You can display a success message using the perch:success tag. Inside these tags can be any text, mark-up and also perch:content tags. So you can enable the administrator to update the success text.

This content will be shown when the form validates. It must be nested inside perch:form tags. If the success message is displayed then the rest of the form will not be displayed, unless the show-form attribute is set (see below).

  <perch:content id="thankyou" label="Success message" type="textarea" textile editor="markitup">

Showing the success message and the form

You can redisplay the form along with the success message by setting show-form="true" on the perch:success tag. This is useful for things like edit forms.

<perch:success show-form="true"> ... </perch:success>