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    <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false"> <div class="snippet-code"> <pre class="snippet-code-js lang-js prettyprint-override"><code>$("#right").click(function(){ $(".block").animate({"left": "+=50px"}, "fast", checkCollisions); }); $("#left").click(function(){ $(".block").animate({"left": "-=50px"}, "fast", checkCollisions); }); $("#up").click(function(){ $(".block").animate({"top": "-=50px"}, "fast", checkCollisions); }); $("#down").click(function(){ $(".block").animate({"top": "+=50px"}, "fast", checkCollisions); }); function getPositions(box) { var $box = $(box); var pos = $box.position(); var width = $box.width(); var height = $box.height(); return [ [ pos.left, pos.left + width ], [ pos.top, pos.top + height ] ]; } function comparePositions(p1, p2) { var x1 = p1[0] &lt; p2[0] ? p1 : p2; var x2 = p1[0] &lt; p2[0] ? p2 : p1; return x1[1] &gt; x2[0] || x1[0] === x2[0] ? true : false; } function checkCollisions(){ var box = $(".bomb")[0]; var pos = getPositions(box); var pos2 = getPositions(this); var horizontalMatch = comparePositions(pos[0], pos2[0]); var verticalMatch = comparePositions(pos[1], pos2[1]); var match = horizontalMatch &amp;&amp; verticalMatch; if (match) { $("body").append("&lt;p&gt;COLLISION !!!&lt;/p&gt;"); } }</code></pre> <pre class="snippet-code-css lang-css prettyprint-override"><code>.block { position:absolute; background-color:#abc; left:50px; width:90px; height:90px; margin:5px; } .bomb { position:absolute; background-color:red; left:250px; width:40px; height:40px; margin:5px; }</code></pre> <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"&gt;&lt;/script&gt; &lt;button id="left"&gt;left&lt;/button&gt; &lt;button id="right"&gt;right&lt;/button&gt; &lt;button id="up"&gt;up&lt;/button&gt; &lt;button id="down"&gt;down&lt;/button&gt; &lt;div class="block"&gt;&lt;/div&gt; &lt;div class="bomb"&gt;&lt;/div&gt;</code></pre> </div> </div> </p> <p>You can use <a href="http://sourceforge.net/projects/jquerycollision/" rel="nofollow noreferrer">JQuery Collision</a> and <a href="http://sourceforge.net/projects/jquidragcollide/" rel="nofollow noreferrer">JQuery UI Draggable Collision</a>.</p> <p>JQuery Collision extension returns the collisions between two selectors. Handles padding, margin, borders, and can determine either overlap or portion outside.</p> <p>With <strong>JQuery Collision</strong> you can find all overlaps:</p> <pre><code>var list = $("#selector").collision(".obstacle"); </code></pre> <p><em>Returns a list of all elements that overlap "#selector".</em></p> <p>With <strong>JQuery UI Draggable</strong>, you can bind an event when you drag an element and a collision happens and you can prevent the collision:</p> <pre><code>$("#selector").draggable( { obstacle: ".obstacle", preventCollision: true } ); </code></pre> <p>Some plugins for collision detection:<br/> <a href="http://archive.plugins.jquery.com/project/collidable" rel="nofollow noreferrer"><strong>Collidable Draggables</strong></a>,<br/> <a href="http://www.48design.de/news/2009/11/20/kollisionsabfrage-per-jquery-plugin-update-v11-8/" rel="nofollow noreferrer"><strong>Collision Check Plugin</strong> v1.1</a>,<br/> <a href="http://blog.threedubmedia.com/2008/08/eventspecialdrop.html" rel="nofollow noreferrer"><strong>$.event.special.drop</strong></a></p> <p>Also :</p> <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false"> <div class="snippet-code"> <pre class="snippet-code-js lang-js prettyprint-override"><code>var overlaps = (function () { function getPositions( elem ) { var pos, width, height; pos = $( elem ).position(); width = $( elem ).width(); height = $( elem ).height(); return [ [ pos.left, pos.left + width ], [ pos.top, pos.top + height ] ]; } function comparePositions( p1, p2 ) { var r1, r2; r1 = p1[0] &lt; p2[0] ? p1 : p2; r2 = p1[0] &lt; p2[0] ? p2 : p1; return r1[1] &gt; r2[0] || r1[0] === r2[0]; } return function ( a, b ) { var pos1 = getPositions( a ), pos2 = getPositions( b ); return comparePositions( pos1[0], pos2[0] ) &amp;&amp; comparePositions( pos1[1], pos2[1] ); }; })(); $(function () { var area = $( '#area' )[0], box = $( '#box0' )[0], html; html = $( area ).children().not( box ).map( function ( i ) { return '&lt;p&gt;Red box + Box ' + ( i + 1 ) + ' = ' + overlaps( box, this ) + '&lt;/p&gt;'; }).get().join( '' ); $( 'body' ).append( html ); });</code></pre> <pre class="snippet-code-css lang-css prettyprint-override"><code>body { padding: 30px; color: #444; font-family: Arial, sans-serif; } h1 { font-size: 24px; margin-bottom: 20px; } #area { border: 2px solid gray; width: 500px; height: 400px; position: relative; } #area &gt; div { background-color: rgba(122, 122, 122, 0.3); position: absolute; text-align: center; font-size: 50px; width: 60px; height: 60px; } #box0 { background-color: rgba(255, 0, 0, 0.5) !important; top: 150px; left: 150px; } #box1 { top: 260px; left: 50px; } #box2 { top: 110px; left: 160px; } #box3 { top: 200px; left: 200px; } #box4 { top: 50px; left: 400px; } p { margin: 5px 0; }</code></pre> <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"&gt;&lt;/script&gt; &lt;h1&gt;Detect overlapping&lt;/h1&gt; &lt;div id="area"&gt; &lt;div id="box0"&gt;&lt;/div&gt; &lt;div id="box1"&gt;1&lt;/div&gt; &lt;div id="box2"&gt;2&lt;/div&gt; &lt;div id="box3"&gt;3&lt;/div&gt; &lt;div id="box4"&gt;4&lt;/div&gt; &lt;/div&gt;</code></pre> </div> </div> </p>
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    1. COhey, thanks for the reply. I did try that before, but it doesn't detect collision...
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    2. CO@Christopher, Which one did you check?
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    3. COall of em, I'm testing every single one, have a look at my code
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