jQuery UI & Draggable: Events

This entry is part 8 of 11 in the series jQuery UI Draggable

jQuery UI Draggable – Events

Layer functionality onto the draggable using the startdrag, and stop events. Start is fired at the start of the drag; drag during the drag; and stop when dragging stops.

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>jQuery UI Draggable - Events</title>
    <link rel="stylesheet" href="//code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css">
    <script src="//code.jquery.com/jquery-1.9.1.js"></script>
    <script src="//code.jquery.com/ui/1.10.4/jquery-ui.js"></script>
    <style>
        #draggable { width: 16em; padding: 0 1em; }
        #draggable ul li { margin: 1em 0; padding: 0.5em 0; } * html #draggable ul li { height: 1%; }
        #draggable ul li span.ui-icon { float: left; }
        #draggable ul li span.count { font-weight: bold; }
    </style>
    <script>
        $(function() {
            var $start_counter = $( "#event-start" ),
                    $drag_counter = $( "#event-drag" ),
                    $stop_counter = $( "#event-stop" ),
                    counts = [ 0, 0, 0 ];

            $( "#draggable" ).draggable({
                start: function() {
                    counts[ 0 ]++;
                    updateCounterStatus( $start_counter, counts[ 0 ] );
                },
                drag: function() {
                    counts[ 1 ]++;
                    updateCounterStatus( $drag_counter, counts[ 1 ] );
                },
                stop: function() {
                    counts[ 2 ]++;
                    updateCounterStatus( $stop_counter, counts[ 2 ] );
                }
            });

            function updateCounterStatus( $event_counter, new_count ) {
                // first update the status visually...
                if ( !$event_counter.hasClass( "ui-state-hover" ) ) {
                    $event_counter.addClass( "ui-state-hover" )
                            .siblings().removeClass( "ui-state-hover" );
                }
                // ...then update the numbers
                $( "span.count", $event_counter ).text( new_count );
            }
        });
    </script>
</head>
<body>

<div id="draggable" class="ui-widget ui-widget-content">

    <p>Drag me to trigger the chain of events.</p>

    <ul class="ui-helper-reset">
        <li id="event-start" class="ui-state-default ui-corner-all"><span class="ui-icon ui-icon-play"></span>"start" invoked <span class="count">0</span>x</li>
        <li id="event-drag" class="ui-state-default ui-corner-all"><span class="ui-icon ui-icon-arrow-4"></span>"drag" invoked <span class="count">0</span>x</li>
        <li id="event-stop" class="ui-state-default ui-corner-all"><span class="ui-icon ui-icon-stop"></span>"stop" invoked <span class="count">0</span>x</li>
    </ul>
</div>


</body>
</html>
Try The Code

There are actually 4 events in draggable,  start, drag, stop and create.

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