Fetch query from parent page

Kirby 2 Solved ✅
13

Try this:

<?php

class CategoryField extends BaseField {

  public function __construct() {
    $this->type    = 'category';
    $this->icon    = 'chevron-down';
    $this->label   = 'category';
    $this->options = array();

  }  
public function options() {
    return FieldOptions::build($this);
  }
  public function option($value, $text, $selected = false) {
    return new Brick('option', $this->i18n($text), array(
      'value'    => $value,
      'selected' => $selected
    ));
  }
  	public function input() {
  		$select = new Brick('select');
  		$select->addClass('selectbox');
  		$select->attr(array(
	      'name'         => $this->name(),
	      'id'           => $this->id(),
	      'required'     => $this->required(),
	      'autocomplete' => $this->autocomplete(),
	      'autofocus'    => $this->autofocus(),
	      'readonly'     => $this->readonly(),
	      'disabled'     => $this->disabled(),
	    ));
  	    
    $select = $select->append($this->option('', '', $this->value() == ''));

    
  	
  	if($this->readonly()) {
      $select->attr('tabindex', '-1');
    }

    if(kirby()->site()->event_types()) {
      $event_types = kirby()->site()->event_types()->toStructure();
    }
   
    foreach($event_types as $event_type)  {
      $text = $event_type->event_name();
      $value = $event_type->event_code();
      $keys[] = $value;
      $values[] = $text;
    }
    $this->options = array_combine($keys, $values);
    
    foreach($this->options() as $value => $text) {
      $select->append($this->option($value, $text, $this->value() == $value));
    }

    $inner = new Brick('div');
    $inner->addClass('selectbox-wrapper');
    $inner->append($select);

    $wrapper = new Brick('div');
    $wrapper->addClass('input input-with-selectbox');
    $wrapper->append($inner);

    if($this->readonly()) {
      $wrapper->addClass('input-is-readonly');
    } else {
      $wrapper->attr('data-focus', 'true');
    }

    return $wrapper;
  	
  }

}

Note: This will probably fail if either the event_type or event_name fields are empty, so you would either have to require the fields to be filled in or handle missing fields entries in the code. The external API solution I suggested in this thread Panel: querying "site.txt" structure fields as pages/subpages fields' values is probably the better solution.