How to make a filtering form for the collections page?

Question

MODX

I just started to learn MODX, googling only led to a solution using the paid mSearch plugin. Maybe there is something else? Maybe it is implemented by some other plugin?
Ideally, of course, understand how to process the get request from the form yourself and generate a page in accordance with it, but again, I just started learning and I would be very grateful if someone points in the right direction. Thanks in advance.

Answer 1

There is a good tagmanager snippet, it works with GER, ajax filtering, working with TV
If you know php, a snippet is created, any php code is written in it.
and process it the way you want.
The craziest way to call another snippet in a snippet, like getresources , and pass it
in MODx has a powerful API. for example getCollection,

$q = $modx->newQuery('modResource', array('id:>' => 0, 'template' => 3));
$res = $modx->getCollection('modResource', $q);
var_export($res);

there is an option to directly access the database through pdo gadgets, to the default site_content fields. with tv it is already more difficult to join 2 tables

$q = $modx->newQuery('modResource', array('id:>' => 0, 'template' => 3));
$q->select('id,pagetitle');
if ($q->prepare() && $q->stmt->execute()) {
    while ($row = $q->stmt->fetch(PDO::FETCH_ASSOC)) {
        var_export($row);
    }
}