Option Group support for Select/Select Advanced Field Types

This topic has 8 replies, 2 voices, and was last updated 1 year, 10 months ago by pluginoven.

Creator

Topic
March 23, 2018 at 7:29 PM #8932
Resolved pluginoven
Participant
There is currently no support for the <a> tag in the Select and Select-Advanced field types. Before I start creating a custom field type that supports optgroup, I thought it best to get some thoughts on this.

Logically, the field options could be defined like so:
```
'options'    => array(
                        'Monkeys' => array(
                            'king_kong' => 'King Kong',
                            'curious_george' => 'Curious George'
                        ),
                        'Donkeys' => array(
                            'eeyore' => 'Eeyore',
                            'gus' => 'Gus'
                        )
                ),
```
From a quick investigation the following elements would need to be overwritten
1. RWMB_Choice_Field > get_options
2. RWMB_Select_Field > walk
3. RWMB_Walker_Select > start_el
Does it make more sense to change the core to support this standard HTML element, or build a custom field type? Am I the only one that missed the optgroup tag? Thoughts?
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Viewing 8 replies - 1 through 8 (of 8 total)

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March 23, 2018 at 7:30 PM #8933

pluginoven
Participant

Looks like I missed the closing a tag on the link to optgroup. Sorry, wish I could edit, but that’s not possible.

March 24, 2018 at 7:30 PM #8947

pluginoven
Participant

Thank you for fixing the link in the initial post. Should read:
There is currently no support for the <optgroup> tag in the Select and Select-Advanced field types…

March 24, 2018 at 9:34 PM #8948

pluginoven
Participant

Update: there seems to be a special field type (not in the documentation, by the way) called a ‘select-tree’ that was brought up in this thread: https://metabox.io/support/topic/custom-select-tree/

Seems like a better starting point then the standard select field….

March 26, 2018 at 5:14 PM #8960

Anh Tran
Keymaster

Hello,

Thanks for bringing an interesting question. I was thinking about this, too. However, the problem is changing the syntax, which requires a lot of code to be modified. Not sure how to do it best and clean.

March 26, 2018 at 9:26 PM #8964
pluginoven
Participant
I was able to achieve something building off of the standard select field. I created a new field type called: ‘selectomatic’ which is defined as so:
```
array(
    'type'    => 'selectomatic',
    'id'      => 'animal_select',
    'name'    => 'Animals',
    'options' => array(
        array( 'value' => 'monkey', 'label' => 'Monkeys' ),
            array( 'value' => 'king_kong', 'label' => 'King Kong', 'parent' => 'monkey' ),
            array( 'value' => 'curious_george', 'label' => 'Curious George', 'parent' => 'monkey' ),
        array( 'value' => 'donkey', 'label' => 'Donkeys' ),
            array( 'value' => 'eeyore', 'label' => 'Eeyore', 'parent' => 'donkey' ),
            array( 'value' => 'guss', 'label' => 'Gus', 'parent' => 'donkey' ),
    ),
    'flatten' => false
),
```
Then I extended the Select Field Class and Select Walker Class like so:
```
class RWMB_Walker_Selectomatic extends RWMB_Walker_Select {

		public function start_el( &$output, $object, $depth = 0, $args = array(), $current_object_id = 0 ) {
			$label  = $this->db_fields['label'];
			$id     = $this->db_fields['id'];
			$meta   = $this->meta;
			
			if($depth){
				$output .= sprintf(
					'<option value="%s" %s>%s</option>',
					esc_attr( $object->$id ),
					selected( in_array( $object->$id, $meta ), true, false ),
					esc_html( RWMB_Field::filter( 'choice_label', $object->$label, $this->field, $object )
					)
				);
			}
			else{
				$output .= sprintf(
					'<optgroup label="%s">',
					esc_html( RWMB_Field::filter( 'choice_label', $object->$label, $this->field, $object )
					)
				);
			}
		}

		public function rwmb_end_html_el( &$output, $object, $depth = 0, $args = array(), $current_object_id = 0 ) {
			if(!$depth){
				$output .= '</optgroup>';
			}
		}
	}
```
It’s not beautiful, but it’s a work-around that… works!
March 26, 2018 at 9:27 PM #8965

pluginoven
Participant

Uggg… again with the markdown. Please wrap that last code in proper backticks.

March 26, 2018 at 10:06 PM #8966
pluginoven
Participant
Here are the full selectomatic custom field extended classes based on the Select field:
```
if ( class_exists( 'RWMB_Field' ) ) {
	class RWMB_Selectomatic_Field extends RWMB_Select_Field {
		public static function walk( $field, $options, $db_fields, $meta ) {
			$attributes = self::call( 'get_attributes', $field, $meta );
			$walker     = new RWMB_Walker_Selectomatic( $db_fields, $field, $meta );
			$output     = sprintf(
				'<select %s>',
				self::render_attributes( $attributes )
			);
			if ( false === $field['multiple'] ) {
				$output .= $field['placeholder'] ? '<option value="">' . esc_html( $field['placeholder'] ) . '</option>' : '';
			}
			$output .= $walker->walk( $options, $field['flatten'] ? - 1 : 0 );
			$output .= '</select>';
			$output .= self::get_select_all_html( $field );
			return $output;
		}
	}

	class RWMB_Walker_Selectomatic extends RWMB_Walker_Select {

		public function start_el( &$output, $object, $depth = 0, $args = array(), $current_object_id = 0 ) {
			$label  = $this->db_fields['label'];
			$id     = $this->db_fields['id'];
			$meta   = $this->meta;

			if($depth){
				$output .= sprintf(
					'<option value="%s" %s>%s</option>',
					esc_attr( $object->$id ),
					selected( in_array( $object->$id, $meta ), true, false ),
					esc_html( RWMB_Field::filter( 'choice_label', $object->$label, $this->field, $object )
					)
				);
			}
			else{
				$output .= sprintf(
					'<optgroup label="%s">',
					esc_html( RWMB_Field::filter( 'choice_label', $object->$label, $this->field, $object )
					)
				);
			}
		}

		public function rwmb_end_html_el( &$output, $object, $depth = 0, $args = array(), $current_object_id = 0 ) {
			if(!$depth){
				$output .= '</optgroup>';
			}
		}
	}
}
```
March 29, 2018 at 3:01 PM #9003

pluginoven
Participant

Issue can be marked as resolved.
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