Condition

  1. If user can’t input e-mail address the login button should be hidden.

N.B: User have to must type a valid email address. Ex. ([email protected]), If email not valid the button not visible.

  1. After show login button user must have to type a password for login, otherwise it’s give another error called “Enter your password”.

N.B: Password leanth must be 8 digit or more otherwise can’t able to login.

  1. When both conditions are true than user can able to login.

Example

GitHub

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