JQuery: 'Uncaught TypeError: Illegal invocation' at ajax request - several elements

Question

I have two select elements, A and B: when A\'s selected option changes, B\'s options must be updated accordingly. Each element in A implies many elements in B, it\'s a one-t

Answer 1

From the jQuery docs for processData:

processData Boolean
^{Default: true}
By default, data passed in to the data option as an object (technically, anything other than a string) will be processed and transformed into a query string, fitting to the default content-type "application/x-www-form-urlencoded". If you want to send a DOMDocument, or other non-processed data, set this option to false.

Source: http://api.jquery.com/jquery.ajax

Looks like you are going to have to use processData to send your data to the server, or modify your php script to support querystring encoded parameters.