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最新评论
though there is a visible property that you can test if a element is having the visibility set to true (display = none), however, it is more arguable why not just to test the offsetWidth and the offsetHeight property, thought it looks crude, but it shold be incredibly effecient in that if a width and height is 0, then even if the display is not none, you will not be able to see it on the screen.
however, there is one exception for the height and width test, it is because that IE has tr return width or height as 0; so we have the following code.
<html> <head> <title>Visibility Test</title> <script type="text/javascript"> function isVisible(elem) { var isTR = elem.nodeName.toLowerCase() === "tr", w = elem.offsetWidth, h = elem.offsetHeight; return w !== 0 && h !== 0 && !isTR ? true : w === 0 && h === 0 && !isTR ? false : computedStyle(elem, "display") === "none"; } window.onload = function () { var block = document.getElementById("block"); var none = document.getElementById("none"); // Alerts out 'true' alert(isVisible(block)); // Alerts out 'false' alert(isVisible(none)); }; </script> </head> <body> <div id="block">Test</div> <div id="none" style="display:none;">Test</div> </body> </html>
发表评论
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javascript - trick to cross browser DOM ready event
2012-08-24 08:23 900the "ready" event ... -
javascript - trick to simulate mouseenter and mouseleave
2012-08-23 08:31 2228Previously we discussed javasc ... -
javascript - trick to simulate the change event
2012-08-22 08:51 1610In the previous discussion a ... -
javascript - trick to simulate bubbling submit event
2012-08-22 08:03 882In the previous discussion abou ... -
javascript - trick to implement bubbling submit event
2012-08-23 07:55 670Following up to the javascrip ... -
javascript - trick to detect bubbling supportability
2012-08-20 22:22 932Event delegation is oe of the b ... -
javascript - trigger event and custom events
2012-08-20 21:58 2044In the previous post - javascri ... -
javascript - trick to handlers management
2012-08-20 08:19 995We have discussed "javascr ... -
javascript - trick to centralized store
2012-08-20 07:52 784For a number of reasons it's ... -
javascript - trick to fix the event object
2012-08-20 07:47 849Many browsers, especially In ... -
javascript - tricks to deal with colors
2012-08-15 08:34 742There are a couple of ways to r ... -
javascript - trick to manipulate the opacity
2012-08-15 08:26 744All other browsre may have supp ... -
javascript - trick to get and set height and width
2012-08-15 08:05 519when looking at properties t ... -
javascript - trick to set/get attributes that expects px values
2012-08-16 11:00 494When setting a number into a ... -
javascript - trick to get and set CSS style
2012-08-16 11:00 718while it will not be so much tr ... -
javascript - trick to normalize href for IE
2012-08-16 10:59 507IE is again the only browser th ... -
javascript - trick IE form and its expando attribute
2012-08-16 10:59 1008there is a known issue that if ... -
javascript expando and attributes
2012-08-14 08:15 1010expando is something like this ... -
javascript - trick to getText and setText
2012-08-14 07:40 1105it is not as simple as you thin ... -
javascript - trick/guideline to remove DOM element
2012-08-14 07:00 1155remove an element is not as sim ...
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