新手学EasyUI----DataGrid 导出 Excel

最近做的安防项目有个功能，需要把DataGrid中的数据导出，下面通过代码一步一步的介绍;
首先在js中写一个扩展类，主要的功能是把DataGrid中的数据转换成Excel的XML格式

‘‘‘将datagrid中的数据转换成Excel的XML格式‘‘‘

$.extend($.fn.datagrid.methods, {
    getExcelXml: function (jq, param) {
        var worksheet = this.createWorksheet(jq, param);
        //alert($(jq).datagrid(‘getColumnFields‘));
        var totalWidth = 0;
        var cfs = $(jq).datagrid(‘getColumnFields‘);
        for (var i = 0; i < cfs.length; i++) {
            totalWidth += $(jq).datagrid(‘getColumnOption‘, cfs[i]).width;
        }
        //var totalWidth = this.getColumnModel().getTotalWidth(includeHidden);
        return ‘<xml version="1.0" encoding="utf-8">‘ +
            ‘<ss:Workbook xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:o="urn:schemas-microsoft-com:office:office">‘ +
            ‘<o:DocumentProperties><o:Title>‘ + param.title + ‘</o:Title></o:DocumentProperties>‘ +
            ‘<ss:ExcelWorkbook>‘ +
            ‘<ss:WindowHeight>‘ + worksheet.height + ‘</ss:WindowHeight>‘ +
            ‘<ss:WindowWidth>‘ + worksheet.width + ‘</ss:WindowWidth>‘ +
            ‘<ss:ProtectStructure>False</ss:ProtectStructure>‘ +
            ‘<ss:ProtectWindows>False</ss:ProtectWindows>‘ +
            ‘</ss:ExcelWorkbook>‘ +
            ‘<ss:Styles>‘ +
            ‘<ss:Style ss:ID="Default">‘ +
            ‘<ss:Alignment ss:Vertical="Top"  />‘ +
            ‘<ss:Font ss:FontName="arial" ss:Size="10" />‘ +
            ‘<ss:Borders>‘ +
            ‘<ss:Border  ss:Weight="1" ss:LineStyle="Continuous" ss:Position="Top" />‘ +
            ‘<ss:Border  ss:Weight="1" ss:LineStyle="Continuous" ss:Position="Bottom" />‘ +
            ‘<ss:Border  ss:Weight="1" ss:LineStyle="Continuous" ss:Position="Left" />‘ +
            ‘<ss:Border ss:Weight="1" ss:LineStyle="Continuous" ss:Position="Right" />‘ +
            ‘</ss:Borders>‘ +
            ‘<ss:Interior />‘ +
            ‘<ss:NumberFormat />‘ +
            ‘<ss:Protection />‘ +
            ‘</ss:Style>‘ +
            ‘<ss:Style ss:ID="title">‘ +
            ‘<ss:Borders />‘ +
            ‘<ss:Font />‘ +
            ‘<ss:Alignment  ss:Vertical="Center" ss:Horizontal="Center" />‘ +
            ‘<ss:NumberFormat ss:Format="@" />‘ +
            ‘</ss:Style>‘ +
            ‘<ss:Style ss:ID="headercell">‘ +
            ‘<ss:Font ss:Bold="1" ss:Size="10" />‘ +
            ‘<ss:Alignment  ss:Horizontal="Center" />‘ +
            ‘<ss:Interior ss:Pattern="Solid"  />‘ +
            ‘</ss:Style>‘ +
            ‘<ss:Style ss:ID="even">‘ +
            ‘<ss:Interior ss:Pattern="Solid"  />‘ +
            ‘</ss:Style>‘ +
            ‘<ss:Style ss:Parent="even" ss:ID="evendate">‘ +
            ‘<ss:NumberFormat ss:Format="yyyy-mm-dd" />‘ +
            ‘</ss:Style>‘ +
            ‘<ss:Style ss:Parent="even" ss:ID="evenint">‘ +
            ‘<ss:NumberFormat ss:Format="0" />‘ +
            ‘</ss:Style>‘ +
            ‘<ss:Style ss:Parent="even" ss:ID="evenfloat">‘ +
            ‘<ss:NumberFormat ss:Format="0.00" />‘ +
            ‘</ss:Style>‘ +
            ‘<ss:Style ss:ID="odd">‘ +
            ‘<ss:Interior ss:Pattern="Solid"  />‘ +
            ‘</ss:Style>‘ +
            ‘<ss:Style ss:Parent="odd" ss:ID="odddate">‘ +
            ‘<ss:NumberFormat ss:Format="yyyy-mm-dd" />‘ +
            ‘</ss:Style>‘ +
            ‘<ss:Style ss:Parent="odd" ss:ID="oddint">‘ +
            ‘<ss:NumberFormat ss:Format="0" />‘ +
            ‘</ss:Style>‘ +
            ‘<ss:Style ss:Parent="odd" ss:ID="oddfloat">‘ +
            ‘<ss:NumberFormat ss:Format="0.00" />‘ +
            ‘</ss:Style>‘ +
            ‘</ss:Styles>‘ +
            worksheet.xml +
            ‘</ss:Workbook>‘;
    },

