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AJAX for reuse with different data? (NO jQuery) [duplicate]

How can I make an AJAX call using JavaScript, without using jQuery?

With "vanilla" (plain) JavaScript:
function loadXMLDoc() {
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == XMLHttpRequest.DONE) { // XMLHttpRequest.DONE == 4
if (xmlhttp.status == 200) {
document.getElementById("myDiv").innerHTML = xmlhttp.responseText;
}
else if (xmlhttp.status == 400) {
alert('There was an error 400');
}
else {
alert('something else other than 200 was returned');
}
}
};
xmlhttp.open("GET", "ajax_info.txt", true);
xmlhttp.send();
}
With jQuery:
$.ajax({
url: "test.html",
context: document.body,
success: function() {
$(this).addClass("done");
}
});

Using the following snippet you can do similar things pretty easily, like this:
ajax.get('/test.php', {foo: 'bar'}, function() {});
Here is the snippet:
var ajax = {};
ajax.x = function () {
if (typeof XMLHttpRequest !== 'undefined') {
return new XMLHttpRequest();
}
var versions = [
"MSXML2.XmlHttp.6.0",
"MSXML2.XmlHttp.5.0",
"MSXML2.XmlHttp.4.0",
"MSXML2.XmlHttp.3.0",
"MSXML2.XmlHttp.2.0",
"Microsoft.XmlHttp"
];
var xhr;
for (var i = 0; i < versions.length; i++) {
try {
xhr = new ActiveXObject(versions[i]);
break;
} catch (e) {
}
}
return xhr;
};
ajax.send = function (url, callback, method, data, async) {
if (async === undefined) {
async = true;
}
var x = ajax.x();
x.open(method, url, async);
x.onreadystatechange = function () {
if (x.readyState == 4) {
callback(x.responseText)
}
};
if (method == 'POST') {
x.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
}
x.send(data)
};
ajax.get = function (url, data, callback, async) {
var query = [];
for (var key in data) {
query.push(encodeURIComponent(key) + '=' + encodeURIComponent(data[key]));
}
ajax.send(url + (query.length ? '?' + query.join('&') : ''), callback, 'GET', null, async)
};
ajax.post = function (url, data, callback, async) {
var query = [];
for (var key in data) {
query.push(encodeURIComponent(key) + '=' + encodeURIComponent(data[key]));
}
ajax.send(url, callback, 'POST', query.join('&'), async)
};

There is now a nicer Fetch API available natively in modern browsers. The fetch() method allows you to make web requests.
For example, to request some JSON from /get-data:
let options = {
method: 'GET',
headers: {}
};
fetch('/get-data', options)
.then(response => response.json())
.then(body => {
// Do something with body
});
See MDN Web Docs: Using the Fetch API for more details.

You can use the following function:
function callAjax(url, callback){
var xmlhttp;
// compatible with IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function(){
if (xmlhttp.readyState == 4 && xmlhttp.status == 200){
callback(xmlhttp.responseText);
}
}
xmlhttp.open("GET", url, true);
xmlhttp.send();
}
You can try similar solutions online on these links:
https://www.w3schools.com/xml/tryit.asp?filename=tryajax_first
https://www.w3schools.com/xml/tryit.asp?filename=tryajax_callback

xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
alert(this.responseText);
}
};
xhttp.open("GET", "ajax_info.txt", true);
xhttp.send();

How about this version in plain ES6/ES2015?
function get(url) {
return new Promise((resolve, reject) => {
const req = new XMLHttpRequest();
req.open('GET', url);
req.onload = () => req.status === 200 ? resolve(req.response) : reject(Error(req.statusText));
req.onerror = (e) => reject(Error(`Network Error: ${e}`));
req.send();
});
}
The function returns a promise. Here is an example on how to use the function and handle the promise it returns:
get('foo.txt')
.then((data) => {
// Do stuff with data, if foo.txt was successfully loaded.
})
.catch((err) => {
// Do stuff on error...
});
If you need to load a json file you can use JSON.parse() to convert the loaded data into an JS Object.
You can also integrate req.responseType='json' into the function but unfortunately there is no IE support for it, so I would stick with JSON.parse().

