Can I make a jQuery JSONP request without adding the '?callback=' parameter in URL?

Question

The server won't accept any parameters in a request URL, so I need to remove all the extra parameters in the URL and of course I can't control the server.

jQuery:

$.ajax({
    type: 'GET',
    url: 'http://cross-domain.com/the_jsonp_file,
    jsonpCallback: 'jsonCallback',
    contentType: 'application/json',
    cache: 'true',
    dataType: 'jsonp',
    success: function(json) {
        console.log(json);
    },
});

The JSONP file:

jsonCallback({"test": "hello"});

When I send that Ajax request, the URL looks like this:

http://cross-domain.com/the_jsonp_file?callback=jsonCallback

But I need this (without parameters):

http://cross-domain.com/the_jsonp_file

EDIT:

Here is my whole situation:

function MyClass(imgs) {
    // imgs is array of URLs
    this.imgs = imgs;

    this.submit = function() {
        // button click event triggers this method
        this._show();
    };

    this._show = function() {
        var _this = this;

        for (var i = 0; i < _this.imgs.length; i++) {
            (function($, j) {
                $.ajax({
                    type: 'GET',
                    url: _this.imgs[j],
                    jsonp : false,
                    jsonpCallback: 'jsonCallback',
                    cache: 'true',
                    dataType:'jsonp',
                    success: function(json) {
                      console.log(_this.imgs[j]);
                    },
                });
            })(jQuery, i);
        };
    };
};

And I got this error message:

Uncaught TypeError: Property 'jsonCallback' of object [object Window] is not a function

Weird thing is few requests are successfully calling jsonCallback.

Answer 1

Check the jQuery docs - they say to say jsonp: false and jsonpCallback : 'callbackFunction' in the ajax args....like:

$.ajax({
    url: 'http://cross-domain.com/the_jsonp_file',
    jsonp : false,
    jsonpCallback: 'jsonCallback',
    // contentType: 'application/json', -- you can't set content type for a <script> tag, this option does nothing for jsonp | KevinB
    cache: 'true',
    dataType : 'jsonp'
});

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