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laravel ajax unexpected end of json input

Hello guys i am desperate i am not getting completly this syntax / concept of Ajax.
I have 2 forms on my page. Based on the value of the hidden field a certain logic in my controller will be executed. Its simple actually -- i thought. I am trying to pass an array from my ajax to my controller and then passing it back to my view. I know it doesnt make much sense. But i am trying to understand how that works. The first logic gets executed but the other one gets me this error:
jqXHR is : [object Object] textStatus is : parsererror errorThrown is : SyntaxError: Unexpected end of JSON input
Why is that ? Can you guys please give me an advice.
Update
I tried not to put the whole code and just reduce it to the main question. But since it caused confusion of the rootcause i will show the whole code of the parts which might be relevant. I edited the question to the below.
BLADE
<center>
<div class="col-md-12">
<h3>xlsx, xls, ods, csv to Text</h3>
<form id="xlsForm" enctype="multipart/form-data">
#csrf
<input type="file" name="excelfile" />
<input name ="loadSubmit" id="loadSubmit" type="submit"/>
<input type ="hidden" name="load" value="0">
</form>
</div>
</center>
<div class ="row">
<div class ="col-md-3">
<div class="container mt-5">
<h2 id="words" class="mb-4">Skills found</h2>
</div>
<form id="xlsFormUpdate" enctype="multipart/form-data">
<input type ="hidden" name="load" value="1">
<div id="inner">
</div>
<input name ="updateSubmit" id="updateSubmit" type="submit"/>
</form>
</div>
<div class ="col-md-9">
#include('layouts.partials.datatable')
</div>
</div>
Controller:
if ($request->input('load') == '0') {
//some code -- this works fine
return response()->json($data); //This data can be send - no problem
} elseif (($request->input('load') == '1')) {
$data = $request->post('checkbox_array');
return response->json($data); // i tried json_encode too .. not working.
}
Jquery code
$(document).ready(function(){
$('#xlsForm').submit(function uploadFile(event){
event.preventDefault();
$.ajaxSetup({
headers: {
'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
}
});
$.ajax({
url: "{{route('ExcelToArray')}}",
method: 'POST',
data: new FormData(this),
dataType: 'JSON',
contentType: false,
cache: false,
processData: false,
success:function (response) {
$("#inner").empty();
$.each(response,function(index,value){
$("#inner").append
('<div class="row">' +
'<div class="col-xs-2">'+
'<input type="checkbox" class="'+value+'" value="'+value+'" name="checkbox[]" checked > <label style="font-weight: bold" for="skillChoice_'+index+'">'+value+' </label>' +
'</div>'+
'<div class="col-xs-1">'+
'<input class="'+value+'" type="number" name="weight[]" min="1" max="3" value="1"> '+
'</div>'+
'</div>');
});
}
});
});
$('#xlsFormUpdate').submit(function uploadFile(event) {
event.preventDefault();
var checkbox_array = [];
$('input[type=checkbox]').each(function (index,value) {
if (this.checked)
{
checkbox_array.push(1);
}
else {
checkbox_array.push(0);
}
});
let checkbox_s = JSON.stringify(checkbox_array)
$.ajaxSetup({
headers: {
'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
}
});
$.ajax({
url: "{{route('ExcelToArray')}}",
method: "POST",
data: {checkbox_array:checkbox_s},
dataType: 'JSON',
contentType: false,
cache: false,
processData: false,
success: function (response) {
alert('The Response is ' + response);
},
error: function (jqXHR, textStatus, errorThrown) {
alert('jqXHR is : ' + jqXHR
+ 'textStatus is : ' + textStatus
+ ' errorThrown is : ' + errorThrown);
},
})
});
});

When using ajax submit event to send data to controller, the data in the field data: {checkbox_array:checkbox_s}, will be send to the controller. Since the input field load was never sent, the elseif (($request->input('load') == '1')) clause was never true and the controller was never going into that section and was never returning the right response. The data had to be changed like this var my_datas JSON.stringify({mydata:checkbox_array, load: "1"}); and then in ajax the data could be send like data:my_datas. In controller the field load can then be processed.

