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can I do that?

I have a custom field ExternalID__c on custom object Master_Visit_Plan_Branch__c.. i created workflow to update the externalID everytime the parent .. (Master_Visit_Plan__c) create new record based on location,period,and PIC name..

I want to add error if I accidently type duplicate value before inserting.. The workflow works well, I cant save duplicate value, but I need some error popup to describe what happen

Using trigger???

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You can write trigger for checking duplicates,You are not getting "Popup",you will get page message

Already a lot of posts are available for duplicate triggers

check below links

https://success.salesforce.com/apex/answers?id=9063A000000DazuQAC

Trying to create a trigger to prevent creation of duplicate accounts

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