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HomeHomeArchived Discus...Archived Discus...Developing Under Previous Versions of .NETDeveloping Under Previous Versions of .NETASP.Net 2.0ASP.Net 2.0Client Side id of Server ControlsClient Side id of Server Controls
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5/2/2007 9:34 AM
 
Uri Nizan

www.seamlessmodules.com
Joined: 3/30/2004
Posts: 27

Hi,

I'm writing a custom module using ASP.NET Ajax on DNN 4.5.1
I have a couple of JavaScript files that I include using the ScriptManager.Scripts.Add function on the server.

My question is how do I reference elements on the page in the JavaScript code.

Let's say I have an asp:Image server control That has an ID of Image1. On the client the img element will have an id that looks like this: dnn_ctr397_ViewModule_Image1

How can I reference the element from JavaScript using document.getElementById if I don't know in advanced the client side id?

Thanks,
Uri
 
New Post
5/2/2007 9:46 AM
 
oren

Joined: 9/4/2006
Posts: 10

Hi,

This is actually very simple, each asp.net control has a property called "ClientID" which returns the actual ID of the control on the client's page. This is the ID you can use getElementById  in your script.

There are a few ways to add the client id to a

  1. Add the script at the server side using the Page.ClientScript.RegisterClientScriptBlock function and then assign the client ID when you need to use the getElementById
  2. Use the server print tag  <%= Control.ClientID %> on your JavaScript.

Oren
 
New Post
5/2/2007 2:28 PM
 
Uri Nizan

www.seamlessmodules.com
Joined: 3/30/2004
Posts: 27

Thanks Oren,

This is definitely a viable solution when you add the JavaScript as script blocks on the server.
The problem I'm having is that my JavaScript code is in .js files, and I can't seem to be able to put ASP <% %> tags in the .js files. I keep getting errors. Am I missing something?



Thanks,
Uri
 
New Post
5/2/2007 6:20 PM
 
Jon Henning

www.codeendeavors.com
Joined: 3/20/2003
Posts: 1767

Yes, your substitution would not be handled by the files with the js extension.  However, there is nothing stopping you from having a variable defined in your aspx/ascx file and accessing that variable in the js file.
 
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5/3/2007 6:43 AM
 
lolocwma

dev.cmwa.eu
Joined: 1/5/2007
Posts: 67

This is why JS functions can accept parameters :-)
 
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