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:even Selector

Categories: Selectors > Basic Filter | Selectors > jQuery Extensions

even selector

version added: 1.0jQuery(':even')

Description: Selects even elements, zero-indexed. See also odd.

In particular, note that the 0-based indexing means that, counter-intuitively, :even selects the first element, third element, and so on within the matched set.

Additional Notes:

  • Because :even is a jQuery extension and not part of the CSS specification, queries using :even cannot take advantage of the performance boost provided by the native DOM querySelectorAll() method. To achieve the best performance when using :even to select elements, first select the elements using a pure CSS selector, then use .filter(":even").

Example:

Finds even table rows, matching the first, third and so on (index 0, 2, 4 etc.).

<!DOCTYPE html>
<html>
<head>
  <style>

  table {
    background:#eeeeee;
  }
  </style>
  <script src="http://code.jquery.com/jquery-1.7rc2.js"></script>
</head>
<body>
  <table border="1">
    <tr><td>Row with Index #0</td></tr>
    <tr><td>Row with Index #1</td></tr>

    <tr><td>Row with Index #2</td></tr>
    <tr><td>Row with Index #3</td></tr>
  </table>
<script>$("tr:even").css("background-color", "#bbbbff");</script>

</body>
</html>
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