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if.rst	1.92 KB	-rw-r--r--
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index.rst	238 B	-rw-r--r--
macro.rst	2.61 KB	-rw-r--r--
sandbox.rst	764 B	-rw-r--r--
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with.rst	1.07 KB	-rw-r--r--

Code Editor : if.rst

``if``
======

The ``if`` statement in Twig is comparable with the if statements of PHP.

In the simplest form you can use it to test if an expression evaluates to
``true``:

.. code-block:: jinja

{% if online == false %}
 Our website is in maintenance mode. Please, come back later.
 {% endif %}

You can also test if an array is not empty:

.. code-block:: jinja

{% if users %}
 <ul>
 {% for user in users %}
 <li>{{ user.username|e }}</li>
 {% endfor %}
 </ul>
 {% endif %}

.. note::

If you want to test if the variable is defined, use ``if users is
    defined`` instead.

You can also use ``not`` to check for values that evaluate to ``false``:

.. code-block:: jinja

{% if not user.subscribed %}
 You are not subscribed to our mailing list.
 {% endif %}

For multiple conditions, ``and`` and ``or`` can be used:

.. code-block:: jinja

{% if temperature > 18 and temperature < 27 %}
 It's a nice day for a walk in the park.
 {% endif %}

For multiple branches ``elseif`` and ``else`` can be used like in PHP. You can
use more complex ``expressions`` there too:

.. code-block:: jinja

{% if kenny.sick %}
        Kenny is sick.
    {% elseif kenny.dead %}
        You killed Kenny! You bastard!!!
    {% else %}
        Kenny looks okay --- so far
    {% endif %}

.. note::

The rules to determine if an expression is ``true`` or ``false`` are the
    same as in PHP; here are the edge cases rules:

====================== ====================
    Value                  Boolean evaluation
    ====================== ====================
    empty string           false
    numeric zero           false
    whitespace-only string true
    empty array            false
    null                   false
    non-empty array        true
    object                 true
    ====================== ====================

${this.title}

Code Editor : if.rst