jQuery and chexkbox

Whenever I need to use jquery with checkbox different functionality I always search for different sites to get my answer so I decided to write a small article to keep all the jquery functionality with checkbox at a single place, so trying to keep everything here.

To get a checkbox on a page use

1. $(':checkbox')
2. $('[type=checkbox]')
3. $('*:checkbox')
4. $('input:checkbox')

For better performance in modern browsers [type="checkbox"]

To Check and Un-Check by using class name and Id

jQuery 1.6+

$('.classname').prop('checked', true);
$('.classname').prop('checked', false);

$('#checkboxid').prop('checked', true);
$('#checkboxid').prop('checked', false); 

jQuery 1.5 and below

$('.classname').attr('checked', 'checked');
$('.classname').removeAttr('checked');

$('#checkboxid').attr('checked', 'checked');
$('#checkboxid').removeAttr('checked');        

Check the checkbox is Checked or Un-Checked

$('.classname').is(':checked');
$('#checkboxid').is(':checked');    

Checkbox Click

$('#checkboxid').click(function() {
    if ($(this).is(':checked')) 
       alert('Checked');
    else
       alert('Not Checked');  
 });

If you are using Update panel then after asynchronous postback it will not work, so to fix it use live like this

$('#checkboxid').live("click", function() {
    if ($(this).is(':checked')) 
       alert('Checked');
    else
       alert('Not Checked');  
 });

Total checked checkbox on page

 var TotalChecked = $("input:checked").length;

Let me know if I am missing anything here.

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