v3shin

$('.selector').change(function () {
    alert("change: " + $(this).val());
});

document.querySelector('#myForm').addEventListener('change', function(e) {
    console.log(e.target);
});

<label for="tab1">tab1 button</label><br>
<label for="tab2">tab2 button</label><br>
<label for="tab3">tab3 button</label><br>

<div class="tab">
    <input type="radio" name="tabRadio" id="tab1" class="tab__radio">
    <div class="tab__content">tab1 content</div>
</div>
<div class="tab">
    <input type="radio" name="tabRadio" id="tab2" class="tab__radio">
    <div class="tab__content">tab2 content</div>
</div>
<div class="tab">
    <input type="radio" name="tabRadio" id="tab3" class="tab__radio">
    <div class="tab__content">tab3 content</div>
</div>

<style>
.tab .tab__radio,
.tab .tab__content {
    display: none;
}
.tab .tab__radio:checked + .tab__content {
    display: block;
}
</style>