Modify twig variable through js without reloading page

Question

I have an array of objects which are rendered through for loop in twig template. I want to apply a filter-like mechanism where after selecting a category from a filter, list of elements in twig would update without refreshing a page and contain elements only from chosen category.

Until now I managed to pass chosen category value through ajax to Symfony controller, parse it, encode to JS and send it as a response and fetch it via ajax.

Here's some code:

//variable passed to twig
        return $this->render('@Ad/ad_list.html.twig', [
            'adList' => $adList,
        ]);

//An ajax call
$.ajax({
   url : $form.attr('action'),
   type: "POST",
   data : filters,
   complete: function(html) {
        console.log(html['responseJSON'])
   }
});

//creating a response
$response = JsonResponse::fromJsonString($jsonContent);
$response->prepare($request);
$response->send();

{% for ad in adList|slice(0, 9) %}
    ...
{% endfor %}

Is it possible to update passed variable ($adList) to twig via JS, so it would render elements from response?

Answer 1

Thanks to brombeer and DarkBee help I achieved my goal. I did it by:

1. Creating new template which holds list of elements,
2. Rendering this new template in main template and passing there updated value

main template:

<section>
    {% include '@Ad/ad_list_container.html.twig' %}
</section>

ad_list_container template:

<div id="ad-list">
   {% for ad in adList %}
       ...
   {% endfor %}
</div>

ajax call:

$.ajax({
    url : $form.attr('action'),
    type: "POST",
    data : filters,
    success: function(response) {
        $('#ad-list').html(response);
    }
});

php controller:

return $this->render('@Ad/ad_list_container.html.twig', [
   'adList' => $adList
]);