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<title>Example: Drag Delegation with a Drop Target</title>
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<h1>Example: Drag Delegation with a Drop Target</h1>
<div class="yui3-g">
<div class="yui3-u-3-4">
<div id="main">
<div class="content"><div class="intro">
<p>This example shows how to create multiple draggable items efficiently, still allowing for Drop Targets.</p>
</div>
<div class="example">
<style>
#demo {
width: 200px;
}
#demo ul li {
border: 1px solid black;
background-color: #8DD5E7;
cursor: move;
margin: 3px;
list-style-type: none;
z-index: 2;
zoom: 1;
}
#play {
position: relative;
zoom: 1;
}
#drop {
border: 1px solid black;
background-color: #eee;
height: 50px;
width: 200px;
position: absolute;
bottom: 5px;
right: 5px;
zoom: 1;
}
#drop strong {
font-weight: bold;
}
#drop.yui3-dd-drop-over {
background-color: #ccc;
}
</style>
<div id="play">
<div id="demo">
<ul>
<li>Item #1</li>
<li>Item #2</li>
<li>Item #3</li>
<li>Item #4</li>
<li>Item #5</li>
<li>Item #6</li>
<li>Item #7</li>
<li>Item #8</li>
<li>Item #9</li>
<li>Item #10</li>
</ul>
</div>
<div id="drop">Drop on me</div>
</div>
<script>
YUI().use('dd-delegate', 'dd-drop-plugin', function(Y) {
var del = new Y.DD.Delegate({
container: '#demo',
nodes: 'li'
});
del.on('drag:end', function(e) {
del.get('currentNode').setStyles({
top: 0,
left: 0
});
});
var drop = Y.one('#drop').plug(Y.Plugin.Drop);
drop.drop.on('drop:hit', function(e) {
drop.set('innerHTML', 'You dropped: <strong>' + e.drag.get('node').get('innerHTML') + '</strong>');
});
});
</script>
</div>
<h3 id="setting-up-the-delegate-container-and-items">Setting up the Delegate container and items</h3>
<p>First we need to create an HTML Node to act as the delegate container and give it some nodes to make draggable.</p>
<pre class="code prettyprint"><div id="play">
<div id="demo">
<ul>
<li>Item #1</li>
<li>Item #2</li>
<li>Item #3</li>
<li>Item #4</li>
<li>Item #5</li>
<li>Item #6</li>
<li>Item #7</li>
<li>Item #8</li>
<li>Item #9</li>
<li>Item #10</li>
</ul>
</div>
<div id="drop">Drop on me</div>
</div></pre>
<p>Now we give them some CSS to make them visible.</p>
<pre class="code prettyprint">#demo {
width: 200px;
}
#demo ul li {
border: 1px solid black;
background-color: #8DD5E7;
cursor: move;
margin: 3px;
list-style-type: none;
z-index: 2;
zoom: 1;
}
#play {
position: relative;
zoom: 1;
}
#drop {
border: 1px solid black;
background-color: #eee;
height: 50px;
width: 200px;
position: absolute;
bottom: 5px;
right: 5px;
zoom: 1;
}
#drop strong {
font-weight: bold;
}
#drop.yui3-dd-drop-over {
background-color: #ccc;
}</pre>
<h3 id="setting-up-the-yui-instance">Setting up the YUI Instance</h3>
<p>Now we need to create our YUI instance and tell it to load the <code>dd-delegate</code> module.</p>
<pre class="code prettyprint">YUI().use('dd-delegate', 'dd-drop-plugin');</pre>
<h3 id="making-the-nodes-draggable">Making the Nodes draggable</h3>
<p>Now that we have a YUI instance with the <code>dd-delegate</code> module, we need to instantiate the <code>Delegate</code> instance on this container and nodes.</p>
<pre class="code prettyprint">YUI().use('dd-delegate', 'dd-drop-plugin', function(Y) {
var del = new Y.DD.Delegate({
container: '#demo',
nodes: 'li'
});
});</pre>
<h3 id="listening-to-some-events">Listening to some events</h3>
<p>The <code>Delegate</code> object is a bubble target for the <code>DD.Drag</code> instances. So you can listen on it for all drag related events.</p>
<pre class="code prettyprint">YUI().use('dd-delegate', 'dd-drop-plugin', function(Y) {
var del = new Y.DD.Delegate({
container: '#demo',
nodes: 'li'
});
del.on('drag:end', function(e) {
del.get('currentNode').setStyles({
top: 0,
left: 0
});
});
});</pre>
<h3 id="adding-a-drop-target">Adding a Drop Target</h3>
<p>Now we can add a normal Drop Target to the page.</p>
<pre class="code prettyprint">var drop = Y.one('#drop').plug(Y.Plugin.Drop);</pre>
<p>Once that is created, we can add a <code>drop:hit</code> listener and manipulate the drag instance as we normally would.</p>
<pre class="code prettyprint">var drop = Y.one('#drop').plug(Y.Plugin.Drop);
drop.drop.on('drop:hit', function(e) {
drop.set('innerHTML', 'You dropped: <strong>' + e.drag.get('node').get('innerHTML') + '</strong>');
});</pre>
<h3 id="full-javascript-source">Full Javascript Source</h3>
<pre class="code prettyprint">YUI().use('dd-delegate', 'dd-drop-plugin', function(Y) {
var del = new Y.DD.Delegate({
container: '#demo',
nodes: 'li'
});
del.on('drag:end', function(e) {
del.get('currentNode').setStyles({
top: 0,
left: 0
});
});
var drop = Y.one('#drop').plug(Y.Plugin.Drop);
drop.drop.on('drop:hit', function(e) {
drop.set('innerHTML', 'You dropped: <strong>' + e.drag.get('node').get('innerHTML') + '</strong>');
});
});</pre>
</div>
</div>
</div>
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<div class="sidebar">
<div id="toc" class="sidebox">
<div class="hd">
<h2 class="no-toc">Table of Contents</h2>
</div>
<div class="bd">
<ul class="toc">
<li>
<a href="#setting-up-the-delegate-container-and-items">Setting up the Delegate container and items</a>
</li>
<li>
<a href="#setting-up-the-yui-instance">Setting up the YUI Instance</a>
</li>
<li>
<a href="#making-the-nodes-draggable">Making the Nodes draggable</a>
</li>
<li>
<a href="#listening-to-some-events">Listening to some events</a>
</li>
<li>
<a href="#adding-a-drop-target">Adding a Drop Target</a>
</li>
<li>
<a href="#full-javascript-source">Full Javascript Source</a>
</li>
</ul>
</div>
</div>
<div class="sidebox">
<div class="hd">
<h2 class="no-toc">Examples</h2>
</div>
<div class="bd">
<ul class="examples">
<li data-description="A simple drag interaction that doesn't require a drop interaction.">
<a href="simple-drag.html">Simple Drag</a>
</li>
<li data-description="How to apply the Drag Plugin to a node.">
<a href="drag-plugin.html">Drag - Node plugin</a>
</li>
<li data-description="A simple proxy drag interaction that doesn't require a drop interaction.">
<a href="proxy-drag.html">Drag - Proxy</a>
</li>
<li data-description="How to constrain a draggable Node to another Node's region.">
<a href="constrained-drag.html">Drag - Constrained to a Region</a>
</li>
<li data-description="Using interaction groups, this example demonstrates how to tie into the Drag & Drop Utility's interesting moments to provide visual affordances for the current drag operation.">
<a href="groups-drag.html">Drag - Interaction Groups</a>
</li>
<li data-description="The use of the drag shim when dragging nodes over other troublesome nodes.">
<a href="shim-drag.html">Using the Drag Shim</a>
</li>
<li data-description="How to use the Drop Target events to code your application.">
<a href="drop-code.html">Using Drop Based Coding</a>
</li>
<li data-description="How you can use the DD Scroll plugin to scroll the browser window as you drag.">
<a href="winscroll.html">Window Scrolling</a>
</li>
<li data-description="How to use DD.Delegate to create a scalable solution which supports multiple draggable items.">
<a href="delegate.html">Drag Delegation</a>
</li>
<li data-description="Using DD.Delegate to support dragging multiple items and dropping them onto a Drop Target.">
<a href="delegate-drop.html">Drag Delegation with a Drop Target</a>
</li>
<li data-description="How to use Drag plugins with a DD Delegate based solution.">
<a href="delegate-plugins.html">Using Drag Plugins with Delegate</a>
</li>
<li data-description="This example shows how to make a sortable list using Custom Event Bubbling.">
<a href="list-drag.html">List Reorder w/Bubbling</a>
</li>
<li data-description="This example shows how to make a sortable list using Custom Event Bubbling and Node Scrolling.">
<a href="scroll-list.html">List Reorder w/Scrolling</a>
</li>
<li data-description="How to make an animated node a Drop target.">
<a href="anim-drop.html">Animated Drop Targets</a>
</li>
<li data-description="Example Photo Browser application.">
<a href="photo-browser.html">Photo Browser</a>
</li>
<li data-description="Portal style example using Drag & Drop Event Bubbling and Animation.">
<a href="portal-drag.html">Portal Style Example</a>
</li>
</ul>
</div>
</div>
<div class="sidebox">
<div class="hd">
<h2 class="no-toc">Examples That Use This Component</h2>
</div>
<div class="bd">
<ul class="examples">
<li data-description="Working with multiple YUI instances.">
<a href="../yui/yui-multi.html">Multiple Instances</a>
</li>
<li data-description="Use StyleSheet to adjust the CSS rules applying a page theme from user input">
<a href="../stylesheet/stylesheet-theme.html">Adjusting a Page Theme on the Fly</a>
</li>
</ul>
</div>
</div>
</div>
</div>
</div>
</div>
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<script>prettyPrint();</script>
<script>
YUI.Env.Tests = {
examples: [],
project: '../assets',
assets: '../assets/dd',
name: 'delegate-drop',
title: 'Drag Delegation with a Drop Target',
newWindow: '',
auto: false
};
YUI.Env.Tests.examples.push('simple-drag');
YUI.Env.Tests.examples.push('drag-plugin');
YUI.Env.Tests.examples.push('proxy-drag');
YUI.Env.Tests.examples.push('constrained-drag');
YUI.Env.Tests.examples.push('groups-drag');
YUI.Env.Tests.examples.push('shim-drag');
YUI.Env.Tests.examples.push('drop-code');
YUI.Env.Tests.examples.push('winscroll');
YUI.Env.Tests.examples.push('delegate');
YUI.Env.Tests.examples.push('delegate-drop');
YUI.Env.Tests.examples.push('delegate-plugins');
YUI.Env.Tests.examples.push('list-drag');
YUI.Env.Tests.examples.push('scroll-list');
YUI.Env.Tests.examples.push('anim-drop');
YUI.Env.Tests.examples.push('photo-browser');
YUI.Env.Tests.examples.push('portal-drag');
YUI.Env.Tests.examples.push('yui-multi');
YUI.Env.Tests.examples.push('stylesheet-theme');
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