:checked Selector

checked selector

描述: 匹配所有勾选的元素。

  • 添加的版本: 1.0jQuery( ":checked" )

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。

例子:

Example: 确定有多少input元素是选中的.

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<!DOCTYPE html>
<html>
<head>
  <style>
  div { color:red; }
  </style>
  <script src="http://cdn.bootcss.com/jquery/1.11.0/jquery.min.js"></script>
</head>
<body>
 
<form>
  <p>
    <input type="checkbox" name="newsletter" value="Hourly" checked="checked">
 
    <input type="checkbox" name="newsletter" value="Daily">
    <input type="checkbox" name="newsletter" value="Weekly">
 
    <input type="checkbox" name="newsletter" value="Monthly" checked>
    <input type="checkbox" name="newsletter" value="Yearly">
  </p>
</form>
<div></div>
 
<script>
var countChecked = function() {
  var n = $( "input:checked" ).length;
  $( "div" ).text( n + (n === 1 ? " is" : " are") + " checked!" );
};
countChecked();
 
$( "input[type=checkbox]" ).on( "click", countChecked );
</script>
 
</body>
</html>

Demo:

Example: Identify the checked radio input.

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<!DOCTYPE html>
<html>
<head>
  <style>
input, label { line-height: 1.5em; }
</style>
  <script src="http://cdn.bootcss.com/jquery/1.11.0/jquery.min.js"></script>
</head>
<body>
 
<form>
  <div>
    <input type="radio" name="fruit" value="orange" id="orange">
    <label for="orange">orange</label>
  </div>
  <div>
    <input type="radio" name="fruit" value="apple" id="apple">
    <label for="apple">apple</label>
  </div>
  <div>
    <input type="radio" name="fruit" value="banana" id="banana">
    <label for="banana">banana</label>
  </div>
  <div id="log"></div>
</form>
 
<script>
$( "input" ).on( "click", function() {
  $( "#log" ).html( $("input:checked").val() + " is checked!" );
});
</script>
 
</body>
</html>

Demo: