Over a million developers have joined DZone.
{{announcement.body}}
{{announcement.title}}

Using MooTools For Opacity

DZone's Guide to

Using MooTools For Opacity

· Web Dev Zone ·
Free Resource

Learn how error monitoring with Sentry closes the gap between the product team and your customers. With Sentry, you can focus on what you do best: building and scaling software that makes your users’ lives better.

Update: The semantic-lovers have won!  I'm now using the title attribute.

Although it's possible to achieve opacity using CSS, the hacks involved aren't pretty. If you're using the MooTools javascript library, opacity is as easy as using an element's "set" method. The following MooTools snippet takes every image with the "opacity" class and sets the element's opacity based upon the number in the image's "alt" tag (correct, semantics have been thrown out the window). MooTools 1.2 is required.

The MooTools Javascript

/* on dom ready ... */
window.addEvent('domready', function() {
/* for each image that requires opacity */
$$('.opacity').each(function(el) {
/* set the opacity based on the alt value */
el.set('opacity','.' + el.getProperty('title'));
});
});

The XHTML

<img src="rod.jpg" title="80" class="opacity" />
<img src="rod.jpg" title="60" class="opacity" />
<img src="rod.jpg" title="40" class="opacity" />
<img src="rod.jpg" title="20" class="opacity" /><br />

The Result

Click here to view an example. For those concerned with semantics, you can just as easily use the "title" attribute in the image.

What’s the best way to boost the efficiency of your product team and ship with confidence? Check out this ebook to learn how Sentry's real-time error monitoring helps developers stay in their workflow to fix bugs before the user even knows there’s a problem.

Topics:

Published at DZone with permission of

Opinions expressed by DZone contributors are their own.

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}