change checkbox checked in jquery code example
Example 1: jquery set checkbox checked
//jQuery 1.6+ use
$('.checkbox').prop('checked', true);
//jQuery 1.5.x and below use
$('.checkbox').attr('checked', true);
Example 2: jquery set checkbox
//jQuery 1.6+ use:
$('.checkboxClass').prop('checked', true);
//jQuery 1.5.x and below use:
$('.checkboxClass').attr('checked', true);