ClientID problem in Asp.Net 2.0

[Miguel Dias Moura]

Hello,

I am having problems in accessing controls in my Asp.Net 2.0 pages.
I know Asp.Net 2.0 generates a ClientId.

In a Javascript function I tried to hide a panel as follows:

function ChangePanel()
{
document.getElementById("<%=Panel1.ClientID %>").style.display =
"block";
}

It is not working. I tried to check the code as follows:

function ChangePanel()
{
var PanelClientID = document.getElementById("<%=Panel1.ClientID
%>").style.display = "block";
alert("Client ID:" + PanelClientID)
}

I get Null.

If I place the code <%=Panel1.ClientID %> in my HTML code I get:

ctl00_MyContentPlaceHolder_Panel1

This was what I was expecting.

I think I am using "<%=Panel1.ClientID %>" wrong in my Javascript
function.

This is driving me crazy.

Could someone, please, help me out?

Thank You,
Miguel

 

[Varangian]

are you using GetCallbackEventReference ?

 

[Bruce Barker]

when you view source what does your javascript look like? also looking at
the source, what is the panels actual id tag?

-- bruce (sqlwork.com)

 

[Miguel Dias Moura]

Hi,

The panel id tag is ctl00_MyContentPlaceHolder_Panel1.

When I view the source I see the include line that includes the
javascript file. I am using the following line to load the javascript
file at runtime in the Page_Init:

' Define and include javascript file
Dim name As String = "Inscricao"
Dim url As String = "Assets/Javascript/Subs.js"
Dim type As Type = Me.GetType()

' Get a ClientScriptManager reference from the Page class
Dim reference As ClientScriptManager = Page.ClientScript

' Check if the include script is already registered
If (Not reference.IsClientScriptIncludeRegistered(type, name)) Then
' Include javascript file
reference.RegisterClientScriptInclude(type, name, url)
End If

However I call the javascript function only when a dropdownlist is
changed.
I can't figure what the problem is.

Thanks,
Miguel

 

[Paul Henderson]

The panel id tag is ctl00_MyContentPlaceHolder_Panel1.

When I view the source I see the include line that includes the
javascript file. I am using the following line to load the javascript
file at runtime in the Page_Init...

If the Javascript file is just included like that, then ASP.NET won't
be preprocessing it for server tags (<%...%>), as it isn't part of a
..aspx file. You probably need to include the JS code directly in the
aspx file, or set up a global variable in there that is accessed by the
JS file when it needs the clientID.