only-child selector

Description: Selects all elements that are the only child of their parent.

version added: 1.1.4jQuery( ":only-child" )

If the parent has other child elements, nothing is matched.

Example:

Change the text and add a border for each button that is the only child of its parent.

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>only-child demo</title>
  <style>
  div {
    width: 100px;
    height: 80px;
    margin: 5px;
    float: left;
    background: #b9e;
  }
  </style>
  <script src="https://code.jquery.com/jquery-4.0.0.js"></script>
</head>
<body>
<div>
  <button>Sibling!</button>
  <button>Sibling!</button>
</div>
<div>
  <button>Sibling!</button>
</div>
<div>
  None
</div>
<div>
  <button>Sibling!</button>
  <button>Sibling!</button>
  <button>Sibling!</button>
</div>
<div>
  <button>Sibling!</button>
</div>
<script>
$( "div button:only-child" ).text( "Alone" ).css( "border", "2px blue solid" );
</script>
</body>
</html>

only-child selector

version added: 1.1.4jQuery( ":only-child" )

Demo: