How to pre-select a form radio item with Symfony 2? - forms

Question

I'm working on a language choice form:
$currentLocale = "en_US"; // This is indeed sent to the formType
$langs = array(
'fr_FR' => 'fr',
'en_US' => 'en'
);
$builder->add('language', 'language', array(
'choices' => $langs,
'expanded' => true,
'multiple' => false,
'required' => false,
'label' => false,
));
The HTML code looks like this (simplified):
<div id="languageForm_language">
<input type="radio" value="fr_FR">
<input type="radio" value="en_US">
</div>
How could I get the second item pre-selected, according to the $currentLocale value ?

Answer 1

In your $langs array you can specify key value pairs like this:
array(
0 => 'value1',
1 => 'value2'
)
Now, e.g. you want to preselect value2, you can set the data attribute to the key from value2:
$builder->add('language', 'choice', array(
'choices' => $langs,
'expanded' => true,
'multiple' => false,
'required' => false,
'label' => false,
'data' => 1
));
According to this, you can set your data attribute to your $currentLocale variable to preselect it. Your code should look like this:
$currentLocale = "en_US"; // This is indeed sent to the formType
$langs = array(
'fr_FR' => 'fr',
'en_US' => 'en'
);
$builder->add('language', 'choice', array(
'choices' => $langs,
'expanded' => true,
'multiple' => false,
'required' => false,
'label' => false,
'data' => $currentLocale
));
Note: the second parameter from the add() method should be choice not language.

Answer 2

If the form is used with a model object, just set the language on the object itself before passing it to the form:
$object->setLanguage($currentLocale);
$form = $this->createForm('some_form_type', $object);
Otherwise, set the data option to the default language key:
$builder->add('language', 'language', array(
'choices' => $langs,
'data' => $currentLocale,
// ...
));