React

by gergana

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/react-router/5.0.0/react-router.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-router-dom/5.0.0/react-router-dom.min.js"></script>
<div id="app"></div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
  height: 100%;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
  height: 100%;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

.done {
  color: rgba(0, 0, 0, 0.3);
  text-decoration: line-through;
}

input {
  margin-right: 5px;
}

React

import { NavLink, Switch, Route } from 'react-router-dom';

const Login = () => {
	return (<p>Login</p>);
}

const Home = () => {
	return (<p>Home</p>);
}

class Navbar extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
    	isLoginPageOn: false,
    }
  }
  
  componentWillReceiveProps(nextProps) {
    if (this.props.location.pathname !== nextProps.location.pathname) {
      if (nextProps.location.pathname === '/login') {
        this.setState({ isloginPageOn: true });
      } else {
        this.setState({ isloginPageOn: false });
      }
    }
	}
  
  render() {
    const isloginPageOn = this.state.isloginPageOn;
    let navlink;
  	console.log(isloginPageOn)
    if (isloginPageOn) {
      navlink = <NavLink to='/' className="rightButton">Strona główna</NavLink>;
    } else {
      navlink = <NavLink to='/login' className="rightButton">Logowanie</NavLink>;
    }

    return (
      <div className="topnav">
        {navlink}
      </div>
    )

  }
}


class App extends React.Component {
	render() {
  	return(
    	<Navbar/>
      <Switch>
        <Route to='/' component={Home} />
        <Route to='/login' component={Login} />
      </Switch>
    )
  }
}
ReactDOM.render(<App />, document.querySelector("#app"))