:checked Selector

Categories: Selectors > Form Chinese Translation: :checked Selector

checked selector

Description: Matches all elements that are checked or selected.

  • version added: 1.0jQuery( ":checked" )

The :checked selector works for checkboxes, radio buttons, and options of select elements.

To retrieve only the selected options of select elements, use the :selected selector.

Examples:

Determine how many input elements are checked.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
 
<!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>

Demo:

Identify the checked radio input.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
 
<!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>

Demo: