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使用XtraReports时，如何在web程序的运行时状态下缩放报表？

来源：本站原创   发布时间：2012-08-27   浏览：2328次

通过ReportViewer查看报表时，要实现报表的缩放功能，需要在运行时根据保存到HiddenField中 ScaleFactor值，调整XtraReport.PrintingSystem.Document.ScaleFactor属性。

要修改HiddenField值，需要创建自定义ReportToolbar按钮（ReportToolbarComboBox）。

请注意，Document.ScaleFactor属性不影响报表的页面大小，所以你可能需要使用当前的比例值手动改变页面大小。

C#

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<%@ Register Assembly="DevExpress.XtraReports.v11.2.Web, Version=11.2.8.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
Namespace="DevExpress.XtraReports.Web" TagPrefix="dxxr" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
<script language="javascript">
function UpdateScaleFactor(sender) {
document.getElementById('Scale').value = sender.GetText();
viewer.Refresh();
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<dxxr:ReportToolbar ID="ReportToolbar1" runat="server" ShowDefaultButtons="False" ReportViewer="<%# ReportViewer1 %>">
<Items>
<dxxr:ReportToolbarButton ItemKind="Search" ToolTip="Display the search window" />
<dxxr:ReportToolbarSeparator />
<dxxr:ReportToolbarButton ItemKind="PrintReport" ToolTip="Print the report" />
<dxxr:ReportToolbarButton ItemKind="PrintPage" ToolTip="Print the current page" />
<dxxr:ReportToolbarSeparator />
<dxxr:ReportToolbarButton Enabled="False" ItemKind="FirstPage" ToolTip="First Page" />
<dxxr:ReportToolbarButton Enabled="False" ItemKind="PreviousPage" ToolTip="Previous Page" />
<dxxr:ReportToolbarLabel Text="Page" />
<dxxr:ReportToolbarComboBox ItemKind="PageNumber" Width="65px">
</dxxr:ReportToolbarComboBox>
<dxxr:ReportToolbarLabel Text="of" />
<dxxr:ReportToolbarTextBox ItemKind="PageCount" />
<dxxr:ReportToolbarButton ItemKind="NextPage" ToolTip="Next Page" />
<dxxr:ReportToolbarButton ItemKind="LastPage" ToolTip="Last Page" />
<dxxr:ReportToolbarSeparator />
<dxxr:ReportToolbarButton ItemKind="SaveToDisk" ToolTip="Export a report and save it to the disk" />
<dxxr:ReportToolbarButton ItemKind="SaveToWindow" ToolTip="Export a report and show it in a new window" />
<dxxr:ReportToolbarComboBox ItemKind="SaveFormat" Width="70px">
<Elements>
<dxxr:ListElement Text="Pdf" Value="pdf" />
<dxxr:ListElement Text="Xls" Value="xls" />
<dxxr:ListElement Text="Rtf" Value="rtf" />
<dxxr:ListElement Text="Mht" Value="mht" />
<dxxr:ListElement Text="Text" Value="txt" />
<dxxr:ListElement Text="Csv" Value="csv" />
<dxxr:ListElement Text="Image" Value="png" />
</Elements>
</dxxr:ReportToolbarComboBox>
<dxxr:ReportToolbarSeparator />
<dxxr:ReportToolbarLabel Text="Zoom Factor" />
<dxxr:ReportToolbarComboBox Name="ScaleFactor" Width="50px">
<Elements>
<dxxr:ListElement Text="100" Value="100" />
<dxxr:ListElement Text="200" Value="200" />
<dxxr:ListElement Text="250" Value="250" />
</Elements>
</dxxr:ReportToolbarComboBox>
<dxxr:ReportToolbarLabel Text="%" />
</Items>
<Styles>
<LabelStyle>
<Margins MarginLeft='3px' MarginRight='3px' />
</LabelStyle>
</Styles>
<ClientSideEvents ItemValueChanged="function(s, e) { UpdateScaleFactor(s) }" />
</dxxr:ReportToolbar>
<br />
<dxxr:ReportViewer ID="ReportViewer1" runat="server" ClientInstanceName="viewer">
</dxxr:ReportViewer>
<input id="Scale" runat="server" type="hidden" />
</div>
</form>
</body>
</html>

