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PODeterminating location of span element for absolute positioning of floating div
 

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  1. PODeterminating location of span element for absolute positioning of floating div
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    <p>I need to create a "popup" div over a span element.</p> <p>I try to determinate its position and size to give correct boundary to place floating div.</p> <pre><code> &lt;html&gt; &lt;body&gt; &lt;p&gt;text a&lt;/p&gt; &lt;div style="padding-left:200px;padding-top:500px"&gt; &lt;table class="message"&gt; &lt;tr&gt;&lt;td&gt;test &lt;span id="test"&gt;hello&lt;/span&gt; world&lt;/td&gt;&lt;/tr&gt; &lt;/table&gt; &lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>I try to get this information for an element <code>id=test</code></p> <p>I tried two methods:</p> <p>First I get span</p> <pre><code>var span = document.getElementById('test'); </code></pre> <p>Than I calculate either using approach proposed at <a href="https://stackoverflow.com/questions/442404/dynamically-retrieve-the-position-x-y-of-an-html-element">Retrieve the position (X,Y) of an HTML element</a></p> <pre><code>var x0 = 0; var y0 = 0; var el = span; while(el &amp;&amp; !isNaN(el.offsetLeft) &amp;&amp; !isNaN(el.offsetTop)) { x0 += el.offsetLeft - el.scrollLeft; y0 += el.offsetTop - el.scrollTop; el = el.offsetParent; } var x1 = x0 + span.offsetWidth; var y1 = y0 + span.offsetHeight; </code></pre> <p>And I also try it by using:</p> <pre><code>var rect = span.getBoundingClientRect(); x0 = rect.left; x1 = rect.right; y0 = rect.top; y1 = rect.bottom; </code></pre> <p>Than I log:</p> <pre><code> console.log(JSON.stringify([x0,x1,y0,y1])); </code></pre> <p>In both cases I get:</p> <pre><code>[236,264,381,401] </code></pre> <p>Which can't be correct as the margin above the table of 500 pixels.</p> <p>How can I solve this problem correctly?</p> <p>i.e. how can I put a <code>div</code> with <code>position:ablosute</code> over this element at correct location?</p> <p><strong>Note:</strong> I can't use JQuery or other fat toolkits, I rather need a portable solution in plane JavaScript.</p> <p><strong>Edit:</strong> I noted that it does not work if the page requires scolling, i.e. the head part of page is hidden, how can it be compensated?</p>
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    1. COYou might want to mention what browser(s) you tested in. I took your code as-is and ran it in Firefox 18, Chrome 24 and even IE10 and got the expected results: [237,269,548,567]. In all but Chrome, the second method returned floating point coordinates instead of integers, but they were within half a pixel of each other. Actually, I just realized, the methods you are using don't include the scroll position, so try adding that in as well.
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      1. USMark Ormston
 

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