/Javascript/jQuery/Jquery check if checkbox is checked

Jquery check if checkbox is checked

//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
}

Jquery checkbox checked value

if ($('#check_id').is(":checked"))
{
  // it is checked
}

Source: stackoverflow.com

Jquery if checkbox checked

$( "SELECTOR" ).attr( "checked" )  // Returns ‘true’ if present on the element, returns undefined if not present
$( "SELECTOR" ).prop( "checked" ) // Returns true if checked, false if unchecked.
$( "SELECTOR" ).is( ":checked" ) // Returns true if checked, false if unchecked.

Jquery check if checkbox is checked

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

Jquery detect when a checkbox is checked

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

Source: stackoverflow.com

Jquery check if checkbox is checked

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

Source: stackoverflow.com

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Check your page, maybe you import jQuery library twice, the slim version or it is missing.
Javascript jQuery