Develop Reference

How to assign javascript value to php variable without using cookie

I am recieving data form controller in ajax. Then I should assign it to php variable but without using cookies. How to do it?
My code:
$.ajax({
url: '/controller/action',
type: 'post',
data: {
id: id,
},
success: function(data){
if (data) {
//here I should assign data to php variable
}
if (!data) {
console.log('no data');
}
}
});

try using this demo code
<script>
if (data) {
var a =data;
<?php $abc = "<script>document.write(a)</script>"?>
}
if (!data) {
console.log('no data');
}
</script>
<?php
echo $abc;
?>

you can create a link with JavaScript that includes a GET variable. ones clicked php gets involved
code:
http://example.org/index.php?q1=blablabla
Php code:
if(isset($_GET['q1']) {$ff = $_GET['q1']}

How to get Variable in php when passing through javascript?

I am passing my variable through an AJAX request in javascript. How to assign this the value of this variable to a new variable in the tabs.php file?
JS code
var build = {
m_count : (document.getElementById('count').value),
}
$.ajax({
data: build,
type: "POST",
url: "tabs.php",});
success: function(data) {
console.log(data);
}
});
Output of console is nothing.

You don't need to assign it. Your value will be accessible on tabs.php by the _POST array as it $_POST['m_count'].
I also strongly suggest you to test if the array variable m_count is set to avoid eventual php error when m_count is missing by doing the following:
if (isset($_POST['m_count']))
{
# If possible set the content type header to json app.
# header('Content-Type: application/json');
$message = "m_count value is equal to: " . $_POST['m_count'];
echo json_encode([ "message" => $message ]);
}
Also you you have an extra }); before the success function in your javascript.
var build = {
m_count : document.getElementById('count').value,
}
$.ajax({
data: build,
type: "POST",
url: "tabs.php",
success: function(data) {
console.log(data);
},
});

ajax - sending data as json to php server and receiving response

I'm trying to grasp more than I should at once.
Let's say I have 2 inputs and a button, and on button click I want to create a json containing the data from those inputs and send it to the server.
I think this should do it, but I might be wrong as I've seen a lot of different (poorly explained) methods of doing something similar.
var Item = function(First, Second) {
return {
FirstPart : First.val(),
SecondPart : Second.val(),
};
};
$(document).ready(function(){
$("#send_item").click(function() {
var form = $("#add_item");
if (form) {
item = Item($("#first"), $("#second"));
$.ajax ({
type: "POST",
url: "post.php",
data: { 'test' : item },
success: function(result) {
console.log(result);
}
});
}
});
});
In PHP I have
class ClientData
{
public $First;
public $Second;
public function __construct($F, $S)
{
$this->First = F;
$this->Second = S;
}
}
if (isset($_POST['test']))
{
// do stuff, get an object of type ClientData
}
The problem is that $_POST['test'] appears to be an array (if I pass it to json_decode I get an error that says it is an array and if I iterate it using foreach I get the values that I expect to see).
Is that ajax call correct? Is there something else I should do in the PHP bit?

You should specify a content type of json and use JSON.stringify() to format the data payload.
$.ajax ({
type: "POST",
url: "post.php",
data: JSON.stringify({ test: item }),
contentType: "application/json; charset=utf-8",
success: function(result) {
console.log(result);
}
});

When sending an AJAX request you need to send valid JSON. You can send an array, but you need form valid JSON before you send your data to the server. So in your JavaScript code form valid JSON and send that data to your endpoint.
In your case the test key holds a value containing a JavaScript object with two attributes. JSON is key value coding in string format, your PHP script does not not how to handle JavaScript (jQuery) objects.
https://jsfiddle.net/s1hkkws1/15/
This should help out.

For sending raw form data:
js part:
$.ajax ({
type: "POST",
url: "post.php",
data: item ,
success: function(result) {
console.log(result);
}
});
php part:
..
if (isset($_POST['FirstPart']) && isset($_POST['SecondPart']))
{
$fpart = $_POST['FirstPart'];
$spart = $_POST['SecondPart'];
$obj = new ClientData($fpart, $spart);
}
...
For sending json string:
js part:
$.ajax ({
type: "POST",
url: "post.php",
data: {'test': JSON.stringify(item)},
success: function(result) {
console.log(result);
}
});
php part:
..
if (isset($_POST['test']))
{
$json_data = $_POST['test'];
$json_arr = json_decode($json_data, true);
$fpart = $json_arr['FirstPart'];
$spart = $json_arr['SecondPart'];
$obj = new ClientData($fpart, $spart);
}
...

