jquery checkbox onchange if checked code example

Example 1: How to check whether a checkbox is checked in jQuery?

//using plane javascript 
if(document.getElementById('on_or_off_checkbox').checked) {
    //I am checked
} 

//using jQuery
if($('#on_or_off_checkbox').is(':checked')){
    //I am checked
}

Example 2: oncheck event jquery

$(".checkbox").change(function() {
    if(this.checked) {
        //Do stuff
    }
});

Example 3: check if checkbox is checked jquery

var $boxes = $('input[name=thename]:checked');