Guide on loading xml information from a web browser using JavaScript

I have been working on loading data from the browser using a URL and currently utilizing JavaScript to achieve this.

window.onload = function()
        {
            // This is the specific URL I am attempting to load data from. 
            // The XML file with myURL is located on localhost.
            var url = "myURL&callback=processDATA"; 
            loadDATA(url);
        }

function loadDATA(url)
        {

            var headId = document.getElementsByTagName('head')[0];
            var newScript = document.createElement('script');
            newScript.type = 'text/javascript';
            newScript.src = url;
            headId.appendChild(newScript);
        }

function processDATA(feed) // This function should be called after loadDATA(url).
        {
             // My goal is to have my XML file stored in the feed variable. 
             // However, for some reason, this function is not being executed following loadDATA.
        }

I am at a loss and unsure of how to proceed. Any assistance would be greatly appreciated.

Answer №1

The concept behind this function is that the server API is knowledgeable about including your function within your designated "callback" parameter for JSONP. Are you in the process of developing the server API that will be delivering XML as well? If yes, you must ensure that it can detect the presence of a callback querystring parameter, which would then be used to provide the data. In C#, the code snippet would typically appear like this:

if (request.QueryString["callback"] != null)
    response.write(request.QueryString["callback"] + "('" + xmldata + "');

This operation is triggered upon return.

If this serves as a public API, investigate whether they have assigned a specific callback parameter name for jsonp. A common choice is 'jsoncallback'.

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