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POHow to swap 2 items using Draggable and Droppable?
 

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  1. POHow to swap 2 items using Draggable and Droppable?
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    <h2>Problem</h2> <p>I have 4 images. User can drag and drop them to another list and change the order of the images. Target is that the users selects the order of the images. The problem is that I am unable to swap these images when they are place on each other.</p> <h2>HTML</h2> <pre><code>&lt;ul id="choices"&gt; &lt;li&gt;&lt;img src="http://placehold.it/200x200&amp;text=1" /&gt;&lt;/li&gt; &lt;li&gt;&lt;img src="http://placehold.it/200x200&amp;text=2" /&gt;&lt;/li&gt; &lt;li&gt;&lt;img src="http://placehold.it/200x200&amp;text=3" /&gt;&lt;/li&gt; &lt;li&gt;&lt;img src="http://placehold.it/200x200&amp;text=4" /&gt;&lt;/li&gt; &lt;/ul&gt; &lt;ul id="answers"&gt; &lt;li&gt;&lt;/li&gt; &lt;li&gt;&lt;/li&gt; &lt;li&gt;&lt;/li&gt; &lt;li&gt;&lt;/li&gt; &lt;/ul&gt; </code></pre> <h2>jQuery</h2> <pre><code>(function ($) { $("#choices li img").draggable({ revert: true, zIndex: 10, snap: "#answers li", snapMode: "inner", snapTolerance: 40 }); $("#answers li").droppable({ drop: function (event, ui) { var dropped = ui.draggable; var droppedOn = this; if ($(droppedOn).children().length &gt; 0) { alert("I need to swap these"); } $(dropped).detach().css({ top: 0, left: 0 }).prependTo($(droppedOn)); } }); })(jQuery); </code></pre> <h2>CSS (not realy important)</h2> <pre><code>img { display: block; z-index: 3; } #choices, #answers { display:block; padding: 0; margin: 0; } #choices li, #answers li { display: inline-block; height: 200px; width: 200px; margin: 10px; background: #515151; } #answers li { position: relative; } </code></pre> <h2>Example</h2> <p><a href="http://jsfiddle.net/K6QNg/" rel="nofollow">http://jsfiddle.net/K6QNg/</a></p>
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    1. COBefore I continue reviewing this, I just wanted you to know that 'choises' has a 'c' lol oh and you're traversing the DOM with Sizzle way more than necessary. `$("#choises li img")` should be `var $img = $('#choices').find('img');`
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    2. CO@Deryck Thanks for that :)
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    3. CO@Deryck Could even be faster, this is just an example :) [jsPerf](http://jsperf.com/jquery-find-vs-sizzle/3)
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