easyui导出当前datagrid数据（含表头）

Posted 2020-10-12 沐_沐

JS代码

//导出当前DataGrid数据
function doExportCommon() {
    var list = getCheckedRowCommon();
    var exportList = [];
    if (list.length <= 0) {
        showMessage("请至少勾选一条数据");
        return;
    }

    var titleList = JSON.parse(getGridTitle());
    exportList.push(titleList);
    for (var i = 0; i < list.length; i++) {
        var row = list[i];
        var rowStr = "{";
        //这里通过字段去匹配相应的行的数据
        for (var field in titleList) {
            var str = row[field];
            if (str) {
                while (str.toString().indexOf(‘\n‘) > 0) {
                    str = str.replace(‘\n‘, "<br>");　　
                }
            } else { str = ""; }
            rowStr += "\"" + field + "\":\"" + str + "\","; //过滤换行符
        }
        rowStr = rowStr.substr(0, rowStr.length - 1);
        rowStr += "}";
        exportList.push(JSON.parse(rowStr));
    }
    var strhtml = JSON.stringify(exportList);
    //调用后台导出方法
    callbackObj.showExportMsg(strhtml);
}

//该方法为自定义勾选框时，根据已勾选的勾选框获取行的数据
//获取勾选行，返回勾选行数据
function getCheckedRowCommon() {
    var data = $(‘#table‘).datagrid(‘getRows‘);
    var checkitems=$("#table_div input[name=‘checkItem‘]:checkbox:checked");
    var rowList = [];
    for (var i = 0; i < checkitems.length; i++) {
        var rowTr = checkitems[i].parentElement.parentElement.parentElement;
        var selectIndex = $(rowTr).attr("datagrid-row-index");
        rowList.push(data[selectIndex]);
    }
    return rowList;
}

//这里返回的是字段名称和表头文字的键值对
//根据datagrid显示的表头，获取文字
function getGridTitle() {
    var titlename = "{";
    var fields = $(‘#table‘).datagrid(‘getColumnFields‘);
    for (var i = 0; i < fields.length; i++) {
        var option = $(‘#table‘).datagrid(‘getColumnOption‘, fields[i]);
        if (option.field != "checkItem" && option.hidden != true) { //过滤勾选框和隐藏列
            titlename += "\"" + option.field + "\":\"" + option.title + "\",";
        }
    }
    titlename = titlename.substr(0, titlename.length - 1);
    titlename += "}";
    return titlename;
}

 后台导出方法（winform）

 这里应用到Aspose.Cells用来读写Excel

public class CallbackObjectForJs
{
        public MainForm mainForm;    //主页面

        public void exportExcel(string data)
        {
            string saveFileName = "";
            SaveFileDialog saveDialog = new SaveFileDialog();
            saveDialog.DefaultExt = "xlsx";
            saveDialog.Filter = "Excel文件|*.xlsx";
            saveDialog.FileName = DateTime.Now.Ticks.ToString();
            saveDialog.ShowDialog();
            saveFileName = saveDialog.FileName;
            if (saveFileName.IndexOf(":") < 0) return; //被点了取消

            Workbook wb = new Workbook(FileFormatType.Xlsx);
            try
            {
                Worksheet sheet = wb.Worksheets[0];
                sheet.Name = "Sheet1";
                // 为单元格添加样式
                Aspose.Cells.Style style = wb.CreateStyle();
                style.HorizontalAlignment = TextAlignmentType.Center;  //设置居中
                style.IsTextWrapped = true;     //设置自动换行
                //style.Font.Size = 12;//文字大小
                //style.Font.IsBold = true;//粗体

                DataTable dt = JsonConvert.DeserializeObject<DataTable>(data);
                //遍历DataTable
                for (int i = 0; i < dt.Rows.Count; i++) //行
                {
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        string value = dt.Rows[i][j].ToString();
                        while (value.Contains("<br>"))
                        {
                            value = value.Replace("<br>", "\n");
                        }
                        sheet.Cells[i, j].PutValue(value);
                        sheet.Cells[i, j].SetStyle(style);
                    }
                }
                //设置宽度、高度自适应
                setColumnWithAuto(sheet);
                wb.Save(saveFileName, new OoxmlSaveOptions(Aspose.Cells.SaveFormat.Xlsx));
               
                //通过Invoke激活主线程，弹出框置顶。
                mainForm.Invoke(new MethodInvoker(delegate
                {
                    MessageBox.Show(mainForm, "导出成功");
                }));
            }
            catch (Exception e)
            {
                MessageBox.Show(e.Message.ToString());
                return;
            }
        }    

        /// <summary>
        /// 设置表页的列宽度自适应
        /// </summary>
        /// <param name="sheet">worksheet对象</param>
        public void setColumnWithAuto(Worksheet sheet)
        {
            Cells cells = sheet.Cells;
            int columnCount = cells.MaxColumn + 1;  //获取表页的最大列数
            int rowCount = cells.MaxRow;        //获取表页的最大行数

            sheet.AutoFitRows();    //设置行高自适应
            for (int col = 0; col < columnCount; col++)
            {
                sheet.AutoFitColumn(col, 0, rowCount);
            }
            for (int col = 0; col < columnCount; col++)
            {
                cells.SetColumnWidthPixel(col, cells.GetColumnWidthPixel(col) + 30);
            }
        }
}