How to call external webservice using jquery “jsonp”?

Question

I had a previous question can jquery ajax call external webservice?

and some good developers answered me to use jsonp, but i don\'t know how to use it, i am tr

Answer 1

The point with JSONP is the P! P as in padding. You are padding the JSON object literal with a function call - invoking a function on the calling page taking the data object as an argument.

I.e. if you request the webservice, send the desired callback function name in the query string

...service/?callback=hello

Then the service should answer (using appropriate mime type):

hello({a: 17, b: 4117});

For a more in-depth explanation, see: http://www.stpe.se/2008/10/cross-site-data-retrieval-using-jsonp/