    ‘‘‘创建worksheet，将dataGrid的标题放到里面‘‘‘
    createWorksheet: function (jq, param) {
        ‘‘‘Calculate cell data types and extra class names which affect formatting‘‘‘
        var cellType = [];
        var cellTypeClass = [];
        ‘‘‘var cm = this.getColumnModel();‘‘‘
        var totalWidthInPixels = 0;
        var colXml = ‘‘;
        var headerXml = ‘‘;
        var visibleColumnCountReduction = 0;
        var cfs = $(jq).datagrid(‘getColumnFields‘);
        var colCount = cfs.length;
        for (var i = 0; i < colCount; i++) {
            if (cfs[i] != ‘‘) {
                var w = $(jq).datagrid(‘getColumnOption‘, cfs[i]).width;
                totalWidthInPixels += w;
                if (cfs[i] === "") {
                    cellType.push("None");
                    cellTypeClass.push("");
                    ++visibleColumnCountReduction;
                }
                else {
                    colXml += ‘<ss:Column ss:AutoFitWidth="1" ss:Width="130" />‘;
                    headerXml += ‘<ss:Cell ss:StyleID="headercell">‘ +
                        ‘<ss:Data ss:Type="String">‘ + $(jq).datagrid(‘getColumnOption‘, cfs[i]).title + ‘</ss:Data>‘ +
                        ‘<ss:NamedCell ss:Name="Print_Titles" /></ss:Cell>‘;
                    cellType.push("String");
                    cellTypeClass.push("");
                }
            }
        }
        var visibleColumnCount = cellType.length - visibleColumnCountReduction;

        var result = {
            height: 9000,
            width: Math.floor(totalWidthInPixels * 30) + 50
        };

        var rows = $(jq).datagrid(‘getRows‘);
        // Generate worksheet header details.
        var t = ‘<ss:Worksheet ss:Name="‘ + param.title + ‘">‘ +
            ‘<ss:Names>‘ +
            ‘<ss:NamedRange ss:Name="Print_Titles" ss:RefersTo="=\‘‘ + param.title + ‘\‘!R1:R2" />‘ +
            ‘</ss:Names>‘ +
            ‘<ss:Table x:FullRows="1" x:FullColumns="1"‘ +
            ‘ ss:ExpandedColumnCount="‘ + (visibleColumnCount + 2) +
            ‘" ss:ExpandedRowCount="‘ + (rows.length + 2) + ‘">‘ +
            colXml +
            ‘<ss:Row ss:AutoFitHeight="1">‘ +
            headerXml +
            ‘</ss:Row>‘;

