Print specific part of webpage asp.net

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I am trying to print a specific part of my application. My div. It works in html single page, but not in my application. My page is in ASP.NET and c#, but as I could not embed the function in C#, i am trying through javascript. However, there is a problem with the property inner.html

error:

0x800a138f - JavaScript runtime error: Unable to get property 'innerHTML' of undefined or null reference

code:

<script type="text/javascript">
    function printdiv
        var prtContent = document.getElementById("specific");
        var WinPrint = window.open('', '', 'left=0,top=0,width=800,height=900,toolbar=0,scrollbars=0,status=0');
        WinPrint.document.write(prtContent.innerHTML);
        WinPrint.document.close();
        WinPrint.focus();
        WinPrint.print();
        WinPrint.close();
</script>

<asp:Button ID="printButton" runat="server" Text="Print Results" OnClientClick="printdiv()"/>

My page is in asp, maybe that's the problem? How can i make it equivalent to print the div i want specifically?

edit, i don't know if it is relevant: specific part of div

javascript
c#
html
asp.net
asked on Stack Overflow Dec 13, 2017 by (unknown user) • edited Dec 13, 2017 by (unknown user)

2 Answers

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Use the below code. Happy coding.

<!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>
    <title></title>
    <script type="text/javascript">
        function PrintDiv() {
            var contents = document.getElementById("dvContents").innerHTML;
            var frame1 = document.createElement('iframe');
            frame1.name = "frame1";
            frame1.style.position = "absolute";
            frame1.style.top = "-1000000px";
            document.body.appendChild(frame1);
            var frameDoc = frame1.contentWindow ? frame1.contentWindow : frame1.contentDocument.document ? frame1.contentDocument.document : frame1.contentDocument;
            frameDoc.document.open();
            frameDoc.document.write('<html><head><title>DIV Contents</title>');
            frameDoc.document.write('</head><body>');
            frameDoc.document.write(contents);
            frameDoc.document.write('</body></html>');
            frameDoc.document.close();
            setTimeout(function () {
                window.frames["frame1"].focus();
                window.frames["frame1"].print();
                document.body.removeChild(frame1);
            }, 500);
            return false;
        }
    </script>
</head>
<body>
    <form id="form1">
    <span style="font-size: 10pt; font-weight: bold; font-family: Arial">Sample by Manoj Bhardwaj</span>
    <hr />
    <div id="dvContents" style="border: 1px dotted black; padding: 5px; width: 300px">
        <span style="font-size: 10pt; font-weight: bold; font-family: Arial">Hi,
            <br />
            This is <span style="color: #18B5F0">a sample code my manoj</span>.<br />
            i hope this will help you to print a div</span>
    </div>
    <br />
    <input type="button" onclick="PrintDiv();" value="Print" />
    </form>
</body>
</html>

i hope this will help you out.

answered on Stack Overflow Dec 13, 2017 by Manoj Bhardwaj
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You have to change OnClientClick from OnClientClick="printdiv()" to OnClientClick=" return printdiv()"

so your code suppose to

    <script type="text/javascript">
        function PrintDiv() {
            var contents = document.getElementById("dvContents").innerHTML;
            var frame1 = document.createElement('iframe');
            frame1.name = "frame1";
            frame1.style.position = "absolute";
            frame1.style.top = "-1000000px";
            document.body.appendChild(frame1);
            var frameDoc = frame1.contentWindow ? frame1.contentWindow : frame1.contentDocument.document ? frame1.contentDocument.document : frame1.contentDocument;
            frameDoc.document.open();
            frameDoc.document.write('<html><head><title>DIV Contents</title>');
            frameDoc.document.write('</head><body>');
            frameDoc.document.write(contents);
            frameDoc.document.write('</body></html>');
            frameDoc.document.close();
            setTimeout(function () {
                window.frames["frame1"].focus();
                window.frames["frame1"].print();
                document.body.removeChild(frame1);
            }, 500);
            return false;
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
        <span style="font-size: 10pt; font-weight: bold; font-family: Arial">Sample by Dharmin Shah</span>
        <hr />
        <div id="dvContents" style="border: 1px dotted black; padding: 5px; width: 300px" runat="server">
            <span style="font-size: 10pt; font-weight: bold; font-family: Arial">Hi,
            <br />
                This is <span style="color: #18B5F0">Dharmin's sample code</span>.<br />
                i hope this will help you to print a div</span>
        </div>
        <br />
        <asp:Button ID="Button" runat="server" Text="Button" OnClientClick="return PrintDiv();" value="Print" />

    </form>

</body>
answered on Stack Overflow Nov 19, 2019 by Dharmin Shah

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