How AJAX calls work with TWIG

Question

I am trying to understand how Twig can load a template through AJAX. From their website, it is clear how to load a template (http://twig.sensiolabs.org/doc/api.html)

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Answer 1

There are several ways to accomplish that :

1) Separate your index.html in several files like index.html and content.html. Then use include function in index.html to include content.html.

Example :

if(isAjaxRequest()) //try to find the right function here
   echo $twig->render('content.html', array('the' => 'variables', 'go' => 'here'))
else
   echo $twig->render('index.html', array('the' => 'variables', 'go' => 'here'));

Edit : If you do your ajax request with jQuery for example :

$.get('yoururl', function(data) {
  $('#divtoremplace').html(data);
});

2) Use the request.ajax boolean in your index.html

{% if request.ajax == false %}
My header,  not reloaded with ajax
{% endif %}

My content, reloaded with ajax

{% if request.ajax == false %}
Other content,  not reloaded with ajax
{% endif %}

Not sure about the second one, but this should do the trick accordind to the documentation. The best way is the first solution, separate your code.