When a page is loaded and you want to pre-filled some field value and can also run a workflow to update value, show, hide, disable and enable field.
There is two ways to pre-filled a value:
1. Use a initial field value in field properties in the form builder (the feature will be added in the next update of plugin).
2. Use the parameter in the URL.
2. Parameter in the URL: website_url?field_api_name=field_value
Workflow action for on form load: on a form load while created or edited following action are available.
1. Field value update