I'm new to symfony2 and I'm looking for solution to create an event that render a twig file.
Assume we have a base template
<!DOCTYPE html>
<html>
<head>
{% block meta %}{% endblock %}
<title>{% block title %}Welcome!{% endblock %}</title>
{% block stylesheets %}{% endblock %}
</head>
<body data-cachetime="{{ cacheTimeStamp() }}">
{% block header %}{% endblock %}
<div id="content">
<div class="container">
{% block content %}{% endblock %}
</div>
</div>
{% block footer %}{% endblock %}
{% block version %}{% endblock %}
{% block javascripts %}{% endblock %}
{% block trackers %}{% endblock %}
</body>
</html>
As you can see, I've a "version" block. I've created an VersionBundle which read the version from a file. The version twig template
{% block version %}
<div id="version"><p>Version: {{ versionString() }}</p></div>
{% endblock %}
calls an "ViewHelper" (i came from Zend ;-)) which calls the function from VersionBundle. But now the tricky part: The VerionBundle is only registered for 'dev' and 'test' Environment in the AppKernel. Thats why i create the 'version' block instead of calling the ViewHelper directly in the base twig file.
But i don't know how to create an event to render the version twig template first so the data will passed to the base twig.
I would maybe change the way you try to do it, using more Symfony features and avoiding defining Zend like "helpers". It's a good rule of thumb to keep Twig as minimal as it can be, just rendering view from data the templates receive.
First, define the version variable in parameters_dev.yml and parameters_test.yml files (in app/config). Example:
parameters:
version: 32
Define it as version: ~ in parameters.yml.
Make this variable available in all Twig templates in the app/config/config.yml file:
twig:
globals:
version: %version%
Then, in your version block definition, do the following:
{% block version %}
{% if version is not null %}
<div id="version"><p>Version: {{ version }}</p></div>
{% endif %}
{% endblock %}
Hope it helps!