AJAX - The Complete Reference

220 Part II: Applied Ajax^

function logRequest(request)

{

$("log").innerHTML += "<strong>Request:</strong>" + request.url + " sent.<br />";

}

NNOT EOTE You can call Ajax.Responders.unregister(responder) to disassociate a responder

with a particular event, but you will need to have saved a reference to the object when you

initially bound events (var responder = Ajax.Responders.register(); ) since you

need to pass that value to this method.

Exploring Prototype Further

Like YUI, Prototype 1.5 covers the basics and adds some nice conveniences, but it really could

go a lot further. Ajax communication capabilities are only part of what all the fuss about

Prototype is about. The library provides numerous features that can make JavaScript far easier.

Take a look at a few of Prototype’s interesting selection and utility functions in Table 5-9.

You’ll see there are numerous very convenient calls that can significantly reduce your

JavaScript efforts.

Table 5-10 shows even more facilities that you might find valuable in your Ajax coding

efforts, particularly when dealing with query strings and JSON responses. However, if you

Function Description Example

$ A shortcut for document

.getElementById() and

more. You can pass this

function a single string or

element and it will return either

the element or the document

.getElementById() on the

string. You can also pass it a

list of strings or elements and

it will return an array of the

elements.

var node = $('myDiv');

TABLE 5-9 Sample of Useful Prototype Facilities