How to trigger an action when a specific option on the settings page is changed

This topic has 3 replies, 2 voices, and was last updated 2 years, 9 months ago by Rodrigo.

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March 24, 2022 at 12:54 AM #35243
Rodrigo
Participant
Hi Long,

I want to trigger some code after an option in my settings page changes. I know that in general I can trigger any code when an option change using pre_update_option_{$option} (see below).

But how do I use this filter with a custom field in a settings page created with Meta Box?
```
function check_option_change( $new_value, $old_value, $option ) {

    if ( $new_value !== $old_value && ! empty( $new_value ) ) {

    	// I want to trigger some code here.
    }

    return $new_value;
}

add_filter( 'pre_update_option_my-settings', 'check_option_change', 10, 3 );
```
Thank you.

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March 24, 2022 at 12:40 PM #35252

Long Nguyen
Moderator

Hi,

You can use the filter rwmb_{$field_id}_value to modify the value of a specific field.
Or the action rwmb_{$field_id}_after_save_field to do something after saving a specific field.

Read more on the documentation
https://docs.metabox.io/filters/#rwmb_field_type_value
https://docs.metabox.io/actions/#rwmb_after_save_field

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March 24, 2022 at 8:14 PM #35263

Rodrigo
Participant

Thanks, that will do it.

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March 25, 2022 at 6:46 AM #35280
Rodrigo
Participant
I think I found a bug in both rwmb_{$field_id}_after_save_field and rwmb_{$field_type}_after_save_field actions.

The below code does not work with either action, but if I use rwmb_after_save_field instead, the my_other_field_id value updates just fine.
```
add_action( 'rwmb_my_field_id_after_save_field', function( $null, $field, $new_value, $old_value ) {

    if ( $new_value !== $old_value ) :

        rwmb_set_meta( MY_OPTIONS, 'my_other_field_id', date('y-m-d h:i:s'), [ 'object_type' => 'setting' ] );

    endif;
}, 99, 4 );
```
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