I'm newbie in asp.net mvc, I try to create a post data using ajax, when in the development is run well, but when I try to publish web in server I get the error when post data, the error like this POST https://example.com/login-testing 500 (Internal Server Error). I try to look for many examples but fail all.
this is my code, may be you can find any problem in my code:
JS script in index.cshtml
function login() {
var email = $('#input-email').val();
var password = $('#input-password').val();
if (email && password) {
$.ajax({
url: '#Url.Action("LoginTesting", "Auth")',
type: 'POST',
data: JSON.stringify({
email: email,
password: password
}),
dataType: 'json',
contentType: 'application/json',
success: function (data){
console.log(data);
if (data == 1) {
window.location.href = '#Url.Action("Index", "Home")';
} else {
$('#login-warning').show();
}
},
error: function (data) {
$('#login-warning').show();
}
});
} else if (!email) {
$('#text-danger-email').show();
} else if (!password) {
$('#text-danger-password').show();
}
}
controller
[Route("login-testing")]
public JsonResult LoginTesting(LoginViewModel smodel)
{
var email = smodel.email;
var password = smodel.password;
DBHandle sdb = new DBHandle();
var account = sdb.GetLoginVerify(email);
if (account.password != null)
{
if (BCrypt.Net.BCrypt.Verify(password, account.password ))
{
var detail = sdb.GetUserDetail(account.id);
if (detail != null)
{
Session["is_login"] = true;
Session["id"] = detail.id;
Session["fullname"] = detail.fullname;
Session["id_levels"] = detail.id_levels;
Session["levels"] = detail.levels;
return Json(1);
}
else
{
return Json(2);
}
}
else
{
return Json(3);
}
}
else
{
return Json(4);
}
}
Please anyone help me to solve this problem.
Thanks.
Internal Server Error probably means something is wrong with your program.cs file .The order in which they are placed is important,improper placements could actually give rise to these errors.
500 internal server also means , there is something wrong with your Code,
according to me Go to Chrome Dev Tool and Click on Network Tab, in that Click on XHR tab
there your API call must located with red Highlighted text (Since its 500 internal server error ), Click on it, right side window will be appear then
click on Preview Tab , you might see which line of Code causing the issue
You can also Debug the Code , and step over code line by line, and check what is wrong.
Is it possible that using jQuery, I cancel/abort an Ajax request that I have not yet received the response from?
Most of the jQuery Ajax methods return an XMLHttpRequest (or the equivalent) object, so you can just use abort().
See the documentation:
abort Method (MSDN). Cancels the current HTTP request.
abort() (MDN). If the request has been sent already, this method will abort the request.
var xhr = $.ajax({
type: "POST",
url: "some.php",
data: "name=John&location=Boston",
success: function(msg){
alert( "Data Saved: " + msg );
}
});
//kill the request
xhr.abort()
UPDATE:
As of jQuery 1.5 the returned object is a wrapper for the native XMLHttpRequest object called jqXHR. This object appears to expose all of the native properties and methods so the above example still works. See The jqXHR Object (jQuery API documentation).
UPDATE 2:
As of jQuery 3, the ajax method now returns a promise with extra methods (like abort), so the above code still works, though the object being returned is not an xhr any more. See the 3.0 blog here.
UPDATE 3: xhr.abort() still works on jQuery 3.x. Don't assume the update 2 is correct. More info on jQuery Github repository.
You can't recall the request but you can set a timeout value after which the response will be ignored. See this page for jquery AJAX options. I believe that your error callback will be called if the timeout period is exceeded. There is already a default timeout on every AJAX request.
You can also use the abort() method on the request object but, while it will cause the client to stop listening for the event, it may probably will not stop the server from processing it.
Save the calls you make in an array, then call xhr.abort() on each.
HUGE CAVEAT: You can abort a request, but that's only the client side. The server side could still be processing the request. If you are using something like PHP or ASP with session data, the session data is locked until the ajax has finished. So, to allow the user to continue browsing the website, you have to call session_write_close(). This saves the session and unlocks it so that other pages waiting to continue will proceed. Without this, several pages can be waiting for the lock to be removed.
It's an asynchronous request, meaning once it's sent it's out there.
