导出Excel(Ext 前台部分)

开发思路: 

- 序列化当前GridPanel 数据, 表头结构(用于对应关系), 通过控制器Aspose写到Excel中, 然后返回临时文件地址, 弹出窗口下载.

function btnExportOut(gpl, isOnlyCurrentPage) {
        var reportName = '导出文件名前缀';          

        if (Ext.isEmpty(gpl.xtype)) {
            gpl = App[gpl];
            if (gpl.xtype != 'grid' && gpl.xtype != 'treepanel') {
                Ext.MessageBox.show({
                    title: "提示",
                    msg: "导出参数错误。",
                    modal: true,
                    buttons: Ext.Msg.OK,
                    icon: Ext.Msg.INFO
                });
                return;
            }
        }
        if (gpl.xtype == "grid" && gpl.store.data.items.length == 0 && isOnlyCurrentPage == 1) {
            Ext.MessageBox.show({
                title: "提示",
                msg: "列表没有数据,不能进行导出。",
                modal: true,
                buttons: Ext.Msg.OK,
                icon: Ext.Msg.INFO
            });
            return;

        }
        if (gpl.xtype == "treepanel" && gpl.items.length == 0 && isOnlyCurrentPage == 1) {
            Ext.MessageBox.show({
                title: "提示",
                msg: "列表没有数据,不能进行导出。",
                modal: true,
                buttons: Ext.Msg.OK,
                icon: Ext.Msg.INFO
            });
            return;
        }
        Ext.net.Mask.show({ msg: '正在导出数据,请稍候...' });
        
        var datas = getGirdAllData(gpl);
        Ext.Ajax.request({
            url: isOnlyCurrentPage == 1 ? '/当前页' : '/全部页/',
            params: {
                queryP: Ext.encode(gpl.store.readParameters().apply), //Grid 的parameter参数数组
                jsonData: Ext.encode(datas), //当前页需要把数据传入. 全部页用不到这个数据. 
                _reportName: reportName,
                _headerStruct: getEncodeGridHeader(gpl)
            },
            method: 'POST',
            timeout: 600000,
            success: function (u) {
                //防止下载出现0kb情况,等待后台下载
                setTimeout(function () {
                    Ext.net.Mask.hide();
                    showExport(u.responseText);
                }, 3000);
            },
            failure: function (u) {
                Ext.net.Mask.hide();
                Ext.Msg.alert(u.responseText);
            }
        })

    }
    
     var showExport = function (url) {
        Ext.MessageBox.show({
            title: "Excel下载提示",
            msg: "<a href='" + url + "' style='color: blue;text-decoration: none;font-size:15px;font-weight: bold;'>请点击此处下载到本地</a>",
            modal: true,
            buttons: Ext.Msg.CANCEL,
            icon: Ext.Msg.INFO
        });
    }
    
    function getEncodeGridHeader(gpl) {
        var headers;
        dataIndex = 0;
        var headers = getAllHeader(gpl.columns, gpl);        
        headers = Ext.encode(headers);
        return headers;
    } 
    
    //获取所以列并带主键
    var getAllHeader = function (gplColumns, gpl) {
        var data = [];
        for (var colIndex in gplColumns) {
            var col = gplColumns[colIndex];
            if (col.dataIndex != "Checked") {
                var colText = col.text == null ? "" : col.text;
                if (colText != "") {
                    var tmp = {
                        Text: col.text.toLowerCase().replace(/<br/>/g, "").replace(/</br>/g, "").replace(/</g, "").replace(/>/g, ""),
                        Width: getWidth(col),
                        Cols: []
                    };
                    var field = gpl.store.getFieldByName(col.dataIndex);
                    if (field) {
                        tmp.DataType = field.type.type;
                    }
                    if (col.items && col.items.length > 0) {
                        tmp.Cols = getAllHeader(col.items.items, gpl);
                    } else if (col.columns && col.columns.length > 0) {
                        tmp.Cols = getAllHeader(col.columns, gpl);
                    } else {
                        tmp.DataIndex = col.dataIndex;
                        tmp.Index = "d" + dataIndex++; //索引
                    }
                    if (col.hidden) {
                        tmp.Hiden = true;
                        if (colText.toLowerCase() == "id" || colText.toLowerCase() == "mid" || colText.toLowerCase() == "sid") {
                        }
                        else {
                            continue;
                        }
                    }
                    else {
                        tmp.Hiden = false;
                    }
                    tmp.xtype = col.xtype; //列类型
                    if (col.editor) {
                        tmp.editor = col.editor.xtype; //文本框类型
                    }
                    else {
                        tmp.editor = "";
                    }
                    if (col.xtype == 'rownumberer' || col.xtype == 'commandcolumn') {
                        continue;
                    }
                    data.push(tmp);
                }
            }
        }
        return data;
    };

    //获取宽度
    var getWidth = function (col) {
        if (col.width) {
            return col.width;
        } else if (col.getWidth) {
            return col.getWidth();
        } else {
            return 100;
        }

    }

一堆操作获得表头-实际列json结构:

调用部分: 

<ext:Button ID="Button3" runat="server" Text="导出全部页Excel" Icon="ArrowDown" TagString="grid">
                                        <Listeners>
                                            <Click Handler="btnExportOut(SalaryBonusCalculationInForGPanel, 0)" />
                                        </Listeners>
                                    </ext:Button>