What are the different rendering methods of react?

React rendering methods include: 1. Rendering using conditional expressions, suitable for rendering of two components; 2. Rendering using the "&&" operator, suitable for rendering with or without a component; 3. , Use variable output components for rendering; 4. Use functional methods to output components or use functional components for rendering.

The operating environment of this tutorial: Windows7 system, react17.0.1 version, Dell G3 computer.

Several ways to conditionally render React components

1. Conditional expression rendering (applicable to two components Rendering of one of the two)

render() {
  const isLoggedIn = this.state.isLoggedIn;
  return (
    

      {isLoggedIn ? (
        
      ) : (
        
      )}
    
  );
}

2. && operator rendering (applicable to rendering with or without a component)

function Mailbox(props) {
  const unreadMessages = props.unreadMessages;
  return (
    

      
Hello!
      {unreadMessages.length > 0 &&
        

          You have {unreadMessages.length} unread messages.
        
      }
    
  );
}

3. Use variables to output component rendering (suitable for rendering under multiple components and under various conditions)

render() {
    const isLoggedIn = this.state.isLoggedIn;
 
    const button = isLoggedIn ? (
      
    ) : (
      
    );
 
    return (
      

        
        {button}
      
    );
  }

4. Use functional methods to output components or use functional components for rendering ( Suitable for situations where multiple sub-components need to be output based on complex conditions)

1. Functional approach

renderButton(){
    const isLoggedIn = this.state.isLoggedIn;
    if(isLoggedIn)
    {
       return ();
    }
    else
    {
      return ();
    }
}
 
render() {
    return (
      

        
        {this.renderButton()}
      
    );
  }

2. Functional component

function Greeting(props) {
  const isLoggedIn = props.isLoggedIn;
  if (isLoggedIn) {
    return ;
  }
  return ;
}
 
ReactDOM.render(
  // Try changing to isLoggedIn={true}:
  ,
  document.getElementById('root')
);

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