betajs-browser/src/ajax/jsonp_script_ajax.js

BetaJS-Browser is a client-side JavaScript framework for Browser-specific methods.

Scoped.define("module:Ajax.JsonpScriptAjax", [
    "base:Ajax.Support",
    "base:Net.Uri",
    "base:Net.HttpHeader",
    "base:Promise",
    "base:Types",
    "base:Ajax.RequestException",
    "base:Tokens",
    "base:Objs",
    "base:Async",
    "module:Info"
], function(AjaxSupport, Uri, HttpHeader, Promise, Types, RequestException, Tokens, Objs, Async, Info) {

    var id = 1;

    var Module = {

        supports: function(options) {
            if (!options.jsonp)
                return false;
            if (options.method !== "GET")
                return false;
            return true;
        },

        execute: function(options) {
            var callbackName = "jsonp_" + Tokens.generate_token() + "_" + (id++);
            var params = Objs.objectBy(options.jsonp, callbackName);
            params = Objs.extend(params, options.query);
            params = Objs.extend(params, options.data);
            var uri = Uri.appendUriParams(options.uri, params);
            var hasResult = false;

            window[callbackName] = function(data) {
                if (hasResult)
                    return;
                hasResult = true;
                try {
                    delete window[callbackName];
                } catch (e) {
                    window[callbackName] = undefined;
                }
                AjaxSupport.promiseReturnData(promise, options, data, "json"); //options.decodeType);
            };

            var promise = Promise.create();

            var head = document.getElementsByTagName("head")[0];
            var script = document.createElement("script");
            var executed = false;
            script.onerror = function(event) {
                if (event) {
                    if (event.stopPropagation)
                        event.stopPropagation();
                    else
                        event.cancelBubble = true;
                }
                if (hasResult)
                    return;
                hasResult = true;
                AjaxSupport.promiseRequestException(promise, HttpHeader.HTTP_STATUS_BAD_REQUEST, HttpHeader.format(HttpHeader.HTTP_STATUS_BAD_REQUEST), null, "json"); //options.decodeType);)
            };
            script.onload = script.onreadystatechange = function() {
                if (!executed && (!this.readyState || this.readyState == "loaded" || this.readyState == "complete")) {
                    executed = true;
                    script.onload = script.onreadystatechange = null;
                    head.removeChild(script);
                    if (Info.isInternetExplorer() && Info.internetExplorerVersion() < 9) {
                        Async.eventually(function() {
                            if (!hasResult)
                                script.onerror();
                        });
                    }
                }
            };

            uri = AjaxSupport.finalizeUri(options, uri);
            script.src = uri;
            head.appendChild(script);

            return promise;
        }

    };

    AjaxSupport.register(Module, 5);

    return Module;
});