MooTools Essentials: The Official MooTools Reference for by Aaron Newton

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Info Compatibility With each release of MooTools, there is a corresponding compatibility script that will alias function and variable names to their counterparts in the newer version. This adds more code to your environment, but not much, and if you have a lot of code written for an earlier version, this can help you transition to the newer release. Note When using MooTools, you should always reference only the variables and methods outlined in the documentation. Though classes have more methods and properties than are defined in the documentation, these are considered private, and the compatibility scripts that accompany each release maintain only the public methods and properties.

Js extends elements to make attaching events and managing the Event object easier. js What it does: Defines methods used to alter the style properties of elements. js. js scripts. js directly. It’s only useful if you wish to write your own effect extension. js What it does: Defines the animation logic for transitioning style properties. Elements, but, like Fx, it’s unlikely that you’ll use it directly unless you extend it to write your own effect. Morph effect. , height and width). js What it does: Defines numerous transitions that can be used by any effect.

Value; }; test(); //No value passed, so it is undefined, //and test() returns false As these examples demonstrate, $defined is a shortcut to determine whether a value has been set at all. js What it does: $chk checks to see whether a value is defined or is zero. Usage: $chk(value) Example: var ninja = { wealth: 0, getPaid: function(howMuch){ if ($chk(howMuch)) wealth += howMuch; } }; When you’ll use it: Much like $defined, $chk helps you manage type coercion. $chk will still return false for null, undefined, false, and empty strings, but it won’t return false for zero.