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Setting “checked” for a checkbox with jQuery? 38 answers

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You're using the wrong method, you should be using prop

$(document).ready(function() {
    $('#CHECK-ALL').click(function() {
        if ($(this).is(':checked')) {
            $('#P').prop('checked',true);                
        } else {
            $('#P').prop('checked',false);                
        }
    });
});

Your code could be reduced to

$('#CHECK-ALL').click(function() {
    $('#P').prop('checked', this.checked);                
});

When you set the attribute, it works fine, but it doesn't change the property, so the next time you check $(this).is(':checked') it's still unchecked, as that checks the property, not the attribute, which is why it's not working.

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