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This is the exact same question as this unanswered one from May.
(edit) Note: this unanswered post exactly describes the behavior - extra scripts being added in the <head> by ScriptManager.RegisterClientScriptBlock in a usercontrol, in an UpdatePanel, is causing duplicates. C# .NET 4.0. The page is structured like this:
MasterPage
Page
UserControl1 (ascx) - loaded in code by Page
UpdatePanel
UserControl2 (ascx) - loaded in code by UserControl1
The first time the script is added as expected, in the body. The code, simply, in the UserControl2 OnInit:
ScriptManager.RegisterClientScriptBlock(Page, Page.GetType(), "myscript", script, true);
I've also tried referencing "this" instead of page, which doesn't really make sense since I don't want the same script keys duplicated on the page if the usercontrol is loaded multiple times on a page, but it didn't work anyway.
After a partial postback, the script is added again - but curiously in the <head> of the page, not the body, and interestingly, lacking the normal //<![CDATA[...//]]> wrapper that asp.net usually adds.
Another script which is added by UserControl1 is duplicated exactly the same way after a partial postback.
Does anyone know why this is happening?
882
You can add a check to confirm if the script has been registered before registering it again.
if (!Page.ClientScript.IsClientScriptRegistered (Page.GetType(), "myscript"))
ScriptManager.RegisterClientScriptBlock(Page, Page.GetType(), "myscript", script, true);
I hope this helps.
143
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