Java Reference
In-Depth Information
The
handleResponse()
function also saw a few changes. Thanks to MooTools' built‐in support for
JSON, the function has been simplified:
function handleResponse(data, json) {
if (data.available) {
alert(data.searchTerm + " is available!");
} else {
alert("We're sorry, but " + data.searchTerm + " is not available.");
}
}
The data passed to the first parameter,
data
, is already parsed into a JavaScript object. So you
simply use it to check if the username or e‐mail is available and display the correct information to
the user.
Finally, you wire up the events:
$("usernameAvailability").addEvent("click", checkUsername);
$("emailAvailability").addEvent("click", checkEmail);
You find the
<a/>
elements in the document and register their
click
event listeners with MooTools'
addEvent()
method.
MooTools is a popular framework because it offers you utility similar to jQuery while maintaining
aspects of traditional DOM programming. MooTools also has an animation/effects component,
making it a well‐rounded framework. This section can hardly do the framework justice, so make
summarY
This chapter introduced you into the rather large world of JavaScript frameworks and libraries.
➤
You learned that two types of libraries and frameworks exist: general and specific. You
were also given a short list of the popular solutions available today.
➤
You learned where to obtain the files needed to use Modernizr, Prototype, and
MooTools.
➤
You learned how Modernizr helps you write feature‐specific code, and how to load external
resources, like polyfills, for browsers that don't support certain features.
➤
You learned the basics of the Prototype framework—how to retrieve, create, and
manipulate elements. You also learned how to register event listeners and send Ajax
requests.
➤
You learned how to use MooTools to create, select, and modify elements, as well as wire up
event listeners and make Ajax requests.
