JSFiddle - React, Tailwind, and code Playground

by jfriend00

HTML

<script src="http://files.the-friend-family.com/log.js"></script>

JavaScript

(function() {
    // create XMLHttpRequest proxy object
    var oldXMLHttpRequest = XMLHttpRequest;

    // define constructor for my proxy object
    XMLHttpRequest = function() {
        var actual = new oldXMLHttpRequest();
        var self = this;

        this.onreadystatechange = null;

        // this is the actual handler on the real XMLHttpRequest object
        actual.onreadystatechange = function() {
            if (this.responseText) {
                log("actual ajax response (readyState = " + this.readyState + "): " + this.responseText);
                self.responseText = '{"msg": "Hello"}';
            }
            if (this.readyState == 4) {
                // actual.responseText is the ajax result

                // add your own code here to read the real ajax result
                // from actual.responseText and then put whatever result you want
                // the caller to see in self.responseText
                // this next line of code is a dummy line to be replaced
                self.responseText = '{"msg": "Hello"}';
            }
            if (self.onreadystatechange) {
                return self.onreadystatechange();
            }
        };

        // add all proxy getters
        ["status", "statusText", "responseType", "response",
         "readyState", "responseXML", "upload"].forEach(function(item) {
            Object.defineProperty(self, item, {
                get: function() {return actual[item];}
            });
        });

        // add all proxy getters/setters
        ["ontimeout, timeout", "withCredentials", "onload", "onerror", "onprogress"].forEach(function(item) {
            Object.defineProperty(self, item, {
                get: function() {return actual[item];},
                set: function(val) {actual[item] = val;}
            });
        });

        // add all pure proxy pass-through methods
        ["addEventListener", "send", "open", "abort", "getAllResponseHeaders",
        ...