:odd selector

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.

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").
Selected elements are in the order of their appearance in the document.

jQuery( ":odd" )

version added: 1.0

Examples:

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

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>odd demo</title>
  <style>
  table {
    background: #f3f7f5;
  }
  </style>
  <script src="https://code.jquery.com/jquery-1.10.2.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>

Links:

http://api.jquery.com/odd-selector

doc_jQuery

2016-03-27 13:48:51

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