放置（Droppable） - 简单的照片管理器
您可以通过拖拽照片到回收站或者点击回收站图标来删除照片。
您可以通过拖拽照片到相册或者点击回收利用图标来还原照片。
您可以通过点击缩放图标来查看大图。jQuery UI 对话框（dialog）部件用于模态窗口。
源代码
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery UI 放置（Droppable） - 简单的照片管理器</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>
<link rel="stylesheet" href="http://jqueryui.com/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() {
// 这是相册和回收站
var $gallery = $( "#gallery" ),
$trash = $( "#trash" );
// 让相册的条目可拖拽
$( "li", $gallery ).draggable({
cancel: "a.ui-icon", // 点击一个图标不会启动拖拽
revert: "invalid", // 当未被放置时，条目会还原回它的初始位置
containment: "document",
helper: "clone",
cursor: "move"
});
// 让回收站可放置，接受相册的条目
$trash.droppable({
accept: "#gallery > li",
activeClass: "ui-state-highlight",
drop: function( event, ui ) {
deleteImage( ui.draggable );
}
});
// 让相册可放置，接受回收站的条目
$gallery.droppable({
accept: "#trash li",
activeClass: "custom-state-active",
drop: function( event, ui ) {
recycleImage( ui.draggable );
}
});
// 图像删除功能
var recycle_icon = "<a href='link/to/recycle/script/when/we/have/js/off' title='还原图像' class='ui-icon ui-icon-refresh'>还原图像</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" });
});
});
}
// 图像还原功能
var trash_icon = "<a href='link/to/trash/script/when/we/have/js/off' title='删除图像' class='ui-icon ui-icon-trash'>删除图像</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();
});
}
// 图像预览功能，演示 ui.dialog 作为模态窗口使用
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 );
}
}
// 通过事件代理解决图标行为
$( "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="/wp-content/uploads/2014/03/high_tatras_min.jpg" alt="High Tatras 的最高峰" width="96" height="72">
<a href="/wp-content/uploads/2014/03/high_tatras.jpg" title="查看大图" class="ui-icon ui-icon-zoomin">查看大图</a>
<a href="link/to/trash/script/when/we/have/js/off" title="删除图像" class="ui-icon ui-icon-trash">删除图像</a>
</li>
<li class="ui-widget-content ui-corner-tr">
<h5 class="ui-widget-header">High Tatras 2</h5>
<img src="/wp-content/uploads/2014/03/high_tatras2_min.jpg" alt="绿山湖畔的小屋" width="96" height="72">
<a href="/wp-content/uploads/2014/03/high_tatras2.jpg" title="查看大图" class="ui-icon ui-icon-zoomin">查看大图</a>
<a href="link/to/trash/script/when/we/have/js/off" title="删除图像" class="ui-icon ui-icon-trash">删除图像</a>
</li>
<li class="ui-widget-content ui-corner-tr">
<h5 class="ui-widget-header">High Tatras 3</h5>
<img src="/wp-content/uploads/2014/03/high_tatras3_min.jpg" alt="计划登高" width="96" height="72">
<a href="/wp-content/uploads/2014/03/high_tatras3.jpg" title="查看大图" class="ui-icon ui-icon-zoomin">查看大图</a>
<a href="link/to/trash/script/when/we/have/js/off" title="删除图像" class="ui-icon ui-icon-trash">删除图像</a>
</li>
<li class="ui-widget-content ui-corner-tr">
<h5 class="ui-widget-header">High Tatras 4</h5>
<img src="/wp-content/uploads/2014/03/high_tatras4_min.jpg" alt="在 Kozi kopka 的顶部" width="96" height="72">
<a href="/wp-content/uploads/2014/03/high_tatras4.jpg" title="查看大图" class="ui-icon ui-icon-zoomin">查看大图</a>
<a href="link/to/trash/script/when/we/have/js/off" title="删除图像" class="ui-icon ui-icon-trash">删除图像</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">回收站</span> 回收站</h4>
</div>
</div>
</body>
</html>