Prestashop: Pass data from js file to controller to custom page - ajax

Question

I'm having difficulty passing the value from my personal js to the controller and recovering it on the personal tpl page.
This module will serve to customize product after some selections and fields to fill out.
The selections pass from tabs to tabs.
The problem is that I can't get the value {$ var}
I have:
JS in root->modules->modulename->views->js->namejsfile.js
CONTROLLER in root->modules->modulename->controllers->front->controllername.php
VIEW in root->modules->modulename->views->templates->front->filename.tpl
in JS
$('#send').click(function(){
var ciao = 'cioaa';
var myUrl = prestashop.urls.base_url + 'index.php?fc=module&module=configuratore';
$.ajax({
type: 'get',
cache:false,
url: myUrl,
data: {
ajax: true,
datas:ciao,
action: 'fromAjax',
},
})
.done(function() {
console.log('Success!');
})
.fail(function() {
console.log('error');
});
});
in PHP
class ConfiguratoreTaskModuleFrontController extends ModuleFrontController
{
public function __construct()
{
parent::__construct();
}
public function init()
{
parent::init();
}
public function initContent()
{
parent::initContent();
$this->setTemplate('module:configuratore/views/templates/front/task.tpl');
}
$this->fromAjax();
}
public function fromAjax()
{
$mVar = Tools::getValue('datas');
return $this->context->smarty->assign(array('var'=>$mVar));
}
in TPL
{$var}

Answer 1

<?
public function fromAjax()
{
$mVar = Tools::getValue('datas');
$this->context->smarty->assign(array('var'=>$mVar));
$templateFile = 'module:configuratore/views/templates/front/task.tpl';
$html = $this->fetch($templateFile);
die($html); // pass to JS
}
in JS:
.done(function(html) {
console.log(html);
})