VB.NET

<%@ Page Language="vb" AutoEventWireup="true" CodeFile="Default.aspx.vb" Inherits="_Default" %>

<%@ Register Assembly="DevExpress.XtraReports.v11.2.Web, Version=11.2.8.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
Namespace="DevExpress.XtraReports.Web" TagPrefix="dxxr" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
<script language="javascript">
function UpdateScaleFactor(sender) {
document.getElementById('Scale').value = sender.GetText();
viewer.Refresh();
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<dxxr:ReportToolbar ID="ReportToolbar1" runat="server" ShowDefaultButtons="False" ReportViewer="<%#ReportViewer1%>">
<Items>
<dxxr:ReportToolbarButton ItemKind="Search" ToolTip="Display the search window" />
<dxxr:ReportToolbarSeparator />
<dxxr:ReportToolbarButton ItemKind="PrintReport" ToolTip="Print the report" />
<dxxr:ReportToolbarButton ItemKind="PrintPage" ToolTip="Print the current page" />
<dxxr:ReportToolbarSeparator />
<dxxr:ReportToolbarButton Enabled="False" ItemKind="FirstPage" ToolTip="First Page" />
<dxxr:ReportToolbarButton Enabled="False" ItemKind="PreviousPage" ToolTip="Previous Page" />
<dxxr:ReportToolbarLabel Text="Page" />
<dxxr:ReportToolbarComboBox ItemKind="PageNumber" Width="65px">
</dxxr:ReportToolbarComboBox>
<dxxr:ReportToolbarLabel Text="of" />
<dxxr:ReportToolbarTextBox ItemKind="PageCount" />
<dxxr:ReportToolbarButton ItemKind="NextPage" ToolTip="Next Page" />
<dxxr:ReportToolbarButton ItemKind="LastPage" ToolTip="Last Page" />
<dxxr:ReportToolbarSeparator />
<dxxr:ReportToolbarButton ItemKind="SaveToDisk" ToolTip="Export a report and save it to the disk" />
<dxxr:ReportToolbarButton ItemKind="SaveToWindow" ToolTip="Export a report and show it in a new window" />
<dxxr:ReportToolbarComboBox ItemKind="SaveFormat" Width="70px">
<Elements>
<dxxr:ListElement Text="Pdf" Value="pdf" />
<dxxr:ListElement Text="Xls" Value="xls" />
<dxxr:ListElement Text="Rtf" Value="rtf" />
<dxxr:ListElement Text="Mht" Value="mht" />
<dxxr:ListElement Text="Text" Value="txt" />
<dxxr:ListElement Text="Csv" Value="csv" />
<dxxr:ListElement Text="Image" Value="png" />
</Elements>
</dxxr:ReportToolbarComboBox>
<dxxr:ReportToolbarSeparator />
<dxxr:ReportToolbarLabel Text="Zoom Factor" />
<dxxr:ReportToolbarComboBox Name="ScaleFactor" Width="50px">
<Elements>
<dxxr:ListElement Text="100" Value="100" />
<dxxr:ListElement Text="200" Value="200" />
<dxxr:ListElement Text="250" Value="250" />
</Elements>
</dxxr:ReportToolbarComboBox>
<dxxr:ReportToolbarLabel Text="%" />
</Items>
<Styles>
<LabelStyle>
<Margins MarginLeft='3px' MarginRight='3px' />
</LabelStyle>
</Styles>
<ClientSideEvents ItemValueChanged="function(s, e) { UpdateScaleFactor(s) }" />
</dxxr:ReportToolbar>
<br />
<dxxr:ReportViewer ID="ReportViewer1" runat="server" ClientInstanceName="viewer">
</dxxr:ReportViewer>
<input id="Scale" runat="server" type="hidden" />
</div>
</form>
</body>
</html>

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