I have a requirement like this.
I have a SharePoint list named 'Examdate' which stores different CoursNumber, Semester and ExamDate. It uses an InfoPath form for entering the CoursNumber in the list.
Now they need to have a mechanism to find out if the user is adding a New ExamDate whose CoursNumber is already present. They don't want the users to stop the adding process, but instead, want to display the ExamDate for this already existing CoursNumber in the form. This should not happen on the save button.
So, I was thinking of customizing the
NewItem form by adding a button near the CoursNumber field, say "Check Existence", and check if the CoursNumber and Semester exists by that number entered by the user. But I dont know how I can implement this.
What’s the best and simplest way I can do that?