Add Select Values from Other Custom Fields

This topic has 13 replies, 2 voices, and was last updated 1 year, 3 months ago by Anh Tran.

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December 6, 2018 at 8:33 AM #12512

Resolved Pete Wlodkowski
Participant

Hi, I have a few custom number fields, created in Advanced Custom Fields and assigned to my custom post type.

I want to populate a Meta Box select field on the same custom post type from these values.

So, I have the following number / text fields, each with a single value, ex: 40

field_1
field_2
field_3
field_4

I want to use these as the value options / select options for my meta box select field.

How might I achieve this?
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December 6, 2018 at 8:33 AM #12513

Pete Wlodkowski
Participant

By the way, I used the meta box builder to create the select field.

December 6, 2018 at 9:43 AM #12514

Pete Wlodkowski
Participant

Here is the PHP to show my custom fields:

<?php the_field( ‘w’ ); ?>
<?php the_field( ‘ru’ ); ?>
<?php the_field( ‘t5s’ ); ?>
<?php the_field( ‘t10q’ ); ?>
<?php the_field( ‘t1516’ ); ?>
<?php the_field( ‘t20’ ); ?>
<?php the_field( ‘t3032’ ); ?>
<?php the_field( ‘t40’ ); ?>

This is what I want to populate my select options with.

December 6, 2018 at 2:44 PM #12520
Anh Tran
Keymaster
Hi Pete,

The Meta Box Builder doesn’t allow you to use dynamic values from other fields at the moment. You need to create the meta box and field by code.

Here is an example:
```
add_filter( 'rwmb_meta_boxes', function( $meta_boxes ) {
    $post_id = null;
    if ( isset( $_GET['post'] ) ) {
        $post_id = intval( $_GET['post'] );
    } elseif ( isset( $_POST['post_ID'] ) ) {
        $post_id = intval( $_POST['post_ID'] );
    }

    $options = array(
        'w' => get_post_meta( $post_id, 'w', true ),
        'ru' => get_post_meta( $post_id, 'ru', true ),
        // and so on.
    );

    $meta_boxes[] = [
        'title' => 'Your title',
        'fields' => [
            [
                'type' => 'select',
                'id' => 's',
                'name' => 'Select',
                'options' => $options,
            ],
        ],
    ];
} );
```
December 7, 2018 at 5:51 AM #12538

Pete Wlodkowski
Participant

Thank you very much for getting back to me.

Okay, so I can’t use the builder at all? Can I convert what I have built to code and modify that?

December 7, 2018 at 6:00 AM #12539

Pete Wlodkowski
Participant

Oh, okay, I found the code tab. Thank you!

December 7, 2018 at 6:21 AM #12540

Pete Wlodkowski
Participant

So, I’m assuming I can use the builder, copy the code, edit it, paste the code into functions, and deactivate the builder? Is that a correct flow?

December 7, 2018 at 10:50 AM #12543

Anh Tran
Keymaster

Yes, that’s the correct flow. It’s useful whenever you want to do advanced things with code.

December 14, 2018 at 12:57 AM #12659
Pete Wlodkowski
Participant
Okay, great, so I have this set up – I rebuild the fields I want to use for my dropdown options in Meta Box instead of ACF.

So, the fields I want to use for the Points dropdown are:

W
RU
T5
T10
T15
T20
T30
T40

My code is below:

https://ghostbin.com/paste/9gg73

Is it still basically the same to populate the points dropdown options…

I tried to modify the snippet you sent to this:
```
$options = array(
        'w' => get_r_points_table( $post_id, 'points_w', true ),
        'ru' => get_r_points_table( $post_id, 'points_ru', true ),
        // and so on.
    );

                    array (
                        'id' => 'ppoints',
                        'name' => 'Points',
                        'type' => 'select',
                        'placeholder' => 'Select an Item',
                        'options' => $options,
                        'columns' => 1,
                    ),
```
But it came up empty…

Thank you for your assistance!

This plugin is so great. I realize the limits to what I can build in WordPress are much broader now.

Thank you.
December 14, 2018 at 3:08 AM #12661

Pete Wlodkowski
Participant

TO show you the back-end, post edit screen…. I’m trying to get the tournament points to populate the points select dropdown:

December 14, 2018 at 10:48 AM #12666

Anh Tran
Keymaster

Oh, you use group! So the code to get the point should be different a little bit. I’ve fixed your code to: https://ghostbin.com/paste/9p34h. Please take a look.
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