Javascript CrossDomain Workaround

gistfile1.js

/*
* Just a simple javascript cross domain workaround. 
* The typical <script> hack with a little bit of sugar
* Needs a unique value to identify the callback
* in the callback stack when the script completes.
* The uniqueId is not generated outside because it needs to be passed
* as a parameter in the API call
* The callback stack is stored in window.crossDomainCallbacks
*/
 function crossDomainScript(url, uniqueId, callback) {
        var script = (document.createElement("SCRIPT"));
        script.id = uniqueId;
        script.src = url;
        document.getElementsByTagName("head")[0].appendChild(script);
        if (!window.crossDomainCallbacks) {
            window.crossDomainCallbacks = [];
        }
        window.crossDomainCallbacks[uniqueId] = function (res) {
            callback(res);
            script.parentElement.removeChild(script);
        };
    }
//example usage, needs working API url though
function crossDomainExample(){
  var uniqueId = Math.random().toString(36).slice(2); 
  crossDomainScript("http://somewebsite/api/doSomething?callback=window.crossDomainCallbacks['" + uniqueId +  "']",
    uniqueId, function(){
      alert("Callback successful!")
    })
}