An in-depth analysis of the basic interaction between React Native and the web (with code)-JS Tutorial-php.cn

Home

Web Front-end

JS Tutorial

An in-depth analysis of the basic interaction between React Native and the web (with code)

奋力向前

Aug 17, 2021 am 11:04 AM

h5jsreact

In the previous article "Teach you how to use css3 to add gradient effects to images (detailed code explanation)", I introduced how to use css3 to add gradient effects to images. The following article will introduce you to the basic interaction between React Native and the web. It has certain reference value and friends in need can refer to it.

Interaction between React Native and H5

//接收来自H5的消息
onMessage = (e) => {
  Log("WebView onMessage 收到H5参数：", e.nativeEvent.data);
  let params = e.nativeEvent.data;
  params = JSON.parse(params);
  Log("WebView onMessage 收到H5参数 json后：", params);
};

onLoadEnd = (e) => {
  Log("WebView onLoadEnd e：", e.nativeEvent);
  let data = {
    source: "from rn",
  };
  this.web && this.web.postMessage(JSON.stringify(data)); //发送消息到H5
};
<WebView
  ref={(webview) => {
    this.web = webview;
  }}
  style={{
    width: "100%",
    height: "100%",
    justifyContent: "center",
    alignItems: "center",
  }}
  source={require("../data/testwebview.html")}
  onLoadEnd={this.onLoadEnd} //加载成功或者失败都会回调
  onMessage={(e) => this.onMessage(e)}
  javaScriptEnabled={true} //指定WebView中是否启用JavaScript
  startInLoadingState={true} //强制WebView在第一次加载时先显示loading视图
  renderError={(e) => {
    return <View />;
  }}
/>;

Interaction between H5 and React Native

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>text webview</title>
    <script type="application/javascript">
      //相互通信只能传递字符串类型
      function test() {
        //发送消息到rn
        let params = {
          msg: "h5 to rn",
          source: "H5",
        };
        window.postMessage(JSON.stringify(params)); //发送消息到rn
      }

      window.document.addEventListener("message", function (e) {
        //注册事件 接收数据
        const message = e.data; //字符串类型
        console.log("WebView message:", message);
        window.postMessage(message);
      });
    </script>
  </head>
  <body>
    <h1 id="chuchur">chuchur</h1>
    <button onclick="test()">单击</button>
  </body>
</html>

Notes

If your WebView is quoted from react-native. H5To send a message to RN, use window.postMessage(message)In order to reduce the surface area of React Native, it will be removed from React Native is deleted from the core, it is recommended to use

import { WebView } from "react-native"; //会被移除
//to
import { WebView } from "react-native-webview";

If it is introduced with react-native-webview, the communication method is window.ReactNativeWebView.postMessage(message)

For more information, please read the proposals at https://github.com/react-native-community/discussions-and-proposals/issues/6.

Native call H5 method

[wkWebView evaluateJavaScript:@"js方法名()" completionHandler:^(id _Nullable response, NSError * _Nullable error) {
    if (!error) { // 成功
       NSLog(@"%@",response);
    } else { // 失败
        NSLog(@"%@",error.localizedDescription);
    }
}];

H5 call native method

 //App端：
  // 1. WKWebView注入ScriptMessageHandler
 [wkWebView.configuration.userContentController addScriptMessageHandler:(id <WKScriptMessageHandler>)scriptMessageHandler name:@"xxx"];
  // 2. 提供setWebViewAppearance方法，这样就能反射出H5即将传来的字符串@"setWebViewAppearance"
  - (void)setWebViewAppearance {

  }

//H5端：
  // 1. 获取handler
  var handler = {
    callHander: function (json) {
    if (/(iPhone|iPad|iPod|iOS)/i.test(navigator.userAgent)) {//ios
        window.webkit.messageHandlers.xxx.postMessage(JSON.stringify(json))
    }
    if (/(Android)/i.test(navigator.userAgent)) { //Android
        window.xxx.postMessage(JSON.stringify(json));
    }
  }
  // 2. 设置调用App方法所需要的传出的参数（这里是json格式）
  function setAppAppearance(){
    handler.callHander({
        &#39;body&#39;:"setWebViewAppearance",
        &#39;buttons&#39;: [
            {
                "text":"分享",
                "action":""
            }
        ],
        &#39;title&#39;:"这是webView的标题"
    });
  }
  // 3. H5调用自己的设置方法,继而调用了原生客户端的方法
  setAppAppearance();

Prompt error:

WKJavaScriptExceptionMessage=ReferenceError: Can&#39;t find variable xxx
需要方法需要挂在 window 上 window.xxx = function() {}
for vue, mounted: window.xxx =this.xxx

Recommended learning: React video tutorial

The above is the detailed content of An in-depth analysis of the basic interaction between React Native and the web (with code). For more information, please follow other related articles on the PHP Chinese website!

Statement

This article is reproduced at:禅境花园. If there is any infringement, please contact admin@php.cn delete

Java vs JavaScript: A Detailed Comparison for DevelopersMay 16, 2025 am 12:01 AM

JavaandJavaScriptaredistinctlanguages:Javaisusedforenterpriseandmobileapps,whileJavaScriptisforinteractivewebpages.1)Javaiscompiled,staticallytyped,andrunsonJVM.2)JavaScriptisinterpreted,dynamicallytyped,andrunsinbrowsersorNode.js.3)JavausesOOPwithcl

Javascript Data Types : Is there any difference between Browser and NodeJs?May 14, 2025 am 12:15 AM

JavaScript core data types are consistent in browsers and Node.js, but are handled differently from the extra types. 1) The global object is window in the browser and global in Node.js. 2) Node.js' unique Buffer object, used to process binary data. 3) There are also differences in performance and time processing, and the code needs to be adjusted according to the environment.

JavaScript Comments: A Guide to Using // and /* */May 13, 2025 pm 03:49 PM

JavaScriptusestwotypesofcomments:single-line(//)andmulti-line(//).1)Use//forquicknotesorsingle-lineexplanations.2)Use//forlongerexplanationsorcommentingoutblocksofcode.Commentsshouldexplainthe'why',notthe'what',andbeplacedabovetherelevantcodeforclari

Python vs. JavaScript: A Comparative Analysis for DevelopersMay 09, 2025 am 12:22 AM

The main difference between Python and JavaScript is the type system and application scenarios. 1. Python uses dynamic types, suitable for scientific computing and data analysis. 2. JavaScript adopts weak types and is widely used in front-end and full-stack development. The two have their own advantages in asynchronous programming and performance optimization, and should be decided according to project requirements when choosing.

Python vs. JavaScript: Choosing the Right Tool for the JobMay 08, 2025 am 12:10 AM

Whether to choose Python or JavaScript depends on the project type: 1) Choose Python for data science and automation tasks; 2) Choose JavaScript for front-end and full-stack development. Python is favored for its powerful library in data processing and automation, while JavaScript is indispensable for its advantages in web interaction and full-stack development.

Python and JavaScript: Understanding the Strengths of EachMay 06, 2025 am 12:15 AM

Python and JavaScript each have their own advantages, and the choice depends on project needs and personal preferences. 1. Python is easy to learn, with concise syntax, suitable for data science and back-end development, but has a slow execution speed. 2. JavaScript is everywhere in front-end development and has strong asynchronous programming capabilities. Node.js makes it suitable for full-stack development, but the syntax may be complex and error-prone.

JavaScript's Core: Is It Built on C or C ?May 05, 2025 am 12:07 AM

JavaScriptisnotbuiltonCorC ;it'saninterpretedlanguagethatrunsonenginesoftenwritteninC .1)JavaScriptwasdesignedasalightweight,interpretedlanguageforwebbrowsers.2)EnginesevolvedfromsimpleinterpreterstoJITcompilers,typicallyinC ,improvingperformance.

JavaScript Applications: From Front-End to Back-EndMay 04, 2025 am 12:12 AM

JavaScript can be used for front-end and back-end development. The front-end enhances the user experience through DOM operations, and the back-end handles server tasks through Node.js. 1. Front-end example: Change the content of the web page text. 2. Backend example: Create a Node.js server.

See all articles