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Checking if form has been submitted via ajax - PHP

As the title says, I wanna check if this ajax method has been submitted or not and show the result in a condition.
Here is the Ajax POST code;
$.ajax({
url: "addorderInfo.php", // Url to which the request is sent
type: "POST", // Type of request to be send, called as method
data: new FormData(this), // Data sent to server, a set of key/value pairs (i.e. form fields and values)
contentType: false, // The content type used when sending data to the server.
cache: false, // To unable request pages to be cached
processData:false,
success: handleResult
});
And here is the condition I put but it is not working.
function handleResult(data){
if(data == 'error'){
window.location.href ='404.php';
}
else{
$( "#clearcart" ).click();
window.location.href = "ordercomplited.php";
}
}

try this
$.ajax({
url: "addorderInfo.php",
type: "POST",
data: new FormData(this),
contentType: false,
cache: false,
processData:false,
success: function (data) {
alert(data)
},
error: function (error) {
alert(error.responseText) // if your request doesn't work
}
});

There isn't sufficient code to know why is not working.
IMHO the ajax call is not handling the error. Try to edit your code as follow:
$.ajax({
url: "addorderInfo.php", // Url to which the request is sent
type: "POST", // Type of request to be send, called as method
data: new FormData(this), // Data sent to server, a set of key/value pairs (i.e. form fields and values)
contentType: false, // The content type used when sending data to the server.
cache: false, // To unable request pages to be cached
processData:false,
success: function(data) {
handleResult(data);
}
error: function(data) {
handleError(data);
}
});

How to show only the last ajax request result

Total up the amount of the ajax request and show the ajax response when it is the last ajax response.
In other words, how to use only the response of last sent ajax request.
var req=0;
function ajaxReq(){
req++; /total up the amount of request/
$.ajax({
url: "result.php",
type: 'GET',
contentType: false,
enctype: 'multipart/form-data',
cache: false,
processData: false,
success: function(response) {
if(req==1){ /show the response when this is the last request/
$("#response-element").html(response);
}
req--; /Subtract when every success ajax response/
}
});
}
I using this on viewing messages detail
if the user clicked few threads before the response show out it will show the previous thread detail before the current selected thread detail shown out
Any better solution would be nice for sharing

You should decrement as soon as you send request.
var req=""; // should be a number
function ajaxReq(){
req++; /total up the amount of request/
$.ajax({
url: "result.php",
type: 'GET',
contentType: false,
enctype: 'multipart/form-data',
cache: false,
processData: false,
beforeSend: function() {
if (req > 1) req -= 1;
},
success: function(response) {
if(req==1){ /show the response when this is the last request/
$("#response-element").html(response);
req -= 1;
}
}
});
}

You are more or less on the right lines. This is the only way you can avoid the callbacks of previous calls. You will have to associate an ID with each request and then check if the ID of the request is the last sent request.
var sentReqCount = 0;
setInterval(function() {
sentReqCount++;
ajaxReq(sentReqCount);
}, 100);
function ajaxReq(thisReqId) {
$.ajax({
url: "result.php",
type: 'GET',
contentType: false,
enctype: 'multipart/form-data',
cache: false,
processData: false,
success: function(response) {
if (thisReqId === sentReqCount) {
$("#response-element").html(response);
}
}
});
}

jQuery Ajax authorization request header

I have a problem with AJAX request to my external API.
I tried to develop login from jQuery to API like that:
$.ajax({
type: "GET",
dataType: "json",
crossDomain: true,
cache: false,
url: __Configuration.apiURL+"/login",
xhrFields: {
withCredentials: true
},
beforeSend: function(xhr) {
xhr.setRequestHeader("Authorization", Login.MakeAuth(email, password));
},
success: function(data){
}
});
Everything looks ok when login and username are correct,
but when i tried to put wrong login and password then Ajax returns authorization window (prompt) from api.. so my problem is: how to prevent from that? I don't want to see this prompt...

Ajax don't return response

Hello i trying to to save response from htmlpage and save the content of this page, but i always getting an error.What i am doing wrong?
<script type="text/jscript">
var page = "";
$.ajax({
url: "https://www.bbvanetcash.com/local_kyop/KYOPSolicitarCredenciales.html",
type: "GET",
cache: false,
crossDomain: true,
cache: false,
contentType: "application/json; charset=utf-8",
data: {},
jsonp: 'jsonCallback',
dataType: "jsonp",
success: function (data) {
page = data;
console.log("Good");
},
error: function (e) {
console.log("Error");//here where i am stuck
}
});
</script>

"https://www.bbvanetcash.com/local_kyop/KYOPSolicitarCredenciales.html" - i think its URL belong from other domain not from your home/base domain url. that's why you getting error.
You can not make a AJAX http request for NON HOME url.
NON HOME: Its means you can only access your Base domain content though ajax.

Ajax appending nonce to js files

I'm getting a unique nonce (i think a timestamp) appended to all and any of my js files every time I send a request to my rails web service:
I'm fairly sure the error has to do with the ajax call, because of jquery.ajax documentation which states cache:true in your ajax request will stop ajax from appending "_={timestamp}" to the get parameters.
I have set cache: true with no luck. How else can I stop these nonces from being applied?
ajax:
$.ajax({
beforeSend: function (xhr) {
xhr.setRequestHeader ('Authorization', api_key);
},
cache: true,
dataType: 'html',
type: 'GET',
url: url+'/gwsearch/ajax_search?d1='+d1_val+'&d2='+d2_val,
crossDomain: true,
success:function(result) {
$("#display").html(result);
},
error: function(result) {
$('#display').html('Unauthorized client.');
}
});

I solved this using an ajax prefilter:
$.ajaxPrefilter('script', function(options) {
options.cache = true;
});