Александр Туниеков

$message = 'Access denied action.php';
    echo json_encode(
            ['success' => false,
            'message' => $message,]
            );
    return;

<script>
$(document).on('change','.autosave',function(){ 
    $.post('assets/components/autosave/action.php', 
    { product_id: $(this).data('product_id'), price: $(this).val() })
      .done(function(data) { 
        alert("Data Loaded: " + data);
        console.log($.post);
      });
});
</script>

if($product = $modx->getObject('msProduct',(int)$_POST['product_id']){

if($product = $modx->getObject('msProduct',(int)$_POST['product_id'])){

error_reporting(E_ALL);
ini_set('display_errors', 1);

<input type="number" class="autosave" data-product_id="[[+id]]" value="[[+price]]"/>

<script>
$(function() {
    $(document).on('change','.autosave',function(){
        $.post( "/assets/components/autosave/action.php", 
        { product_id: $(this).data('product_id'), value: $(this).val() })
          .done(function( data ) {
            alert( "Data Loaded: " + data );
          });
    });
});
</script>

<?php
define('MODX_API_MODE', true);
require_once dirname(dirname(dirname(dirname(__FILE__)))) . '/index.php';

$modx->getService('error', 'error.modError');
$modx->setLogLevel(modX::LOG_LEVEL_ERROR);
$modx->setLogTarget('FILE');

if (!$modx->user->hasSessionContext('mgr')){
    echo 'Access denied';
    exit;
}

if((int)$_POST['product_id'] > 0){
    if($product = $modx->getObject('msProduct',(int)$_POST['product_id']){
        $product->set('price', $_POST['price']);
        if($product->save()) echo 'success';
    }
}