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POWhy doesn't textbox onchange event fire correctly within asp.net user control?
 

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  1. POWhy doesn't textbox onchange event fire correctly within asp.net user control?
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    <p>I have 2 textboxes that I'm trying to capture the onchange event for. These textboxes are within a user control that is within an asp.net updatepanel. Every time I change the textbox text, I receive a "Microsoft JScript runtime error: Object expected" error that doesn't provide any other helpful information.</p> <p>Here is the code:</p> <pre><code> &lt;script type="text/javascript"&gt; function ResetOrientationImage() { var width = (+document.getElementById('&lt;%= txtWidth.ClientID %&gt;').value); var height = (+document.getElementById('&lt;%= txtHeight.ClientID %&gt;').value); if (width &gt; height) { document.getElementById('&lt;%= imgOrientation.ClientID %&gt;').src = "images/buttons/Landscape.png"; } else { document.getElementById('&lt;%= imgOrientation.ClientID %&gt;').src = "images/buttons/Portrait.png"; } } &lt;/script&gt; &lt;asp:TextBox ID="txtWidth" runat="server" Width="50px" onchange="ResetOrientationImage()" Text="0"&gt;&lt;/asp:TextBox&gt; &lt;asp:TextBox ID="txtHeight" runat="server" Width="50px" onchange="ResetOrientationImage()" Text="0"&gt;&lt;/asp:TextBox&gt; &lt;asp:Image ID="imgOrientation" ImageUrl="~/images/buttons/Portrait.png" runat="server" /&gt; </code></pre> <p>I thought it must be a problem with the javascript, but I put this exact code into a standalone .aspx page and it executes correctly with no errors.</p> <p><strong>EDIT</strong> Upon looking in Firebug, the real error is that the ResetOrientationImage function cannot be found when the page executes. If I move the javascript out of the user control onto the page itself, it works as I would expect. Why can't the javascript live in the user control?</p>
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    1. COSomething is messing up with you javascript elsewhere, look for an error in the page that you are adding the userControl
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      1. USGregM
    2. COHave you looked at it with IE8+'s JavaScript console which points to the error? Have you debugged what `document.getElementById('<%= txtWidth.ClientID %>').value` and the other one return?
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      1. USepascarello
 

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