Use XMLHttpRequest.
Simple GET request
httpRequest = new XMLHttpRequest()
httpRequest.open('GET', 'http://www.example.org/some.file')
httpRequest.send()
Simple POST request
httpRequest = new XMLHttpRequest()
httpRequest.open('POST', 'http://www.example.org/some/endpoint')
httpRequest.send('some data')
We can specify that the request should be asynchronous(true), the default, or synchronous(false) with an optional third argument.
// Make a synchronous GET request
httpRequest.open('GET', 'http://www.example.org/some.file', false)
We can set headers before calling httpRequest.send()
httpRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
We can handle the response by setting httpRequest.onreadystatechange to a function before calling httpRequest.send()
httpRequest.onreadystatechange = function(){
// Process the server response here.
if (httpRequest.readyState === XMLHttpRequest.DONE) {
if (httpRequest.status === 200) {
alert(httpRequest.responseText);
} else {
alert('There was a problem with the request.');
}
}
}

You can get the correct object according to the browser with
function getXmlDoc() {
var xmlDoc;
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlDoc = new XMLHttpRequest();
}
else {
// code for IE6, IE5
xmlDoc = new ActiveXObject("Microsoft.XMLHTTP");
}
return xmlDoc;
}
With the correct object, a GET might can be abstracted to:
function myGet(url, callback) {
var xmlDoc = getXmlDoc();
xmlDoc.open('GET', url, true);
xmlDoc.onreadystatechange = function() {
if (xmlDoc.readyState === 4 && xmlDoc.status === 200) {
callback(xmlDoc);
}
}
xmlDoc.send();
}
And a POST to:
function myPost(url, data, callback) {
var xmlDoc = getXmlDoc();
xmlDoc.open('POST', url, true);
xmlDoc.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xmlDoc.onreadystatechange = function() {
if (xmlDoc.readyState === 4 && xmlDoc.status === 200) {
callback(xmlDoc);
}
}
xmlDoc.send(data);
}

I was looking for a way to include promises with ajax and exclude jQuery. There's an article on HTML5 Rocks that talks about ES6 promises. (You could polyfill with a promise library like Q) You can use the code snippet that I copied from the article.
function get(url) {
// Return a new promise.
return new Promise(function(resolve, reject) {
// Do the usual XHR stuff
var req = new XMLHttpRequest();
req.open('GET', url);
req.onload = function() {
// This is called even on 404 etc
// so check the status
if (req.status == 200) {
// Resolve the promise with the response text
resolve(req.response);
}
else {
// Otherwise reject with the status text
// which will hopefully be a meaningful error
reject(Error(req.statusText));
}
};
// Handle network errors
req.onerror = function() {
reject(Error("Network Error"));
};
// Make the request
req.send();
});
}
Note: I also wrote an article about this.

A small combination from a couple of the examples below and created this simple piece:
function ajax(url, method, data, async)
{
method = typeof method !== 'undefined' ? method : 'GET';
async = typeof async !== 'undefined' ? async : false;
if (window.XMLHttpRequest)
{
var xhReq = new XMLHttpRequest();
}
else
{
var xhReq = new ActiveXObject("Microsoft.XMLHTTP");
}
if (method == 'POST')
{
xhReq.open(method, url, async);
xhReq.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhReq.setRequestHeader("X-Requested-With", "XMLHttpRequest");
xhReq.send(data);
}
else
{
if(typeof data !== 'undefined' && data !== null)
{
url = url+'?'+data;
}
xhReq.open(method, url, async);
xhReq.setRequestHeader("X-Requested-With", "XMLHttpRequest");
xhReq.send(null);
}
//var serverResponse = xhReq.responseText;
//alert(serverResponse);
}
// Example usage below (using a string query):
ajax('http://www.google.com');
ajax('http://www.google.com', 'POST', 'q=test');
OR if your parameters are object(s) - minor additional code adjustment:
var parameters = {
q: 'test'
}
var query = [];
for (var key in parameters)
{
query.push(encodeURIComponent(key) + '=' + encodeURIComponent(parameters[key]));
}
ajax('http://www.google.com', 'POST', query.join('&'));
Both should be fully browser + version compatible.

