How to set a class attribute to a Symfony form input with an attribut from entity linked - forms

Question

I have in my form a "beds" attribute, an entity linked to another "bedroom".
I would like for each input to add a class with the id of the linked entity "bedroom".
$form->add('beds', EntityType::class, array(
'class' => 'DamiasResaBundle:Bed',
'query_builder' => function (EntityRepository $er) {
return $er->createQueryBuilder('b')
->orderBy('b.id', 'ASC');
},
'choice_label' => 'id',
'label' => 'lits ',
'multiple' => true,
'expanded' =>true,
'attr' => array(
'class' => function ($bed) {
return $bed->getBedroom()->getId();
}
),
))
I have two problems:
'attr' => array('class'=>'test) return a class attribut in the div containing the input, not a class attribut in the input.
This previous code does not work and returns:
An exception has been thrown during the rendering of a template ("Catchable Fatal Error: Object of class Closure could not be converted to string") in form_div_layout.html.twig at line 358.
Thank you for your help

Answer 1

I see you are using checkboxes.
Your code seems ok, and since you use query_builder, the values should be a Bed Entity. Note that attr is not mentioned in the EntityType documentation, and I think you need to use choice_attr instead.
Can you try this. I'm not sure if it will work or not:
$form->add('beds', EntityType::class, array(
'class' => 'DamiasResaBundle:Bed',
'query_builder' => function (EntityRepository $er) {
return $er->createQueryBuilder('b')
->orderBy('b.id', 'ASC');
},
'choice_label' => 'id',
'label' => 'lits ',
'multiple' => true,
'expanded' =>true,
'choice_attr' => function ($val) {
return ['class' => $val->getId()];
},
))
Let us know the results.

Answer 2

You need to customize form rendering
Previous code doesn't work because you're trying to pass Closure object instead of string value. attr array is used as field attributes, so it must contain only string values (or objects with __toString() method).

Answer 3

For EntityType it would rather look like this:
$form->add('beds', EntityType::class, array(
'class' => 'DamiasResaBundle:Bed',
'query_builder' => function (EntityRepository $er) {
return $er->createQueryBuilder('b')
->orderBy('b.id', 'ASC');
},
'choice_label' => 'id',
'label' => 'lits ',
'multiple' => true,
'expanded' =>true,
'choice_attr' => function (Bed $bed, $key, $index) {
return ['class' => $bed->getBedroom()->getId();];
},
))

Answer 4

Since choice_attr seems not to be working anymore, I am writing another solution. I wasn't able to set attribute (exactly "min") directly from formBuilder. I managed to add it with help of js. I simply searched element by ID given by formBuilder and added atribute.
Inspect your form in browser element inspector and find id.
<div id="form_deadLine">
<input type="date" id="form_deadLine_date" name="form[deadLine][date]" required="required" value="2020-02-20"/>
</div>
Id you wanna look for in my case is form_deadLine_date.
Then you wanna connect .js file to you twig template and write there simple script.
const form = document.getElementById('form_deadLine_date');
if(form){
form.setAttribute("min", "2020-01-02")
}
then my code looks like:
<div id="form_deadLine">
<input type="date" id="form_deadLine_date" name="form[deadLine][date]" required="required" value="2020-02-20"/>
</div>