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Old February 18th, 2009, 12:10 PM
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Default Adding Client-Side Features to Server Controls


I'm using the OnPreRender method within a Server Control to generate some client side JavaScript, which is to bring focus to a textbox. The method is as follows:

protected override void OnPreRender(EventArgs e)
"ControlFocus", "document.getElementById('" + this.ClientID + 
"').focus();", true);
When the web page is displayed, the page source (relevant bits) is as follows:

<span id="WebCustomControl1_1" style="display:inline-block;background-
   <input type="text" id="WebCustomControl1_1" name="WebCustomControl1_1"
   value="Hello Skin" id="WebCustomControl1_1" style="display:inline-block;
   background-color:Green;font-weight:bold;height:28px;width:152px;" />
<script type="text/javascript">
The focus does not go to the textbox.

Can anyone help with this? I'm working through a textbook example (Wrox C# Pro Ch.23) and there's nothing on the erratum page. If anyone has some of their own examples they'd like to share, that would be appreciated.
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Old February 21st, 2009, 08:22 PM
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I dont know the book so I don't know what the full code is meant to do, but looking at the code snippet, you have named both the containing span and the textbox WebCustomControl1_1, so when you call getElementById, it will find the span first and the focus() won't have any effect. Just try changing the id of the span.
You've also got id="WebCustomControl1_1" twice in the textbox. This won't break it, but shouldn't really be done.

Hope this helps
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Old February 22nd, 2009, 01:44 PM
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Philip, thanks for your reply.

I removed the <span> tag and it cured the problem. The code was auto generated and I never wanted the span tag to appear anyway.

It turns out to be related to the System.Web.UI.HtmlTextWriterTag that automatically sends out this tag unless you override it.


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