add appreciation after form submit

Hello All
I'm working as front end, but I need simple feature added to website, when user click in button submit form then I want to shoe appreciation after submit.

Can anyone help me what is the name of the process so I can search more in related topic that I mention above. or can you give me resources help me about this features.
All I need some resource help me how implement this.

Thank you for your help from now!!

Comments

[Nick Brunner]

By appreciation, I assume you mean to show a toast or pop-up of some kind. This could be called in whatever submit method is called on button click.