2018-03-21 08:48
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表格事件中的Symfony 3.4 Ajax

In my project, the form allow user select a Map in a SelectBox. When Map Selectbox change, the options in GroupLayer Selectbox also change depend on which Map is selected. I see exactly Symfony document for my case in: How to Dynamically Modify Forms Using Form Events Howerver, in example code:

$formModifier = function (FormInterface $form, Sport $sport = null) {
        $positions = null === $sport ? array() : $sport->getAvailablePositions();

        $form->add('position', EntityType::class, array(
            'class' => 'App\Entity\Position',
            'placeholder' => '',
            'choices' => $positions,

I don't know where the getAvailablePositions() function should be and what is the returning of this function?. I think this function will be placed in Sport Entity. Is that right, in Sport Entity, could I query the Position Entity with Doctrine ORM queryBuilder?

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