Error message in an Apex Trigger

Question

I want to display an error message using apex trigger and display a list with bullets beside it, like

• record name 1
• record name 2

in the error message.

Is this possible with a trigger?

addError() is showing error only for one record, I want to display list of all.

Answer 1

You could call addError()on each record, but that would give you multiple messages instead of the bullet list you want. There is an overloaded form of the addError method that can display your error with un-escaped markup though that might get you what you want. Basically, you could build up an html formatted string with all the content you want to display, then call addError(errString, false)