If you don't want to include JQuery, I'd try out some lightweight AJAX libraries.
My favorite is reqwest. It's only 3.4kb and very well built out: https://github.com/ded/Reqwest
Here's a sample GET request with reqwest:
reqwest({
url: url,
method: 'GET',
type: 'json',
success: onSuccess
});
Now if you want something even more lightweight, I'd try microAjax at a mere 0.4kb: https://code.google.com/p/microajax/
This is all the code right here:
function microAjax(B,A){this.bindFunction=function(E,D){return function(){return E.apply(D,[D])}};this.stateChange=function(D){if(this.request.readyState==4){this.callbackFunction(this.request.responseText)}};this.getRequest=function(){if(window.ActiveXObject){return new ActiveXObject("Microsoft.XMLHTTP")}else{if(window.XMLHttpRequest){return new XMLHttpRequest()}}return false};this.postBody=(arguments[2]||"");this.callbackFunction=A;this.url=B;this.request=this.getRequest();if(this.request){var C=this.request;C.onreadystatechange=this.bindFunction(this.stateChange,this);if(this.postBody!==""){C.open("POST",B,true);C.setRequestHeader("X-Requested-With","XMLHttpRequest");C.setRequestHeader("Content-type","application/x-www-form-urlencoded");C.setRequestHeader("Connection","close")}else{C.open("GET",B,true)}C.send(this.postBody)}};
And here's a sample call:
microAjax(url, onSuccess);

XMLHttpRequest()
You can use the XMLHttpRequest() constructor to create a new XMLHttpRequest (XHR) object which will allow you to interact with a server using standard HTTP request methods (such as GET and POST):
const data = JSON.stringify({
example_1: 123,
example_2: 'Hello, world!',
});
const request = new XMLHttpRequest();
request.addEventListener('load', function () {
if (this.readyState === 4 && this.status === 200) {
console.log(this.responseText);
}
});
request.open('POST', 'example.php', true);
request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
request.send(data);
fetch()
You can also use the fetch() method to obtain a Promise which resolves to the Response object representing the response to your request:
const data = JSON.stringify({
example_1: 123,
example_2: 'Hello, world!',
});
fetch('example.php', {
method: 'POST',
headers: {
'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8',
},
body: data,
}).then(response => {
if (response.ok) {
response.text().then(response => {
console.log(response);
});
}
});
navigator.sendBeacon()
On the other hand, if you are simply attempting to POST data and do not need a response from the server, the shortest solution would be to use navigator.sendBeacon():
const data = JSON.stringify({
example_1: 123,
example_2: 'Hello, world!',
});
navigator.sendBeacon('example.php', data);

Try using the Fetch Api (Fetch API)
fetch('http://example.com/movies.json').then(response => response.json()).then(data => console.log(data));
Its really clear, and 100% vanilla.

Old but I will try, maybe someone will find this info useful.
This is the minimal amount of code you need to do a GET request and fetch some JSON formatted data. This is applicable only to modern browsers like latest versions of Chrome, FF, Safari, Opera and Microsoft Edge.
const xhr = new XMLHttpRequest();
xhr.open('GET', 'https://example.com/data.json'); // by default async
xhr.responseType = 'json'; // in which format you expect the response to be
xhr.onload = function() {
if(this.status == 200) {// onload called even on 404 etc so check the status
console.log(this.response); // No need for JSON.parse()
}
};
xhr.onerror = function() {
// error
};
xhr.send();
Also check out new Fetch API which is a promise-based replacement for XMLHttpRequest API.

