With Drupal console, you can create module settings forms and design values to be stored in config through the interactive command line interface. The generate command is generate:form:config.
This command will generate the routing file, the form file and the default config file for your settings form. Notice _form: '\Drupal\example\Form\ExampleConfigForm' under defaults for the route. This tells drupal to load the form via the form controller.
Go to /admin/config/example/exampleconfig To see and edit the config.
➜ example_site vendor/bin/drupal generate:form:config
// Welcome to the Drupal Form Config generator
Enter the module name [module_filter]:
> example
Enter the Form Class name [DefaultForm]:
> ExampleConfigForm
Enter the Form id [example_config_form]:
>
Do you want to load services from the container? (yes/no) [no]:
>
Do you want to generate a config file? (yes/no) [yes]:
>
Do you want to generate a form structure? (yes/no) [yes]:
>
Available types: button, checkbox, checkboxes, color, date, datelist, datetime, email, entity_autocomplete, field_ui_table, fieldset, file, hidden, image_button, item, language_select, machine_name, managed_file, number, password, password_confirm, path, radio, radios, range, search, select, submit, table, tableselect, tel, text_format, textarea, textfield, token, url, value, weight
Enter a new field properties
New field type (press <return> to stop adding fields) []:
> number
Input label:
> Cache Lifetime
Input machine name [cache_lifetime]:
>
Description []:
> How long to cache the listing.
Default value []:
> 300
Weight for input item [0]:
>
Enter a new field properties
New field type (press <return> to stop adding fields) []:
> textfield
Input label:
> List Name
Input machine name [list_name]:
>
Maximum amount of characters [64]:
>
Width of the textfield (in characters) [64]:
>
Description []:
> The name of the list
Default value []:
>
Weight for input item [0]:
>
Enter a new field properties
New field type (press <return> to stop adding fields) []:
>
Enter the route path [/admin/config/example/exampleconfig]:
>
Generate a menu link (yes/no) [yes]:
>
A title for the menu link [ExampleConfigForm]:
> Example Config
Menu parent [system.admin_config_system]:
>
A description for the menu link [A description for the menu entry]:
> Configuration for the example module.