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CHAPTER 8

That's a lot of options to keep track of, but it's unlikely that more than a few of
them will be used for any one request. Even so, wouldn't it be convenient if we
could set default values for these options for pages where we're planning to make
a large number of requests?

8.4.2 Setting request defaults

Obviously the last question in the previous section was a setup. As you might have
suspected, jQuery provides a way for us to set up a default set of Ajax properties
that will be used when we don't override their values. This can make pages that
initiate lots of similar Ajax calls much simpler.

The function to set up the list of Ajax defaults is

$.ajaxSetup()

, and its syntax

is as follows:

At any point in script processing, usually at page load (but can be at any point of
the page authors' choosing), this function can be used to set up defaults to be
used for all subsequent calls to

$.ajax()

.

NOTE

Defaults set with this function aren't applied to the

load()

command. For

utility functions such as

$.get()

and

$.post()

, the

HTTP

method can't

be overridden by use of these defaults. Setting a default

type

of

GET

won't

cause

$.post()

to use the

GET

HTTP

method.

Let's say that we are setting up a page where, for the majority of Ajax requests
(made with the utility function rather than the

load()

command), we want to set

up some defaults so that we don't need to specify them on every call. We can, as
the first statement in the header

<script>

element, write

$.ajaxSetup({

type: 'POST',

timeout: 5000,

Command syntax: $.ajaxSetup

Establishes the passed set of properties as the defaults for subsequent calls to $.ajax().

Parameters

properties

(Object) An object instance whose properties define the set of default Ajax
properties. These are the same properties described for the $.ajax()
function in table 8.2.

Returns
Undefined.