Ejemplo 1: if else render reaccionar

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

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

Ejemplo 2: cómo usar if else dentro de jsx en react

renderElement(){
   if(this.state.value == 'news')
      return data;
   return null;
}

render() {
    return (   
        
            { this.renderElement() }
        
    )
}

Ejemplo 3: reaccionar renderizado condicional nativo

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

      
Hello!
      {unreadMessages.length > 0 &&
        

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

Ejemplo 4: declaración reaccionar if

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

      The user is {isLoggedIn ? 'currently' : 'not'} logged in.    
  );
}

Ejemplo 5: reacción de renderizado condicional

import React, { Component } from 'react';

// @params [] * denotes optional param (we will need to use conditional rendering for some of these)
// [type](Bulma CSS class): Hero type, focuses on the base styling
// size(Bulma CSS Class): The size of the hero, small, medium, large, etc...
// heading: The main heading
// [subheading]: The subheading if desired
// [alignment](Bulma CSS Class): Aligns the content horizontally

// This Simple HeroComponent is bases upon the following
// https://bulma.io/documentation/layout/hero/ 

export class HeroComponent extends Component
{
	render() {
		return (
          	// The following ternary simply applies a class if it has been specified
			

				

                  	// Again, another ternary applying a class... blah blah blah....
					

						
{this.props.heading}
						// So, to answer the question...
						// The following is one way to do conditional rendering, probably the simplest and cleanest
						// If this.props.subheading exists, render 

						{this.props.subheading && 
{this.props.subheading}}
					


				
			
		)
	}
}

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