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To get the checkbox value in JavaScript, you can use the ?document. querySelectorAll()? method to select the specified checkboxes or the ?document. getElementById? method to get the ?id? against each of the selected checkboxes and display its corresponding value.

In JavaScript, we can access the checkbox element using id, class, or tag name and apply '. checked' to the element, which returns either true or false based on the checkbox is checked.

A checkbox cannot be set to indeterminate state by an HTML attribute - it must be set by a JavaScript. This state can be used to force the user to check or uncheck the checkbox.

You need to use . index(element) to find elements index in the list. If no argument is passed to the . index() method, the return value is an integer indicating the position of the first element within the jQuery object relative to its sibling elements.

In the above code, Create the function checkClickFunc() which is to be executed upon clicking the checkbox. Using the ?getElementById()? method, retrieve the checkbox by its id, ?agree?. Check the checkbox's status by using the ?checked? attribute. If it's ?true?, show an alert message ?Checkbox is clicked?.

Different JavaScript codes to get marked checkboxes value <script> document.getElementById('btn').onclick = function() { var markedCheckbox = document.getElementsByName('pl'); for (var checkbox of markedCheckbox) { if (checkbox.checked) document.body.append(checkbox.value + ' '); } }

Input Checkbox value Property Return the value of the value attribute of a checkbox: getElementById("myCheck"). value; ... Change the value associated with the checkbox: document. getElementById("myCheck"). ... Submitting a form - how to change the value associated with the checkbox: document. getElementById("myCheck").