How to pass state back to parent in React?
问题 I have a form that has a submit button. That form calls a function onclick that sets the state of something from false to true. I then want to pass this state back to the parent so that if it is true it renders componentA but if it is false it renders componentB. How would I do that in react? I know I need to use state or props but not sure how to do it. also is this contradicting the one-way flow react principle?? ComponentA code: <form onSubmit={this.handleClick}> handleClick(event) { this