.hover()

Bind two handlers to the matched elements, to be executed when the mouse pointer enters and leaves the elements.

The .hover() method binds handlers for both mouseenter and mouseleave events. You can use it to simply apply behavior to an element during the time the mouse is within the element.

Calling $( selector ).hover( handlerIn, handlerOut ) is shorthand for:

$( selector ).mouseenter( handlerIn ).mouseleave( handlerOut );

See the discussions for .mouseenter() and .mouseleave() for more details.

version added: 1.0
handlerIn
Function( Event eventObject )

A function to execute when the mouse pointer enters the element.

handlerOut
Function( Event eventObject )

A function to execute when the mouse pointer leaves the element.

Examples:

To add a special style to list items that are being hovered over, try:

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>hover demo</title>
  <style>
  ul {
    margin-left: 20px;
    color: blue;
  }
  li {
    cursor: default;
  }
  span {
    color: red;
  }
  </style>
  <script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
 
<ul>
  <li>Milk</li>
  <li>Bread</li>
  <li class="fade">Chips</li>
  <li class="fade">Socks</li>
</ul>
 
<script>
$( "li" ).hover(
  function() {
    $( this ).append( $( "<span> ***</span>" ) );
  }, function() {
    $( this ).find( "span:last" ).remove();
  }
);
 
$( "li.fade" ).hover(function() {
  $( this ).fadeOut( 100 );
  $( this ).fadeIn( 500 );
});
</script>
 
</body>
</html>

To add a special style to table cells that are being hovered over, try:

$( "td" ).hover(
  function() {
    $( this ).addClass( "hover" );
  }, function() {
    $( this ).removeClass( "hover" );
  }
);

To unbind the above example use:

$( "td" ).off( "mouseenter mouseleave" );
Bind a single handler to the matched elements, to be executed when the mouse pointer enters or leaves the elements.

The .hover() method, when passed a single function, will execute that handler for both mouseenter and mouseleave events. This allows the user to use jQuery's various toggle methods within the handler or to respond differently within the handler depending on the event.type.

Calling $(selector).hover(handlerInOut) is shorthand for:

$( selector ).on( "mouseenter mouseleave", handlerInOut );

See the discussions for .mouseenter() and .mouseleave() for more details.

version added: 1.4
handlerInOut
Function( Event eventObject )

A function to execute when the mouse pointer enters or leaves the element.

Examples:

Slide the next sibling LI up or down on hover, and toggle a class.

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>hover demo</title>
  <style>
  ul {
    margin-left: 20px;
    color: blue;
  }
  li {
    cursor: default;
  }
  li.active {
    background: black;
    color: white;
  }
  span {
    color:red;
  }
  </style>
  <script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
 
<ul>
  <li>Milk</li>
  <li>White</li>
  <li>Carrots</li>
  <li>Orange</li>
  <li>Broccoli</li>
  <li>Green</li>
</ul>
 
<script>
$( "li" )
  .filter( ":odd" )
    .hide()
  .end()
  .filter( ":even" )
    .hover(function() {
      $( this )
        .toggleClass( "active" )
        .next()
          .stop( true, true )
          .slideToggle();
    });
</script>
 
</body>
</html>
doc_jQuery
2016-03-27 13:48:25
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