Whenever I attempt to retrieve content from asp.reportviewer using Javascript, it consistently returns null

I am looking for a way to directly print the content of a reportviewer without saving it as a PDF, Excel, or Word file. After doing some research on Google, I found a solution that involves the following code:


<script language="javascript" type="text/javascript" src="Scripts/jquery-1.4.1.min.js"></script>
<script type="text/javascript">
    function printdiv(printpage) {
        var headstr = "<html><head><title></title></head><body>";
        var footstr = "</body></html>";
        var newstr = document.getElementById(printpage).innerHTML;
        var oldstr = document.getElementById("body1").innerHTML;
        document.getElementById("body1").innerHTML = headstr + newstr + footstr;
        window.print();
        document.getElementById("body1").innerHTML = oldstr;
        return false;
    }

<div id="body1">
    <input name="b_print" type="button" class="ipt" onclick="printdiv('div_print');" value="Print" />
<div id="div_print">
<rsweb:ReportViewer ID="ReportViewer1" runat="server" Width="944px" ShowPrintButton="true" SizeToReportContent="True" AsyncRendering="false" ></rsweb:ReportViewer>
</div>

However, when I tried implementing this code, I encountered an error message stating 'Cannot read property 'innerHTML' of null'. What could be causing this issue?

javascriptreportviewer

Answer №1

For optimal performance, make sure to place your JavaScript code at the end of the body tag. If you find that your script is being executed before the necessary elements are loaded, it may be because the element with the id body1 has not been defined yet. To fix this issue, you can also include your script in the head section using a script tag with an src attribute.

<head>
  <script src="my_script.js"></script>
</head>
<body>
  <div id="body1"></div>
  ...
  <script type="text/javascript">
    function printdiv(printpage) {...}
  </script>
</body>

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