AJAX POST JSON to PHP issue No DATA in PHP - php

Question

I am having trouble sending $_POST data via jQuery Ajax. I have read over everything I can find regarding the matter and still I am getting nowhere. I have even gone back to very basic data and still nothing, the JSON data has been validated using the JSON validate site. For the life of me I cannot echo/print_r/var_dump or get access to any data.
My JavaScript:
$('#updateJSON').click(function(){
var content = [{
"id": 21,
"children": [{
"id": 196
}, {
"id": 195
}, {
"id": 49
}, {
"id": 194
}]
}];
var someText = "someText";
$.ajax({
type: 'POST',
url: 'test.php',
data: {data: content},
cache: false,
success: function(){
alert("success");
console.log(content);
window.location = "test.php";
},
error:function(){
alert('ajax failed');
}
});
});
My PHP:
<?php
if(isset($_POST['data'])) {
$json = stripslashes($_POST['data']);
var_dump(json_decode($json, true));
} else {
echo "No Data";
}
?>
So I do get the alert("success"), and then get redirected to test.php
once at test.php I get the echo "No Data".
Thanks in advance for any help with this issue.

Answer 1

The reason is you are using window.location to redirect to the PHP file (without any post data) instead of posting the form on test.php.
You should either post the form without ajax on test.php.
Or use the response from test.php in your success function.
$('#updateJSON').click(function(){
var content = [{
"id": 21,
"children": [{
"id": 196
}, {
"id": 195
}, {
"id": 49
}, {
"id": 194
}]
}];
var someText = "someText";
$.ajax({
type: 'POST',
url: 'test.php',
data: {data: content},
cache: false,
success: function(response){
alert("success");
console.log(response);
//window.location = "test.php";
},
error:function(){
alert('ajax failed');
}
});

Answer 2

You are passing data as a string to ajax file. Please use JSON.stringify(conten) to pass data as a json format in ajax file.
use
data: {data: JSON.stringify(content)}
in place of
data: {data: content}

Answer 3

Use:
<?php
$postdata = file_get_contents("php://input");
$request = json_decode($postdata);
Then access each field as follows:
$field1 = #$request->field1Name;
$field2 = #$request->field2Name;
etc..
EDIT:
Well, the first part of the answer is still valid.
I've tried your code and slightly modified it on my machine, and i was able to access the whole data as you will see below:
Javascript: removed the square brackets from the outside of your JSON and removed the curly brackets from the 'data' part of the ajax since they are not necessary
as you can see, i've also added the "data" to the success function so i can debug the response from test.php better
$(document).ready(function(){
$('#updateJSON').click(function(){
var content = {
"id": 21,
"children": [{
"id": 196
}, {
"id": 195
}, {
"id": 49
}, {
"id": 194
}]
};
var someText = "someText";
$.ajax({
type: 'POST',
url: 'test.php',
data: JSON.stringify(content),
cache: false,
success: function(data){
alert(data);
console.log(content);
},
error:function(){
alert('ajax failed');
}
});
});
});
PHP:
<?php
$postdata = file_get_contents("php://input");
$request = json_decode($postdata);
$field1 = #$request->id;
echo $field1;
and $field1 is echoed as "21", the correct answer
You can apply this to your code and check also.

Answer 4

Thanks everyone for the help I have managed to figure it out with the help of each of you.
I needed to create in the test.php file a, $json = array(), and then populate the array, $json[] = json_decode($_POST['data']);
that then allowed me to place the contents in a JSON file.
here is the php code:
<?php
$json = array();
if($_POST['data']) {
$json[] = json_decode($_POST['data']);
file_put_contents("../JSON/test.json",json_encode($json));
} else {
echo "No Data";
}
?>
and as long as the file "JSON/test.json" exists then it will write the JSON passed from the JS.
I would like to note:
without the JSON.stringify(content); the data is NULL so thank you # Rahul Patel for making sure this was being applied.
the JSON data is valide according to the JSON validate site.
also just for keeps sake the JS code:
$('#updateJSON').click(function(){
var content = {
"id": 21,
"children": [{
"id": 196
}, {
"id": 195
}, {
"id": 49
}, {
"id": 194
}]
};
$.ajax({
type: 'POST',
url: 'test.php',
data: {data: JSON.stringify(content)},
cache: false,
success: function(){
alert("JSON Updated");
},
error:function(){
alert('ajax failed');
}
});
});