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Reorganize the for tag docs
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Fabien Potencier
+103
-86
@@ -50,92 +50,6 @@ The ``..`` operator can take any expression at both sides:
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If you need a step different from 1, you can use the ``range`` function
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instead.
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The ``loop`` variable
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---------------------
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Inside of a ``for`` loop block you can access some special variables:
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===================== ========================================================================
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Variable Description
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===================== ========================================================================
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``loop.index`` The current iteration of the loop. (1 indexed)
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``loop.index0`` The current iteration of the loop. (0 indexed)
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``loop.revindex`` The number of iterations from the end of the loop (1 indexed)
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``loop.revindex0`` The number of iterations from the end of the loop (0 indexed)
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``loop.first`` True if first iteration
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``loop.last`` True if last iteration
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``loop.length`` The number of items in the sequence
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``loop.parent`` The parent context
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``loop.cycle`` Cycle over a sequence of values
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``loop.changed`` True if previously called with a different value or if not called yet
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``loop.previous`` The value from the previous iteration (``null`` for the first iteration)
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``loop.next`` The value from the next iteration (``null`` for the last iteration)
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===================== ========================================================================
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.. code-block:: twig
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{% for user in users %}
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{{ loop.index }} - {{ user.username }}
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{% endfor %}
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Use ``loop.cycle`` to cycle among a list of values:
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.. code-block:: html+twig
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{% for row in rows %}
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<li class="{{ loop.cycle('odd', 'even') }}">{{ row }}</li>
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{% endfor %}
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Use ``loop.previous`` and ``loop.next`` to access the previous or next values:
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.. code-block:: twig
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{% for value in values %}
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{% if not loop.first and value > loop.previous %}
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The value just increased!
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{% endif %}
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{{ value }}
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{% if not loop.last and loop.next > value %}
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The value will increase even more!
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{% endif %}
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{% endfor %}
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``loop.previous`` is ``null`` when called at the first item, and ``loop.next``
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is ``null`` when called at the last item.
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Use ``loop.changed`` to check if the value has changed since the last call:
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.. code-block:: html+twig
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{% for entry in entries %}
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{% if loop.changed(entry.category) %}
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<h2>{{ entry.category }}</h2>
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{% endif %}
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<p>{{ entry.message }}</p>
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{% endfor %}
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.. note::
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When the underlying PHP iterator is not countable, the ``loop.length``,
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``loop.revindex``, and ``loop.revindex0`` variables are not available and a
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``RuntimeException`` is thrown if you try to use them.
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The ``else`` Clause
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-------------------
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If no iteration took place because the sequence was empty, you can render a
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replacement block by using ``else``:
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.. code-block:: html+twig
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<ul>
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{% for user in users %}
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<li>{{ user.username|e }}</li>
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{% else %}
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<li><em>no user found</em></li>
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{% endfor %}
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</ul>
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Iterating over Keys
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-------------------
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@@ -179,3 +93,106 @@ the :doc:`slice <../filters/slice>` filter:
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<li>{{ user.username|e }}</li>
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{% endfor %}
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</ul>
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The ``else`` Clause
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-------------------
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If no iteration took place because the sequence was empty, you can render a
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replacement block by using ``else``:
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.. code-block:: html+twig
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<ul>
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{% for user in users %}
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<li>{{ user.username|e }}</li>
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{% else %}
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<li><em>no user found</em></li>
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{% endfor %}
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</ul>
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The ``loop`` Object
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-------------------
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Inside of a ``for`` loop block, a ``loop`` object exposes some information
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about the current loop iteration.
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``loop`` Variables
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~~~~~~~~~~~~~~~~~~
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===================== ========================================================================
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Variable Description
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===================== ========================================================================
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``loop.index`` The current iteration of the loop (1 indexed)
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``loop.index0`` The current iteration of the loop (0 indexed)
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``loop.revindex``* The number of iterations from the end of the loop (1 indexed)
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``loop.revindex0``* The number of iterations from the end of the loop (0 indexed)
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``loop.first`` True if first iteration
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``loop.last`` True if last iteration
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``loop.length``* The number of items in the sequence
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``loop.parent`` The parent context
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``loop.previous`` The value from the previous iteration (``null`` for the first iteration)
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``loop.next`` The value from the next iteration (``null`` for the last iteration)
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===================== ========================================================================
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.. note::
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When the underlying PHP iterator is not countable, the ``loop.length``,
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``loop.revindex``, and ``loop.revindex0`` variables are not available and a
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``RuntimeException`` is thrown if you try to use them.
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Here is an example on how to use the ``index`` variable:
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.. code-block:: twig
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{% for user in users %}
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{{ loop.index }} - {{ user.username }}
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{% endfor %}
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Use ``loop.previous`` and ``loop.next`` to access the previous or next values:
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.. code-block:: twig
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{% for value in values %}
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{% if not loop.first and value > loop.previous %}
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The value just increased!
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{% endif %}
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{{ value }}
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{% if not loop.last and loop.next > value %}
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The value will increase even more!
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{% endif %}
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{% endfor %}
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``loop.previous`` is ``null`` when called at the first item, and ``loop.next``
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is ``null`` when called at the last item.
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``loop`` Functions
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~~~~~~~~~~~~~~~~~~
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The ``loop`` object also exposes some functions:
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===================== ========================================================================
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Function Description
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===================== ========================================================================
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``loop.cycle()`` Cycle over a sequence of values
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``loop.changed()`` True if previously called with a different value or if not called yet
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``loop()`` Allows to iterate over a nested sequence/mapping
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===================== ========================================================================
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Use ``loop.cycle()`` to cycle among a list of values:
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.. code-block:: html+twig
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{% for row in rows %}
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<li class="{{ loop.cycle('odd', 'even') }}">{{ row }}</li>
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{% endfor %}
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Use ``loop.changed()`` to check if the value has changed since the last call:
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.. code-block:: html+twig
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{% for entry in entries %}
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{% if loop.changed(entry.category) %}
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<h2>{{ entry.category }}</h2>
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{% endif %}
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<p>{{ entry.message }}</p>
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{% endfor %}
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