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POtrying to understand different $(this) in jquery
 

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    <pre><code>&lt;!doctype html&gt; &lt;html&gt; &lt;head&gt; &lt;meta charset="utf-8" /&gt; &lt;title&gt;Demo&lt;/title&gt; &lt;style type="text/css"&gt; #gallery { width: 960px; margin: 0 auto; } .galleryitem { width: 300px; height: 300px; float: left; font-family: Lucida Sans Unicode, Arial; font-style: italic; font-size: 13px; border: 5px solid black; margin: 3px; } .galleryitem img { width: 300px; } .galleryitem p { text-indent: 15px; } #galleryhoverp { margin-top: -55px; background-color: black; opacity: 0.5; -moz-opacity: 0.5; filter: alpha(opacity=50); height: 40px; color: white; padding-top: 10px; } #singleimagedisplay { width: 800px; } #singleimagedisplay img { width: 800px; } #singleimagedisplay a { float: right; color: white; } &lt;/style&gt; &lt;/head&gt; &lt;body&gt; &lt;div id="gallery"&gt; &lt;div class="galleryitem"&gt; &lt;img src="computer1.png" alt="A beautiful Sunset over a field" /&gt;&lt;p&gt; A beautiful Sunset over a field&lt;/p&gt; &lt;/div&gt; &lt;div class="galleryitem"&gt; &lt;img src="computer2.png" alt="Some penguins on the beach" /&gt;&lt;p&gt; Some penguins on the beach&lt;/p&gt; &lt;/div&gt; &lt;div class="galleryitem"&gt; &lt;img src="computer3.png" alt="The sun trying to break through the clouds" /&gt;&lt;p&gt; The sun trying to break through the clouds&lt;/p&gt; &lt;/div&gt; &lt;div class="galleryitem"&gt; &lt;img src="computer.png" alt="Palm tress on a sunny day" /&gt;&lt;p&gt; Palm tress on a sunny day&lt;/p&gt; &lt;/div&gt; &lt;div class="galleryitem"&gt; &lt;img src="computer4.png" alt="The sun bursting through the tall grass" /&gt;&lt;p&gt; The sun bursting through the tall grass&lt;/p&gt; &lt;/div&gt; &lt;/div&gt; &lt;/body&gt; &lt;/html&gt; &lt;script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"&gt;&lt;/script&gt; &lt;script&gt; $('p').hide(); var galleryItems = $('.galleryitem'); galleryItems.css('height', '200px'); var images = $('.galleryitem').find('img'); galleryItems.hover( function () { $(this).children('p').show().attr('id', 'galleryhoverp'); }, function () { $(this).children('p').hide().attr('id', ''); } ) images.click(function () { $(this).parent().attr('id', 'singleimagedisplay').css('height', $(this).height()).siblings().hide(); }) &lt;/script&gt; </code></pre> <p>Above code is from here: <a href="http://www.1stwebdesigner.com/tutorials/jquery-beginners-4/" rel="nofollow">http://www.1stwebdesigner.com/tutorials/jquery-beginners-4/</a></p> <p>Question:</p> <p>For this line: <code>$(this).parent().attr('id', 'singleimagedisplay').css('height', $(this).height()).siblings().hide();</code></p> <p>1.I know the first <code>$(this)</code> means the img that clicked, but what does sencond <code>$(this)</code> mean? </p> <p>2.when I clicked one img on the frontend, I can see see the img get enlarged, and it shows <code>style="height: 533px;</code> in firebug, but how come it is 533px? in css script, there is no such definition as <code>height: 533px</code>.</p>
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    1. COThe second `$(this)` should be the same element...
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    2. COIt is the same element, you are still in the same context...
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