Hi Andrew,
As Andy suggested, you may try using the AJAX ScriptManager class's
RegisterSclient.... methods instead of the ASP.NET
Page.ClientScriptManager... Here are some articles about dealing with
scripts of controls used in AJAX updatepanel:
#Inline Script inside an ASP.NET AJAX UpdatePanel
http://weblogs.asp.net/infinitiesloo...e-script-insid
e-an-asp-net-ajax-updatepanel.aspx
#HOWTO: Write controls compatible with UpdatePanel without linking to the
ASP.NET AJAX DLL
http://weblogs.asp.net/leftslipper/a...00_-Write-cont
rols-compatible-with-UpdatePanel-without-linking-to-the-ASP.NET-AJAX-DLL.asp
x
Sincerely,
Steven Cheng
Microsoft MSDN Online Support Lead
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--------------------
>From: "Andrew Jocelyn" <(E-Mail Removed)>
>Subject: AJAX UpdatePanel stops custom JavaScript working
>Date: Tue, 11 Mar 2008 18:38:54 -0000
>Lines: 66
>
>
>Hi
>
>I have a custom server control which basically adds a client side
character
>counter to display with an Html TextArea. When I use the control inside an
>UpdatePanel the JavaScript counter disappears.
>
>Please see code below.
>
>Any ideas?
>Thanks
>Andrew
>
>
>protected override void OnPreRender(EventArgs e)
>{
> if (IsRequired)
> _reqValidator.Visible = true;
>
> // Get a ClientScriptManager reference from the Page class.
> ClientScriptManager cs = Page.ClientScript;
>
> cs.RegisterClientScriptInclude("DisplayLengthFunctions",
> cs.GetWebResourceUrl(this.GetType(),
>"MyControls.WebControls.DisplayLengthFunctions.js"));
>
> cs.RegisterStartupScript(this.GetType(), this.ID + "DisplayLength",
> "DisplayCounter('" + _textBox.ClientID + "','" + this.ID + "_Counter'," +
>this.MaxLength.ToString() + ");", true);
>
> base.OnPreRender(e);
>}
>
>///////////////////////////////
>// DisplayLengthFunctions.js
>////////////////////////////////
>function DisplayCounter(textId, counterId, maxLength) {
> var W3CDOM = document.createElement && document.getElementsByTagName
&&
>document.getElementById;
> if (!W3CDOM) return;
>
> var x = document.getElementById(textId);
> x.setAttribute('maxlength', maxLength);
>
> var counter = document.getElementById(counterId);
> counter.innerHTML = '<span>0</span>/' + maxLength;
> counter.relatedElement = x;
>
> x.relatedElement = counter.getElementsByTagName('span')[0];
>
> x.onkeyup = x.onchange = CheckMaxLength;
> x.onkeyup();
>}
>
>// event handler for textarea onkeyup and onchange
>function CheckMaxLength() {
> var maxLength = this.getAttribute('maxlength');
> var currentLength = this.value.length;
> if (currentLength > maxLength)
> this.relatedElement.style.color = 'red';
> else
> this.relatedElement.style.color = '';
> this.relatedElement.firstChild.nodeValue = currentLength;
>}
>
>
>
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