Passing JSON data from JavaScript using Ajax to PHP

Question

I have the following JS:

window.onload = function() {
'use strict';
var ajax = getXMLHttpRequestObject();

ajax.onreadystatechange = function() {
    if ( ajax.readyState == 4 ) {
        if ( (ajax.status >= 200 && ajax.status < 300) || (ajax.status == 304) ) {
            var data = JSON.parse(ajax.responseText);
            var file = '';
            file += 'Original: ' + data['org'].file + '<br>';
            file += 'Processed: ' + data['pre'].file + '<br>';
            document.getElementById('output').innerHTML = file; 
        } else {
            document.getElementById('output').innerHTML = 'Error: ' + ajax.statusText;
        }
    }
};

document.getElementById('btn').onclick = function() {
    ajax.open('POST', 'resources/test.json', true);
    ajax.setRequestHeader('Content-Type', 'application/json');
    ajax.send(null);
};
};

I would like to pass the data from

data['org'].file

and

data['pre'].file

to PHP and have it echo out the value using the POST method. Please no jQuery solutions this needs to be strictly JavaScript.

Something like this:

<?php $data = $_POST['the_data']; echo $data; ?>

Here is the JSON from test.json:

{
"org": {
    "file": "css/original.css"
},
"pre": {
    "file": "css/preprocessed.css"
}
}

Answer 1

If you want a PHP script to echo JSON data, it's as simple as this:

<?
    $json = file_get_contents('php://input');
    //...
    echo $json;
?>

To post it from Javascript, I reccomend reading this. There's a reason so many people use jQuery...

Answer 2

have a look on JSON Stringify you can use that to encode your data.

Then after you encoded you can send it wherever you need.