How Can I Successfully Make Cross-Domain AJAX JSONP Requests with jQuery?

Making Cross-Domain AJAX JSONP Requests with jQuery

When attempting to parse JSON array data using jQuery ajax cross-domain, it's essential to note that the remote server hosting the data must support method injection for JSONP to function properly.

In your code, the following block initiates an AJAX request using dataType: 'jsonp':

$.ajax({
    type: "GET",
    url: "http://10.211.2.219:8080/SampleWebService/sample.do",
    dataType: "jsonp",
    success: function (xml) {
        alert(xml.data[0].city);
        result = xml.code;
        document.myform.result1.value = result;
    },
});

When jQuery executes this request, it appends ?callback={some_random_dynamically_generated_method} to the URL. This method, typically attached to the window object, acts as a proxy and looks something like this:

window.some_random_dynamically_generated_method = function(actualJsonpData) {
    // Calls the success callback
    successCallback(actualJsonData);
}

While your client-side code appears correct, it's imperative to modify your server-side code to wrap your JSON data with the function name passed via the query string. For instance, if the request URL includes ?callback=my_callback_method, the server should respond with JSON data wrapped in the following structure:

my_callback_method({your json serialized data});

This ensures that the JSON data is successfully parsed and made available to your client-side code.

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