Question

我想使用Facebook的建议发送和接收数据 https://facebook.github.io/react-native/docs/network.html#websocket 但是当我运行代码时，它无法导入＆＃34; WebSocket＆＃34;和应用程序崩溃。 render方法中的代码运行得很好，但我不想这样做一次又一次地渲染视图只是为了发送数据。我希望componentWillMount函数中的代码能够运行以发送和接收数据。请帮我。我会感激你的。

import React, { Component } from 'react';
import WS from 'react-native-websocket';
import { View } from 'react-native';

export default class Example extends Component {

  componentWillMount() {


const ws = new WebSocket('ws://host.com/path');

ws.onopen = () => {
  // connection opened

  ws.send('something'); // send a message
};

ws.onmessage = (e) => {
  // a message was received
  console.log(e.data);
};

ws.onerror = (e) => {
  // an error occurred
  console.log(e.message);
};

ws.onclose = (e) => {
  // connection closed
  console.log(e.code, e.reason);
};


  }

  render() {
    return (
      <View style={{ flex: 1 }}>
        <WS
          ref={ref => { this.ws = ref }}
          url="http://34.206.187.250:1880/ws/praduman"
          onOpen={() => {
            console.log('Open!')
            this.ws.send('Hello')
          }}
          onMessage={console.log}
          onError={console.log}
          onClose={console.log}
          reconnect 
        />
      </View>
    )
  }
}

Answer 1

试试这个：

import React, { Component } from 'react'
import { AppRegistry, View } from 'react-native'
import WS from 'react-native-websocket'

export default class Example extends Component {
  _onOpen() {
      console.log('Open!')
      this.ws.send('Hello')    
   }
  _onMessage(event) {
      console.log('Data',event)    
   } 
   _onError(error) {
      console.log('Error',error)   
   }
   _onClose() {
      console.log('Close!')   
   }

  render () {
    return (
      <View style={{flex: 1}}>
        <WS
          ref={ref => {this.ws = ref}}
          url="wss://echo.websocket.org/"
          onOpen={() => this._onOpen.bind(this)}
          onMessage={(event) => this._onMessage.bind(this)}
          onError={(error) => this._onError.bind(this)}
          onClose={() => this._onClose.bind(this)}
        />
      </View>
    )
  }
}

我想使用WebSockets在REACT NATIVE中发送和接收数据

1 个答案: