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dani.jque..

$.ajax() + async: false + jsonp

in Developing jQuery Core • 13 years ago

I'm trying to call a url with async: false but I always receive an
exception.
This problem happen with both release 1.2.6 and 1.3.2.
Here is the snippet:
var html = $.ajax({
url: 'http://ajax.googleapis.com/ajax/services/
search/web?q=testquery&start=0&v=1.0&rsz=large',
dataType: "jsonp",
async: false,
success: function(data, textStatus) { }
}).responseText;
responseText always throw a null or not an object exception.
any help?

Replies(2)

dave.meth..

Re: $.ajax() + async: false + jsonp

13 years ago

> I'm trying to call a url with async: false but I always
> receive an exception.
> ...
> responseText always throw a null or not an object exception.
A JSONP request is not done with an XMLHttpRequest object, otherwise
it couldn't be done cross-domain. You can't do it async and you can't
use a .responseText property because there isn't one. The docs link to
a site that explains the concept behind JSONP:
http://bob.pythonmac.org/archives/2005/12/05/remote-json-jsonp/
The docs could use more clarification on this; JSONP is close enough
in spirit that it can fit in the $.ajax call, but a lot of the options
there don't apply to JSONP. I made a few changes a while back but more
could be done; suggestions welcome!
http://docs.jquery.com/Ajax/jQuery.ajax#options
http://dev.jquery.com/ticket/4110

dave.meth..

Re: $.ajax() + async: false + jsonp

13 years ago

Correction: you can't do JSONP as async:false (synchronous).

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