放置（Droppable）
为可拖拽小部件创建目标。
如需了解更多有关 droppable 交互的细节，请查看 API 文档 可放置小部件（Droppable Widget）。
默认功能
在任意的 DOM 元素上启用 droppable 功能，并为可拖拽小部件创建目标。
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery UI 放置（Droppable） - 默认功能</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>
#draggable { width: 100px; height: 100px; padding: 0.5em; float: left; margin: 10px 10px 10px 0; }
#droppable { width: 150px; height: 150px; padding: 0.5em; float: left; margin: 10px; }
</style>
<script>
$(function() {
$( "#draggable" ).draggable();
$( "#droppable" ).droppable({
drop: function( event, ui ) {
$( this )
.addClass( "ui-state-highlight" )
.find( "p" )
.html( "Dropped!" );
}
});
});
</script>
</head>
<body>
<div id="draggable" class="ui-widget-content">
<p>请把我拖拽到目标处！</p>
</div>
<div id="droppable" class="ui-widget-header">
<p>请放置在这里！</p>
</div>
</body>
</html>
接受
使用 accept 选项指定目标 droppable 接受哪一个元素（或元素组）。
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery UI 放置（Droppable） - 接受</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>
#droppable { width: 150px; height: 150px; padding: 0.5em; float: left; margin: 10px; }
#draggable, #draggable-nonvalid { width: 100px; height: 100px; padding: 0.5em; float: left; margin: 10px 10px 10px 0; }
</style>
<script>
$(function() {
$( "#draggable, #draggable-nonvalid" ).draggable();
$( "#droppable" ).droppable({
accept: "#draggable",
activeClass: "ui-state-hover",
hoverClass: "ui-state-active",
drop: function( event, ui ) {
$( this )
.addClass( "ui-state-highlight" )
.find( "p" )
.html( "Dropped!" );
}
});
});
</script>
</head>
<body>
<div id="draggable-nonvalid" class="ui-widget-content">
<p>我是不能被放置的 draggable</p>
</div>
<div id="draggable" class="ui-widget-content">
<p>请拖拽我到目标</p>
</div>
<div id="droppable" class="ui-widget-header">
<p>accept: '#draggable'</p>
</div>
</body>
</html>
防止传播
当使用嵌套的 droppable 时 — 例如，您可以有一个树形的可编辑的目录结构，带有文件夹和文档节点 — greedy 选项设置为 true 来防止当 draggable 被放置在子节点（droppable）上时的事件传播。
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery UI 放置（Droppable） - 防止传播</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>
#draggable { width: 100px; height: 40px; padding: 0.5em; float: left; margin: 10px 10px 10px 0; }
#droppable, #droppable2 { width: 230px; height: 120px; padding: 0.5em; float: left; margin: 10px; }
#droppable-inner, #droppable2-inner { width: 170px; height: 60px; padding: 0.5em; float: left; margin: 10px; }
</style>
<script>
$(function() {
$( "#draggable" ).draggable();
$( "#droppable, #droppable-inner" ).droppable({
activeClass: "ui-state-hover",
hoverClass: "ui-state-active",
drop: function( event, ui ) {
$( this )
.addClass( "ui-state-highlight" )
.find( "> p" )
.html( "Dropped!" );
return false;
}
});
$( "#droppable2, #droppable2-inner" ).droppable({
greedy: true,
activeClass: "ui-state-hover",
hoverClass: "ui-state-active",
drop: function( event, ui ) {
$( this )
.addClass( "ui-state-highlight" )
.find( "> p" )
.html( "Dropped!" );
}
});
});
</script>
</head>
<body>
<div id="draggable" class="ui-widget-content">
<p>请拖拽我到目标</p>
</div>
<div id="droppable" class="ui-widget-header">
<p>外部 droppable</p>
<div id="droppable-inner" class="ui-widget-header">
<p>内部 droppable（不带有 greedy）</p>
</div>
</div>
<div id="droppable2" class="ui-widget-header">
<p>外部 droppable</p>
<div id="droppable2-inner" class="ui-widget-header">
<p>内部 droppable（带有 greedy）</p>
</div>
</div>
</body>
</html>
还原 draggable 的位置
当带有布尔值 revert 选项的 draggable 停止拖拽时，返回 draggable（或它的助手）到原始位置。
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery UI 放置（Droppable） - 还原 draggable 的位置</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>
#draggable, #draggable2 { width: 100px; height: 100px; padding: 0.5em; float: left; margin: 10px 10px 10px 0; }
#droppable { width: 150px; height: 150px; padding: 0.5em; float: left; margin: 10px; }
