Generate select options in a form

Archive
1

Hello.
I am trying to get a dynamic list of subpages in a form <select> field.

Here’s an extract of what I’m trying to write in the frontmatter:

content:
    items: @self.children
form:
    name: select-a-page
    fields:
        -
            name: page
            label: 'What page?'
            type: select
            options:
                '{% for p in page.collection %},{{ p.slug }}:{{ p.title }},{% endfor %}'
            validate:
                required: true

But it gets an Invalid frontmattererror when saving. How can I do this?

Thanks!

2

Nevermind for the Invalid, it was something else. It does save, but the selector is empty.

3

There’s no way to do what you are trying to do. The problem is that even if you enable Twig processing in frontmatter: pages: frontmatter: process_twig: true (in system.yaml), when that runs the collection defined by the content items has not been processed.

The way you should do dynamic options is to call a static function.

You can put this function in a plugin or even in your theme. You just need to reference it adaquately.

4

Hi, thank you a lot for your answer, I will look into this.
What would the function look like? I understand how to call it, but not exactly how to write it.

5

It just needs to return a PHP array in a name/value format. e.g.

$options = [
  'option-a' => 'Option A',
  'option-b' => 'Option B'
];

return $options;
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