Show a field in admin only if the page you are editing has children

[cb2004]

So if I am editing a page and it has children, can I display a text box?

Cheers.

[bernhard]

this in your /site/ready.php

<?php
$wire->addHookAfter("ProcessPageEdit::buildForm", function(HookEvent $event){
    $process = $event->object;
    $form = $event->return;
    $page = $process->getPage();

    // remove field when actual page has no children
    if($page->numChildren == 0) {
        $form->remove($form->getChildByName('your_field_name'));
    }
});

[cb2004]

Cheers BernhardB, no joy I am afraid though.

Edit: scrap that, I enabled debug mode and then all was fine. Thanks.

Edited January 5, 2016 by cb2004

[bernhard]

So if I am editing a page and it has children, can I display a text box?

Cheers.

what do you exactly mean by "text box" ?

Cheers BernhardB, no joy I am afraid though.

?

[cb2004]

It works fine, cheers (edited my above post). Where can I read up more about hooks?

[bernhard]

hi cb2004,

glad it worked.

1) google

https://www.google.at/search?q=site:processwire.com+hooks&gws_rd=cr&ei=IzeMVuCqMYSnU7jZuIAK

2) the helloworld module

https://github.com/ryancramerdesign/ProcessWire/blob/master/site-default/modules/Helloworld.module

3) blog (especially for my suggested way of using ready.php)

https://processwire.com/blog/posts/processwire-2.6.7-core-updates-and-more/

i recommend reading the blog regularly - that's a great place to learn

4) go through the modules directory and see how others do it. start with simple modules and then go further. and one day you will have to dive into the "wire" folder

have fun

[cb2004]

Yeah I jumped into the blog post shortly after and came up with the following:

<?php

$pages->addHookAfter("ProcessPageEdit::buildForm", function($event) {
	$form = $event->return;
	$page = $event->object;

	if ($page->template->id == 47 && $page->numChildren == 0) {
		$form->remove($form->getChildByName("rte_basic_2"));
	}
});

[kongondo]

It works fine, cheers (edited my above post). Where can I read up more about hooks?

All About ProcessWire Hooks

http://processwire.com/api/hooks/