/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

1 vote304 views2 answers
Yarn react native cli
Javascript React
112 votes376 views10 answers
React
Javascript React
0 vote341 views1 answer
React throttle render
Javascript React
0 vote423 views1 answer
How to set the id attr to a var in reactjs
Javascript React
0 vote379 views1 answer
How to made disktop program on react website
Javascript React
0 vote335 views1 answer
React navbar material ui
Javascript React
0 vote308 views1 answer
React-chartjs-2
Javascript React
6 votes289 views3 answers
React native vector icons not working
Javascript React
0 vote332 views1 answer
React native navigation shared element
Javascript React
-5 votes318 views3 answers
Use ref in component reactjs
Javascript React