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Eric VitucciEric Vitucci 

Community alerts on closed case

I want to create an alert when a customer tries to reopen a case. I have workflows and a validation rule that will not reopen a case. But I would like a reminder alert to pop up when someone clicks on the open but. Here are some images of what I am looking for.

Alert

User-added image

Not sure were to start. These are both in my instance built by developers. However I would like to try and build this on my own.
SandhyaSandhya (Salesforce Developers) 
Hi,

You may refer below blog which has the example with sample code for similar requirement that might help you to start.

https://www.salesforcetutorial.com/alert-salesforce-standardcustom-object-page-layouts/

Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution.
                                             
Best Regards
Sandhya