JS table下载

时间紧任务重推荐第一种，直接把表格整个拿过来；第二种根据表格的配置和数据进行设置

1、html下载，原生JS

downTable(name) {
        const uri = 'data:application/vnd.ms-excel;base64,',
            template = '<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns="http://www.w3.org/TR/REC-html40"><head><!--[if gte mso 9]><xml><x:ExcelWorkbook><x:ExcelWorksheets><x:ExcelWorksheet><x:Name>{worksheet}</x:Name><x:WorksheetOptions><x:DisplayGridlines/></x:WorksheetOptions></x:ExcelWorksheet></x:ExcelWorksheets></x:ExcelWorkbook></xml><![endif]--></head><body><table>{table}</table></body></html>',
            base64 = function (s) {
                return window.btoa(unescape(encodeURIComponent(s)))
            },
            format = function (s, c) {
                return s.replace(/{(\w+)}/g,
                    function (m, p) {
                        return c[p];
                    })
            }
　　　　　　//el-table表格设置列浮动，会多出一个隐藏table，需要过滤掉
        const table = document.getElementById('table')?.innerHTML.replace(/<div class="el-table__fixed".*>[\s\S]*?<\/div>/img, "");
        const ctx = {worksheet: name || 'Worksheet', table}
 
        // 通过创建a标签实现
        const link = document.createElement("a");
        link.href = uri + base64(format(template, ctx));
        // 对下载的文件命名
        link.download = name + '.xlsx';
        link.click();
    }

 

 优点：快

缺点：时间会被转义，样式会受页面CSS影响，测试反映有的电脑打开慢或文件损坏

2.1、XLSX-通过json数据转成一个worksheet对象

async downTable(type: number) {
        let tableColumn: any[] = [], tableData: any[] = [], fileName = '';
        if (type === 1) {
            tableColumn = this.trendSaleColumn;
            tableData = this.trendSaleData;
            fileName = '售前介入趋势（销售）.xlsx';
        }else if (type === 3) {
            await this.getPreSalesConvertInfo(this.transferSaleType, 1);
            tableColumn = this.transferSaleColumn;
            tableData = this.transferSaleData;
            fileName = '售前部门转化（销售）.xlsx';
        } 

        let data: any[] = [[]];
        tableColumn.forEach((item: any) => {
            data[0].push(item.label);
        })
        tableData.forEach((item: any) => {
            let row: any[] = [];
            tableColumn.forEach((column: any) => {
                row.push(item[column.prop]);
            })
            data.push(row);
        })
        const sheet = XLSX.utils.aoa_to_sheet(data);
　　　　　　//合并单元格配置，需要计算需要合并的行列数
        if (type === 3 || type === 4) {
            if (this.productType[1] > 0 && this.productType[2] > 0) {
                sheet['!merges'] = [
                    {s: {r: 1, c: 0}, e: {r: this.productType[1], c: 0}},//s表示开始，e表示结束，r表示行，c表示列；
                    {s: {r: this.productType[1] + 1, c: 0}, e: {r: this.productType[2], c: 0}}
                ];
            } else if (this.productType[1] > 0 || this.productType[2] > 0) {
                sheet['!merges'] = [
                    {s: {r: 1, c: 0}, e: {r: this.productType[1] || this.productType[2], c: 0}},//s表示开始，e表示结束，r表示行，c表示列；
                ];
            }
        }

        // 通过创建a标签实现
        const link = document.createElement("a");
        link.href = URL.createObjectURL(sheet2blob(sheet));
        // 对下载的文件命名
        link.download = fileName;
        link.click();
    }
sheet2blob(sheet: any, sheetName: string = 'sheet1') {
        const workbook: any = {
            SheetNames: [sheetName],
            Sheets: {}
        };
        workbook.Sheets[sheetName] = sheet;
        // 生成excel的配置项
        const wopts: any = {
            bookType: 'xlsx', // 要生成的文件类型
            bookSST: false, // 是否生成Shared String Table，官方解释是，如果开启生成速度会下降，但在低版本IOS设备上有更好的兼容性
            type: 'binary'
        };
        const wbout = XLSX.write(workbook, wopts);
        const blob = new Blob([s2ab(wbout)], {type: "application/octet-stream"});

        // 字符串转ArrayBuffer
        function s2ab(s: any) {
            const buf = new ArrayBuffer(s.length);
            const view = new Uint8Array(buf);
            for (let i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
            return buf;
        }

        return blob;
    }

 

 优点：单元格内容可控，可以设置单元合并等XLSX支持的配置

缺点：复杂表格需要计算合并单元格的位置和数量，比如多级表头

 

2.2、XLSX-把页面上已有的表格dom节点传入

downTable() {
        const table = document.getElementById('table')?.innerHTML.replace(/<div class="el-table__fixed".*>[\s\S]*?<\/div>/img, "");
        const tableDom = document.createElement('div');
        tableDom.innerHTML = table;
        let ws = XLSX.utils.table_to_sheet(tableDom)
        //创建一个workbook对象
        let wb = XLSX.utils.book_new()
        //把worksheet对象添加进workbook对象，第三个参数是excel中sheet的名字
        XLSX.utils.book_append_sheet(wb, ws, 'sheet1')
        //接下来就是写入，下载导出
        let wb_out = XLSX.write(wb, {bookType: 'xlsx', type: 'binary'})
        const blob = new Blob([s2ab(wb_out)], {type: "application/octet-stream"});

        // 字符串转ArrayBuffer
        function s2ab(s: any) {
            const buf = new ArrayBuffer(s.length);
            const view = new Uint8Array(buf);
            for (let i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
            return buf;
        }

        // 通过创建a标签实现
        const link = document.createElement("a");
        link.href = URL.createObjectURL(blob);
        // 对下载的文件命名
        link.download = this.title + '.xlsx';
        link.click();
}

 

posted @ 2023-02-15 16:42  Jade_g  阅读(235)  评论(0)  编辑  收藏  举报