How to properly get form data with JQuery and formData

I am trying to upload some form data using ajax and php but for some reason my data is not being catch or passed.
Here is what I have:
form.html ( basic form with 3 text inputs and 1 file)
<form class="form" id="superform" action="nada.php" method="post" enctype="multipart/form-data">
<div class="form-group">
<label for="tituloQuiz">Resultado:</label>
<input type="text" class="form-control resultado" id="titulo" name="titulo" placeholder="Ex: Paris">
</div>
<div class="form-group">
<label for="desc">Descrição do Site:</label>
<textarea class="form-control" id="desc" name="descricao" placeholder="Ex:"></textarea>
</div>
<div class="form-group">
<label for="desc">OG FB DESC:</label>
<textarea class="form-control" id="facedes" name="descricao" placeholder="facebook description"></textarea>
</div>
<div class="form-group">
<label for="imggrande">Imagem</label>
<input type="file" id="imggrande" name="imgres">
<p class="help-block">Imagem usada na página de resultado e Facebook 600 x 400.</p>
</div>
<button type="button" class="btn btn-primary btn-lg addres">Adicionar Resultado</button>
<button type="button" class="btn btn-danger btn-lg">Próxima Etapa</button>
</form>
And here is the JS that makes the ajax call:
myjs.js
$("document").ready(function(){
$('.row').on('click','.addres',function(){
console.log('Click Detectado');
var formulario = $('#superform');
var formData = new FormData(formulario);
$.ajax({
type: "POST",
url: "addres.php",
data: formData,
async: false,
success: function(data) {
console.log('Funcionou');
},
error: function(data) {
console.log('Erro no formulario');
},
cache: false,
contetType: false,
processData: false
});
});
});
Nothing is being passed and the POST call is empty (See screenshots below).
**addres.php**
<?php
var_dump($_FILES);
var_dump($_POST);
?>

$.ajax({
url: 'address.php',
type: 'POST',
data: new FormData($('#superform')[0]), // The form with the file inputs.
processData: false, // Using FormData, no need to process data.
contentType:false
}).done(function(){
console.log("Success: Files sent!");
}).fail(function(){
console.log("An error occurred, the files couldn't be sent!");
});
When one sets the contentType option to false, it forces jQuery not to add a Content-Type header, otherwise, the boundary string will be missing from it. Also, when submitting files via multi-part/form one must leave the processData flag set to false, otherwise, jQuery will try to convert your FormData into a string, which will fail.
read from php using
$_FILES['file-0']
(There is only one file, file-0, unless you specified the multiple attribute on your file input, in which case, the numbers will increment with each file.)
Additional info:
See for yourself the difference of how your formData is passed to your php page by using console.log().
var formData = new FormData($('#superform')[0]);
console.log(formData);
var formDataSerialized = $('#superform').serialize();
console.log(formDataSerialized);
Hope this helps.
extra information read this upload files asynchronously
Note : formData doesn't work in IE 9

You can use .serializeArray() to get the data in array format and then convert it into an object. like this:
function getFormData(formId) {
let formData = {};
let inputs = $('#'+formId).serializeArray();
$.each(inputs, function (i, input) {
formData[input.name] = input.value;
});
return formData;
}

AJAX cannot return Json data

I'm trying to post a piece of Json data to AJAX and get a "upvote_message" in return. However, the "upvote_message" is returned as undefined.
Code:
<div class="media">
<div class="media-body">
<p align="right">
<span href="javascript:;" rel="1" class="upvote">Text to be replaced</span>
</p>
</div>
</div>
JS:
<script type="text/javascript">
$(function(){
$('.media .media-body .upvote').click(function(){
var this_a = $(this);
var comment_id = $(this).closest('span').attr('rel');
$.ajax({
type:"POST",
url: base_url + "/upvote",
data:{comment_id : comment_id},
dataType: "json",
success: function(data,status){
if(data.state == 'succ')
{
this_a.html(upvote_msg);
}
else
{
this_a.html(upvote_msg);
}
}
});
});
});
</script>
PHP
public function upvote (){
$comment_id = $this->input->post('comment_id');
if($comment_id==5){
echo json_encode(array('state' => 'succ','upvote_msg'=>'haha'));
}
else{
echo json_encode(array('state' => 'fail','upvote_msg'=>'bam'));
}
exit();
}
}
The PHP and AJAX's write-into part works fine. Data is also registered in database.
The issue is that the 'upvote_msg' is shown as "undefined" when being returned to the Javascript.
How to fix this? Many thanks,

upvote_msg is a property of the data object so it should be data.upvote_msg

To get upvote_msg value you have to use
data.upvote_msg or data["upvote_msg"]