In case your server is starting a very expensive operation due to the AJAX request, the best you can do is open your server to listen for cancel requests, and send a separate AJAX request notifying the server to stop whatever it's doing.
Otherwise, simply ignore the AJAX response.
AJAX requests may not complete in the order they were started. Instead of aborting, you can choose to ignore all AJAX responses except for the most recent one:
Create a counter
Increment the counter when you initiate AJAX request
Use the current value of counter to "stamp" the request
In the success callback compare the stamp with the counter to check if it was the most recent request
Rough outline of code:
var xhrCount = 0;
function sendXHR() {
// sequence number for the current invocation of function
var seqNumber = ++xhrCount;
$.post("/echo/json/", { delay: Math.floor(Math.random() * 5) }, function() {
// this works because of the way closures work
if (seqNumber === xhrCount) {
console.log("Process the response");
} else {
console.log("Ignore the response");
}
});
}
sendXHR();
sendXHR();
sendXHR();
// AJAX requests complete in any order but only the last
// one will trigger "Process the response" message
Demo on jsFiddle
We just had to work around this problem and tested three different approaches.
does cancel the request as suggested by #meouw
execute all request but only processes the result of the last submit
prevents new requests as long as another one is still pending
var Ajax1 = {
call: function() {
if (typeof this.xhr !== 'undefined')
this.xhr.abort();
this.xhr = $.ajax({
url: 'your/long/running/request/path',
type: 'GET',
success: function(data) {
//process response
}
});
}
};
var Ajax2 = {
counter: 0,
call: function() {
var self = this,
seq = ++this.counter;
$.ajax({
url: 'your/long/running/request/path',
type: 'GET',
success: function(data) {
if (seq === self.counter) {
//process response
}
}
});
}
};
var Ajax3 = {
active: false,
call: function() {
if (this.active === false) {
this.active = true;
var self = this;
$.ajax({
url: 'your/long/running/request/path',
type: 'GET',
success: function(data) {
//process response
},
complete: function() {
self.active = false;
}
});
}
}
};
$(function() {
$('#button').click(function(e) {
Ajax3.call();
});
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input id="button" type="button" value="click" />
In our case we decided to use approach #3 as it produces less load for the server. But I am not 100% sure if jQuery guarantees the call of the .complete()-method, this could produce a deadlock situation. In our tests we could not reproduce such a situation.
It is always best practice to do something like this.
var $request;
if ($request != null){
$request.abort();
$request = null;
}
$request = $.ajax({
type : "POST", //TODO: Must be changed to POST
url : "yourfile.php",
data : "data"
}).done(function(msg) {
alert(msg);
});
But it is much better if you check an if statement to check whether the ajax request is null or not.
Just call xhr.abort() whether it's jquery ajax object or native XMLHTTPRequest object.
example:
//jQuery ajax
$(document).ready(function(){
var xhr = $.get('/server');
setTimeout(function(){xhr.abort();}, 2000);
});
//native XMLHTTPRequest
var xhr = new XMLHttpRequest();
xhr.open('GET','/server',true);
xhr.send();
setTimeout(function(){xhr.abort();}, 2000);
You can abort any continuous ajax call by using this
<input id="searchbox" name="searchbox" type="text" />
<script src="http://code.jquery.com/jquery-1.11.0.min.js"></script>
<script type="text/javascript">
var request = null;
$('#searchbox').keyup(function () {
var id = $(this).val();
request = $.ajax({
type: "POST", //TODO: Must be changed to POST
url: "index.php",
data: {'id':id},
success: function () {
},
beforeSend: function () {
if (request !== null) {
request.abort();
}
}
});
});
</script>
As many people on the thread have noted, just because the request is aborted on the client-side, the server will still process the request. This creates unnecessary load on the server because it's doing work that we've quit listening to on the front-end.
The problem I was trying to solve (that others may run in to as well) is that when the user entered information in an input field, I wanted to fire off a request for a Google Instant type of feel.
To avoid firing unnecessary requests and to maintain the snappiness of the front-end, I did the following:
var xhrQueue = [];
var xhrCount = 0;
$('#search_q').keyup(function(){
xhrQueue.push(xhrCount);
setTimeout(function(){
xhrCount = ++xhrCount;
if (xhrCount === xhrQueue.length) {
// Fire Your XHR //
}
}, 150);
});
This will essentially send one request every 150ms (a variable that you can customize for your own needs). If you're having trouble understanding what exactly is happening here, log xhrCount and xhrQueue to the console just before the if block.
I was doing a live search solution and needed to cancel pending requests that may have taken longer than the latest/most current request.
In my case I used something like this:
//On document ready
var ajax_inprocess = false;
$(document).ajaxStart(function() {
ajax_inprocess = true;
});
$(document).ajaxStop(function() {
ajax_inprocess = false;
});
//Snippet from live search function
if (ajax_inprocess == true)
{
request.abort();
}
//Call for new request
Just use ajax.abort() for example you could abort any pending ajax request before sending another one like this
//check for existing ajax request
if(ajax){
ajax.abort();
}
//then you make another ajax request
$.ajax(
//your code here
);
there is no reliable way to do it, and I would not even try it, once the request is on the go; the only way to react reasonably is to ignore the response.
in most cases, it may happen in situations like: a user clicks too often on a button triggering many consecutive XHR, here you have many options, either block the button till XHR is returned, or dont even trigger new XHR while another is running hinting the user to lean back - or discard any pending XHR response but the recent.
The following code shows initiating as well as aborting an Ajax request:
function libAjax(){
var req;
function start(){
req = $.ajax({
url: '1.php',
success: function(data){
console.log(data)
}
});
}
function stop(){
req.abort();
}
return {start:start,stop:stop}
}
var obj = libAjax();
$(".go").click(function(){
obj.start();
})
$(".stop").click(function(){
obj.stop();
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="button" class="go" value="GO!" >
<input type="button" class="stop" value="STOP!" >
If xhr.abort(); causes page reload,
Then you can set onreadystatechange before abort to prevent:
// ↓ prevent page reload by abort()
xhr.onreadystatechange = null;
// ↓ may cause page reload
xhr.abort();
I had the problem of polling and once the page was closed the poll continued so in my cause a user would miss an update as a mysql value was being set for the next 50 seconds after page closing, even though I killed the ajax request, I figured away around, using $_SESSION to set a var won't update in the poll its self until its ended and a new one has started, so what I did was set a value in my database as 0 = offpage , while I'm polling I query that row and return false; when it's 0 as querying in polling will get you current values obviously...
I hope this helped
I have shared a demo that demonstrates how to cancel an AJAX request-- if data is not returned from the server within a predefined wait time.
HTML :
<div id="info"></div>
JS CODE:
var isDataReceived= false, waitTime= 1000;
$(function() {
// Ajax request sent.
var xhr= $.ajax({
url: 'http://api.joind.in/v2.1/talks/10889',
data: {
format: 'json'
},
dataType: 'jsonp',
success: function(data) {
isDataReceived= true;
$('#info').text(data.talks[0].talk_title);
},
type: 'GET'
});
// Cancel ajax request if data is not loaded within 1sec.
setTimeout(function(){
if(!isDataReceived)
xhr.abort();
},waitTime);
});
This is my implementation based on many answers above:
var activeRequest = false; //global var
var filters = {...};
apply_filters(filters);
//function triggering the ajax request
function apply_filters(filters){
//prepare data and other functionalities
var data = {};
//limit the ajax calls
if (activeRequest === false){
activeRequest = true;
}else{
//abort if another ajax call is pending
$request.abort();
//just to be sure the ajax didn't complete before and activeRequest it's already false
activeRequest = true;
}
$request = $.ajax({
url : window.location.origin + '/your-url.php',
data: data,
type:'POST',
beforeSend: function(){
$('#ajax-loader-custom').show();
$('#blur-on-loading').addClass('blur');
},
success:function(data_filters){
data_filters = $.parseJSON(data_filters);
if( data_filters.posts ) {
$(document).find('#multiple-products ul.products li:last-child').after(data_filters.posts).fadeIn();
}
else{
return;
}
$('#ajax-loader-custom').fadeOut();
},
complete: function() {
activeRequest = false;
}
});
}
Obviously I am using #Html.ValidationSummary() in my View to display any errors that may have occurred when the user posted to my controller.
However this is my scenario
The user posts to the controller and ModelState.IsValid = false;
#Html.ValidationSummary() displays my error message to the user.
