How can I pre-populate fields in new frontend submission?

This topic has 2 replies, 2 voices, and was last updated 7 months, 3 weeks ago by phillcoxon.

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January 17, 2024 at 5:36 PM #44312

phillcoxon
Participant

I have two custom post types - tramp-detail and tramp-log, with field tramp_id and tramp_log_id joined by a MB Relationship.

Website visitors viewing a tramp single page can click a link that will take them to a new tramp-log frontend submission form.

I want to pass the tramp_id to the front-end submission form via url parameter (example.com/add-tramp-log/?tramp_id=123) and use it to pre-populate the tramp_id in the relationship field.

Is it possible to pre-populate fields in a frontend submission form? If so, is someone able to give an example please? I've searched for some time and haven't found any examples.

Thanks in advance!

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January 17, 2024 at 9:25 PM #44316
Peter
Moderator
Hello Phil,

I think it is possible. You will need to register the relationship by code to use the select field and some jQuery code to pre-select the dropdown value. For example:

Code to register the relationship:
```
MB_Relationships_API::register( [
    'id'   => 'tramp_detail_to_tramp_log',
    'from' => [
        'object_type'  => 'post',
        'post_type'    => 'tramp-detail',   
        'field' => [
            'field_type' => 'select',
        ]
    ],
    'to'   => [
        'object_type'  => 'post',
        'post_type'    => 'tramp-log',        
        'field' => [
            'field_type' => 'select',
        ]
    ],
] );
```
jQuery code:
```
jQuery(document).ready(function($) {
    //get the ID from the URL and assign it to "value"
    $('#tramp_detail_to_tramp_log_to option[value=123]').attr('selected', 'selected');     
});
```
you can change tramp_detail_to_tramp_log_to to tramp_detail_to_tramp_log_from depending on the relationship side.

Note: the code is for example. If you cannot complete the task, please contact an expert developer to help you in this case.

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January 21, 2024 at 1:23 AM #44358
phillcoxon
Participant
Thank you.

Here's how I ended up doing this with code in functions.php:
```
// Check if the current page is the "add new post" front end submission page for the "tramp-log" custom post type

$current_page_id = get_the_ID();

//if (is_page('15585')) {
if ($current_page_id == "15585") {
    /* see https://docs.metabox.io/filters/rwmb-field-meta/ */

    add_filter("rwmb_tramp_id_field_meta",function ($value, $field, $saved) {
            $value = isset($_GET["tramp_id"]) ? $_GET["tramp_id"] : $value;
            return [$value, $field];
        },10,3);
}
```
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