AJAX pass data to PHP

I've been searching this forum, but I had no good result. I have this HTML:
<form method="post" id="postform">
<input type="text" name="message" id="message" placeholder='Say "Hello!"' class="mymessage" maxlength="255"/>
<br />
<input id="submit" type="button" value="Send"/>
</form>
PHP:
<?php
include ('connect.php');
session_start();
if (isset($_POST['message'])){
mysql_query("INSERT INTO messages VALUES ('','".$_POST['message']."','".$_SESSION['user']."')");
}
?>
And jQuery:
$('#submit').click(
function(){
var message = $('#message').val();
$.ajax({
url: post.php,
type:'POST',
data: {"message":message}
});
});
I need to pass #message content to PHP without refreshig the page. This is what I've made, but it's not working.

Check your syntax:
Wrap url with quotes '
Remove single quotes around 'message' variable
$.ajax({
url: 'post.php',
type: 'POST',
data: {message : message}
}).done(function( msg ) {
alert( "Data Saved: " + msg );
});
See the first example of $.ajax() at the bottom of its documentation page.

I need to pass #message content to PHP without refreshig the page.
Handle form submit instead:
$("#postform").submit(function(){
var message = $('#message').val();
$.ajax({
url: 'post.php',
type:'POST',
data: {message:message}
}).done(function( data) {
// handle response from the server in case of success.
});
return false; //to prevent submitting and refreshing the page.
});

JSON response opens as a file, but I can't access it with JavaScript

In the code below I make a POST request to a servlet that replies in this way:
response.setContentType("application/json");
json = "{success:true,sessionUid:\""+sessionUid+"\"}";
response.getWriter().write(json);
So Firefox opens it like a file and I can see it's ok. Here you have the JSON:
{success:true,sessionUid:"D07WC15R7LFRFRGPF4P5"}
The problem is that I can't inspect the JSON object. It seems not to exist inside my callback function (also using Firebug). Take a look to the code and alerts.
<html>
<head>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.5.1.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$("#loginForm").submit(function(response){
alert("response="+response); //output: "response=[object Object]"
var obj = jQuery.parseJSON(response);
alert("obj.sessionUid="+obj.sessionUid); //doesn't work, Firebug says "obj is null"
if (response.success == true){ //never true
document.location.href = 'http://localhost:8080/QuoteroClient/logged.jsp';
}else{
alert("Something went wrong in the login process.");
}
return false;
});
});
</script>
</head>
<body>
<form id="loginForm" action="http://localhost:8080/QuoteroClient/Main?servlet=Security" method="post">
<fieldset><legend>Login to Quotero:</legend>
<label>Action:</label><input type="text" name="action" value="login"/><br />
<label>Username:</label><input type="text" name="login-quotero" value="admin"/><br />
<label>Password:</label><input type="text" name="password-quotero" value="admin" /><br />
<label>Domain:</label><input type="text" name="combo-domain" value="Quotero" /><br />
</fieldset>
<input type="submit" value="Submit" />
</form>
</body>
</html>
EDIT: I also tried to do the same with an AJAX request, wothout success:
$("#ajaxSubmit").click(function () {
$.ajax({
type: "GET", //GET or POST is the same for this servlet
url: "http://localhost:8080/QuoteroClient/Main?servlet=Security&action=login&login-quotero=admin&password-quotero=admin&combo-domain=Quotero",
dataType: "json",
success: function (response) {
alert("response=" + response);
var obj = jQuery.parseJSON("" + response);
alert("obj.sessionUid=" + obj.sessionUid);
if (response.success == true) {
document.location.href = contextPath + 'http://localhost:8080/QuoteroClient/logged.jsp';
} else {
alert("Something went wrong in the login process.");
}
}
});
return false;
});

This is not valid JSON:
{success:true,sessionUid:"D07WC15R7LFRFRGPF4P5"}
This is valid JSON:
{"success":true,"sessionUid":"D07WC15R7LFRFRGPF4P5"}
In JSON the keys must always be quoted. See DEMO.

I think you have mixed up ajax with submit. submit is just simply an event, when form is submitted do the following. then you can
$("#loginForm").submit(function(){
var post_data = $(this).serialize();
$.ajax({
url: '',//url of the php file that handles the forms
type: 'GET',
dataType:'json',
data:post_data,//this are the query strings, e.g. ?q=blabla&s=blabla
success:function (data){//if page was 200 or successfully loaded
alert(data.sessionUid);
// do what ever you wish with the data here
},
error: function (){
alert('Page failed to load');
}
})
return false;
});