checkbox event in javascript code example

Example 1: javascript event listener checkbox

//js
var checkbox = document.querySelector("input[name=checkbox]");

checkbox.addEventListener( 'change', function() {
    if(this.checked) {
        // Checkbox is checked..
    } else {
        // Checkbox is not checked..
    }
});

//jquery
$('input[name=checkbox]').change(function(){
    if($(this).is(':checked')) {
        // Checkbox is checked..
    } else {
        // Checkbox is not checked..
    }
});

Example 2: oncheck checkbox javascript

<input type='checkbox' onchange='handleChange(this);'> Checkbox

function handleChange(checkbox) {
    if(checkbox.checked == true){
        document.getElementById("submit").removeAttribute("disabled");
    }else{
        document.getElementById("submit").setAttribute("disabled", "disabled");
   }
}