My ajax request is never entering success:function(resp){ ...}
I'm getting a response status of 200 and the Json response obtained is not null.
My ajax function:
$.ajax({
url: '/url/',
type: 'GET',
data: {
pass_value: 0,
req_time_last_ack_update: 0,
},
dataType: "json",
success : function (resp) {
// Compiler is never entering here [I checked with Mozilla debugger]
},
error: function(){
....
}
});
Can anyone please help me find the reason for this failure?
(Question edited for clarification)
If you are trying to step into this directly after the call it will not work.
The Ajax request you are sending happens Asynchronously.
Only as soon as a response is received from the server (this could be several seconds later) you will see a breakpoint being hit (if you set one) inside the success method.
I am trying to make a JSONP request to a server. This is my code:
$.ajax({
type: 'GET',
url: myURL,
async: false,
crossDomain: true,
dataType: 'jsonp',
jsonpCallback: 'jsonCallback',
headers: {
'Accept': 'application/json', //this is required by the server
'key': key
},
success: function() {
alert('1');
},
error: function() {
alert('2');
},
complete: function(){
alert('3');
}
});//code indentation
When I run the code it errors. But if I open the developers tools in Chrome (ctrl+shift+I) I can see the request under "network". Clicking on it shows the correct response (and shows the request was accepted).
Apologies is there is a really obvious solution (I have tried searching, but with no luck), but at this point I am well and truly baffled. Any help would be really appreciated.
::EDIT::
changing the error function to:
error: function() {
console.log('error', arguments);
},
returned the message "jsonCallback was not called" Thanks to Aaron Digulla below.
The response from the server is JSON, not JSONP (checked with JSONlint)
When you say "it errors", my guess is that you get alert(2). To find out why, log the function arguments to the console:
...
error: function() {
console.log('error', arguments);
},
...
jQuery will pass additional information (like the error message) to the function. That should help you understand why it fails.
The same is true for the success function which gets the server response, for example.
[EDIT]
I get the error jsonCallback was not called
That means your server isn't returning JSONP. JSONP looks like name({...}) while normal JSON looks like {...}. Please check your server's configuration and make sure it actually supports JSONP and that the response looks correct.
I should have seen this from your code:
dataType: 'jsonp'
headers: {
'Accept': 'application/json', //this is required by the server
}
That means you're sending a JSONP/JSON mix which can't work. If you use a certain dataType, then let jQuery build the correct headers.
The success function has argument and from that argument you can get the response text.
$.ajax({
type: 'GET',
url: myURL,
async: false,
crossDomain: true,
dataType: 'jsonp',
jsonpCallback: 'jsonCallback',
headers: {
'Accept': 'application/json', //this is required by the server
'key': key
},
success: function(response) {
alert(response);
alert('1');
},
error: function() {
alert('2');
},
complete: function(){
alert('3');
}
});
You cannot set async: false for a jsonp request due to nature of it, adding script tag to handle response method.
dataType: 'jsonp
as you mentioned,the type of data that you're expecting back from the server is jsonp but may be your server will return any other format rather than jsonp.. so check it which type of response your server is returning in under Network in browser console... then if it is not jsonp format, change your respons return type....
I am using a jsonp ajax request with jQuery to send some data. When this data could not be processed for some reason, I would like to return the result with a http status other than 200. This way I can use my access logs to parse them for statistics.
Unfortunately, I don't get any response when the status code is not 200, although the jQuery callback is in the response body (when I check with firebug). Is there a way to catch the response?
$.ajax({
type: 'GET',
url: '{{ sendMsgUrl }}',
async: false,
data: { 'form': formData },
dataType: 'jsonp',
success: function(json2) {
if (json2.status == 'ok')
// do stuff
else {
// output error
};
},
error: function(xhr, status, error) {
// this doesn't work: it never gets here
alert(xhr.responseText);
var json2 = eval("("+xhr.responseText+")");
}
}).fail(function(jqXhr) {
// never gets here either
alert('status '+jqXhr.responseJSON);
});
No. JSONP doesn't use XHR. It injects a <script> element into the page.
In theory, you might be able to find an error event handler to that script, but it won't fire for cross-origin requests (and there isn't much point in using JSONP unless you are making a cross-origin request).
You'll never get any details of the HTTP response headers in any event handler when using JSONP.
Im using MVC on server side and calling a function via jQuery.Ajax sending json type.
the function results with exception.
i want to invoke/trigger the error result function of the Ajax, what should i send back with the return JSON function?
for the example, let's say the return JSON is triggered from the catch section.
MVC Function
public JsonResult Func()
{
try
{
var a = 0;
return Json(a, JsonRequestBehavior.AllowGet);
}
catch (Exception ex)
{
FxException.CatchAndDump(ex);
return Json(" ", JsonRequestBehavior.AllowGet);
}
}
JavasScript call
$.ajax({
url: '../Func',
type: 'GET',
traditional: true,
contentType: "application/json; charset=utf-8",
dataType: 'json',
success: function (data) {
alert('s');
},
error: function (data) {
alert('e');
}
});
Quoting from this answer:
The error callback will be executed when the response from the server is not going to be what you were expecting. So for example in this situations it:
HTTP 404/500 or any other HTTP error message has been received
data of incorrect type was received (i.e. you have expected JSON, you have received something else).
The error callback will be executed when the response from the server is not going to be what you were expecting. So for example in this situations it:
HTTP 404/500 or any other HTTP error message has been received
data of incorrect type was received (i.e. you have expected JSON, you have received something else).
In your situation the data is correct (it's a JSON message). If you want to manually trigger the error callback based on the value of the received data you can do so quite simple. Just change the anonymous callback for error to named function.
function handleError(xhr, status, error){
//Handle failure here
}
$.ajax({
url: url,
type: 'GET',
async: true,
dataType: 'json',
data: data,
success: function(data) {
if (whatever) {
handleError(xhr, status, ''); // manually trigger callback
}
//Handle server response here
},
error: handleError
});
error callback is invoked when HTTP response code is not 200 (success) as well as when response content is not comply to expected contentType which is json in your case.
So you have to either send HTTP header with some failure response code (e.g. 404) or output non-json response content. In the latter case you can simply output empty string:
return "";
If you want to trigger an error in AJAX, but still know "why" it was triggered so you can customize the error message, see this post:
https://stackoverflow.com/a/55201895/3622569
I have a registration form and am using $.ajax to submit it.
This is my AJAX request:
$(document).ready(function() {
$("form#regist").submit(function() {
var str = $("#regist").serialize();
$.ajax({
type: 'POST',
url: 'submit1.php',
data: $("#regist").serialize(),
dataType: 'json',
success: function() {
$("#loading").append("<h2>you are here</h2>");
}
});
return false;
});
});
In my submit1.php file I check for the existence of fields email address and username in the database.
I wish to display an error message if those value exist without a page refresh.
How can I add this to the success callback of my AJAX request?
The result is probably not in JSON format, so when jQuery tries to parse it as such, it fails. You can catch the error with error: callback function.
You don't seem to need JSON in that function anyways, so you can also take out the dataType: 'json' row.
Although the problem is already solved i add this in the hope it will help others.
I made the mistake an tried to use a function directly like this (success: OnSuccess(productID)). But you have to pass an anonymous function first:
function callWebService(cartObject) {
$.ajax({
type: "POST",
url: "http://localhost/AspNetWebService.asmx/YourMethodName",
data: cartObject,
contentType: "application/x-www-form-urlencoded",
dataType: "html",
success: function () {
OnSuccess(cartObject.productID)
},
error: function () {
OnError(cartObject.productID)
},
complete: function () {
// Handle the complete event
alert("ajax completed " + cartObject.productID);
}
}); // end Ajax
return false;
}
If you do not use an anonymous function as a wrapper OnSuccess is called even if the webservice returns an exception.
I tried removing the dataType row and it didn't work for me. I got around the issue by using "complete" instead of "success" as the callback. The success callback still fails in IE, but since my script runs and completes anyway that's all I care about.
$.ajax({
type: 'POST',
url: 'somescript.php',
data: someData,
complete: function(jqXHR) {
if(jqXHR.readyState === 4) {
... run some code ...
}
}
});
in jQuery 1.5 you can also do it like this.
var ajax = $.ajax({
type: 'POST',
url: 'somescript.php',
data: 'someData'
});
ajax.complete(function(jqXHR){
if(jqXHR.readyState === 4) {
... run some code ...
