在reportviewer print期间发生错误，jscript运行时错误：无法获取属性'get_isloading'的值，对象为null或未定义 [英] Error occured during reportviewer print, jscript runtime error: unable to get value of the property 'get_isloading', object is null or undefined

问题描述

我试图为Report Viewer Control提供打印选项，但在这种情况下它会产生以下错误

Im trying to Provide print option for Report Viewer Control and but in this case it's generating following error

JScript runtime error: 
Variable 'viewerReference' is going null
so Unable to get value of the property 'get_isLoading': object is null or undefined

我尝试了什么：

What I have tried:

<div align="center">
       <asp:Panel ID="PanelButtons" runat="server">
       <asp:Button ID="btnPrint" runat="server" Text="Print" OnClientClick="PrintReport()"/>
       </asp:Panel>
    </div>

<script language="javascript" type="text/javascript">
        function PrintReport() {
            var viewerReference = $find("ReportViewer1");
            //var viewerReference = $find('<%= ReportViewer1.ClientId %>');

            var stillonLoadState = viewerReference.get_isLoading();

            if (!stillonLoadState ) {
                var reportArea = viewerReference .get_reportAreaContentType();
                if (reportArea == Microsoft.Reporting.WebFormsClient.ReportAreaContent.ReportPage) {
                    $find("ReportViewer1").invokePrintDialog();
                }
            }
        }
       </script>

推荐答案

find（ ReportViewer1）;
// var viewerReference =

find("ReportViewer1"); //var viewerReference =

find（'<％ = ReportViewer1.ClientId％>'）;

var stillonLoadState = viewerReference.get_isLoading（）;

if （！stillonLoadState）{
var reportArea = viewerReference .get_reportAreaContentType（）;
if （reportArea == Microsoft.Reporting.WebFormsClient.ReportAreaContent.ReportPage）{

find('<%= ReportViewer1.ClientId %>'); var stillonLoadState = viewerReference.get_isLoading(); if (!stillonLoadState ) { var reportArea = viewerReference .get_reportAreaContentType(); if (reportArea == Microsoft.Reporting.WebFormsClient.ReportAreaContent.ReportPage) {

find（ ReportViewer1）。invokePrintDialog（）;
}
}
}
< / script >

find("ReportViewer1").invokePrintDialog(); } } } </script>

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