Config example

 add_filter( 'jet-engine-extend-form-actions/config', function() {
    return array(
        123 => array(
            '_form_field_1' => array(
                'prop' => 'post_meta',
                'key'  => '_meta_key',
            ),
            '_form_field_2' => array(
                'prop' => 'post_terms',
                'tax'  => 'taxonomy_slug',
                'by'   => 'name',
            ),
            '_form_field_3' => array(
                'prop'   => 'post_data',
                'key'    => 'post_title',
                'suffix' => ' -',
            ),
            '_form_field_4' => array(
                'prop'   => 'post_data',
                'key'    => 'post_title',
                'prefix' => ' ',
            ),
        ),
    );
 } );

Where:

• 123 - required form ID (you can find it in the address bar on the edit for screen).
• _form_field_1, _form_field_2, ... - names of the submitted form field to get data from.
• prop - 'post_data', 'post_meta' or 'post_terms' - type of data to set.
• key - for 'post_meta' prop - is the meta key name to set, for 'post_data' - is the property of the post object to set.
• tax - for 'post_terms' prop - taxonomy name to insert new terms into. You can also set 'tax' argument for post_meta in cases when you need to duplicate selected term from current taxonomy into meta field.
• prefix, suffix - this arguments are used when you combining multiple fiels values into the same post field or meta key. Prefix is what need to be added before combined field, suffix - after
• by - for the terms input is way how terms will be processed - if value is set to 'id' - passed terms IDs will be attaqched to post, with any other values - plugin will create term at first and than attach it to post

How to use

• Download, install and activate plugin;
• Add configuration code (see example above) into the end of functions.php file of your active theme.

Combine post title from multiple form fields example

Meta fields only:

add_filter( 'jet-engine-extend-form-actions/config', function() {
    return array(
        537 => array(
            '_form_field_1' => array(
                'prop'   => 'post_data',
                'key'    => 'post_title',
                'prefix' => '#',
                'suffix' => ':',
            ),
            '_form_field_2' => array(
                'prop'   => 'post_data',
                'key'    => 'post_title',
                'prefix' => ' ',
                'suffix' => '!',
            ),
        ),
    );
} );

Meta fields combined with taxonomy terms:

add_filter( 'jet-engine-extend-form-actions/config', function() {
    return array(
        537 => array(
            '_test_field_2' => array(
                'prop' => 'post_data',
                'key'  => 'post_title',
            ),
            '_test_field' => array(
                'prop'   => 'post_data',
                'key'    => 'post_title',
                'tax'    => 'category',
                'prefix' => ', ',
            ),
        ),
    );
} );

Multiple props for the same form field example

add_filter( 'jet-engine-extend-form-actions/config', function() {
    return array(
        39 => array(
            'inserted_post_id' => array(
                'props' => array(
                    array(
                        'prop'   => 'post_data',
                        'key'    => 'post_title',
                        'prefix' => '#',
                    ),
                    array(
                        'prop'   => 'post_data',
                        'key'    => 'post_name',
                    ),
                ),
            ),
        ),
    );
} );