:checked Selector

checked selector

version added: 1.0jQuery(':checked')

描述: 选择所有勾选的元素。

这个 :checked 选择器适用于复选框和单选框。对于下拉框元素, 使用 :selected 选择器。

Example:

Finds all input elements that are checked.

<!DOCTYPE html>
<html>
<head>
  <style>
  div { color:red; }
  </style>
  <script src="http://code.jquery.com/jquery-latest.min.js"></script>
</head>
<body>
  <form>
    <input type="checkbox" name="newsletter" checked="checked" value="Hourly" />

    <input type="checkbox" name="newsletter" value="Daily" />
    <input type="checkbox" name="newsletter" value="Weekly" />

    <input type="checkbox" name="newsletter" checked="checked" value="Monthly" />
    <input type="checkbox" name="newsletter" value="Yearly" />

  </form>
  <div></div>
<script>

    function countChecked() {
      var n = $("input:checked").length;
      $("div").text(n + (n <= 1 ? " is" : " are") + " checked!");
    }
    countChecked();
    $(":checkbox").click(countChecked);

</script>

</body>
</html>

Demo:

Result:

<input type="checkbox" name="newsletter" checked="checked" value="Daily" />,
  <input type="checkbox" name="newsletter" checked="checked" value="Monthly" /> ]
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