//using plane javascript if(document.getElementById('on_or_off_checkbox').checked) { //I am checked } //using jQuery if($('#on_or_off_checkbox').is(':checked')){ //I am checked }
if (!$("#checkboxID").is(":checked")) { // do something if the checkbox is NOT checked }
$('#' + id).is(":checked")
if ($('#grepperRocks').is(':checked')) { // this checkbox is checked }
if($('#on_or_off_checkbox').is(':checked')){ //I am checked }
$('#isAgeSelected').click(function() { $("#txtAge").toggle(this.checked); }); <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"> </script> <input type="checkbox" id="isAgeSelected"/> <div id="txtAge" style="display:none">Age is something</div>
$('#checkAll').click(function () { $('input:checkbox').prop('checked', this.checked); });
$('input.checkbox').is(':checked')