From youMightNotNeedJquery.com + JSON.stringify
var request = new XMLHttpRequest();
request.open('POST', '/my/url', true);
request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
request.send(JSON.stringify(data));

This may help:
function doAjax(url, callback) {
var xmlhttp = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP");
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
callback(xmlhttp.responseText);
}
}
xmlhttp.open("GET", url, true);
xmlhttp.send();
}

<html>
<script>
var xmlDoc = null ;
function load() {
if (typeof window.ActiveXObject != 'undefined' ) {
xmlDoc = new ActiveXObject("Microsoft.XMLHTTP");
xmlDoc.onreadystatechange = process ;
}
else {
xmlDoc = new XMLHttpRequest();
xmlDoc.onload = process ;
}
xmlDoc.open( "GET", "background.html", true );
xmlDoc.send( null );
}
function process() {
if ( xmlDoc.readyState != 4 ) return ;
document.getElementById("output").value = xmlDoc.responseText ;
}
function empty() {
document.getElementById("output").value = '<empty>' ;
}
</script>
<body>
<textarea id="output" cols='70' rows='40'><empty></textarea>
<br></br>
<button onclick="load()">Load</button>
<button onclick="empty()">Clear</button>
</body>
</html>

Well it is just a 4 step easy proceess,
I hope it helps
Step 1. Store the reference to the XMLHttpRequest object
var xmlHttp = createXmlHttpRequestObject();
Step 2. Retrieve the XMLHttpRequest object
function createXmlHttpRequestObject() {
// will store the reference to the XMLHttpRequest object
var xmlHttp;
// if running Internet Explorer
if (window.ActiveXObject) {
try {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {
xmlHttp = false;
}
}
// if running Mozilla or other browsers
else {
try {
xmlHttp = new XMLHttpRequest();
} catch (e) {
xmlHttp = false;
}
}
// return the created object or display an error message
if (!xmlHttp)
alert("Error creating the XMLHttpRequest object.");
else
return xmlHttp;
}
Step 3. Make asynchronous HTTP request using the XMLHttpRequest object
function process() {
// proceed only if the xmlHttp object isn't busy
if (xmlHttp.readyState == 4 || xmlHttp.readyState == 0) {
// retrieve the name typed by the user on the form
item = encodeURIComponent(document.getElementById("input_item").value);
// execute the your_file.php page from the server
xmlHttp.open("GET", "your_file.php?item=" + item, true);
// define the method to handle server responses
xmlHttp.onreadystatechange = handleServerResponse;
// make the server request
xmlHttp.send(null);
}
}
Step 4. Executed automatically when a message is received from the server
function handleServerResponse() {
// move forward only if the transaction has completed
if (xmlHttp.readyState == 4) {
// status of 200 indicates the transaction completed successfully
if (xmlHttp.status == 200) {
// extract the XML retrieved from the server
xmlResponse = xmlHttp.responseText;
document.getElementById("put_response").innerHTML = xmlResponse;
// restart sequence
}
// a HTTP status different than 200 signals an error
else {
alert("There was a problem accessing the server: " + xmlHttp.statusText);
}
}
}

in plain JavaScript in the browser:
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function() {
if (xhr.readyState == XMLHttpRequest.DONE ) {
if(xhr.status == 200){
console.log(xhr.responseText);
} else if(xhr.status == 400) {
console.log('There was an error 400');
} else {
console.log('something else other than 200 was returned');
}
}
}
xhr.open("GET", "mock_data.json", true);
xhr.send();
Or if you want to use Browserify to bundle your modules up using node.js. You can use superagent:
var request = require('superagent');
var url = '/mock_data.json';
request
.get(url)
.end(function(err, res){
if (res.ok) {
console.log('yay got ' + JSON.stringify(res.body));
} else {
console.log('Oh no! error ' + res.text);
}
});

