# :odd Selector

Categories: Selectors > Basic Filter | Selectors > jQuery Extensions

## odd selector

#### version added: 1.0jQuery(':odd')

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

In particular, note that the 0-based indexing means that, counter-intuitively, `:odd` selects the second element, fourth element, and so on within the matched set.

### Additional Notes:

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

### Example:

#### Finds odd table rows, matching the second, fourth and so on (index 1, 3, 5 etc.).

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

      table {
        background:#f3f7f5;
      }
      </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:odd").css("background-color", "#bbbbff");</script>

    </body>
    </html>

#### Demo: