How to render a checkbox that is checked by default with the symfony2 Form Builder?

You can also just set the attr attribute in the form builder buildForm method:

$builder->add('isPublic', CheckboxType::class, array(    'attr' => array('checked'   => 'checked'),));

checkbox symfony formbuilder

In Symfony >= 2.3 "property_path" became "mapped".

So:

$builder->add('checkboxName', 'checkbox', array('mapped' => false,    'label' => 'customLabel',    'data' => true, // Default checked));

checkbox symfony formbuilder

You would simply set the value in your model or entity to true and than pass it to the FormBuilder then it should be checked.

If you have a look at the first example in the documentation:

A new task is created, then setTask is executed and this task is added to the FormBuilder. If you do the same thing with your checkbox

$object->setCheckboxValue(true);

and pass the object you should see the checkbox checked.

If it's not working as expected, please get back with some sample code reproducing the error.

CodeHunter