javascript on checkbox checked code example

Example 1: oncheck event jquery

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

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");
   }
}

Example 3: html checkbox checked

<input type="checkbox" name="ok" value="ok">
<label for="ok">I agree</label>