8000 [Form][Form Choice] customize choice entry by gilles-g · Pull Request #17384 · symfony/symfony-docs · GitHub
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[Form][Form Choice] customize choice entry #17384

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Oct 26, 2022
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[Form][Form Choice] customize choice entry #17384

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39 changes: 39 additions & 0 deletions reference/forms/types/choice.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -323,3 +323,42 @@ Field Variables

It's significantly faster to use the :ref:`selectedchoice <form-twig-selectedchoice>`
test instead when using Twig.


Access data in a Form Choice
.............................

When you use an expanded ``ChoiceType`` and need to customize the children ``entry`` blocks,
the ``form.vars`` of entries (radio button or checkbox) may not be enough since each holds a
boolean value meaning whether a choice is selected or not.
To get the full list of choices data and values, you will need to access the ``choices`` variable
from their parent form (the ``ChoiceType`` itself) with ``form.parent.vars.choices``::

Given the advanced object example, each entry would have access to the following variables:

.. code-block:: html+twig

{# `true` or `false`, whether the current choice is selected as radio or checkbox #}
{{ form.vars.data }}

{# the current choice value (i.e a category name when `'choice_value' => 'name'` #}
{{ form.vars.value }}

{# a map of `ChoiceView` or `ChoiceGroupView` instances indexed by choice values or group names #}
{{ form.parent.vars.choices }}

So the Category's entity is inside ``form.parent.vars.choices[key].data``, because the parent knows all the choices.

.. code-block:: html+twig

{% block _form_categories_entry_widget %}
{% set entity = form.parent.vars.choices[form.vars.value].data %}

<tr>
<td>{{ form_widget(form) }}</td>
<td>{{ form.vars.label }}</td>
<td>
{{ entity.name }} | {{ entity.group }}
</td>
</tr>
{% endblock %}
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