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POHow to accurately resize nested elements with ems and font-size percentage?
 

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  1. POHow to accurately resize nested elements with ems and font-size percentage?
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    <p>I have a carousel with textboxes for each image, and my client (who knows nothing about HTML) edits the textboxes using a WYSIWYG text editor. The resulting output is akin to your worst nightmares; something like:</p> <pre><code>&lt;div class="carousel-text-container"&gt; &lt;span style="font-size:18pt;"&gt; &lt;span style="font-weight:bold;"&gt; Lorem &lt;span style="font-size:15pt:"&gt;Dolor&lt;/span&gt; &lt;/span&gt; Ipsum &lt;span style="font-size:19pt;"&gt; &lt;span&gt;&amp;nbsp;&lt;/span&gt; &lt;span&gt;Sit&lt;span&gt;Amet&lt;/span&gt;&lt;/span&gt; &lt;/span&gt; &lt;/span&gt; &lt;/div&gt; </code></pre> <p>This site has to be displayed at 3 different sizes to accomodate smaller monitors, so I have been using CSS media queries to resize the site. </p> <p>Now I am having trouble resizing the text inside the textbox correctly. I have tried using <code>jQuery.fn.css</code> to get the font size of each element in <code>px</code>, and then convert it to <code>em</code>. Then, by setting a <code>font-size:x%</code> sort of declaration on <code>.carousel-text-container</code>, I hoped that that would resize everything properly. </p> <p>Unfortunately, there seems to be a recursive nature with how font-size is applied in ems. That is, <code>.example</code> is not resized properly in the following because its parent is also influencing it</p> <pre><code>&lt;span style="font-size:2em;"&gt; Something &lt;span class="example" style="font-size:1.5em;"&gt;Else&lt;/span&gt; &lt;/span&gt; </code></pre> <p>How can I resize everything reliably and precisely such I can achieve a true percentage of my original font size, margin, padding, line-height, etc. for all the children of <code>.carousel-text-container</code>? </p> <p>Right now, I'm at the point of imagining up some sort of recursive JavaScript function:</p> <pre><code>var carouselTextBoxEl; function resizeCarouselTextBox () { // some example numbers thrown in var newWidthRatio = .8, function resizeCarouselTextBoxEl (el, nestedLevelNum) { nestedLevelNum = nestedLevelNum || 1; var childElFontSizePxStr = parseFloat(el.css('font-size')), // 16.2984392, for example // calculate new font size based on // width ratio of original size site to new size, // and do something with nestedLevelNum... what's the math with that? newChildElFontSizePxStr = childElFontSizePxStr * newWidthRatio, // get children of el, if any elChildrenEls = el.children(), i = elChildrenEls.length; el.css('font-size', newChildElFontSizePxStr + 'em'); while (--i &gt;= 0) { resizeCarouselTextBoxEl(elChildrenEls[i], nestedLevelNum + 1); } } carouselTextBoxEl.children().each(function () { resizeCarouselTextBoxEl($(this) }); } onSmallerScreen(resizeCarouselTextBox); </code></pre> <p>UPDATE: I am letting the client take advantage of resizing certain words to use as headings and such, so I cannot simply just set everything to a single font size.</p> <p>Just a thought: would it be possible to place inside an HTML5 canvas and take a snapshot and/or resize that way? </p>
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