File

import File from '../_parts/_file.md'; import CustomUploadFolder from '../_parts/_custom-upload-folder.md'; import Screenshots from '@site/src/components/Screenshots';

The file field creates a simple file upload with default UI like <input type="file">. Unlike other media fields, this field doesn't use Media Library UI to upload files.

Screenshots

Settings

Besides the common settings, this field has the following specific settings, the keys are for use with code:

Name	Key	Description
Max number of files	`max_file_uploads`	Max number of uploaded files. Optional.
Force delete	`force_delete`	Whether or not delete the files from Media Library when deleting them from post meta. `true` or `false` (default). Optional. Note: it might affect other posts if you use the same file for multiple posts.
Custom upload folder	`upload_dir`	Full path to a custom upload folder.
Unique filename callback	`unique_filename_callback`	Custom callback to set the uploaded file name. Works only when uploading to a custom folder.

This is a sample field settings array when creating this field with code:

[
    'id'               => 'file',
    'name'             => 'File',
    'type'             => 'file',
    'force_delete'     => false,
    'max_file_uploads' => 2,
],

Data

This field saves multiple attachment IDs in the database. Each value (attachment ID) is stored in a single row in the database with the same meta key (similar to what add_post_meta does with the last parameter false).

Custom upload folder

Template usage

Filters

This field has some filters to change the texts displayed on the screen..

Filter	Default	Description
`rwmb_file_upload_string`	Upload Files	File upload string
`rwmb_file_add_string`	+ Add new file	Add new file string
`rwmb_file_delete_string`	Delete	File delete string
`rwmb_file_edit_string`	Edit	File edit string

All filters above accept 2 parameters:

$string: the string needs to be changed
$field: array of the field settings

The code below changes the "+ Add new file" string:

add_filter( 'rwmb_file_add_string', function () {
    return '+ New File';
} );

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