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实现思路: 项目有两个需求,既能在el-table实现点选又能实现鼠标框选

一. 点选实现思路: 使用el-table的cellClick方法,

        1.直接给点击的cell添加类名,cell.classList.add("blue-cell");然后把获取的数据存入数组,

           设置样式:

::v-deep .el-table td.blue-cell {border: 1px solid blue !important;
}

     方法2.如果不添加类名,可以在cellStyle方法里通过存储的数组添加边框,如果是普通滚动可以使用行索引,如果是虚拟滚动,这里需要使用id更为准确

cellStyle({ row, column, rowIndex, columnIndex }) {// 对xqArr选择选区的单元格加蓝边框let matchObj = this.xqArr.find(item =>item.column === column.index &&// item.row === row.index &&item.rowId === row.id &&item.sampleTime === row.sampleTime);if (matchObj) {return { border: "1px solid #5E99FD" };}
}

二.鼠标框选实现思路: 利用鼠标按下和抬起事件,计算框的范围,框住的cell可以通过类名添加边框或者依然通过数组形式. 需要注意的是因为el-table在页面的右下方,并且数据量大,可以滚动,所以需要在计算距离的时候需要减去容器偏移的距离和滚动的高度.

              <el-tableborder:lazy="true"v-loading="loading"@cell-click="cellClick":cell-class-name="tableCellClassName"@row-contextmenu="rightClick"@row-click="clickTableRow"@mousedown.native="down($event)"@mousemove.native="move($event)"@mouseup.native="up($event)":data="historyDataTables":highlight-current-row="true":stripe="true":header-cell-style="{background: '#cff7ff',fontWeight: 'bold',color: '#080809'}":row-height="30":total="totalCount":cell-style="cellStyle":max-height="maxHeight1"@selection-change="handleSelectionChange"ref="multipleTable":row-key="row => row.id"id="table">

