# .slideDown()

## slideDown ( ) Returns: jQuery version added: 1.0

## slideDown ( ) Returns: jQuery version added: 1.4.3

Description: Display the matched elements with a sliding motion.

The `.slideDown()` method animates the height of the matched elements. This causes lower parts of the page to slide down, making way for the revealed items.

Durations are given in milliseconds; higher values indicate slower animations, not faster ones. The strings `'fast'` and `'slow'` can be supplied to indicate durations of `200` and `600` milliseconds, respectively. If any other string is supplied, or if the `duration` parameter is omitted, the default duration of `400` milliseconds is used.

We can animate any element, such as a simple image:

    <div id="clickme">
      Click here
    </div>
    <img id="book" src="book.png" alt="" width="100" height="123">

With the element initially hidden, we can show it slowly:

    $( "#clickme" ).click(function() {
      $( "#book" ).slideDown( "slow", function() {
        // Animation complete.
      });
    });

#### Easing

As of jQuery 1.4.3, an optional string naming an easing function may be used. Easing functions specify the speed at which the animation progresses at different points within the animation. The only easing implementations in the jQuery library are the default, called `swing`, and one that progresses at a constant pace, called `linear`. More easing functions are available with the use of plug-ins, most notably the jQuery UI suite.

#### Callback Function

If supplied, the callback is fired once the animation is complete. This can be useful for stringing different animations together in sequence. The callback is not sent any arguments, but `this` is set to the DOM element being animated. If multiple elements are animated, it is important to note that the callback is executed once per matched element, not once for the animation as a whole.

As of jQuery 1.6, the `.promise()` method can be used in conjunction with the `deferred.done()` method to execute a single callback for the animation as a whole when all matching elements have completed their animations ( See the example for .promise() ).

## Examples:

#### Example: Animates all divs to slide down and show themselves over 600 milliseconds.

    <!doctype html>
    <html lang="en">
    <head>
      <meta charset="utf-8">
      <title>css demo</title>

      <style>

      div {
        background: #de9a44;
        margin: 3px;
        width: 80px;
        height: 40px;
        display: none;
        float: left;
      }

      </style>

      <script src="//code.jquery.com/jquery-1.10.2.js"></script>
    </head>
    <body>

    Click me!
    <div></div>
    <div></div>
    <div></div>

    <script>

    $( document.body ).click(function () {
      if ( $( "div:first" ).is( ":hidden" ) ) {
        $( "div" ).slideDown( "slow" );
      } else {
        $( "div" ).hide();
      }
    });

    </script>

    </body>
    </html>

#### Demo:

#### Example: Animates all inputs to slide down, completing the animation within 1000 milliseconds. Once the animation is done, the input look is changed especially if it is the middle input which gets the focus.

    <!doctype html>
    <html lang="en">
    <head>
      <meta charset="utf-8">
      <title>css demo</title>

      <style>

      div {
        background: #cfd;
        margin: 3px;
        width: 50px;
        text-align: center;
        float: left;
        cursor: pointer;
        border: 2px outset black;
        font-weight: bolder;
      }
      input {
        display: none;
        width: 120px;
        float: left;
        margin: 10px;
      }

      </style>

      <script src="//code.jquery.com/jquery-1.10.2.js"></script>
    </head>
    <body>

    <div>Push!</div>
    <input type="text">
    <input type="text" class="middle">
    <input type="text">

    <script>

    $( "div" ).click(function() {
      $( this ).css({
        borderStyle: "inset",
        cursor: "wait"
      });
      $( "input" ).slideDown( 1000, function() {
        $( this )
          .css( "border", "2px red inset" )
          .filter( ".middle" )
            .css( "background", "yellow" )
            .focus();
        $( "div" ).css( "visibility", "hidden" );
      });
    });

    </script>

    </body>
    </html>

#### Demo: