We Keep Coding

PUT type request with a file in AJAX arrives without data

I am making a request in a Laravel form (Blade).
To create the object I use a POST type request but to modify it I use a PUT type request.
I have to use AJAX and I have to send a file in the same request.
I have searched for information and with the POST type, it works correctly, but with the PUT type the request is empty.
I have been researching and testing and I have realized that the problem comes from this line of code within my "processData: false," request.
The problem is that if I don't put this line I get the error "Uncaught (in promise) TypeError: Illegal invocation".
That it was the same error that appeared in the POST request, so searching the internet I solved it like this.
Could someone help me to make the PUT request with the attached file?
My code:
const type_request = 'PUT';
const url_request = '{{ route('put_update_login', ['client' => $client, 'id' => $login->id]) }}';
let data_form = new FormData(document.getElementById(id_form));
$.ajax({
type: type_request,
url: url_request,
data: data_form,
dataType: "json",
processData: false,
contentType: false,
success: function(response) {
if (response.hasOwnProperty("route")) {
window.open(response['route'], "_self").focus();
} else {
$('#alert_error').removeAttr('hidden');
$("#alert_error").fadeTo(20000, 500000);
let errors = response['errors'];
$.each(errors, function (index, value) {
$("#alert_error").last().html(value);
});
$(':button').prop('disabled', false);
$('#spinner_form').prop('hidden', true);
}
}
});
The differences between the POST and PUT version is the "type_request" and the "url_request".
Thanks in advance

Third parameter of $.post() is not working

I am sending a post request to the REST web service using the following code:
<script type="application/javascript">
$(document).ready(function() {
$("#logbutton").click(function(event){
$.post(
"http://localhost:8080/CredentialsOnDemand/loginexpert/dologin",
{
ephone: $("#mobile").val(),
epassword: $("#password").val()
},
function(data) {
data = $.parseJSON( data );
$(".ray").html("$" + data.tag);
console.log( "You clicked a paragraph!" );
}
);
});
});
The web service gives a JSON response in format below:
{"tag":"login","status":true}
The call from the jquery code is running i.e. the web service is running fine, but the function that I have created to parse JSON is not working.
NOTE:
I tried to run this code without providing any value in the text field. The console displayed the json response and also console.log line. But when I again entered the values into the fields, then it didn't. I am unable to understand this thing.
Anyone having any idea?
Thanks in advance.

You could try the more verbose and detailed form using $.ajax:
$(document).ready(function() {
$("#logbutton").click(function(event) {
var req = {
ephone: $("#mobile").val(),
epassword: $("#password").val()
};
$.ajax({
url: "http://localhost:8080/CredentialsOnDemand/loginexpert/dologin",
data: req,
dataType: 'json',
type: 'POST'
}).done(function(data) {
console.log(data);
$(".ray").html("$" + data.tag);
console.log("You clicked a paragraph!");
}).fail(function(err) {
console.error(err);
});
});
});
This will be easier for you to pinpoint where the error is coming from

Getting Uncaught SyntaxError: Unexpected token : when reading jsonp response

I am working on a piece of code where the user clicks on a button to make a call and the status of the call is displayed to him/her.
Everything is working fine and the calls are being made too, but the server which sends the json response is on another domain and I have no control over its response. I therefore used jsonp to get the response, but no matter what i did, i keep getting the error of Uncaught SyntaxError: Unexpected token.
I am attaching my code. please help as this is a live project and I am badly stuck in it. I need a response to be alerted with the message received by the server. the message received by the server in case of success is {"success": {"status": "success", "message": "Call successfully placed"}} and in case of error is {"error": {"message": "Invalid API Key"}}. I just need to display the message part.
my code:
function makecall() {
document.getElementById('<%=click2call_submitbtn.ClientID%>').disabled = true;
var agentNum = document.getElementById('<%=lblCallFrom.ClientID%>').innerHTML;
var custNum = "+91";
custNum = custNum + document.getElementById('<%=txtNotoCall.ClientID%>').value;
document.getElementById('<%=lblCallStatus.ClientID%>').innerHTML = "Calling...";
if (validatePhone(agentNum) && validatePhone(custNum)) {
$.ajax({
url: 'http://www.knowlarity.com/vr/api/click2call/?api_key=9e69eab0-1ec7-11e3-866c-16829204aaa4&agent_number=agent_number_variable&phone_number=Caller_number_variable&sr_number=%2B918881692001&response_format=json'.replace('Caller_number_variable', custNum.replace('+', '%2B')).replace('agent_number_variable', agentNum.replace('+', '%2B')),
type: 'GET',
cache: false,
dataType: 'jsonp',
success: function (res) {
alert(JSON.stringify(res));
},
error: function (res) {
alert(JSON.stringify(res));
}
});
} else {
document.getElementById('<%=lblCallStatus.ClientID%>').innerHTML = "Num. should be a valid 10 digit mobile no.";
document.getElementById('<%=click2call_submitbtn.ClientID%>').disabled = false;
}
}

Try using this as an absolute minimum where you can pass in valid hard wired values for the numbers:
var url = 'http://ip.jsontest.com/ ';
$.ajax({
url: url,
cache: false,
dataType: 'jsonp',
success: function (res) {
if (res != undefined) console.log(res);
},
error: function (res) {
if (res != undefined) console.log(res);
}
});

How to handle response of a POST request in jQuery

I am trying to POST some data to my ASP.Net MVC Web API controller and trying to get it back in the response. I have the following script for the post:
$('#recordUser').click(function () {
$.ajax({
type: 'POST',
url: 'api/RecordUser',
data: $("#recordUserForm").serialize(),
dataType: 'json',
success: function (useremail) {
console.log(useremail);
},
error: function (xhr, status, err) {
},
complete: function (xhr, status) {
if (status === 'error' || !xhr.responseText) {
alert("Error");
}
else {
var data = xhr.responseText;
alert(data);
//...
}
}
});
});
The problem with this script is that whenever I try to post the data, the jQuery comes back in "error" instead of "success".
I have made sure that there is no problem with my controller. I can get into my api method in debug mode whenever the request is made and can see that it is getting the data from the POST request and is returning it back. This controller is quite simple:
public class RecordUserController : ApiController
{
public RecordUserEmailDTO Post(RecordUserEmailDTO userEmail)
{
return userEmail;
}
}
I am not sure how I can get jQuery to print out any useful error messages. Currently when I try to debug the jQuery code using Chrome console it shows an empty xhr.responseText, nothing in "err" object and "status" set to "error" which as you see is not quite helpful.
One more thing that I have tried is to run the following code directly from the console:
$.ajax({
type: 'POST',
url: 'api/RecordUser',
data: {"Email":"email#address.com"},
dataType: 'json',
success: function (useremail) {
console.log(useremail);
},
error: function (xhr, status, err) {
console.log(xhr);
console.log(err);
console.log(status);
alert(err.Message);
},
complete: function (xhr, status) {
if (status === 'error' || !xhr.responseText) {
alert("Error");
}
else {
var data = xhr.responseText;
alert(data);
}
}
});
i.e. using the same script without actually clicking on the button and submitting the form. Surprisingly, this comes back with the right response and I can see my data printed out in console. For me this atleast means that my Web API controller is working fine but leaves me with no clue as to why it is not working on clicking the button or submitting the form and goes into "error" instead of "success".
I have failed to find any errors in my approach and would be glad if someone could help me in getting a response back when the form is posted.

As suggested by Alnitak, I was using complete callback along with success and error ones. Removing complete from my code fixed the issue.
Thanks to Alnitak.

jQuery AJAX and handling different dataTypes

I'm using ASP.Net MVC, but this applies to any framework.
I'm making an Ajax call to my server, which most of the time returns plain old HTML, however if there is an error, I'd like it to return a JSON object with a status message (and a few other things). There doesn't appear to be a way for the dataType option in the jQuery call to handle this well. By default it seems to parse everything as html, leading to a <div> being populated with "{ status: 'error', message: 'something bad happened'}".
[Edit] Ignoring the dataType object and letting jQuery figure out doesn't work either. It views the type of the result as a string and treats it as HTML.
One solution I came up with is to attempt to parse the result object as JSON. If that works we know it's a JSON object. If it throws an exception, it's HTML:
$.ajax({
data: {},
success: function(data, textStatus) {
try {
var errorObj = JSON.parse(data);
handleError(errorObj);
} catch(ex) {
$('#results').html(data);
}
},
dataType: 'html', // sometimes it is 'json' :-/
url: '/home/AjaxTest',
type: 'POST'
});
However, using an Exception in that way strikes me as pretty bad design (and unintuitive to say the least). Is there a better way? I thought of wrapping the entire response in a JSON object, but in this circumstance, I don't think that's an option.
Here's the solution that I got from Steve Willcock:
// ASP.NET MVC Action:
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult AjaxTest(int magic) {
try {
var someVal = GetValue();
return PartialView("DataPage", someVal);
} catch (Exception ex) {
this.HttpContext.Response.StatusCode = 500;
return Json(new { status = "Error", message = ex.Message });
}
}
// jQuery call:
$.ajax({
data: {},
success: function(data, textStatus) {
$('#results').html(data);
},
error: function() {
var errorObj = JSON.parse(XMLHttpRequest.responseText);
handleError(errorObj);
},
dataType: 'html',
url: '/home/AjaxTest',
type: 'POST'
});

For your JSON errors you could return a 500 status code from the server rather than a 200. Then the jquery client code can use the error: handler on the $.ajax function for error handling. On a 500 response you can parse the JSON error object from the responseText, on a 200 response you can just bung your HTML in a div as normal.

While Steve's idea is a good one, I'm adding this in for completeness.
It appears that if you specify a dataType of json but return HTML, jQuery handles it fine.
I tested this theory with the following code:
if($_GET['type'] == 'json') {
header('Content-type: application/json');
print '{"test":"hi"}';
exit;
} else {
header('Content-type: text/html');
print '<html><body><b>Test</b></body></html>';
exit;
}
The $_GET['type'] is just so I can control what to return while testing. In your situation you'd return one or the other depending on whether things went right or wrong. Past that, with this jQuery code:
$.ajax({
url: 'php.php?type=html', // return HTML in this test
dataType: 'json',
success: function(d) {
console.log(typeof d); // 'xml'
}
});
Even though we specified JSON as the dataType, jQuery (1.3.2) figures out that its not that.
$.ajax({
url: 'php.php?type=json',
dataType: 'json',
success: function(d) {
console.log(typeof d); // 'object'
}
});
So you could take advantage of this (as far as I know) undocumented behavior to do what you want.

But why not return only JSON regardless of the status (success or error) on the POST and the use a GET to display the results? It seems like a better approach if you ask me.

Or you could always return a JSON response, and have one parameter as the HTML content.
Something like:
{
"success" : true,
"errormessage" : "",
"html" : "<div>blah</div>",
}
I think you'd only have to escape double quotes in the html value, and the json parser would undo that for you.

I ran into this exact same issue with MVC/Ajax/JQuery and wanting to use multiple dataTypes (JSON and HTML). I have a AJAX request to uses an HTML dataType to return the data, but I attempt convert the data that comes back from the ajax request to a JSON object. I have a function like this that I call from my success callback:
_tryParseJson: function (data) {
var jsonObject;
try {
jsonObject = jQuery.parseJSON(data);
}
catch (err) {
}
return jsonObject;
}
I then assume that if the jsonObject and errorMessage property exist, that an error occured, otherwise an error did not occur.

I accomplished this by using the ajax success and error callbacks only. This way I can have mixed strings and json objects responses from the server.
Below I'm prepared to accept json, but if I get a status of "parsererror" (meaning jquery couldn't parse the incoming code as json since that's what I was expecting), but it got a request status of "OK" (200), then I handle the response as a string. Any thing other than a "parsererror" and "OK", I handle as an error.
$.ajax({
dataType: 'json',
url: '/ajax/test',
success: function (resp) {
// your response json object, see if status was set to error
if (resp.status == 'error') {
// log the detail error for the dev, and show the user a fail
console.log(resp);
$('#results').html('error occurred');
}
// you could handle other cases here
// or use a switch statement on the status value
},
error: function(request, status, error) {
// if json parse error and a 200 response, we expect this is our string
if(status == "parsererror" && request.statusText == "OK") {
$('#results').html(request.responseText);
} else {
// again an error, but now more detailed and not a parser error
// and we'll log for dev and show the user a fail
console.log(status + ": " + error.message);
$('#results').html('error occurred');
}
}
});