How can I prevent the name field being changed after a page is created?

[DrQuincy]

Just that…once a page is created I do not want to allow the page slug/name to ever be changed. So the name should be available no the initial page during creation but not after that.

Is that easy enough to do?

Thanks!

[bernhard]

Yes, quite easy ? 

$wire->addHookAfter(
  'ProcessPageEdit::buildForm',
  function (HookEvent $event) {
    $form = $event->return;
    $page = $event->process->getPage();

    // if page is young enough don't lock the page name field
    $lockPagenameAfterSeconds = 60;
    if ($page->created > time() - $lockPagenameAfterSeconds) return;

    // get field and set status to collapsed + locked
    $field = $form->get('_pw_page_name');
    $field->collapsed = Inputfield::collapsedLocked;
    $field->notes = 'Can not be changed any more';
  }
);

Alternatively you could use $page->meta() to set a flag at some point instead of waiting 60s.

[DrQuincy]

Awesome, and thanks for the fast response!

[Jan Romero]

I could have sworn there was a $config->advanced option in template settings to disable this, but apparently there is only one to prevent a page from being moved. Of course, you might want to do that, too, if you need stable urls.

Also note Bernhard’s hook only hides the field from the edit form, but it could still be changed through code or even (I believe) with simple browser dev tools trickery on the part of an editor. To prevent it even through the API you could probably hook into Pages::savePageOrFieldReady: https://processwire.com/api/ref/pages/save-page-or-field-ready/

[DrQuincy]

Thank you!

[da²]

3 hours ago, bernhard said:

// if page is young enough don't lock the page name field

I would just use if ($page->isNew()). This is true when we are on the very first page form with only the title and name fields. Then it's false.

This is the same as if (!$page->id).

Edited July 16 by da²

[DrQuincy]

Thanks everyone.

I have also noticed that $page->created === 0 works too.