Form is submitting on every re-render

[FrancoisCossette]

Using ComponentWithFormTrait, I notice that every re-render of the form submits it thanks to it's submitFormOnRender function and this seems to be intentionally mandatory.

I have some FormEvents that listen to Submit events to process the submitted data, and they are not liking this. Since I'm setting some fields as required, I expect them to be submitted with that, but now they are receiving some empty data on every re-render.

It seem to me that the only way to fix this is to make sure that my events can handle missing data, even when it's required data. Is this really the only way, or am I missing something?

[julian-koster]

There are other options which are not recommended and bad practice (I included an example of such a workaround below), but the submitFormOnRender is mandatory when using ComponentWithFormTrait.
You could pre-fill data, render some part of the form in the livecomponent, other parts outside of it, etc. I've been using this bundle a lot over the past year and haven't found an easier workaround than (like you suggest) configuring your events to handle empty data.

I usually go this route:

public function onFormSubmit(FormEvent $event)
{
    $data = $event->getData();
    if (empty($data['requiredField'])) {
            $data['requiredField'] = 'someDefaulValue';
            $event->setData($data); 
    }
}

[sadikoff]

Hi @FrancoisCossette

it depends on what you want to achieve, for example, if you have a real button to submit data, you can disable auto submit and do it only when the button is pressed.

@juuuuln yeah that is probably a workaround, but it's totally not a good practice

[julian-koster]

@sadikoff, I should've mentioned that it isn't recommended and hacky. Will update my comment!