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How to wait until multiple ajax requests are done?

I have some async ajax requests
$.ajax({
url: 'first.php',
async: true,
success: function (data) {
//do stuff
}
});
$.ajax({
url: 'second.php',
async: true,
success: function (data) {
//do stuff
}
});
...
$.ajax({
url: 'nth.php',
async: true,
success: function (data) {
//do stuff
}
});
I want to run console.log() when every request is done.
I usually write this code:
$.ajax({
url: 'first.php',
async: true,
success: function (data) {
$.ajax({
url: 'second.php',
async: true,
success: function (data) {
//till the last ajax
}
});
}
});
However someone suggest Promise.all([]).
If I had to run, lets say, 4 ajax requests, which method would be the best/quickest?

Use Promise.all().
var promises = [];
promises.push(new Promise(done=>{
$.ajax({
url: 'first.php',
async: true,
success: done
});
}));
promises.push(new Promise(done=>{
$.ajax({
url: 'second.php',
async: true,
success: done
});
}));
promises.push(new Promise(done=>{
$.ajax({
url: 'nth.php',
async: true,
success: done
});
}));
Promise.all(promises).then(()=>{
console.log("All ajax completed.");
});

The official jQuery documentation states that:
The jqXHR objects returned by $.ajax() as of jQuery 1.5 implement the Promise interface, giving them all the properties, methods, and behavior of a Promise (see Deferred object for more information).
jQuery.when():
Provides a way to execute callback functions based on zero or more Thenable objects, usually Deferred objects that represent asynchronous events.
So you can do something like:
jQuery.when(
$.ajax({
url: 'first.php',
async: true,
success: function (data) {
//do stuff
}
}),
$.ajax({
url: 'second.php',
async: true,
success: function (data) {
//do stuff
}
}),
...,
$.ajax({
url: 'nth.php',
async: true,
success: function (data) {
//do stuff
}
})
).then(function() {console.log(...);});

Call function after ajax load()

I initiate a function after an ajax load(), but the function I intimate calls upon an additional function, which isn't working. How do I initiate ajaxstuff() after load()?
function ajaxstuff(data) {
$.ajax({
type: "POST",
url: "do-it.php",
data: {data},
success: function() {
console.log('I got this far'); // this doesn't work / isn't called
}
});
}
function doit() {
$('form').submit(function(e) {
e.preventDefault();
var formData = new FormData(this);
console.log('I got this far'); // this works
ajaxstuff(formData);
}
}
$('.popup-loader').click(function() {
$(this).append('<div class="popup"></div>');
$('.popup').load('popup.php', function() {
doit(); // this works
}
});

Check for errors in your console, also, in your AJAX add an async option. set it to FALSE ("Setting async to false means that the statement you are calling has to complete before the next statement in your function can be called"):
function ajaxstuff(data) {
$.ajax({
async: false,
type: "POST",
url: "do-it.php",
data: data,
success: function(result) {
console.log(result); //check in your console for errors
}
});
}

Syntax error in ajaxstuff function. data: {data}, , probably should be data: data,
Also when you're passing a FormData object to $.ajax, you have to specify processData: false and contentType: false
$.ajax({
type: "POST",
url: "do-it.php",
data: data,
processData: false,
contentType: false,
success: function() {
console.log('I got this far');
}
});

jQuery fade-in-out animation

I need to add a fade-in-out transition animation to this ajax loading code. Could someone explain me how to do it please?
JS :
function loadPage(url)
{
url=url.replace('#page','');
$('#loading').css('visibility','visible');
$.ajax({
type: "POST",
url: "load_page.php",
data: 'page='+url,
dataType: "html",
success: function(msg){
if(parseInt(msg)!=0)
{
$('#pageContent').html(msg);
$('#loading').css('visibility','hidden');
}
}
});
}

Use beforeSend() function of ajax request to fadeIn() and in success fadeOut()
$('#loading').css('visibility', 'visible');
$.ajax({
type: "POST",
url: "load_page.php",
data: 'page=' + url,
dataType: "html",
beforeSend: function () {
$('#loading').fadeIn();
},
success: function (msg) {
if (parseInt(msg) != 0) {
$('#pageContent').html(msg);
$('#loading').fadeOut();
}
}
});

I hope you want to show the effects on success of the ajax result. You may try this.
$.ajax({
type: "POST",
url: "institutions-filter.action",
data: data,
cache: false,
success: function(msg)
{
if(parseInt(msg)!=0)
{
$('#loading').css('visibility','hidden');
$("#pageContent").fadeOut(400, function()
{
$("#pageContent").html(msg).fadeIn(400);
});
}
}
});

Do something after window load

I'm doing a (simple) ajax call on window load:
$(window).load(function () {
$.ajax({
url: someUrl,
type: "get",
dataType: "",
success: function(data) {
...........
How can I do something, for instance a function or event after this ajax proces is finished. The problem is I have to append something to the data recieved by the ajax call. But I can't append on window load because the data is still being processed.

Put it in the success handler of the ajax call:
$(window).load(function () {
$.ajax({
url: someUrl,
type: "get",
dataType: "",
success: function(data) {
// do whatever you want with data
}
});
});

You can call that in the success callback function of Ajax request
success: function(data) {
myFunction() ; // If function
$('#elementID').click() // If you want to trigger a click event
}

You may use the
`$(document).ready`
So it will be similar to this:
$(document).ready(function(){
$.ajax({
url: someUrl,
type: "get",
dataType: "",
success: function(data) {
//Your code should be here

After
success: function(data) {
for (var ii = 0; ii < data.length; ii++){
building html here
}
your code here
}
you want to enter in your functions within the success function for the ajax call but before the call is complete.

You could also do
$.ajax({
url: someUrl,
type: "get",
dataType: "",
context: document.body
}).done(function() {
// do whatever when is done
onCompleteFunction();
});

this should execute your request when page is just loaded.
$(function(){
$.ajax({
url: someUrl,
type: "get",
dataType: "",
success: function(data) {
// do whatever you want with data
}
});
});
or you can do:
$(function(){
$.ajax({
url: someUrl,
type: "get",
dataType: "",
complete: function(data) {
// do whatever you want with data
}
});
});

ajax request not working on IE

function VReload()
{
$.ajax({
type: "GET",
url: "/foo/",
success: function (data) {
$("#myid").html(data);
}
});
}
$(document).ready(function() {
setInterval('VReload()', 1000)
});
This piece of code is working fine on Mozilla and chrome but not on IE. Ajax call is not firing on IE. What could be the reason.

Switch off caching by doing this:
$.ajax({
type: "GET",
cache: false,
url: "/foo/",
success: function (data) {
$("#myid").html(data);
}
});

set cache false
$.ajaxSetup({ cache: false });
or
$.ajax({
cache: false,
//other options
});

Try this:
function VReload()
{
var timestamp = new Date();
$.ajax({
type: "GET",
url: "/foo/" + "&timestamp=" + timestamp.getTime(),
success: function (data) {
$("#myid").html(data);
}
});
}
$(document).ready(function() {
setInterval('VReload()', 1000)
});

use jQuery's $.get() function
$.get('/foo/', {}, function(data){
// whatever
});