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Using MooTools For Opacity

DZone's Guide to

Using MooTools For Opacity

· Web Dev Zone ·
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Jumpstart your Angular applications with Indigo.Design, a unified platform for visual design, UX prototyping, code generation, and app development.

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.

Take a look at an Indigo.Design sample application to learn more about how apps are created with design to code software.

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