/Javascript/React/React native conditional rendering

React native conditional rendering

function Mailbox(props) {
  const unreadMessages = props.unreadMessages;
  return (
    <div>
      <h1>Hello!</h1>
      {unreadMessages.length > 0 &&
        <h2>
          You have {unreadMessages.length} unread messages.
        </h2>
      }
    </div>
  );
}

Source: reactjs.org

React if statement

render() {
  const isLoggedIn = this.state.isLoggedIn;
  return (
    <div>
      The user is <b>{isLoggedIn ? 'currently' : 'not'}</b> logged in.    </div>
  );
}

Source: reactjs.org

Conditional Rendering in React js

function UserGreeting(props) {
  return <h1>Welcome back!</h1>;
}

function GuestGreeting(props) {
  return <h1>Please sign up.</h1>;
}

function Greeting(props) {
  const isLoggedIn = props.isLoggedIn;
  if (isLoggedIn) {
    return <UserGreeting />;
  }
  return <GuestGreeting />;
}

ReactDOM.render(
  // Try changing to isLoggedIn={true}:
  <Greeting isLoggedIn={false} />,
  document.getElementById('root')
);

Source: reactjs.org

Similar codes

21 votes124 views3 answers
Map function in react
Javascript React
5 votes127 views1 answer
Redirect in netlify react
Javascript React
12 votes250 views1 answer
React chrome extension
Javascript React
-2 votes125 views1 answer
How to get country code in react native
Javascript React
-2 votes142 views1 answer
Keyboard close when typing react native
Javascript React
1 vote123 views1 answer
React emoji picker
Javascript React
6 votes124 views1 answer
React state management
Javascript React
0 vote137 views1 answer
Change candle color react highcharts
Javascript React
24 votes157 views6 answers
Proptypes react
Javascript React
-1 vote128 views1 answer
Moment in react native
Javascript React