Reply To: Disable Options for Select Field

• eurescom

• November 25, 2019 at 6:31 pm

The problem is we also have an “edit” possibility for not logined users by some “hidden key value” which they receive through email.

The post_id is then selected and given to the acf_form object

 acf_form(array(
     'id' => 'acf-form',
     /* (int|string) The post ID to load data from and save data to. Defaults to the current post ID.
            Can also be set to 'new_post' to create a new post on submit */
     'post_id' => $post_id,
...

Sadly in the called filters function for select field the value is always “null” even When the priority is set to 1 / 10 / 20 / 1000.

A quick look into the source code even shows me that even in the filter ‘acf/pre_render_fields’ the values aren’t set….

from acf_field_functions.php

/**
 * acf_render_fields
 *
 * Renders an array of fields. Also loads the field's value.
 *
 * @date	8/10/13
 * @since	5.0.0
 * @since	5.6.9 Changed parameter order.
 *
 * @param	array $fields An array of fields.
 * @param	(int|string) $post_id The post ID to load values from.
 * @param	string $element The wrapping element type.
 * @param	string $instruction The instruction render position (label|field).
 * @return	void
 */
function acf_render_fields( $fields, $post_id = 0, $el = 'div', $instruction = 'label' ) {

	// Parameter order changed in ACF 5.6.9.
	if( is_array($post_id) ) {
		$args = func_get_args();
		$fields = $args[1];
		$post_id = $args[0];
	}

	/**
	 * Filters the $fields array before they are rendered.
	 *
	 * @date	12/02/2014
	 * @since	5.0.0
	 *
	 * @param	array $fields An array of fields.
	 * @param	(int|string) $post_id The post ID to load values from.
	 */
	$fields = apply_filters( 'acf/pre_render_fields', $fields, $post_id );

	
	// Filter our false results.
	$fields = array_filter( $fields );

	// Loop over and render fields.
	if( $fields ) {
		foreach( $fields as $field ) {

			// Load value if not already loaded.
			if( $field['value'] === null ) {
				$field['value'] = acf_get_value( $post_id, $field );
			}

			// Render wrap.
			acf_render_field_wrap( $field, $el, $instruction );
		}
	}

	/**
	*  Fires after fields have been rendered.
	*
	*  @date	12/02/2014
	*  @since	5.0.0
	*
	* @param	array $fields An array of fields.
	* @param	(int|string) $post_id The post ID to load values from.
	*/
	do_action( 'acf/render_fields', $fields, $post_id );
}

the filter add_filter('acf/load_field/name=myselect'.. is called by far before the actual render of the select field and sadly also way before the value is set.
So your code doesn’t work.