ACF: Update field value based on value of another field

Question

I have some custom posts that lists cars, motorcycles and trucks.

The values in the ACF fileds are automaticaly populated and I cannot change them manually because they come from an external software.

In this CPT I have 2 ACF fields (both are text fields):

one called “Categroy” that can be Cars, Motorcycle, Truck.

Another one called “Service”, that can be a value from 1 to 9.

As you can see the “objects” can have different Categories but they maybe share the same “Service”.

For example:

Categroy = Car Service = 9

Category = Truck Service = 9

I would like to update the value of the ACF Field “Service” based on the value in “Category”.

For example:

if Category is “Car” and the Service is 9, then 9 should be udpated in “Rent”

if Categroy is “Truck” and Service is 9, then 9 should be udpated in “Buy”

How can I achieve that?

Answer 1

Hello You can Use The below Code

 function UpdateServiceField($post_id){
    $category_field = get_field('category',$post_id);
    $service_field = get_field('service',$post_id);
    if ($category_field ==9) {
        update_field('service','9',$post_id); 
    }
}
add_action('acf/save_post', 'UpdateServiceField', 20); 

Answer 2

Here is a more complete example . you want to change the content of some fields based on the selection of a combo box. Here the JS part : jQuery(document).ready(($) => { acf.addFilter('select2_ajax_data',(data, args, $input, field, instance) => {

        // Get the combo field instance

        let your_combo = acf.getFields({
            name: 'your_combo_field_name'
        })[0];

        if (your_combo !== undefined && (data.field_key === field.get('key')) {
                data.your_value = your_combo.val();  // Here is the magic ;)
            }
        }
    });

})