterMoveIndex: -1, // 拖动后元素的index dragging: false, // 是否正在拖动 direction: null, // 拖动方向 moveTableOutsideBack: false // 拖出到table外之后又拖回来 } } }, methods: { // drag_table在渲染表头时调用 renderHeader(h, { column, $index }) { // 这里可以根据$index的值来对自身需求进行修改, return h(‘span‘, { ‘class‘: [‘thead-cell‘], style: { ‘display‘: ‘block‘, ‘width‘: ‘100%‘, ‘cursor‘: ‘move‘, }, on: { mousedown: ($event) => { this.handleMouseDown($event, column) }, mouseup: ($event) => { this.handleMouseUp($event, column) }, mousemove: ($event) => { this.handleMouseMove($event, column) } } }, [ h(‘span‘, [ // 给每个表头添加icon 可以不需要 h(‘span‘, { class: $index === 0 ? ‘el-icon-star-off‘ : $index === 1 ? ‘el-icon-time‘ : $index === 2 ? ‘el-icon-location‘ : ‘‘, }), h(‘span‘, column.label) ]), // 给每个表头添加一个class=virtual 是画虚线的类名。 h(‘span‘, { ‘class‘: [‘virtual‘] }) ]) }, // 按下鼠标开始拖动 设置列的背景色 handleMouseDown(e, column) { // 判断是鼠标左键 if (e.button === 0) { this.dragState.dragging = true this.dragState.startIndex = parseInt(column.columnKey) console.log(`开始移动的位置 ${this.dragState.startIndex}`) // 给当前要拖动列的th设置class document.querySelectorAll(‘.drag_table table thead tr th‘)[this.dragState.startIndex].className += ‘ ‘ + ‘dragging_column‘; // 给拖动时的虚拟容器添加宽高 let table = document.getElementsByClassName(‘drag_table‘)[0] let virtual = document.getElementsByClassName(‘virtual‘) // 设置新插入的span.virtual的标签 每一列的宽度、高度 for (let item of virtual) { item.style.height = table.clientHeight - 1 + ‘px‘ item.style.width = item.parentElement.parentElement.clientWidth + ‘px‘ } this.dragState.moveTableOutsideBack = false } }, // 拖动中 handleMouseMove(e, column) { // 判断是鼠标左键 if (e.button === 0) { if (this.dragState.dragging) { let currentIndex = parseInt(column.columnKey) // 拖动的当前列index console.log(`移动到了${currentIndex}`) if (currentIndex !== this.dragState.startIndex) { this.dragState.direction = currentIndex - this.dragState.startIndex < 0 ? ‘left‘ : ‘right‘ // 判断拖动方向 this.dragState.afterMoveIndex = currentIndex } else { this.dragState.direction = null } } else { return false } } }, // 鼠标放开结束拖动 handleMouseUp(e, column) { // 判断是鼠标左键 if (e.button === 0) { // 拖出当前table外之后又拖回来,不再进行易位操作(拖出去时已处理) if (this.dragState.moveTableOutsideBack) { return false } else { this.dragState.endIndex = parseInt(column.columnKey) // 记录结束列index console.log(`结束移动的位置 ${this.dragState.endIndex}`) if (this.dragState.startIndex !== this.dragState.endIndex) { this.dragColumn(this.dragState) } this.finishDragInit() } } }, // 拖动到当前table之外的处理 moveTableOutside() { if (this.dragState.dragging) { this.dragState.endIndex = this.dragState.startIndex console.log(`已移动到table外,结束移动的位置 ${this.dragState.endIndex}`) if (this.dragState.startIndex !== this.dragState.endIndex) { this.dragColumn(this.dragState) } this.finishDragInit() this.dragState.moveTableOutsideBack = true } }, // 拖动易位 dragColumn({ startIndex, endIndex, direction }) { console.log(`从${startIndex}移动到了${endIndex}`) // 排除掉鼠标点击table外面,然后拖入进table报错 if (startIndex < 0) { return; } // 判断是向左移动还是向右移动 // 把移动的列插在某个列前面或者后面,然后在删除移动的列 if (direction === ‘left‘) { this.tableHeader.splice(endIndex, 0, this.tableHeader[startIndex]) this.tableHeader.splice(startIndex + 1, 1) } else { this.tableHeader.splice(endIndex + 1, 0, this.tableHeader[startIndex]) this.tableHeader.splice(startIndex, 1) } }, // 拖动完成后的初始化 finishDragInit() { // 给当前要拖动列的th取消class for (var item of document.querySelectorAll(‘.drag_table table thead tr th‘)) { item.className = String(item.className).split("dragging_column").join(""); } // 再次初始化拖动状态 this.dragState = { startIndex: -1, endIndex: -1, afterMoveIndex: -1, dragging: false, direction: null, moveTableOutsideBack: false } }, // 动态给表头单元格添加 class,实现拖动中的虚线效果 /* 这个监听在table渲染的时候会执行一遍。 然后还会有两个条件会触发执行: 1. 绑定的数据发生变化的时候(即为表格内容变化就触发)。header变化触发header-cell-class-name,表格数据变化触发cell-class-name. 2. return返回值 如果绑定了data,如果此data变化也会触发执行。相当于对这个data进行了监听随之触发这个方法。 */ headerCellClassName({ column, columnIndex }) { console.log(1111111) return columnIndex === this.dragState.afterMoveIndex ? `drag_active_${this.dragState.direction}` : ‘‘ }, // 动态给表头单元格th添加class,实现拖动中的背景 cellClassName({ column, columnIndex }) { console.log(22222) return (columnIndex === this.dragState.startIndex ? `dragging_column` : ‘‘) }, }, mounted() { var that = this; setTimeout(function() { // that.tableHeader[0].label = ‘wwwwww‘; // that.tableData[0].name = ‘wwwwww‘; // console.log() // console.log(document.querySelectorAll(‘.drag_table .el-table_2_column_4‘)[0]) // document.querySelectorAll(‘.drag_table table thead tr th‘)[0].className += ‘ ‘ + ‘dragging_column‘; // that.dragState.startIndex = ‘1‘ }, 5000) } } var Ctor = Vue.extend(Main) new Ctor().$mount(‘#app‘) </script> </html>
原文地址:https://www.cnblogs.com/wangmaoling/p/10525048.html
时间: 2024-11-05 14:42:05