react render if code example

Example 1: ternary operator react

render () {
  return (
    <div className="row">
      { //Check if message failed
        (this.state.message === 'failed')
          ? <div> Something went wrong </div> 
          : <div> Everything in the world is fine </div> 
      }
    </div>
  );
}

Example 2: if else render react

render() {
  const isLoggedIn = this.state.isLoggedIn;
  return (
    <div>
      {isLoggedIn ? (
        <LogoutButton onClick={this.handleLogoutClick} />
      ) : (
        <LoginButton onClick={this.handleLoginClick} />
      )}
    </div>
  );
}

Example 3: how to use if else inside jsx in react

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

render() {
    return (   
        <View style={styles.container}>
            { this.renderElement() }
        </View>
    )
}

Example 4: react native conditional rendering

class Component extends React.Component {
	const a = true
	render() {
      return (
    	<Container>
          {a == true
           ? (<Button/>)
           : null
          }
        </Container>    	
	  )
	}
}

This is staying: if a == true, render a button component. 
Otherwise render null, in other words nothing.

Example 5: 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>
  );
}

Example 6: inline if in html component

Condition ? Block_For_True : Block_For_False