}
});
Make sure you're not printing (echo or print) any text/data prior to generate your JSON formated data in your PHP file. That could explain that you get a -sucessfull 200 OK- but your sucess event still fails in your javascript. You can verify what your script is receiving by checking the section "Network - Answer" in firebug for the POST submit1.php.
Put an alert() in your success callback to make sure it's being called at all.
If it's not, that's simply because the request wasn't successful at all, even though you manage to hit the server. Reasonable causes could be that a timeout expires, or something in your php code throws an exception.
Install the firebug addon for firefox, if you haven't already, and inspect the AJAX callback. You'll be able to see the response, and whether or not it receives a successful (200 OK) response. You can also put another alert() in the complete callback, which should definitely be invoked.
I was returning valid JSON, getting a response of 200 in my "complete" callback, and could see it in the chrome network console... BUT I hadn't specified
dataType: "json"
once I did, unlike the "accepted answer", that actually fixed the problem.
I had same problem. it happen because javascript expect json data type in returning data. but if you use echo or print in your php this situation occur. if you use echo function in php to return data, Simply remove dataType : "json" working pretty well.
You must declare both Success AND Error callback. Adding
error: function(err) {...}
should fix the problem
I'm using XML to carry the result back from the php on the server to the webpage and I have had the same behaviour.
In my case the reason was , that the closing tag did not match the opening tag.
<?php
....
header("Content-Type: text/xml");
echo "<?xml version=\"1.0\" encoding=\"utf-8\"?>
<result>
<status>$status</status>
<OPENING_TAG>$message</CLOSING_TAG>
</result>";
?>
I had this problem using an ajax function to recover the user password from Magento. The success event was not being fired, then I realized there were two errors:
The result was not being returned in JSON format
I was trying to convert an array to JSON format, but this array had non-utf characters
So every time I tried to use json_eoncde() to encode the returning array, the function was not working because one of its indexes had non-utf characters, most of them accentuation in brazilian portuguese words.
I tried to return string from controller but why control returning to error block not in success of ajax
var sownum="aa";
$.ajax({
type : "POST",
contentType : 'application/json; charset=utf-8',
dataType : "JSON",
url : 'updateSowDetails.html?sownum=' + sownum,
success : function() {
alert("Wrong username");
},
error : function(request, status, error) {
var val = request.responseText;
alert("error"+val);
}
});
I faced the same problem when querying controller which does not return success response, when modified my controller to return success message problem was solved.
note using Lavalite framework.
before:
public function Activity($id)
{
$data=getData();
return
$this->response->title('title')
->layout('layout')
->data(compact('data'))
->view('view')
->output();
}
after code looks like:
try {
$attributes = $request->all();
//do something
return $this->response->message('')
->code(204)
->status('success')
->url('url'. $data->id)
->redirect();
} catch (Exception $e) {
return $this->response->message($e->getMessage())
->code(400)
->status('error')
->url('nothing Wrong')
->redirect()
}
this worked for me
I had the same problem i solved it in that way:
My ajax:
event.preventDefault();
$.ajax('file.php', {
method: 'POST',
dataType: 'json',
contentType: 'application/json',
data: JSON.stringify({tab}),
success: function(php_response){
if (php_response == 'item')
{
console.log('it works');
}
}
})
Ok. The problem is not with json but only php response.
Before: my php response was:
echo 'item';
Now:
$variable = 'item';
echo json.encode($variable);
Now my success working.
PS. Sorry if something is wrong but it is my first comment on this forum :)
in my case the error was this was in the server side and for that reason it was returning a html
wp_nonce_field(basename(__FILE__), "mu-meta-box-nonce");
Add 'error' callback (just like 'success') this way:
$.ajax({
type: 'POST',
url: 'submit1.php',
data: $("#regist").serialize(),
dataType: 'json',
success: function() {
$("#loading").append("<h2>you are here</h2>");
},
error: function(jqXhr, textStatus, errorMessage){
console.log("Error: ", errorMessage);
}
});
So, in my case I saw in console:
Error: SyntaxError: Unexpected end of JSON input
at parse (<anonymous>), ..., etc.
The success callback takes two arguments:
success: function (data, textStatus) { }
Also make sure that the submit1.php sets the proper content-type header: application/json