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>