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    <p>I put a <a href="http://plugins.jquery.com/project/autocenter" rel="noreferrer">jquery plugin</a> here</p> <p>VERY SHORT VERSION</p> <pre><code>$('#myDiv').css({top:'50%',left:'50%',margin:'-'+($('#myDiv').height() / 2)+'px 0 0 -'+($('#myDiv').width() / 2)+'px'}); </code></pre> <p>SHORT VERSION</p> <pre><code>(function($){ $.fn.extend({ center: function () { return this.each(function() { var top = ($(window).height() - $(this).outerHeight()) / 2; var left = ($(window).width() - $(this).outerWidth()) / 2; $(this).css({position:'absolute', margin:0, top: (top &gt; 0 ? top : 0)+'px', left: (left &gt; 0 ? left : 0)+'px'}); }); } }); })(jQuery); </code></pre> <p>Activated by this code :</p> <pre><code>$('#mainDiv').center(); </code></pre> <p>PLUGIN VERSION</p> <pre><code>(function($){ $.fn.extend({ center: function (options) { var options = $.extend({ // Default values inside:window, // element, center into window transition: 0, // millisecond, transition time minX:0, // pixel, minimum left element value minY:0, // pixel, minimum top element value withScrolling:true, // booleen, take care of the scrollbar (scrollTop) vertical:true, // booleen, center vertical horizontal:true // booleen, center horizontal }, options); return this.each(function() { var props = {position:'absolute'}; if (options.vertical) { var top = ($(options.inside).height() - $(this).outerHeight()) / 2; if (options.withScrolling) top += $(options.inside).scrollTop() || 0; top = (top &gt; options.minY ? top : options.minY); $.extend(props, {top: top+'px'}); } if (options.horizontal) { var left = ($(options.inside).width() - $(this).outerWidth()) / 2; if (options.withScrolling) left += $(options.inside).scrollLeft() || 0; left = (left &gt; options.minX ? left : options.minX); $.extend(props, {left: left+'px'}); } if (options.transition &gt; 0) $(this).animate(props, options.transition); else $(this).css(props); return $(this); }); } }); })(jQuery); </code></pre> <p>Activated by this code :</p> <pre><code>$(document).ready(function(){ $('#mainDiv').center(); $(window).bind('resize', function() { $('#mainDiv').center({transition:300}); }); ); </code></pre> <p>is that right ?</p> <h1>UPDATE :</h1> <p>From <a href="http://css-tricks.com/centering-percentage-widthheight-elements/" rel="noreferrer">CSS-Tricks</a></p> <pre><code>.center { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); /* Yep! */ width: 48%; height: 59%; } </code></pre>
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    1. POUsing jQuery to center a DIV on the screen
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    1. USmolokoloco
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    1. COYour function worked perfectly fine for a vertical center. It does not appear to work for a horizontal center.
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      1. USHalsafar
    2. COIMHO the CSS trick is beginning to be the prefered way.
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      1. USPierre de LESPINAY
 

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