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how to reference an element using a variable

Posted on 2014-02-19
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Last Modified: 2014-03-14
Hi,

I am struggling to reference an element using the standard JQuery format :

This works using getelementbyid:
section=1
var log_var='log_id,'+ section 
$( document.getElementById( log_var )).val('TEST')	

HTML:
<input id="log_id,1" type="hidden" />

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but this does not:
section=1
var log_var='log_id,'+ section 
$( '#'+ log_var )).val('TEST')	

HTML:
<input id="log_id,1" type="hidden" />

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I seem to have to be referencing all my elements using the first method, Can anyone let me know what Im doing wrong? BTW.. The elements are not generated witin JQuery  dynamically, they are hardcaded in the html.

Thanks
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Comment
Question by:jellydeal
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13 Comments
 
LVL 54

Expert Comment

by:Scott Fell, EE MVE
ID: 39869787
 section=1;
var log_var='log_id\\,'+ section;
$( '#'+ log_var ).val('TEST');

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0
 
LVL 61

Expert Comment

by:Julian Hansen
ID: 39869898
Too many closing brackets

$( '#'+ log_var )).val('TEST')	

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Should be
$( '#'+ log_var ).val('TEST')

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Author Comment

by:jellydeal
ID: 39869902
Sorry Julian,
That's just a typo on the sample code.
There's the correct amount of brackets in the real code.
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Author Comment

by:jellydeal
ID: 39869903
Hi scott,
Are you saying the comma is a special  character?
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LVL 54

Expert Comment

by:Scott Fell, EE MVE
ID: 39869932
I have never used a character in the ID before so to be honest this was new to me.  Your first example you are using javascript and the 2nd jquery.  With jquery it looks like that has to be escaped.
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LVL 54

Accepted Solution

by:
Scott Fell,  EE MVE earned 2000 total points
ID: 39869938
Sorry, this is the reference http://api.jquery.com/id-selector/
If the id contains characters like periods or colons you have to escape those characters with backslashes.
http://learn.jquery.com/using-jquery-core/faq/how-do-i-select-an-element-by-an-id-that-has-characters-used-in-css-notation/
// Does not work:
$( "#some:id" )
 
// Works!
$( "#some\\:id" )
 
// Does not work:
$( "#some.id" )
 
// Works!
$( "#some\\.id" )

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0
 
LVL 61

Expert Comment

by:Julian Hansen
ID: 39869995
Works for me
<!doctype html>
<html>
<head>
<title>Test</title>
<script src="http://code.jquery.com/jquery.js"></script>
<script type="text/javascript">
$(function() {
section=1;
var log_var='log_id,'+ section;
$( '#'+ log_var ).val('TEST');
});

</script>
<style type="text/css">
</style>
</head>
<body>
<input id="log_id" type="text" />
</body>
</html>

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0
 
LVL 61

Expert Comment

by:Julian Hansen
ID: 39869997
The comma is not an issue (refer previous post) - you should be able to refer to it directly

Online version here

Works in FF and Chrome
0
 
LVL 54

Expert Comment

by:Scott Fell, EE MVE
ID: 39870055
julianH, try using the input  id with a comma like "log_id,1"
<input id="log_id,1" type="hidden" />

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0
 
LVL 54

Expert Comment

by:Scott Fell, EE MVE
ID: 39870058
http://jsbin.com/vosuquye/1/edit?html,output
<!doctype html>
<html>
<head>
<script src="http://code.jquery.com/jquery-1.10.2.min.js"></script>
<title>Test</title>

<script type="text/javascript">
$(function() {
section=1;
var log_var='log_id,'+ section;
$( '#'+ log_var ).val('TEST');
section2=2;
var log_var2='log_id\\,'+ section2;
$( '#'+ log_var2 ).val('TEST2');
});  

</script>
<style type="text/css">
</style>
</head>
<body>
<input id="log_id,1" type="text" />
<input id="log_id,2" type="text" />
</body>
</html>

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0
 
LVL 61

Expert Comment

by:Julian Hansen
ID: 39870082
@Scott

You are correct - my test case excluded the comma in the input
0
 
LVL 58

Expert Comment

by:Gary
ID: 39928573
I've requested that this question be closed as follows:

Accepted answer: 500 points for padas's comment #a39869938

for the following reason:

This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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Author Closing Comment

by:jellydeal
ID: 39928574
Thank you
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