Installation
Grab in instance from https://gitlab.wikibase.nl/community/mw-wsform. Create a "FlexForm" folder in your Wiki extensions folder and extract the files there.
Setup
You can tweak FlexForm to an extent in your Localsettings.php
$FlexFormConfig['secure'] = true; //( default is true ). Will render form that make no sense when inspected in the browser
$FlexFormConfig['sec_key'] = ""; // A salt key for encryption. Used together with "secure" option. Must be set when using multiple instances of a wiki
$FlexFormConfig['auto_save_interval'] = 30000; // defaults to 3 minutes.
$FlexFormConfig['auto_save_after_change'] = 3000; // defaults to 3 seconds after last change
$FlexFormConfig['FlexFormDefaultTheme'] = "plain"; // Currently the only form
$FlexFormConfig['rc_site_key'] = ""; // reCaptcha site key
$FlexFormConfig['rc_secret_key'] = ""; // reCaptcha secret key
$FlexFormConfig['file_temp_path'] = ""; // Currently not is use.
$FlexFormConfig['form_timeout_limit'] = 7200; // 7200 seconds is the default
Finally
Add the following line at the end of your LocalSettings.php to enable the extension :
wfLoadExtension( 'FlexForm' );
Notification/Messages
FlexForm has a notification system build in. This is used to show possible errors or success / custom messages.
To enable this.. add to your header page :
<_form showmessages />