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:checked


概述    checked selector

返回值:Array<Element(s)>

描述:匹配所有勾选的元素。

  • V : 1.0jQuery( ":checked" )

这个 :checked 选择器适用于复选框 (checkbox) ,单选框(radio button),和select元素的option元素。

对于检索select元素选中的选择项(option), 请使用 :selected 选择器。

示例

实例

查找所有选中的复选框元素

HTML 代码:
<form>
  <input type="checkbox" name="newsletter" checked="checked" value="Daily" />
  <input type="checkbox" name="newsletter" value="Weekly" />
  <input type="checkbox" name="newsletter" checked="checked" value="Monthly" />
</form>
jQuery 代码:
$("input:checked")
结果:
[ <input type="checkbox" name="newsletter" checked="checked" value="Daily" />, <input type="checkbox" name="newsletter" checked="checked" value="Monthly" /> ]

实例

确定有多少input元素是选中的.

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>checked demo</title>
  <style>
  div {
    color: red;
  }
  </style>
  <script src="https://code.jquery.com/jquery-1.10.2.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>

运行一下

实例

Identify the checked radio input.

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>checked demo</title>
  <style>
  input, label {
    line-height: 1.5em;
  }
  </style>
  <script src="https://code.jquery.com/jquery-1.10.2.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>

运行一下


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