Regarding page reference for page/product's categorization

[adrianmak]

I knew that page reference field can be user for categorization.

Is it possible to select a child root as page reference.

Take an example.

I created a page named Categories, the page structure look like below

Home (site root)

  +--About Company

  +--Our Services

  +--Product

  +--Contact Us

  +--Categories

       +--News

            +--Company news

            +--Market news

       +--Products type

            +--plastic

            +--metal

       +--Pictures type

            +--plastic

            +--metal

            +--paper

            +--company

The child pages , News, Products type, Pictures type, under categories are no association to each others.

For a Product page with a page reference field, only "Products type" has meaning to Product. Could I select "Products type" child root  as page reference ?

[SiNNuT]

Yes, if you have a page reference field that is specific to Product pages, you can go to the field settings, under the Input tab and then select Products type as Parent of selectable pages. Or use one of the other settings.

If your page reference field is used on different kinds of pages (Product, News etc.) and you want a 'dynamic' Parent of selectable pages, depending on the type of page it is used on, maybe this can be done via the custom php option. Some sort of conditional parent, but i'm not sure if possible.

[adrianmak]

How or is it possible to select multiple child root as page reference ? instead of using two separate page reference fields

Something look like.....

[SiNNuT]

I'm not sure. This would involve an inputfield that allows for <optgroup>. I've read that this should be possible somehow with InputfieldSelect but i've yet to read how exactly this could be done. More info here: https://processwire.com/talk/topic/11348-select-input-field-with-opt-groups/

[LostKobrakai]

It's possible to have the inputfield render optgroups but FieldtypePage has no option to provide the necessary nesting of pages to support that. I think currently only manual setup does allow for those groupings.

[adrianmak]

one more question regarding page reference.

From op, I grouped categories into three groups  , News, Products type and Pictures type

In which each group is referenced by three template independently

ie

News is referenced by News template

Product type is referenced by Product template

Pictures type is referenced by Picture template

How could I create a single page field type and dynamic associated each group for each page template.

Instead of create three  different category input fields

[LostKobrakai]

I think the only solution would be hook into InputfieldPage::render and replacing all it's logic with a custom implementation for the field you need the optgroups for. 

[Jan Romero]

News is referenced by News template

Product type is referenced by Product template

Pictures type is referenced by Picture template

How could I create a single page field type and dynamic associated each group for each page template.

Instead of create three  different category input fields

In your page field settings go to Input, expand “Custom PHP code to find selectable pages” under “Selectable Pages”. You can fill your input field according to the template of the page being edited, by checking $page->template:

if ($page->template->name === 'News') {
    return $pages->find('parent=/categories/news/');
}
else if ($page->template->name === 'Product') {
    return $pages->find('parent=/categories/products-type/');
}
else if ($page->template->name === 'Picture') {
    return $pages->find('parent=/categories/pictures-type/');
}

Make sure to remove all the other options from “Selectable Pages”. Sometimes they don’t get overridden properly.

[adrianmak]

In your page field settings go to Input, expand “Custom PHP code to find selectable pages” under “Selectable Pages”. You can fill your input field according to the template of the page being edited, by checking $page->template:

if ($page->template->name === 'News') {
    return $pages->find('parent=/categories/news/');
}
else if ($page->template->name === 'Product') {
    return $pages->find('parent=/categories/products-type/');
}
else if ($page->template->name === 'Picture') {
    return $pages->find('parent=/categories/pictures-type/');
}

Make sure to remove all the other options from “Selectable Pages”. Sometimes they don’t get overridden properly.

Thank you very much.

[adrianmak]

Last night, I implemented the custom php code to find selectable pages.

Pages structure

Here is my code

The categories of pages under "News" pages could get the right categories from "Categories" correctly.

However, PW returned an error with a selected category of this page.

"Error saving field "categories" - Page 1046 is not valid for categories (Page 1046 does not have required parent 1)

PS it's working for the "Recycling Library"

[LostKobrakai]

Remove the parent "Home".

[adrianmak]

Remove the parent "Home".

I see~~~~~~