How will I get a textboxes values in react js

You can solve your problem 2 ways:

First, you can create 2 seperate onChange methods to update your username/password state

or, even better : add name tag to your form inputs:

name = userName

in your username input and

name = password

for password input.

Then make a method that triggers after onChange Event

function example(e){
   this.setState({
   [e.target.name] : [e.target.value]
  })
}

Make sure that names of your username and password forms are the same as attributes in your state.

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