在React Native中更新WebView Javascript [英] Updating WebView Javascript in React Native

问题描述

我无法根据React Native中的用户输入更新我的WebView值。我正在尝试使用D3.js在WebView中制作图表，并且显示的图表取决于用户输入。
这是我的问题的一个例子，单击的HTML时间没有被更新。我曾尝试在webview ref上使用.reload（），但这只是给了我一个空白的html。

I'm having trouble updating my WebView values based on user input in React Native. I'm trying to make charts in WebView using D3.js, and the chart displayed is depending on user input. Here is an example of my problem, the HTML times clicked is not being updated. I have tried using .reload() on webview ref also, but this just gives me a blank html instead.

    // @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,
}
});

推荐答案

我能够使用消息来代替注入JavaScript的。我想推荐人们只使用胜利图表等库，或者使用react-art来渲染svg路径，因为webviews对于这类问题（React Native中的d3图表）并不是最佳选择。

I was able to do this using messages instead of injected javascript. I would like to recommend people to just use a library such as victory-charts or use react-art to render svg paths instead, as webviews are just not optimal for this type of problem (d3 charts in React Native).

    // @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,
}
});

这篇关于在React Native中更新WebView Javascript的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！