How to filter value of spesific field before saving it to DB

This topic has 5 replies, 2 voices, and was last updated 6 years, 7 months ago by foundbutlost.

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April 24, 2018 at 12:55 PM #9347

foundbutlost
Participant

What is the hook to change text field value before saving it to database?

it seems i have to use this filter but i still dont get it how to do it.
$meta_box = apply_filters( 'rwmb_normalize_field', $field );

Example: i type "this is my value" on the text field, but when i publish/update the post, i want only "my value" saved to the database. i know how to change it, just tell me what hook and where to put the code. Thanks!

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April 24, 2018 at 1:37 PM #9348

Anh Tran
Keymaster

You can use rwmb_{$field_type}_value or rwmb_{$field_id}_value. Please see this docs.

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April 24, 2018 at 2:00 PM #9350
foundbutlost
Participant
Ah silly me, how could i've missed that :'D, but still i'm not too familiar with the code explanation.

$new = apply_filters( "rwmb_{$field['id']}_value", $new, $field, $old );

Where do i put this code? how come even i have $old when i have nothing as i'm inserting a new data? which variable holding this value “this is my value”? because i need to do str replace on it.

i'm really confused, usually when i want to change output of plugin i just simply use add filter and a function like this:
```
add_filter( 'the_content', 'filter_my_content' );
function filter_my_content( $content ) {
some code here
}
```
please help me

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April 24, 2018 at 5:51 PM #9354
foundbutlost
Participant
I tried this after found this thread https://support.metabox.io/topic/woocommerce-prdoucts-image-gallery-with-metabox-image-fields/#post-7904
```
add_filter( 'rwmb_meta_boxes', 'my_meta2_box' );
function my_meta2_box( $meta_boxes ) {
    $meta_boxes[] = array (
      'title' => 'Meta song',
      'table' => 'wp_xxxx',
      'storage_type' => 'custom_table',
      'post_types' =>   array (
         'post',
      ),
      'context' => 'form_top',
      'priority' => 'high',
      'status' => 'publish',
      'autosave' => false,
      'fields' =>   array (
         
        array (
          'id' => 'my_field_id',....

add_filter( 'rwmb_my_field_id_value', function ( $value ) {
    $value = 'it works';
    return $value;
} );
```
but it doesnt work, welp 🙁

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April 24, 2018 at 11:07 PM #9358
Anh Tran
Keymaster
Hi,

The filter:

$new = apply_filters( "rwmb_{$field['id']}_value", $new, $field, $old );

means that the value of the field ($new) will run through a filter called rwmb_YOURFIELDID_value. This filter has 3 params:
- $new: the submitted value of the field
- $field: field settings (array)
- $old: the current value of the field, which is stored in the custom field. If field is new, then it's an empty string.
So, to add a filter to change the field value, please run:
```
add_filter( 'rwmb_YOURFIELDID_value', function( $new, $field, $old ) {
    $new = 'Your new value';
    return $new;
}, 10, 3 );
```
Just add it to your functions.php file of your theme. That's all.

Hope that's clear 🙂

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April 25, 2018 at 9:43 AM #9365

foundbutlost
Participant

Yes now it's become very clear. i actually trying to input youtube url on oEmbed field but i only want save its video ID when it goes to database so i can save more space but still be able to see the video preview below the oEmbed field using thereverse filter rwmb_fieldID_field_meta.

Thank you so much and case closed!

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