getElementById react-native

Question

如何獲取react-native中的元素？

我的用例是一個登錄屏幕。提交按鈕被按下，現在我想要獲取用戶名和密碼TextInputs的值。

 export default class Login extends Component 
     { 
     login() 
     { 
      //document.getElementById('username'); //run-time error 
     } 
     render() 
     { 
      return (

      <View style={{flex: 1,flexDirection: 'column',justifyContent: 'space-between',margin:10}}> 
       <View style={{backgroundColor: 'powderblue'}} /> 
       <MyTextField id='user' placeholder="User Name" /> 
       <MyTextField id='pass' placeholder="Password" /> 
       <MyButton onPress={this.login} title='Login'/> 
      </View> 

     ); 
     } 
     } 

Answer 1

你沒有得到getElementById在反應原生，你必須使用狀態。你可以這樣做：

export default class Login extends Component { 

     constructor (props) { 
      super(props); 
      this.state={ 
       email:'', 
       password:'' 
      } 
      this.login = this.login.bind(this); // you need this to be able to access state from login 
     } 

     login() { 
      console.log('your email is', this.state.email); 
      console.log('your password is', this.state.password); 
     } 

     render() { 
      return (
      <View style={{flex: 1,flexDirection: 'column',justifyContent: 'space-between',margin:10}}> 
       <View style={{backgroundColor: 'powderblue'}} /> 
       <TextInput onChangeText={(email) => { 
      this.setState({email})/> 
       <TextInput secureTextEntry={true} onChangeText={(password) => { 
      this.setState({password})/> 
       <MyButton onPress={this.login} title='Login'/> 
      </View> 
     ); 
     } 
     }