Here's a JSFiffle without JQuery
http://jsfiddle.net/rimian/jurwre07/
function loadXMLDoc() {
var xmlhttp = new XMLHttpRequest();
var url = 'http://echo.jsontest.com/key/value/one/two';
xmlhttp.onreadystatechange = function () {
if (xmlhttp.readyState == XMLHttpRequest.DONE) {
if (xmlhttp.status == 200) {
document.getElementById("myDiv").innerHTML = xmlhttp.responseText;
} else if (xmlhttp.status == 400) {
console.log('There was an error 400');
} else {
console.log('something else other than 200 was returned');
}
}
};
xmlhttp.open("GET", url, true);
xmlhttp.send();
};
loadXMLDoc();

var load_process = false;
function ajaxCall(param, response) {
if (load_process == true) {
return;
}
else
{
if (param.async == undefined) {
param.async = true;
}
if (param.async == false) {
load_process = true;
}
var xhr;
xhr = new XMLHttpRequest();
if (param.type != "GET") {
xhr.open(param.type, param.url, true);
if (param.processData != undefined && param.processData == false && param.contentType != undefined && param.contentType == false) {
}
else if (param.contentType != undefined || param.contentType == true) {
xhr.setRequestHeader('Content-Type', param.contentType);
}
else {
xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
}
}
else {
xhr.open(param.type, param.url + "?" + obj_param(param.data));
}
xhr.onprogress = function (loadTime) {
if (param.progress != undefined) {
param.progress({ loaded: loadTime.loaded }, "success");
}
}
xhr.ontimeout = function () {
this.abort();
param.success("timeout", "timeout");
load_process = false;
};
xhr.onerror = function () {
param.error(xhr.responseText, "error");
load_process = false;
};
xhr.onload = function () {
if (xhr.status === 200) {
if (param.dataType != undefined && param.dataType == "json") {
param.success(JSON.parse(xhr.responseText), "success");
}
else {
param.success(JSON.stringify(xhr.responseText), "success");
}
}
else if (xhr.status !== 200) {
param.error(xhr.responseText, "error");
}
load_process = false;
};
if (param.data != null || param.data != undefined) {
if (param.processData != undefined && param.processData == false && param.contentType != undefined && param.contentType == false) {
xhr.send(param.data);
}
else {
xhr.send(obj_param(param.data));
}
}
else {
xhr.send();
}
if (param.timeout != undefined) {
xhr.timeout = param.timeout;
}
else
{
xhr.timeout = 20000;
}
this.abort = function (response) {
if (XMLHttpRequest != null) {
xhr.abort();
load_process = false;
if (response != undefined) {
response({ status: "success" });
}
}
}
}
}
function obj_param(obj) {
var parts = [];
for (var key in obj) {
if (obj.hasOwnProperty(key)) {
parts.push(encodeURIComponent(key) + '=' + encodeURIComponent(obj[key]));
}
}
return parts.join('&');
}
my ajax call
var my_ajax_call=ajaxCall({
url: url,
type: method,
data: {data:value},
dataType: 'json',
async:false,//synchronous request. Default value is true
timeout:10000,//default timeout 20000
progress:function(loadTime,status)
{
console.log(loadTime);
},
success: function (result, status) {
console.log(result);
},
error :function(result,status)
{
console.log(result);
}
});
for abort previous requests
my_ajax_call.abort(function(result){
console.log(result);
});

HTML :
<!DOCTYPE html>
<html>
<head>
<script>
function loadXMLDoc()
{
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","1.php?id=99freebies.blogspot.com",true);
xmlhttp.send();
}
</script>
</head>
<body>
<div id="myDiv"><h2>Let AJAX change this text</h2></div>
<button type="button" onclick="loadXMLDoc()">Change Content</button>
</body>
</html>
PHP:
<?php
$id = $_GET[id];
print "$id";
?>

A verry good solution with pure javascript is here
/*create an XMLHttpRequest object*/
let GethttpRequest=function(){
let httpRequest=false;
if(window.XMLHttpRequest){
httpRequest =new XMLHttpRequest();
if(httpRequest.overrideMimeType){
httpRequest.overrideMimeType('text/xml');
}
}else if(window.ActiveXObject){
try{httpRequest =new ActiveXObject("Msxml2.XMLHTTP");
}catch(e){
try{
httpRequest =new ActiveXObject("Microsoft.XMLHTTP");
}catch(e){}
}
}
if(!httpRequest){return 0;}
return httpRequest;
}
/*Defining a function to make the request every time when it is needed*/
function MakeRequest(){
let uriPost ="myURL";
let xhrPost =GethttpRequest();
let fdPost =new FormData();
let date =new Date();
/*data to be sent on server*/
let data = {
"name" :"name",
"lName" :"lName",
"phone" :"phone",
"key" :"key",
"password" :"date"
};
let JSONdata =JSON.stringify(data);
fdPost.append("data",JSONdata);
xhrPost.open("POST" ,uriPost, true);
xhrPost.timeout = 9000;/*the time you need to quit the request if it is not completed*/
xhrPost.onloadstart = function (){
/*do something*/
};
xhrPost.onload = function (){
/*do something*/
};
xhrPost.onloadend = function (){
/*do something*/
}
xhrPost.onprogress =function(){
/*do something*/
}
xhrPost.onreadystatechange =function(){
if(xhrPost.readyState < 4){
}else if(xhrPost.readyState === 4){
if(xhrPost.status === 200){
/*request succesfull*/
}else if(xhrPost.status !==200){
/*request failled*/
}
}
}
xhrPost.ontimeout = function (e){
/*you can stop the request*/
}
xhrPost.onerror = function (){
/*you can try again the request*/
};
xhrPost.onabort = function (){
/*you can try again the request*/
};
xhrPost.overrideMimeType("text/plain; charset=x-user-defined-binary");
xhrPost.setRequestHeader("Content-disposition", "form-data");
xhrPost.setRequestHeader("X-Requested-With","xmlhttprequest");
xhrPost.send(fdPost);
}
/*PHP side
<?php
//check if the variable $_POST["data"] exists isset() && !empty()
$data =$_POST["data"];
$decodedData =json_decode($_POST["data"]);
//show a single item from the form
echo $decodedData->name;
?>
*/
/*Usage*/
MakeRequest();

Fast code fetch without jQuery
async function product_serach(word) {
var response = await fetch('<?php echo base_url(); ?>home/product_search?search='+word);
var json = await response.json();
for (let [key, value] of Object.entries(json))
{
console.log(json)
}
}

Return WebMethod Response & Use If Statement To Alert User Based On Response

I'm trying to include an if statement that analyzes the webmethod response which is either true or false. I just want to alert the user the post was successful if the response is true or the post was not successful if the response is false.
I can get the response using xhttp.responseText but I can't figure out how to build that into an if statement inside my javascript below:
//JavaScript that Posts to WebMethod
<script>
function createNewComment() {
var xhttp = new XMLHttpRequest();
var url = "http://localhost:57766/PALWebService.asmx/insertComment"
var a = document.getElementsByName("existingguid")[0].value;
var b = document.getElementsByName("newcomment")[0].value;
var c = 'existingguid=' + a + '&newcomment=' + b;
xhttp.open("POST", url, true);
xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhttp.onreadystatechange = function () {
if (this.readyState == 4 && this.status == 200) {
}
};
xhttp.send(c);
}
</script>

I figured it out. After checking that readyState was 4 and status was 200 I simply nested another if statement to check the responseText from the XMLHttpRequest and it was true I called another function and if it was false I notified user the post failed on the webmethod. It may not be perfect, but it works for what I need.
xhttp.onreadystatechange = function () {
if (this.readyState == 4 && this.status == 200) {
if (xhttp.responseText = true) {
addComment(b, today, userName);
}
else {
document.getElementsByName("newcomment")[0].value = '';
$("#commentLabel").html("Your comment was not saved in the database. Please try again or contact system admin.");
}
}
};

