Question

Access dynamic control by ID

Asked by: info2009

I am bulding e web application. I have created a dynamic TextBox
TextBox t = new TextBox();
t.ID ="test1";
Then, in the .aspx page i want to access this textbox. I have build a function to do this but with no result :
function prove(){
document.getElementByID('<%test1.ClientID%>)
}
Any idea ?!
Thank You

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Asked On
2009-10-27 at 02:56:52ID24846579
Topics

Scripting Languages

,

JavaScript

,

C# Programming Language

Participating Experts
2
Points
500
Comments
16

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Answers

 

by: aiklamhaPosted on 2009-10-27 at 03:00:43ID: 25670598

you should write

document.getElementByID('test1')

 

by: info2009Posted on 2009-10-27 at 03:21:44ID: 25670713

I have prove. It doesn't work.

 

by: naspinskiPosted on 2009-10-27 at 03:33:36ID: 25670768

you are missing a quote

function prove(){
document.getElementByID('<%test1.ClientID%>')
}
 
//does that make any difference?

                                              
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by: info2009Posted on 2009-10-27 at 03:41:30ID: 25670809

No, no. It is only a mistake of writen in the post. I the code it is ok. To be more correct the code is
document.getElementById('<%test.ClientID%>'), with "d" not with "D" in the function getElementByID.

 

by: naspinskiPosted on 2009-10-27 at 03:44:35ID: 25670825

How are you testing that it is or is not being found? What does Prove() do?

Do a view source, does the javascript coincide with your markup?

 

by: info2009Posted on 2009-10-27 at 03:48:13ID: 25670843

i test the document.getElementByID('<%test1.ClientID%>') in the quick watch of visual studio 2008, and it returns to me a null value.

 

by: naspinskiPosted on 2009-10-27 at 04:21:01ID: 25671032

debuggin Javascript is generally a bit different, do me a favor and try this:

document.getElementByID('<%test1.ClientID%>').innerHTML("got it");

                                              
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by: naspinskiPosted on 2009-10-27 at 04:21:48ID: 25671038

also, like I asked before - Do a view source, does the javascript coincide with your markup?

 

by: naspinskiPosted on 2009-10-27 at 04:22:43ID: 25671043

Keep in mind that by default, the VS2008 debugger only watches the server side code, not the client-side (javascript)

 

by: info2009Posted on 2009-10-27 at 04:30:13ID: 25671096

thank you for your replies, i try what you say to me , but still no result. I know how to debug javascript, i have enabled it. To be more clear, i will reexplain  the issue. I create a dynamic textbox and set to it the id in c# code. When it is created i see from c# the ClientID of this textbox is something different from the id (for example something like ctl_test1)

 

by: naspinskiPosted on 2009-10-27 at 04:32:55ID: 25671115

I understand that, that is why I keep asking you to look at the source.  Please do a 'View Source' and look at the javascript, then look at your control - does the control's ID and the ID in the javascript match?

 

by: info2009Posted on 2009-10-27 at 04:36:10ID: 25671145

no

 

by: info2009Posted on 2009-10-27 at 04:37:42ID: 25671162

this was the question in reality. How to catch a control from javascript, that i have specified an id in c# ,  when the id in javascript is different from the id that i have assigned to it in c#

 

by: naspinskiPosted on 2009-10-27 at 04:49:27ID: 25671259

the best approach I find is to use jquery, something simple like this (lets say your control i has an ID of 'test1'):

$().ready(function() {
  var textbox = $("input[id$='test1']");
});
 
//that gets the input element with the ID that ends with 'test1'

                                              
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by: info2009Posted on 2009-10-27 at 05:05:38ID: 25671395

i think this is what i was searching for, but i am not able to use it. Can you be more explicit how to use this piece of code. When i used it i get an error message : Object expected.
Thank You

 

by: naspinskiPosted on 2009-10-27 at 07:43:23ID: 25672933

First you have to be sure you are loading the jQuery, I recommend loading it from the google CDN, then just run the code.  This will put 'hello' into all the textboxes that have an ID that end with 'test1':

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<script type="text/javascript">
    $().ready(function() {
        $("input[id$='test1']").val("hello");
    });         
</script>

                                              
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