</style>
<script>
$(function() {
$( "#draggable" ).draggable({ revert: "valid" });
$( "#draggable2" ).draggable({ revert: "invalid" });
$( "#droppable" ).droppable({
activeClass: "ui-state-default",
hoverClass: "ui-state-hover",
drop: function( event, ui ) {
$( this )
.addClass( "ui-state-highlight" )
.find( "p" )
.html( "已放置！" );
}
});
});
</script>
</head>
<body>
<div id="draggable" class="ui-widget-content">
<p>当被放置在目标上时还原</p>
</div>
<div id="draggable2" class="ui-widget-content">
<p>当未被放置在目标上时还原</p>
</div>
<div id="droppable" class="ui-widget-header">
<p>请放置在这里</p>
</div>
</body>
</html>
购物车演示
演示如何使用折叠面板来展示产品的目录结构，使用拖拽和放置来添加产品到购物车，购物车中的产品是可排序的。
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery UI 放置（Droppable） - 购物车演示</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>
h1 { padding: .2em; margin: 0; }
#products { float:left; width: 500px; margin-right: 2em; }
#cart { width: 200px; float: left; margin-top: 1em; }
/* 定义列表样式，以便最大化 droppable */
#cart ol { margin: 0; padding: 1em 0 1em 3em; }
</style>
<script>
$(function() {
$( "#catalog" ).accordion();
$( "#catalog li" ).draggable({
appendTo: "body",
helper: "clone"
});
$( "#cart ol" ).droppable({
activeClass: "ui-state-default",
hoverClass: "ui-state-hover",
accept: ":not(.ui-sortable-helper)",
drop: function( event, ui ) {
$( this ).find( ".placeholder" ).remove();
$( "<li></li>" ).text( ui.draggable.text() ).appendTo( this );
}
}).sortable({
items: "li:not(.placeholder)",
sort: function() {
// 获取由 droppable 与 sortable 交互而加入的条目
// 使用 connectWithSortable 可以解决这个问题，但不允许您自定义 active/hoverClass 选项
$( this ).removeClass( "ui-state-default" );
}
});
});
</script>
</head>
<body>
<div id="products">
<h1 class="ui-widget-header">产品</h1>
<div id="catalog">
<h2><a href="#">T-Shirts</a></h2>
<div>
<ul>
<li>Lolcat Shirt</li>
<li>Cheezeburger Shirt</li>
<li>Buckit Shirt</li>
</ul>
</div>
<h2><a href="#">Bags</a></h2>
<div>
<ul>
<li>Zebra Striped</li>
<li>Black Leather</li>
<li>Alligator Leather</li>
</ul>
</div>
<h2><a href="#">Gadgets</a></h2>
<div>
<ul>
<li>iPhone</li>
<li>iPod</li>
<li>iPad</li>
</ul>
</div>
</div>
</div>
<div id="cart">
<h1 class="ui-widget-header">购物车</h1>
<div class="ui-widget-content">
<ol>
<li class="placeholder">添加产品到这里</li>
</ol>
</div>
</div>
</body>
</html>
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。
<!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>
视觉反馈
当悬停在 droppable 上时，或者当 droppable 被激活（即一个可接受的 draggable 被放置在 droppable 上）时，改变 droppable 的外观。使用 hoverClass 或 activeClass 选项来分别指定 class。
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery UI 放置（Droppable） - 视觉反馈</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>
#draggable, #draggable2 { width: 90px; height: 90px; padding: 0.5em; float: left; margin: 10px 10px 10px 0; }
#droppable, #droppable2 { width: 120px; height: 120px; padding: 0.5em; float: left; margin: 10px; }
h3 { clear: left; }
</style>
<script>
$(function() {
$( "#draggable" ).draggable();
$( "#droppable" ).droppable({
hoverClass: "ui-state-hover",
drop: function( event, ui ) {
$( this )
.addClass( "ui-state-highlight" )
.find( "p" )
.html( "Dropped!" );
}
});
$( "#draggable2" ).draggable();
$( "#droppable2" ).droppable({
accept: "#draggable2",
activeClass: "ui-state-default",
drop: function( event, ui ) {
$( this )
.addClass( "ui-state-highlight" )
.find( "p" )
.html( "Dropped!" );
}
});
});
</script>
</head>
<body>
<h3>当悬停在 droppable 上时的反馈：</h3>
<div id="draggable" class="ui-widget-content">
<p>请拖拽我到目标</p>
</div>
<div id="droppable" class="ui-widget-header">
<p>请放置在这里</p>
</div>
<h3>当激活 draggable 时的反馈：</h3>
<div id="draggable2" class="ui-widget-content">
<p>请拖拽我到目标</p>
</div>
<div id="droppable2" class="ui-widget-header">
<p>请放置在这里</p>
</div>
</body>
</html>