if statement inside html react code example

Example 1: if else render react

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

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

Example 2: how to use if else inside jsx in react

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

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

Example 3: make a if in jsx

var loginButton;
if (loggedIn) {
  loginButton = ;
} else {
  loginButton = ;
}

return (
  
);

Example 4: conditional rendering react

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

      
Hello!
      {unreadMessages.length > 0 &&        
          You have {unreadMessages.length} unread messages.        
      }    
  );
}

const messages = ['React', 'Re: React', 'Re:Re: React'];
ReactDOM.render(
  ,
  document.getElementById('root')
);