Ajax response received in Internet Explorer but not in Chrome:

For some reason the following code works in Internet Explorer but not in Chrome or Firefox.
in this browsers I receive the:
"Not able to retrieve sliders data."
alert.
I would love for some help with this one.
Thanks.
Here is my JavaScript code:
<script>
if (navigator.appName == "Microsoft Internet Explorer")
{
request = new ActiveXObject("Microsoft.XMLHTTP");
}
else
{
request = new XMLHttpRequest();
}
if (request == null)
alert ("Your browser doesn't support XMLHttpRequest");
function getSelectedText(elementId)
{
var elt = document.getElementById(elementId);
if (elt.selectedIndex == -1)
return null;
return elt.options[elt.selectedIndex].value;
}
function sendRequest()
{
debugger;
var type = getSelectedText('dropdown');
//alert("The chosen type: "+type);
var url = 'https://tomcat-emildesign.rhcloud.com/coupons/Client/serveranswer.jsp?type=' + type;
request.open("GET", url, true);
request.onreadystatechange= processRequest;
request.send(null);
}
function processRequest()
{
if (request.readyState == 4)
{
if (request.status == 200)
{
parseMessage();
}
else
{
alert ( "Not able to retrieve sliders data." );
}
}
}
function parseMessage()
{
// Assign the XML file to a var variable.
var doc = request.responseXML;
var pending, hires, rejected;
if(navigator.appName == "Microsoft Internet Explorer")
{
pending = doc.documentElement.getElementsByTagName('pending').item(0).text;
hires = doc.documentElement.getElementsByTagName('hires').item(0).text;
rejected = doc.documentElement.getElementsByTagName('rejected').item(0).text;
}
else
{
pending = doc.documentElement.getElementsByTagName('pending')[0].textContent;
hires = doc.documentElement.getElementsByTagName('hires')[0].textContent;
rejected = doc.documentElement.getElementsByTagName('rejected')[0].textContent;
}
alert("values:" + pending + "," + hires + "," + rejected);
}

I would replace your first if-else block with this:
// Mozilla/Safari/Non-IE
if (window.XMLHttpRequest) {
request = new XMLHttpRequest();
}
// IE
else if (window.ActiveXObject) {
request = new ActiveXObject("Microsoft.XMLHTTP");
}
Your better off testing for support of a function versus testing for the browser.

I don't see anything wrong with your code. The issue might be that you are doing a cross-domain request that is trusted in Internet Explorer but fails in other browsers.
To confirm this, you can check if the returned request.status is equal to 0.
More info on the same origin policy on Wikipedia.

How to wait for ajax request to complete in javascript when synchronous option is not available?

I'm trying to wait for the AJAX request to complete. It would be easy if the method xmlhttp.open would support async = false but Ant Galio does not support this option and only asynchronous requests are permitted. The question is how can I wait for the callback to be called.
var ajaxFinished = false;
var xmlhttp = new XMLHttpRequest();
this.debug("-- onreadystatechange is being defined");
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4) {
ajaxFinished = true;
var data = xmlhttp.responseText;
if (xmlhttp.status == 200) {
that.debug('downloadSettings: SUCCESS');
[...]
} else {
that.debug('downloadSettings:');
that.debug('-- Error: ');
that.debug('-- ResponseText: "'+data+'"')
}
}
}
while (ajaxFinished == false) {
}
this.debug("-- open connection");
xmlhttp.open("GET", requestUrl, true); /* Ant Galio does not support synchronous */
this.debug("-- send");
xmlhttp.send();
I'm looking for some kind of active waiting. I know about another solution but I'm interested in a solution that would not require changing more of the code than is my example above.
Thanks!

yes, you can
function getFile(url) {
if (window.XMLHttpRequest) {
AJAX=new XMLHttpRequest();
} else {
AJAX=new ActiveXObject("Microsoft.XMLHTTP");
}
if (AJAX) {
AJAX.open("GET", url, false);
AJAX.send(null);
return AJAX.responseText;
} else {
return false;
}
}
var fileFromServer = getFile('http://somedomain.com/somefile.txt');
w3c definition http://www.w3.org/TR/XMLHttpRequest/#the-open()-method
client . open(method, url [, async = true [, user = null [, password = null]]])

You can't. There is no "active waiting" in JavaScript, there can be only one active execution a time ("single-threaded").

There is a workaround.
Instead of using the the blocking while loop for poll use the nonblocking setInterval()..
so your code might look something like this.
var ajaxFinished = false;
var xmlhttp = new XMLHttpRequest();
this.debug("-- onreadystatechange is being defined");
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4) {
ajaxFinished = true;
var data = xmlhttp.responseText;
if (xmlhttp.status == 200) {
that.debug('downloadSettings: SUCCESS');
[...]
} else {
that.debug('downloadSettings:');
that.debug('-- Error: ");
that.debug('-- ResponseText: "'+data+'"')
}
}
}
//Polling function
function checkEvent(){
if(ajaxFinished == true){
//your code i.e xmlhttp.open("GET", requestUrl, true);
}
clearInterval(chkeventid);//Clear Interval via ID for single time execution
}
var chkeventid=self.setInterval("checkEvent()",100);//The poll call
The setInterval method is treated a bit differently in JS as you know so you may use it as against the while loop.

XMLHttpRequest and setRequestHeader in IE returns an error

I try to make Cross Domain POST requests and get back JSON encoded responses,
everything works fine except in IE 7, 8, 9.
I have try those solutions but i get this error:
Object doesn't support property or method 'setRequestHeader'
Function createXMLHTTPObject() - attempt 1
function createXMLHTTPObject() {
var xmlhttp = false;
var is_IE = window.XDomainRequest ? true : false;
if (is_IE) {
xmlhttp = new window.XDomainRequest();
} else {
if (window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
} else {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
}
return xmlhttp;
}
Function createXMLHTTPObject() - attempt 2
var XMLHttpFactories = [
function() { return new XMLHttpRequest() },
function() { return new ActiveXObject("Msxml2.XMLHTTP") },
function() { return new ActiveXObject("Msxml3.XMLHTTP") },
function() { return new ActiveXObject("Microsoft.XMLHTTP") }
];
function createXMLHTTPObject() {
var xmlhttp = false;
for (var i=0; i<XMLHttpFactories.length; i++) {
try {
xmlhttp = XMLHttpFactories[i]();
}
catch(e) {
continue;
}
break;
}
return xmlhttp;
}
Function send()
Here it returns the error, at: req.setRequestHeader('User-Agent', 'XMLHTTP/1.0');
function send(postData, callback) {
var url = 'http://domain.com/ajax-processing.php'; //url overlap
var req = createXMLHTTPObject();
if (!req) return;
var method = (postData) ? "POST" : "GET";
req.open(method, url, true);
req.setRequestHeader('User-Agent', 'XMLHTTP/1.0');
if (postData) {
req.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
}
req.onreadystatechange = function() {
if (req.readyState != 4) return;
if (req.status != 200 && req.status != 304) {
console.log('HTTP error ' + req.status);
return;
}
callback(req);
}
if (req.readyState == 4) return;
req.send(postData);
}
Here i call the send function
var insert = 'id=1&type=insert';
CLib.send(insert, function(data) {
console.log(data);
});
Is it possible to make Cross Domain requests in IE?
How i can leave behind this part, without using any other library like jQuery?

Thanks a lot #Esailija who inform me that i can't make set request headers with the XDomainRequest.
So i tried other methods and solutions also and i finally came back with a simpler method:
changed the POST requests to GET and everything working fine after some small changes.