Droppable 拖拽实例

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  <title>jQuery UI Droppable - Simple photo manager</title>

  <link rel="stylesheet" href="//code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css">

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

  <script src="//code.jquery.com/ui/1.11.4/jquery-ui.js"></script>

  <link rel="stylesheet" href="/resources/demos/style.css">

  <style>

  #gallery { float: left; width: 65%; min-height: 12em; }

  .gallery.custom-state-active { background: #eee; }

  .gallery li { float: left; width: 96px; padding: 0.4em; margin: 0 0.4em 0.4em 0; text-align: center; }

  .gallery li h5 { margin: 0 0 0.4em; cursor: move; }

  .gallery li a { float: right; }

  .gallery li a.ui-icon-zoomin { float: left; }

  .gallery li img { width: 100%; cursor: move; }

 

  #trash { float: right; width: 32%; min-height: 18em; padding: 1%; }

  #trash h4 { line-height: 16px; margin: 0 0 0.4em; }

  #trash h4 .ui-icon { float: left; }

  #trash .gallery h5 { display: none; }

  </style>

  <script>

  $(function() {

    // there's the gallery and the trash

    var $gallery = $( "#gallery" ),

      $trash = $( "#trash" );

 

    // let the gallery items be draggable

    $( "li", $gallery ).draggable({

      cancel: "a.ui-icon", // clicking an icon won't initiate dragging

      revert: "invalid", // when not dropped, the item will revert back to its initial position

      containment: "document",

      helper: "clone",

      cursor: "move"

    });

 

    // let the trash be droppable, accepting the gallery items

    $trash.droppable({

      accept: "#gallery > li",

      activeClass: "ui-state-highlight",

      drop: function( event, ui ) {

        deleteImage( ui.draggable );

      }

    });

 

    // let the gallery be droppable as well, accepting items from the trash

    $gallery.droppable({

      accept: "#trash li",

      activeClass: "custom-state-active",

      drop: function( event, ui ) {

        recycleImage( ui.draggable );

      }

    });

 

    // image deletion function

    var recycle_icon = "<a href='link/to/recycle/script/when/we/have/js/off' title='Recycle this image' class='ui-icon ui-icon-refresh'>Recycle image</a>";

    function deleteImage( $item ) {

      $item.fadeOut(function() {

        var $list = $( "ul", $trash ).length ?

          $( "ul", $trash ) :

          $( "<ul class='gallery ui-helper-reset'/>" ).appendTo( $trash );

 

        $item.find( "a.ui-icon-trash" ).remove();

        $item.append( recycle_icon ).appendTo( $list ).fadeIn(function() {

          $item

            .animate({ width: "48px" })

            .find( "img" )

              .animate({ height: "36px" });

        });

      });

    }

 

    // image recycle function

    var trash_icon = "<a href='link/to/trash/script/when/we/have/js/off' title='Delete this image' class='ui-icon ui-icon-trash'>Delete image</a>";

    function recycleImage( $item ) {

      $item.fadeOut(function() {

        $item

          .find( "a.ui-icon-refresh" )

            .remove()

          .end()

          .css( "width", "96px")

          .append( trash_icon )

          .find( "img" )

            .css( "height", "72px" )

          .end()

          .appendTo( $gallery )

          .fadeIn();

      });

    }

 

    // image preview function, demonstrating the ui.dialog used as a modal window

    function viewLargerImage( $link ) {

      var src = $link.attr( "href" ),

        title = $link.siblings( "img" ).attr( "alt" ),

        $modal = $( "img[src$='" + src + "']" );

 

      if ( $modal.length ) {

        $modal.dialog( "open" );

      } else {

        var img = $( "<img alt='" + title + "' width='384' height='288' style='display: none; padding: 8px;' />" )

          .attr( "src", src ).appendTo( "body" );

        setTimeout(function() {

          img.dialog({

            title: title,

            width: 400,

            modal: true

          });

        }, 1 );

      }

    }

 

    // resolve the icons behavior with event delegation

    $( "ul.gallery > li" ).click(function( event ) {

      var $item = $( this ),

        $target = $( event.target );

 

      if ( $target.is( "a.ui-icon-trash" ) ) {

        deleteImage( $item );

      } else if ( $target.is( "a.ui-icon-zoomin" ) ) {

        viewLargerImage( $target );

      } else if ( $target.is( "a.ui-icon-refresh" ) ) {

        recycleImage( $item );

      }

 

      return false;

    });

  });

  </script>

</head>

<body>

 

<div class="ui-widget ui-helper-clearfix">

 

<ul id="gallery" class="gallery ui-helper-reset ui-helper-clearfix">

  <li class="ui-widget-content ui-corner-tr">

    <h5 class="ui-widget-header">High Tatras</h5>

    <img src="images/high_tatras_min.jpg" alt="The peaks of High Tatras" width="96" height="72">

    <a href="images/high_tatras.jpg" title="View larger image" class="ui-icon ui-icon-zoomin">View larger</a>

    <a href="link/to/trash/script/when/we/have/js/off" title="Delete this image" class="ui-icon ui-icon-trash">Delete image</a>

  </li>

  <li class="ui-widget-content ui-corner-tr">

    <h5 class="ui-widget-header">High Tatras 2</h5>

    <img src="images/high_tatras2_min.jpg" alt="The chalet at the Green mountain lake" width="96" height="72">

    <a href="images/high_tatras2.jpg" title="View larger image" class="ui-icon ui-icon-zoomin">View larger</a>

    <a href="link/to/trash/script/when/we/have/js/off" title="Delete this image" class="ui-icon ui-icon-trash">Delete image</a>

  </li>

  <li class="ui-widget-content ui-corner-tr">

    <h5 class="ui-widget-header">High Tatras 3</h5>

    <img src="images/high_tatras3_min.jpg" alt="Planning the ascent" width="96" height="72">

    <a href="images/high_tatras3.jpg" title="View larger image" class="ui-icon ui-icon-zoomin">View larger</a>

    <a href="link/to/trash/script/when/we/have/js/off" title="Delete this image" class="ui-icon ui-icon-trash">Delete image</a>

  </li>

  <li class="ui-widget-content ui-corner-tr">

    <h5 class="ui-widget-header">High Tatras 4</h5>

    <img src="images/high_tatras4_min.jpg" alt="On top of Kozi kopka" width="96" height="72">

    <a href="images/high_tatras4.jpg" title="View larger image" class="ui-icon ui-icon-zoomin">View larger</a>

    <a href="link/to/trash/script/when/we/have/js/off" title="Delete this image" class="ui-icon ui-icon-trash">Delete image</a>

  </li>

</ul>

 

<div id="trash" class="ui-widget-content ui-state-default">

  <h4 class="ui-widget-header"><span class="ui-icon ui-icon-trash">Trash</span> Trash</h4>

效果图如下：

演示地址：http://jqueryui.com/droppable/#photo-manager。

如果拖拽后不让其消失，复制一份新的到拖拽的地方，需要加入

  var target = $item.append(recycle_icon).clone();//clone复制一份新的
                target.appendTo($list).end().fadeIn(function () {
                    target
                      .animate({ width: "48px" })
                      .find("img")
                        .animate({ height: "36px" });
                });