Try send in ajax:
data: { 'test': JSON.stringify(item) },
instead:
data: { 'test' : item },

retrieve data using json and jquery ajax call no work

I'm triyng to retrieve JSON format data using $.ajax method of jquery from a php page, I get this error parseerror when the code runs, but if I see the response of the server with firebug it's Ok.
Here's my script code:
$.ajax({
url: "php/selectedObjectRequest.php",
type: "POST",
dataType: 'json',
data: {},
success: function(data) {
var prova = jQuery.parseJSON(data);
alert(prova.museum);
},
error: function(jqXHR,textStatus,errorThrown) {
alert(textStatus);
}
});
And that's my server side code:
$arrayToEncode = array(
'museum' => 'bellearti',
'atwork' => 'davide',
'beaconCode' => '78888',
'qrCode' => '2252222'
);
echo json_encode($arrayToEncode);
How I can solve?
solved:
My error was an echo to test before
echo json_encode($arrayToEncode);
pay attention.

The parameter data in your success handler will be preprocessed because you told jQuery that the dataType was JSON. You should be able to just use data.museum. To make sure, console.log(data); to see what it is.

the answer is:
change prova.museum to data.museum
$.ajax({
url: "php/selectedObjectRequest.php",
type: "POST",
dataType: 'json',
data: {},
success: function(data) {
alert(data.museum); // add data.museum instant of prova.museum
},
error: function(jqXHR,textStatus,errorThrown) {
alert(textStatus);
}
});

FIDDLE
Change the format
$arrayToEncode[] = array(
'museum' => 'bellearti',
'atwork' => 'davide',
'beaconCode' => '78888',
'qrCode' => '2252222');
echo json_encode($arrayToEncode, JSON_UNESCAPED_UNICODE);
So that you can call the return value like
for (var j = 0; j < data.length; j++) {
console.log(data[j].museum);
console.log(data[j].atwork);
console.log(data[j].beaconCode);
console.log(data[j].qrCode);
}

Try using this:
var parsed = JSON.parse(data);
This usually works for me.

$_POST empty after ajax post called

So the purpose of me using this ajax post is to use some JS variables in a wordpress loop, so I can call a custom loop depending on what the variables are in the ajax post.
Below is the ajax call.
$('.collection-more').click(function() {
$.ajax({
type: 'post',
url: 'http://tmet.dev/wp-content/themes/muban-trust/single-collection.php',
data: { "test" : "hello" },
success: function( data ) {
console.log( data );
}
});
})
Currently I'm sending hard-coded data.
In my single-collection.php page:
<?php
print_r($_POST);
if(isset($POST['filters[Artist]']))
{
$filters_obj = $_POST['filters[Artist]'];
$filters_array = json_decode($filters_obj, TRUE);
for($i = 0; $i < sizeof($filters_array); $i++)
{
echo '<p>h'.$obj->name.'</p>';
}
}
?>
I'm using the print_r just to debug the problem, currently it returns:
Array()
The problem is that I cannot access the Json object called "test" within the single-collection.php
How do I access it?
Thanks in advance!
EDIT: Screenshot of firebug

From ajax to php :
this is the conventional way
var payload = {
smth1: "name",
smth2: "age"
};
and then when calling ajax
$.ajax({
url: "somephp.php",
type: 'POST',
data: payload,
dataType: 'json',
crossDomain: true
})
From phpPost to javascript:
right way getting the post parameters:
$fields = $_POST['fields'];
$usernameGiven = $fields['smth1'];
$passwordGiven = $fields['smth2'];
and when returning smthn to javascript
$result = array(
"something" => "something",
"something2" => $something2
);
echo json_encode($result);

Use $_POST['test'] to access the test parameter. Your print_r() shows that it is filled in correctly.
Your PHP code is accessing $_POST['filters[Artist]'] but there is no such parameter in the Javascript. If you pass:
data: { 'filters[Artist]': somevalue }
you can access it in PHP as $_POST['filters']['Artist'].