Now the user corrects the error and clicks the submit button. However I want to clear that error message because I may present the user another option (client side script) prior to the post actually occurring.
I've tried various techniques for hiding the Validation Summary section to no avail.
function resetValidation() {
$("form").data("valmsg-summary").hide();
$(".field-validation-error").addClass("field-validation-valid");
$(".input-validation-error").addClass("input-validation-valid");
$(".validation-summary-errors").addClass("validation-summary-valid");
$(".field-validation-error").removeClass("field-validation-error");
$(".input-validation-error").removeClass("input-validation-error");
$(".validation-summary-errors").removeClass("validation-summary-errors");
};
This is the script of my Submit button.
$("#btnSubmit").click(function (e) {
resetValidation(); // Trying to suppress/clear error messages
var doPost = true;
var p1 = $("#Field1").val();
var p2 = $("#Field2").val();
var p3 = $("#Field3").val();
$.ajax({
type: "GET",
url: "/MyController/MyAction",
data: { "param1": p1, "param2": p2, "param3": p3 },
async: false
}).done(function (data) {
if (data > 999)
{
// I then display a new set of fields for the user to answer
doPost = false;
}
}).fail(function (xhr, status, err) {
alert(xhr.responseText);
});
return doPost;
});
Am I going about this the wrong way?Is it possible to clear the modelview errors client side?
Thanks to Stephen Muecke for the solution:
$(".validation-summary-errors").empty();
The thing is that i have an embedded python interpreter and after a user presses "Run", the output from interpreter gets transferred to a pre element. I want to take that data from pre element and send it to django server through AJAX. The problem is that even after assigning of that data to a variable, django gets nothing. Also i can start interpreter and AJAX script only after pressing "Run", both work work with onclick. I am using POST request.
`$(document).ready(function(){
$('#run').click(function(){
var input_string = String(document.getElementById("output").innerHTML);
alert(input_string);
$.ajax({
url: '/courses/python3/lesson_validate/{{ lesson_number }}/',
data: {"text": input_string, csrfmiddlewaretoken: '{{ csrf_token }}'},
dataType: "json",
type:"POST",
success: function(data, textStatus){
alert('get_response');
alert(data);
},
error : function(xhr,errmsg,err) {
alert(xhr.status + ": " + xhr.responseText);
}
});
});
});
`
So that code works perfectly
var input_string = String(document.getElementById("output").innerHTML);
alert(input_string);
but when i try to use that variable in ajax, server fails to get it.
I tried using async: false, it doesn't change anything.
This is view code:
`def lesson_validate(request,lesson_number):
args = {}
args.update(csrf(request))
out_compare = Lessons.objects.get(id=lesson_number).lesson_output
if request.method == "POST" and request.POST.get('text') == out_compare:
text = "they are equal"
return HttpResponse(json.dumps(text), content_type='application/javascript')
else:
args['testtest']=request.POST.get('text')
return render_to_response('course_lesson.html', args, context_instance=RequestContext(request))`
After i check request.POST.get('text') it is empty
The question is how can i get data from ajax, from a variable assigned before, not just from a sting?
It looks like you're sending JSON to the server in that request, so to get the variables in Django you'd need to do:
def lesson_validate(request,lesson_number):
import json
data = json.loads(request.body)
text = data.get('text')
# Do stuff.
I am using the TinyMCE control in a MVC page, and now I want to save the content of the control (hopefully with ajax so the page is not rendered again)... I have some javascript that looks like this:
mysave = function() {
var ed = tinyMCE.get('content');
// Do you ajax call here, window.setTimeout fakes ajax call
ed.setProgressState(1); // Show progress
window.setTimeout(function() {
ed.setProgressState(0); // Hide progress
alert(ed.getContent());
}, 3000);
};
What is the best way to pass the content back to the controller, save it, and return back to the same page?
well, use jQuery.ajax. http://docs.jquery.com/Ajax. I suggest you to use POST request so you can transfer arbitrary long texts.
How do you plan to save the text? Do you use any database engine? we need more information.
$.ajax({
url: "/controller/savetext",
cache: false,
type: "POST",
data: { text: ed.getContent() },
success: function(msg) {
alert("text saved!");
},
error: function(request, status, error) {
alert("an error occurred: " + error);
}
})
and on server side something like this:
string text = Request.Form["text"]