<script>export default {data() {return {// 列表集合historyDataTables: [],select: false,isMouseDown: true, // 是否需要(允许)处理鼠标的移动事件// 定义移动元素divrect: null,// 记录鼠标按下时的坐标downX: 0,downY: 0,// 记录鼠标抬起时候的坐标mouseX2: this.downX,mouseY2: this.downY,// 表格dom元素TableDom: null,tableHeaderHeight: 0,selectedData: [], // 鼠标框选选中的数据selectedCellTop: 0, // 选中单元格距离el-table顶部的距离selectedCellLeft: 0, // 选中单元格距离el-table左侧的距离tableRectTop: 0, // el-table距离window顶部的距离tableRectLeft: 0, // el-table距离window左侧的距离tableScrollTop: 0, // el-table滚动的距离}},mounted() {this.TableDom = this.$refs.multipleTable.$el; // 获取table元素// 获取table的位置,监听窗口变化,table的距离变化this.getTableMarginLeft();window.addEventListener("resize", this.getTableMarginLeft);this.clientWidth =document.documentElement.clientWidth || document.body.clientWidth;this.clientHeight =document.documentElement.clientHeight || document.body.cientHeight;this.otherHeight =Math.ceil($(".is-always-shadow").outerHeight()) +Math.ceil($(".is-top").outerHeight());this.maxHeight1 = this.clientHeight - this.otherHeight - 150 + "px";var that = this;window.onresize = () => {return (() => {window.clientHeight =document.documentElement.clientHeight || document.body.clientHeight;that.clientHeight = window.clientHeight;})();};},beforeDestroy() {window.removeEventListener("resize", this.getTableMarginLeft);},methods: {// 获取table距离页面左侧和上方的距离getTableMarginLeft() {const tableRect = this.TableDom.getBoundingClientRect(); // 获取el-table元素的位置信息this.tableRectTop = Math.ceil(tableRect.top);this.tableRectLeft = Math.ceil(tableRect.left);},down(event) {// 当允许鼠标按下时,才允许处理鼠标的移动事件,这里结合项目其他问题所以设置了判断条件if (this.isMouseDown) {this.select = true;this.rect = document.createElement("div");// 框选div 样式this.rect.style.cssText ="position:absolute;width:0px;height:0px;font-size:0px;margin:0px;padding:0px;border:1px solid #0099FF;background-color:#C3D5ED;z-index:1000;filter:alpha(opacity:60);opacity:0.6;display:none;";this.rect.id = "selectDiv";this.getTableMarginLeft();const container = document.querySelector(".el-table__body-wrapper"); // 获取table容器元素this.TableDom.appendChild(this.rect); // 添加到table元素下// 取得鼠标按下时的坐标位置this.downX =event.x || event.clientX + container.scrollLeft - this.tableRectLeft; // 鼠标按下时的x轴坐标 event.x 兼容火狐浏览器, event.clientX 兼容谷歌浏览器this.downY =event.y || event.clientY + container.scrollTop - this.tableRectTop; // 鼠标按下时的y轴坐标this.rect.style.left = this.downX + "px"; // 设置你要画的矩形框的起点位置this.rect.style.top = this.downY + "px"; // 设置你要画的矩形框的起点位置//设置你要画的矩形框的起点位置this.rect.style.left = this.downX; // 因为在火狐浏览器下,上面的代码不起作用,所以在这里再写一遍，为什么火狐浏览器不起作用,因为火狐浏览器下,我们的div是绝对定位的,所以我们要加上px，为什么这里没加px,因为我们下面要加上px,所以这里不用加this.rect.style.top = this.downY;} else {return;}},move(event) {/*这个部分,根据你鼠标按下的位置,和你拉框时鼠标松开的位置关系,可以把区域分为四个部分,根据四个部分的不同,我们可以分别来画框,否则的话,就只能向一个方向画框,也就是点的右下方画框.*/if (this.select && this.isMouseDown) {// 取得鼠标移动时的坐标位置this.mouseX2 = event.clientX; // 鼠标移动时的x轴坐标this.mouseY2 = event.clientY; // 鼠标移动时的y轴坐标// 框选元素的显示与隐藏if (this.rect.style.display == "none") {this.rect.style.display = "";}// 框选元素的位置处理this.rect.style.left =Math.min(this.mouseX2, this.downX) - this.tableRectLeft + "px";this.rect.style.top =Math.min(this.mouseY2, this.downY) - this.tableRectTop + "px"; // 取得鼠标拉框时的起点坐标this.rect.style.width = Math.abs(this.mouseX2 - this.downX) + "px"; // 取得鼠标拉框时的宽度this.rect.style.height = Math.abs(this.mouseY2 - this.downY) + "px"; // 取得鼠标拉框时的高度// A partif (this.mouseX2 < this.downX && this.mouseY2 < this.downY) {this.rect.style.left = this.mouseX2 + this.tableRectLeft;this.rect.style.top = this.mouseY2 + this.tableRectTop;}// B partif (this.mouseX2 > this.downX && this.mouseY2 < this.downY) {this.rect.style.left = this.downX + this.tableRectLeft;this.rect.style.top = this.mouseY2 + this.tableRectTop;}// C partif (this.mouseX2 < this.downX && this.mouseY2 > this.downY) {this.rect.style.left = this.mouseX2 + this.tableRectLeft;this.rect.style.top = this.downY + this.tableRectTop;}// D partif (this.mouseX2 > this.downX && this.mouseY2 > this.downY) {this.rect.style.left = this.downX + this.tableRectLeft;this.rect.style.top = this.downY + this.tableRectTop;}} else {return;}this.stopEvent(event);},// 阻止默认事件stopEvent(event) {if (event.stopPropagation) {// 标准浏览器event.stopPropagation(); // 阻止事件冒泡event.preventDefault(); // 阻止默认事件} else {// IE浏览器event.cancelBubble = true;event.returnValue = false;}},// 鼠标抬起事件up() {if (this.select && this.isMouseDown) {const container = document.querySelector(".el-table__body-wrapper"); // 获取table容器元素const scrollTop = container.scrollTop; // 获取el-table的scrollTop和scrollLeftconst scrollLeft = container.scrollLeft;const headerWrapper = this.TableDom.querySelector(".el-table__header-wrapper");const tableHeaderHeight = Math.ceil(headerWrapper.getBoundingClientRect().height);const columns = this.$refs.multipleTable.columns; // 表格的标题const rectLeft = this.rect.offsetLeft + scrollLeft - this.tableRectLeft;const rectTop =this.rect.offsetTop +scrollTop -this.tableRectTop -tableHeaderHeight;const tableBody = document.querySelector(".el-table__body");tableBody.children[1].childNodes.forEach(element => {for (let index = 0; index < element.childNodes.length; index++) {// 获取当前单元格const cell = element.childNodes[index];if (// 判断选中的单元格是否在鼠标拉框的范围内rectLeft <cell.offsetLeft - this.tableRectLeft + cell.offsetWidth &&rectLeft + this.rect.offsetWidth >cell.offsetLeft - this.tableRectLeft &&rectTop <cell.offsetTop - this.tableRectTop + cell.offsetHeight &&rectTop + this.rect.offsetHeight >cell.offsetTop - this.tableRectTop &&index >= 3 // 选中的单元格所在列的索引大于等于3) {if (cell.className.indexOf("add") == -1) {// cell.style.border = "1px solid red";const cellText = cell.innerText;const rowData = this.historyDataTables[element.rowIndex]; // 获取当前单元格所在的行数据// 获取表格的列名的属性名propertylet columnProperty = undefined;// 遍历第一行数据// console.log(index, '--index--'); // 框选数据所在列的索引for (const item of columns) {if (item.index === index) {columnProperty = item.property;break;}}// const rowIndex = element.rowIndex; // 将当前单元格所在的行数据加入到该列数据中const columnIndex = index;const time = rowData.sampleTime;// 选择要添加到选中行数组中的属性const selected = {rowId: rowData.id,// row: rowIndex,column: columnIndex,sampleTime: time,factor: columnProperty,tag: rowData[columnProperty + "_tag"] || "",tagStatus: rowData[columnProperty + "_tag_status"] || "",mark: rowData[columnProperty + "_mark"] || ""};// 将选中数据加入到状态中已有的数据中,如果已有相同的数据，则不加入if (!this.selectedData.some(data => this.isEqual(data, selected))) {this.selectedData.push(selected);}// 将选中数据加入到 xqArr 中this.selectedData.forEach(item => {// 如果 xqArr 中已有相同数据，则不加入if (!this.xqArr.some(data => this.isEqual(data, item))) {this.xqArr.push(item);}});this.selectedData = [];}}}});//鼠标抬起,就不允许在处理鼠标移动事件this.select = false;//隐藏图层if (this.rect) {this.TableDom.removeChild(this.rect);}} else {return;}},// 定义方法 isEqual 来比较两个选中数据对象是否相同isEqual(data1, data2) {return (data1.rowId === data2.rowId &&data1.column === data2.column &&data1.sampleTime === data2.sampleTime &&data1.factor === data2.factor);}}
}