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Validating user inputs

Validating user inputs - Flutter Tutorial

From the course: Flutter Essential Training: Build for Multiple Platforms

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Validating user inputs

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- [Instructor] Building a text field was definitely easy in Flutter. However, our work is not done yet. What if the user is typing some faulty inputs? Like you have a field that takes an email ID, then you must verify that the input has an at character like @gmail.com, or the username or password is less than five characters which your system does not allow maybe. Now in such cases, you want to throw an error. So suppose you have a validation logic in your login user function right here. So you check that username.controller.text.length because you want to check if the length is less than five characters. Then we throw some errors. You can do the exact same thing for password here. Just make this password controller. Now, if there are more validation checks you need to add, the permutation and combination of this if, else checks will be a lot and there will be duplicated errors popping up on the screen. What we want…

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