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    <p>This is tagged through jQuery so I'm going to use jQuery; even though it's not mentioned in the question body.</p> <p>a) It sounds like you want to get the height of the viewport (window); which can be retrieved like this:</p> <pre><code>var height = $(window).height(); </code></pre> <p>If the height of the document (page) exceeds the height of the window, and there are no CSS properties blocking the display of scrollbars, then scrollbars will indeed by visible.</p> <pre><code>if( $(document).height() &gt; $(window).height() ) </code></pre> <p>b) This is going to be a bit trickier, in the sense the only way off the top of my head is to query every DOM element.. <strong>this is not a elegant solution</strong>; and <em>in fact I'd ask you to reconsider your approach if you really you must do this</em>. That said.. for curiosity...</p> <p>If you're looking for the max height, in the sense of the largest element - then this would work:</p> <pre><code>// Get height of largest element. var max_height = 0; $('*').each( function(){ // skip &lt;html&gt; and &lt;body&gt; if( ( $(this).get(0) == $('body').get(0) ) || ( $(this).get(0) == $('html').get(0) ) ) return; var current_height = $(this).height(); if( current_height &gt; max_height ) max_height = current_height; }); </code></pre> <p>For example, running that on this page...</p> <pre><code>&gt; console.log( max_height ); 570 </code></pre> <p>However, I'm not sure if you want the maximum height of all combined elements.. In which case we obviously need to add all the elements up, but there's the obvious problem: elements are nested!</p> <p>If this is what you want, then by using <code>.children()</code> we can just iterate through the lengths of the elements that are immediate children of your containing element/body.</p> <pre><code>// Get height of all combined elements var combined_height = 0; $('body').each( function(){ // replace with containing element? combined_height = combined_height + jQuery(this).height(); }); </code></pre> <p>For example, running that on this page:</p> <pre><code>&gt; console.log(combined_height); 2176 </code></pre>
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    1. POGet height at which scroll bars will appear in javascript
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    1. COSo actually, the answer to both questions should be the same. $(window).height() does not give me at what page height scroll bars will appear - it instead gives the height of the viewing window.
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    2. COIn the context of displaying a web page, should the height of the page be larger than than the height of the viewport scrollbars will appear unless otherwise set by hiding the overflow using CSS. So in regards to question 1; I stick by the answer.
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    3. COYou're certainly correct, but i'm looking for that "height of the page" rather than "height of the viewport". $(window).height() is the "height of the viewport".
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