Question

I have a page that includes javascript which I only want to run under certain conditions. To do this I have placed the scripts into an asp:placeholder

This actually seems to work but when I run a debug on the page I get the following warning.

Element ‘placeholder’ is not a known element. This can occur if there is a compilation error in the Web site, or the web.config file is missing.

If I move the placeholders into the body of the page the warning goes, but that means I’m left with scripts in the body which I also want to avoid. Does anyone have any hints on the best practice for this scenario?? thanks

Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)

dim lt as new Literal()
lt.text = "<script type='text/javascript' src='scripts/pageLoadAnimations.js'></scr" & "ipt>"
me.Header.Controls.Add(lt)

End Sub

Answer 1

You can include JS file straight from code behind:

If (some condition is true) Then
   Page.ClientScript.RegisterClientScriptInclude("jQuery", "jquery-version.js")
End If