Validate checkbox not mapped to entity in a symfony2 form

Question

I add a non mapped field to a symfony2 form type:

$builder->add('terms','checkbox', array('mapped' => false,
        'constraints' => array(new NotBlank())));

But the NotBlank() constraint is not working! Only if I change the type from 'checkbox' to 'text' it is working as expected. So how can I validate a checkbox? Of course I tried with 'True()', 'EqualTo()' and 'Length(...)' constraints too. But without success. I also tried different POST values (1/0, true/false, on/off...) for the field.

What is the big difference between a checkbox field and a text field regarding form field validation in symfony2?

Thanx Stef

To get eyes on your question, you should tag it with the most popular tag that is relevant to your question - in this case, I would recommending replacing one of your tags, like the 'constraints' tag with 'PHP'. — Brionius
– Brionius, Commented Aug 11, 2013 at 23:49

Jasson Rojas · Accepted Answer · 2021-01-21 17:19:48Z

16

NotBlank validates string to be not empty. Try to use NotNull

IsTrue must also works.

Validates that a value is true. Specifically, this checks to see if the value is exactly true, exactly the integer 1, or exactly the string "1". This constraint can be applied to properties (e.g. a termsAccepted property on a registration model).

edited Jan 21, 2021 at 17:19

Jasson Rojas

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answered Aug 12, 2013 at 5:31

Alexey B.

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1 Comment

g.adam Over a year ago

True works for me to validate checkbox, thank you.

Yaroslavm · Accepted Answer · 2023-09-19 08:33:05Z

10

Updated answer for Symfony 3.0+:

use Symfony\Component\Form\Extension\Core\Type\CheckboxType;
use Symfony\Component\Validator\Constraints\IsTrue;

// ...
{
    $builder->add('terms', CheckboxType::class, array('constraints'=>new IsTrue(array('message'=>'Needs to be clicked')));
}

edited Sep 19, 2023 at 8:33

Yaroslavm

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answered Jul 12, 2016 at 20:54

Thomas Landauer

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