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POSymfony adding EventListener in a closure and getting NULL
 

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  1. POSymfony adding EventListener in a closure and getting NULL
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    <p>I'm getting error "Call to a member function getAgent() on a non-object".</p> <p>Here is my code in AgentsType.php:</p> <pre><code>public function buildForm(FormBuilderInterface $builder, array $options) { $builder -&gt;add('agents', 'entity', array( 'class' =&gt; 'MyBundle:agents', 'property' =&gt; 'name',)); $formModifier = function(FormInterface $form, agents $agent) { $description = $agent-&gt;getDescription(); $form-&gt;add('description', 'text'); }; $builder-&gt;addEventListener( FormEvents::PRE_SET_DATA, function(FormEvent $event) use ($formModifier) { $data = $event-&gt;getData(); //ERROR HERE, returns NULL $formModifier($event-&gt;getForm(), $data-&gt;getAgent()); // Exception HERE } ); $builder-&gt;get('agents')-&gt;addEventListener( FormEvents::POST_SUBMIT, function(FormEvent $event) use ($formModifier) { $agent = $event-&gt;getForm()-&gt;getData(); $formModifier($event-&gt;getForm()-&gt;getParent(), $agent); } ); } </code></pre> <p>$event->getData(); is NULL, I var_dumped $event and it's a very big amount of objects.</p> <p>The purpose is to generate the form dynamically after choosing an agent entity in a select field, in this case a description field.</p> <p>Can anyone advice me what to do with this error or why is getData() = NULL??</p> <p>EDIT:</p> <p>The main purpose of this is that the user can add/disable/update Agents. The main idea is to show just a select or dropdown field and an "Add Agent" button. If the user selects one name from the select field, then is the form for the Agents Entity filled with its data. That's the reason to have an EventListener, to detect any selection in the select field, and then show the data according to the user selection. Hope this clarifies a bit the goal.</p>
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    1. USagapitocandemor
    1. USagapitocandemor
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    1. COI'm not sure, but is there any data at the "PRE_SET_DATA" event? So is there any result when calling `getData()`?
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      1. USBenny
    2. COI'm following this docu http://symfony.com/doc/current/cookbook/form/dynamic_form_modification.html, and I've seen more examples and they implement the PRE_SET_DATA event like that. It should be data there.
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    3. COOh I got what the event is used for. Did you set any initial data in your controller, where you instantiate the form?
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      1. USBenny
 

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