How can I print_r an array from controller while an ajax process? - ajax

Question

I am trying to debug my AJAX call to database.
But there is no way to see the data i am using. I have tried to do it inserting some Javascript:
I also tried to use print_r, but nothing happens.
Is there any way to see my variables? A developer tool for example, or any command i could use.
Thanks for your help.
function console_log( $data ){
echo '<script>';
echo 'console.log('. json_encode( $data ) .')';
echo '</script>';
}
This is my controller code:
public function searchEvents(){
$request = Request::createFromGlobals();
if($request->getMethod()=='POST') {
$value = $request->request->get('searchBox');
$em=$this->getDoctrine()->getManager();
$searchFor = $request->request->get('value');
$qb = $em->createQueryBuilder();
//$eventos = $em->getRepository('App:Evento')->findBy(array('title'=>'Invi Chuwi'));
$query = $em->createQuery('SELECT e FROM App:Evento e WHERE e.title LIKE :value');
$query->setParameter('value', '%'.$searchFor.'%');
$eventos = $query->getResult();
/*$qb->select('u')
->from('App:Evento','u')
->where(('u.title = '.$searchFor));
$query = $qb->getQuery();
$eventos = $query->getResult();*/
$response = [];
foreach($eventos as $evento){
array_unshift($response,[
$evento->getTitle(),
$evento->getFecha()
]);
print_r($response);
}
$respuesta = new JsonResponse();
$respuesta->setData(
array('response'=>'success',
'eventos'=>$response)
);
}
return $respuesta;
}
And my js code:
function searchForEvents(value){
$.ajax({
method:"POST",
data: value=2,
url:"{{ path('searchEvents') }}",
dataType:'json',
success: function(data){
//var results = JSON.parse(data.events);
alert(JSON.stringify(data, null, 4));
//putEvents(results);
}
})
}

Answer 1

I assume you use Symfony 4+ If this case you need to install Symfony Profiler and Var Dumper packages (https://symfony.com/doc/current/profiler.html - https://symfony.com/doc/current/components/var_dumper.html). When install that two bundle you need change print_r functions to dump function. After you do that profiler package record all your request. You can access profiler data to "_profiler" route (example: http://localhost:8000/_profiler/ or something like that).
Please notice that the browser will show you the direct link to profiler inside the headers of the request, here is an example:

Answer 2

The way you send your AJAX request is invalid. Change it to:
function searchForEvents(value){
$.ajax({
method:"POST",
data: {value: 2},
url:"{{ path('searchEvents') }}",
dataType:'json',
success: function(data){
//var results = JSON.parse(data.events);
alert(JSON.stringify(data, null, 4));
//putEvents(results);
}
})
}
This will still not pass searchbox, but hopefully this is enough to figure that out as well. If not, then please add more details.
As about debugging the data, you can always use the good old echo var_dump and see what it puts into your request response in the network tab of dev tools or you can do it the Symfony way, logging it into a file.

Answer 3

Not sure if I understand you question correctly, but AJAX requests have to be debugged separately using symfony developer toolbar or by peeking request in browsers dev tools → Network tab. You can also check var/log/dev.log