SO - 18611580

by Arun P Johny

HTML

<div id="page-container">
    <div class="do-something">1</div>
    <div class="do-something">2</div>
    <div class="do-something">3</div>
</div>
<div class="some-class">
    <div class="do-something">1</div>
    <div class="do-something">2</div>
    <div class="do-something">3</div>
</div>

JavaScript

$('#page-container, .some-class').on('click', '.do-something', function (event) {
    var isSomeClass = $(this).closest('.some-class').length > 0;
    console.log(isSomeClass)
});