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How do I set a hidden input in jQuery?

Posted on 2014-10-21
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Last Modified: 2014-10-22
Experts,

I need to set an hidden input's value to 0 in order to trigger an SQL insert statement. The button click
event and $("contact_id").val(0) executes, but the element value still remains 27.

I've tried various corrections: $("contact_id").attr('value', 0) or $("contact_id").prop('value', 0) but the id does not change!

What am I missing?
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Question by:Glen Gibb
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Expert Comment

by:leakim971
ID: 40396137
you need to add the hash to select the hidden input by it's ID attribute :

$("#contact_id").val(0);

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Accepted Solution

by:
leakim971 earned 500 total points
ID: 40396139
more info here :
http://api.jquery.com/id-selector/

and here for the others selectors :
http://api.jquery.com/category/selectors/
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Author Comment

by:Glen Gibb
ID: 40397443
Whoops.  That's a typo.  The hash is actually there in my code.  

The code did read, $('#contact_id').val(0).  But no value actually changed.  I have used this expression successfully forever, but here the selector just doesn't work.

I have it working with $('input[name=contactId]').val(0) which I found on a competing site.

My problem is code that doesn't work as advertised.  I've spent untold hours on this.  Why will the selector work with the name, but not with the id as expected?
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LVL 82

Expert Comment

by:leakim971
ID: 40397482
<input type="hidden" name="contactNameAttributeValue" id="contactIdValue" value="1234" />

$('input[name=contactNameAttributeValue]').val("selected by name"); // you may have more than one field with the same ame attribute
$('#contactIdValue').val("selected by Id"); // Id attribute must be unique in a document

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to change value you MUST wait the total loading of the page using :

$(document).ready(function() {
    $('#contactId').val( 0 ); // we use the Id attribute : <input type="hidden" id="contactId"
});
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Author Comment

by:Glen Gibb
ID: 40397856
Page is already loaded when this block executes on "Add" button click.  Id of 0 triggers an insert (else update.)

Appreciate the suggestion of the double id or name attribute.  Searched both the code and the page source to verify there were no doubles of either name nor id.

The element is, <input type="hidden" class="id" id="contact_id" name="contactId">.

However, $("#contact_id").val(0); doesn't set the value.  I think it ought to, but it still doesn't!
0
 

Author Comment

by:Glen Gibb
ID: 40397880
Thanks, leakim.  You're right as always!  I tried to compose the selector (x + '_id').val.(0) but neglected the hash -- '#' + x + '_id.
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