What's the best practice for screen navigation after invalid user input?

Published: 17/11/2019
What's the best practice for screen navigation after invalid user input?
Source: UX.STACKEXCHANGE.COM

Consider an Angular app with many user inputs over screens A, B and C. Screen C needs valid inputs from A and B; B from A only; and A is independent. Suppose while on screen B the user enters invalid inputs. Question: What navigation should I support for B in this case? My current thinking is to disallow navigation to C due to data validity issues. But what about navigating back to B? On the one h

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