Hyperlink to an exterior URL retrieved from database using TWIG - symfony

Question

I'm using Symfony 2.0.19. I'm trying to create a hyperlink to an external URL, which is retrieved from a database.
I tried doing this
<td>{{dominio.url}}</td>
but the path I get is a relative path to the URL inside the base URL example "localhost/web/www.tralalalala.com" instead of just "www.tralalalala.com".
How do I do this?

Answer 1

Here's a concrete example of what Pierrickouw is suggesting:
Create a Twig extension or filter under src/Twig, and call it for example ExternalLinkFilter. Define the class as follows:
<?php
namespace AppBundle\Twig;
class ExternalLinkFilter extends \Twig_Extension
{
public function getFilters()
{
return array(
new \Twig_SimpleFilter('external_link', array($this, 'externalLinkFilter')),
);
}
/* source: http://stackoverflow.com/a/2762083/3924118 */
public function externalLinkFilter($url)
{
if (!preg_match("~^(?:f|ht)tps?://~i", $url)) {
$url = "http://" . $url;
}
return $url;
}
public function getName()
{
return 'external_link_filter';
}
}
?>
Now, you should register this class as a service in config/services.yml as follows:
services:
# other services
app.twig.external_link:
class: AppBundle\Twig\ExternalLinkFilter
public: false
tags:
- { name: twig.extension }
Now you can simply use the filter called external_link as you would use any Twig's default one, e.g.:
...
{{check.hostname}}
...

Answer 2

I suggest you to build your own Twig filter.
If your url aldready have http://, don't add it, otherwise, add it.
Check here for how-tos.

Answer 3

A symfony 5 version of nbro's answer will be:
(This will take care of all kind of url that is read from the db)
source: https://symfony.com/doc/current/templating/twig_extension.html
in src/Twig create the file
<?php
namespace App\Twig;
use Twig\Extension\AbstractExtension;
use Twig\TwigFilter;
class ExternalLinkFilter extends AbstractExtension
{
public function getFilters()
{
return array(
new TwigFilter('external_link', array($this, 'externalLinkFilter')),
);
}
/* source: http://stackoverflow.com/a/2762083/3924118 */
public function externalLinkFilter($url)
{
if (!preg_match("~^(?:f|ht)tps?://~i", $url)) {
$url = "http://" . $url;
}
return $url;
}
public function getName()
{
return 'external_link_filter';
}
}
?>
You don't need to register it as a service. Symfony 5 will notice the presence of that Twig extension
Use it in twig template as suggested by #nbro
{{check.hostname}}