How to set default value for form field in Symfony2? – Symfony

->add('myfield', 'text', array(
'label' => 'Field',
'empty_data' => 'Default value'
))

The Solutions:

Solution 1: using `empty_data`

Can be used easily during the creation with:

->add('myfield', 'text', array(
     'label' => 'Field',
     'empty_data' => 'Default value'
))

Solution: Set Default Value for Text Form Field

In Symfony2, you can set a default value for text form fields using the empty_data option. For instance:

$builder->add('myField', 'number', [
    'empty_data' => 'Default value'
])

Solution 3: Set Data before build form

In the constructors / service, you know if you have a new entity or if it was populated from the db. It’s plausible therefore to call set data on the different fields when you grab a new entity. E.g.
                                           
if( ! $entity->isFromDB() ) {
$entity->setBar('default');
$entity->setDate( date('Y-m-d');
…
}
$form = $this->createForm(…)

Solution 4: Set Default Value for Entity-Related Form Field

When using Symfony2 forms that relate to an entity, you can set a default value for a text form field as follows:

public function buildForm(FormBuilderInterface $builder, array $options) {
    $builder
    ...
    ->add(
        'myField',
        'text',
        array(
            'data' => isset($options['data']) ? $options['data']->getMyField() : 'my default value'
        )
    );
}

By setting the ‘data’ option, you can specify the default value. If the form is bound to an entity, the value will be retrieved from the entity. Otherwise, the default value will be used.

Solution 5: Set Default Value for Form Field Using FormBuilder

FormBuilder offers a convenient way to set default values for form fields using its setData() method.

For example, to set a default value for a text field named name, you can use the following code:

$builder->add('name', 'text', array(
    'data' => 'John Doe',
));

By passing the desired default value as the data parameter, you can pre-populate the field with the specified value.