点击时渲染新组件做出反应

Question

我正在练习做出反应并尝试通过点击按钮渲染新组件。 这里的第一页是电子邮件，我要渲染的组件包含密码页面。

  class App extends React.Component { passwordpage(){ return( <form> <div className="mainapp"> <h2> Password</h2> <input type='Password' className="inputpassword" placeholder='Enter Password' required/> <div> <button type="submit" className="loginbutton">Next</button> </div> </div> </form> ); }; render() { return ( <form> <div className="mainapp"> <h2>Email Id</h2> <input type='email' ref='enteremail'className="inputemail" placeholder='Enter Username' required/> <div> <button type="submit" onClick={this.props.passwordpage} className="loginbutton">Next</button> </div> </div> </form> ); } } ReactDOM.render(<App/>,document.getElementById('app')); 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.14.8/react.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.14.8/react-dom.min.js"></script> <div id="app"></div> 

Answer 1

最简单的方法是在render()准备好密码页面，并根据组件状态显示/隐藏它，这是由onClick处理程序改变的，沿着这些行：

showPasswordPage() {
  this.setState({showPassword: true });
}

render() {
  const passwordPage = (<form>
    <div className="mainapp">
      <h2> Password</h2>
      <input type='Password' className="inputpassword" placeholder='Enter Password' required/>
      <div>
        <button type="submit" className="loginbutton">Next</button>
      </div>
    </div>
  </form>);

  const mainForm = (<form>
    <div className="mainapp">
      <h2>Email  Id</h2>
      <input type='email' ref='enteremail'className="inputemail" placeholder='Enter Username' required/>
      <div>
        <button type="submit" onClick={this.showPasswordPage} className="loginbutton">Next</button>
      </div>
    </div>
  </form>);

  return { this.state.showPassword ? passwordPage : mainForm };

Answer 2

我通常会在状态中保留一些变量，并根据用户操作更改它们。

所以在你的情况下我已经存储了当前的活动页面，例如usernamePage ，当用户点击下一个时，我在你的情况下显示另一个页面是passwordPage 。

 class App extends React.Component { constructor(props) { super(props); this.state = { isPasswordPage : false, isUsernamePage : true, username : "", password : "" }; this.enablePasswordPage = this.enablePasswordPage.bind(this); } enablePasswordPage() { this.setState({ isPasswordPage : true, isUsernamePage : false }); } passwordpage(){ return( <form> <div className="mainapp"> <h2> Password</h2> <input type='Password' className="inputpassword" placeholder='Enter Password' required/> <div> <button type="submit" className="loginbutton">Next</button> </div> </div> </form> ); }; render() { var usernameComp = ( <form> <div className="mainapp"> <h2>Email Id</h2> <input type='email' ref='enteremail'className="inputemail" placeholder='Enter Username' required/> <div> <button onClick={this.enablePasswordPage} className="loginbutton">Next</button> </div> </div> </form> ); return ( <div> { this.state.isUsernamePage ? usernameComp : null } { this.state.isPasswordPage ? this.passwordpage() : null } </div> ); } } ReactDOM.render(<App/>,document.getElementById('app')); 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.14.8/react.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.14.8/react-dom.min.js"></script> <div id="app"></div> 

Answer 3

您需要做的是使用react-router ，然后为要显示的每个页面创建单独的组件。 这是实现您想要做的事情的最佳方式。

你的组件看起来像

class Home extends React.Component {
    render() {
    return (
        <div>{this.props.children}</div>
    )
  }
}

class App extends React.Component {

  handleClick = (e) => {
     e.stopPropagation();
     browserHistory.push('/passwordPage');
  }
  render() {
    return (
      <form>
        <div className="mainapp">
          <h2>Email  Id</h2>
          <input type='email' ref='enteremail'className="inputemail" placeholder='Enter Username' required/>
          <div>
            <button className="loginbutton" onClick={this.handleClick}>Next</button>
          </div>
        </div>
      </form>

    );
  }
}

class PasswordPage extends React.Component {
    render() {
    return (
        <form>
        <div className="mainapp">
          <h2> Password</h2>
          <input type='Password' className="inputpassword" placeholder='Enter Password' required/>
          <div>
            <button type="submit" className="loginbutton">Next</button>
          </div>
        </div>
      </form>
    )
  }
}

ReactDOM.render(
   <Router history={browserHistory}>
   <Route path="/" component={Home}>
    <IndexRoute component={App} />
    <Route path="/passwordPage" component={PasswordPage} />
   </Route>
   </Router>
)

请看这里的react-router文档