        //将DataGrid的数据循环加入到Excel中
       //Generate the data rows from the data in the Store
        //for (var i = 0, it = this.store.data.items, l = it.length; i < l; i++) {
        for (var i = 0, it = rows, l = it.length; i < l; i++) {
            t += ‘<ss:Row>‘;
            var cellClass = (i & 1) ? ‘odd‘ : ‘even‘;
            r = it[i];
            var k = 0;
            for (var j = 0; j < colCount; j++) {
                //if ((cm.getDataIndex(j) != ‘‘)
                if (cfs[j] != ‘‘) {
                    //var v = r[cm.getDataIndex(j)];
                    var v = r[cfs[j]];
                    if (cellType[k] !== "None") {
                        t += ‘<ss:Cell ss:StyleID="‘ + cellClass + cellTypeClass[k] + ‘"><ss:Data ss:Type="‘ + cellType[k] + ‘">‘;
                        if (cellType[k] == ‘DateTime‘) {
                            t += v.format(‘Y-m-d‘);
                        } else {
                            t += v;
                        }
                        t += ‘</ss:Data></ss:Cell>‘;
                    }
                    k++;
                }
            }
            t += ‘</ss:Row>‘;
        }

        result.xml = t + ‘</ss:Table>‘ +
            ‘<x:WorksheetOptions>‘ +
            ‘<x:PageSetup>‘ +
            ‘<x:Layout x:CenterHorizontal="1" x:Orientation="Landscape" />‘ +
            ‘<x:Footer x:Data="Page &amp;P of &amp;N" x:Margin="0.5" />‘ +
            ‘<x:PageMargins x:Top="0.5" x:Right="0.5" x:Left="0.5" x:Bottom="0.8" />‘ +
            ‘</x:PageSetup>‘ +
            ‘<x:FitToPage />‘ +
            ‘<x:Print>‘ +
            ‘<x:PrintErrors>Blank</x:PrintErrors>‘ +
            ‘<x:FitWidth>1</x:FitWidth>‘ +
            ‘<x:FitHeight>32767</x:FitHeight>‘ +
            ‘<x:ValidPrinterInfo />‘ +
            ‘<x:VerticalResolution>600</x:VerticalResolution>‘ +
            ‘</x:Print>‘ +
            ‘<x:Selected />‘ +
            ‘<x:DoNotDisplayGridlines />‘ +
            ‘<x:ProtectObjects>False</x:ProtectObjects>‘ +
            ‘<x:ProtectScenarios>False</x:ProtectScenarios>‘ +
            ‘</x:WorksheetOptions>‘ +
            ‘</ss:Worksheet>‘;
        //alert(result.xml);
        return result;
    }
});

然后再新建一个一般处理程序

public void ProcessRequest(HttpContext context)        {
           ‘‘‘给要下载的Excel赋一个初始的文件名‘‘‘
            string fn = DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".xls";
            ‘‘‘获取前台传回来的值，应该是一个XML文件的内容‘‘‘‘
            string data = context.Request.Form["data"];
            ‘‘‘将相对路径转换为绝对路径，数据，编码方式‘‘‘
            File.WriteAllText(context.Server.MapPath(fn), data, Encoding.UTF8);‘‘‘如果是gb2312的xml申明，第三个编码参数修改为Encoding.GetEncoding(936)‘‘‘

            context.Response.Write(fn);‘‘‘返回文件名提供下载‘‘‘
        }

其中File.WriteAllText的主要作用

最后在写js事件

‘‘‘状态数据导出Excel‘‘‘
function StateExporterExcel() {‘‘‘导出Excel文件‘‘‘
    ‘‘‘getExcelXML有一个JSON对象的配置，配置项看了下只有title配置，为excel文档的标题‘‘‘
    var data = $(‘#dgState‘).datagrid(‘getExcelXml‘, { title: ‘datagrid import to excel‘ }); ‘‘‘获取datagrid数据对应的excel需要的xml格式的内容‘‘‘
    ‘‘‘用ajax发动到动态页动态写入xls文件中‘‘‘
    var url = ‘DataGridToExcel.ashx‘; ‘‘‘如果为asp注意修改后缀‘‘‘
    $.ajax({
        url: url, data: { data: data }, type: ‘POST‘, dataType: ‘text‘,
        success: function (fn) {
            ‘‘‘alert(‘导出excel成功！‘);‘‘‘
            ‘‘‘执行下载操作‘‘‘
            window.location = fn; 
        },
        error: function (xhr) {
            alert(‘动态页有问题\nstatus：‘ + xhr.status + ‘\nresponseText：‘ + xhr.responseText)
        }
    });
    return false;
}

导出的弹出窗口，看着还可以

导出来的数据是这样的