JAVASCRIPT

jquery watch checkbox change

$('input[type="checkbox"]').change(function() {
    alert ("The element with id " + this.id + " changed.");
});

jquery on checkbox change

//jQuery listen for checkbox change
$("#myCheckBoxID").change(function() {
    if(this.checked) {
        //I am checked
    }else{
        //I'm not checked
    }
});

checkbox state change using Jquery

$( elem ).prop( "checked" )