Примеры для jQuery .val()

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Get the single value from a single select and an array of values from a multiple select and display their values.

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<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>val demo</title>
  <style>
  p {
    color: red;
    margin: 4px;
  }
  b {
    color: blue;
  }
  </style>
  <script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
 
<p></p>
 
<select id="single">
  <option>Single</option>
  <option>Single2</option>
</select>
 
<select id="multiple" multiple="multiple">
  <option selected="selected">Multiple</option>
  <option>Multiple2</option>
  <option selected="selected">Multiple3</option>
</select>
 
<script>
function displayVals() {
  var singleValues = $( "#single" ).val();
  var multipleValues = $( "#multiple" ).val() || [];
  // When using jQuery 3:
  // var multipleValues = $( "#multiple" ).val();
  $( "p" ).html( "<b>Single:</b> " + singleValues +
    " <b>Multiple:</b> " + multipleValues.join( ", " ) );
}
 
$( "select" ).change( displayVals );
displayVals();
</script>
 
</body>
</html>

Демонстрация:

Find the value of an input box.

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<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>val demo</title>
  <style>
  p {
    color: blue;
    margin: 8px;
  }
  </style>
  <script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
 
<input type="text" value="some text">
<p></p>
 
<script>
$( "input" )
  .keyup(function() {
    var value = $( this ).val();
    $( "p" ).text( value );
  })
  .keyup();
</script>
 
</body>
</html>

Демонстрация:

Set the value of an input box.

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<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>val demo</title>
  <style>
  button {
    margin: 4px;
    cursor: pointer;
  }
  input {
    margin: 4px;
    color: blue;
  }
  </style>
  <script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
 
<div>
  <button>Feed</button>
  <button>the</button>
  <button>Input</button>
</div>
<input type="text" value="click a button">
 
<script>
$( "button" ).click(function() {
  var text = $( this ).text();
  $( "input" ).val( text );
});
</script>
 
</body>
</html>

Демонстрация:

Use the function argument to modify the value of an input box.

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<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>val demo</title>
  <script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
 
<p>Type something and then click or tab out of the input.</p>
<input type="text" value="type something">
 
<script>
$( "input" ).on( "blur", function() {
  $( this ).val(function( i, val ) {
    return val.toUpperCase();
  });
});
</script>
 
</body>
</html>

Демонстрация:

Set a single select, a multiple select, checkboxes and a radio button .

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<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>val demo</title>
  <style>
  body {
    color: blue;
  }
  </style>
  <script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
 
<select id="single">
  <option>Single</option>
  <option>Single2</option>
</select>
 
<select id="multiple" multiple="multiple">
  <option selected="selected">Multiple</option>
  <option>Multiple2</option>
  <option selected="selected">Multiple3</option>
</select>
 
<br>
<input type="checkbox" name="checkboxname" value="check1"> check1
<input type="checkbox" name="checkboxname" value="check2"> check2
<input type="radio" name="r" value="radio1"> radio1
<input type="radio" name="r" value="radio2"> radio2
 
<script>
$( "#single" ).val( "Single2" );
$( "#multiple" ).val([ "Multiple2", "Multiple3" ]);
$( "input").val([ "check1", "check2", "radio1" ]);
</script>
 
</body>
</html>

Демонстрация: