在React Native中更新WebView Javascript

Question

我在根據React Native中的用戶輸入更新我的WebView值時遇到問題。 我正在嘗試使用D3.js在WebView中創建圖表，並且顯示的圖表取決於用戶輸入。 以下是我的問題示例，單擊的HTML時間未更新。 我也試過在webview ref上使用.reload（），但這只是給了我一個空白的html。

    // @flow
'use strict';
import React, { Component } from 'react';
import {
  StyleSheet,
  View,
  Image,
  Text,
  TouchableHighlight,
  WebView
} from 'react-native';

export default class WebViewTest extends Component {

  constructor(props) {
    super(props);
    this.state = {
    timesClicked : 0
  };
  this._onPressButton = this._onPressButton.bind(this);
  this.generateJSCode = this.generateJSCode.bind(this);
  }

  _onPressButton() {
    let timesClicked = this.state.timesClicked++;
    console.log(timesClicked + " Clicked ");
    this.setState({
      timesClicked: this.state.timesClicked++
    });
  }

  generateJSCode() {
    console.log("Times clicked: " + this.state.timesClicked);
    let jsCode = `document.getElementById("content").innerHTML = "HTML Times clicked: ${this.state.timesClicked}";`;
    return jsCode;
  }

  render() {
    let html = `
        <div id="content">
            This is my name
        </div>
    `;

    return (
        <View style={styles.container}>
          <TouchableHighlight onPress={this._onPressButton}>
            <Text>Press me to increase click</Text>
          </TouchableHighlight>
          <Text>React Native times clicked: {this.state.timesClicked}</Text>
            <WebView
                style={styles.webView}
                source={{html : html}}
                injectedJavaScript={this.generateJSCode()}
                javaScriptEnabledAndroid={true}
            >
            </WebView>
        </View>
    );
  }
}

let styles = StyleSheet.create({
container: {
    flex: 1,
    backgroundColor: '#fff',
    margin: 30
},
webView: {
    backgroundColor: '#fff',
    height: 350,
}
});

Answer 1

我能夠使用消息而不是注入javascript來做到這一點。 我想建議人們只使用像勝利圖表這樣的庫，或者使用react-art來渲染svg路徑，因為webview對於這類問題來說並不是最佳的（React Native中的d3圖表）。

    // @flow
'use strict';
import React, { Component } from 'react';
import {
  StyleSheet,
  View,
  Image,
  Text,
  TouchableHighlight,
  WebView
} from 'react-native';

export default class WebViewTest extends Component {

  constructor(props) {
    super(props);
    this.state = {
    timesClicked : 0
  };
  this._onPressButton = this._onPressButton.bind(this);
  }

  _onPressButton() {
    let timesClicked = this.state.timesClicked;
    timesClicked++;
    console.log(timesClicked + " Clicked ");
    this.setState({
      timesClicked: timesClicked
    });
    this.refs.myWebView.postMessage("This is my land times " + timesClicked);
  }

  render() {
    let html = `
        <div id="content">
            This is my name
        </div>
        <script>
          document.addEventListener('message', function(e) {
            document.getElementById("content").innerHTML = e.data;
          });
        </script>
    `;

    return (
        <View style={styles.container}>
          <TouchableHighlight onPress={this._onPressButton}>
            <Text>Press me to increase click</Text>
          </TouchableHighlight>
          <Text>React Native times clicked: {this.state.timesClicked}</Text>
            <WebView
                style={styles.webView}
                source={{html : html}}
                ref="myWebView"
                javaScriptEnabledAndroid={true}
                onMessage={this.onMessage}
            >
            </WebView>
        </View>
    );
  }
}

let styles = StyleSheet.create({
container: {
    flex: 1,
    backgroundColor: '#fff',
    margin: 30
},
webView: {
    backgroundColor: '#fff',
    height: 350,
}
});