javascript check if checkbox is 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: How do I check whether a checkbox is checked in jQuery?

$('#' + id).is(":checked")

Example 3: check whether a checkbox is checked in jQuery

if ($('#grepperRocks').is(':checked')) {
	// this checkbox is checked
}

Example 4: if checkbox is checked

if ($('#id_input').is(':checked')) { }

Example 5: jquery check if checkbox is checked

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

Example 6: how to check input is selected or not

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