Javascript checkbox onChange

Question

I have a checkbox in a form and I\'d like it to work according to following scenario:

• if someone checks it, the value of a textfield (totalCost)

Answer 1

The following solution makes use of jquery. Let's assume you have a checkbox with id of checkboxId.

const checkbox = $("#checkboxId");

checkbox.change(function(event) {
    var checkbox = event.target;
    if (checkbox.checked) {
        //Checkbox has been checked
    } else {
        //Checkbox has been unchecked
    }
});