HarmonyOS web与H5两端数据交互

应用端调用H5页面时,是否有与jsBridge 交互类似的方法，可以同时做到H5向应用端通过定义好的方法传递参数，应用端完成处理后，可以用过当前定义的方法回调传给H5端。

HarmonyOS

superinsect

2024-09-05 09:37:45

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web与H5两端数据交互可以通过建立应用侧与前端页面数据通道来实现。具体地，可以使用createWebMessagePorts()接口创建消息端口，然后在两端之间互相发送消息。这样，web和H5页面就能够进行数据交互了。

代码参考如下：

建立应用侧与前端页面数据通道：

// xxx.ets 
import web_webview from '@ohos.web.webview'; 
 
@Entry 
@Component 
struct WebComponent { 
  controller: web_webview.WebviewController = new web_webview.WebviewController(); 
  ports: web_webview.WebMessagePort[]; 
  @State sendFromEts: string = 'Send this message from ets to HTML'; 
  @State receivedFromHtml: string = 'Display received message send from HTML'; 
 
  build() { 
    Column() { 
      // 展示接收到的来自HTML的内容 
      Text(this.receivedFromHtml) 
      // 输入框的内容发送到html 
      TextInput({placeholder: 'Send this message from ets to HTML'}) 
        .onChange((value: string) => { 
          this.sendFromEts = value; 
        }) 
 
      Button('postMessage') 
        .onClick(() => { 
          try { 
            // 1、创建两个消息端口。 
            this.ports = this.controller.createWebMessagePorts(); 
            // 2、在应用侧的消息端口(如端口1)上注册回调事件。 
            this.ports.onMessageEvent((result: web_webview.WebMessage) => { 
              let msg = 'Got msg from HTML:'; 
              if (typeof(result) === 'string') { 
                console.info(`received string message from html5, string is: ${result}`); 
                msg = msg + result; 
              } else if (typeof(result) === 'object') { 
                if (result instanceof ArrayBuffer) { 
                  console.info(`received arraybuffer from html5, length is: ${result.byteLength}`); 
                  msg = msg + 'lenght is ' + result.byteLength; 
                } else { 
                  console.info('not support'); 
                } 
              } else { 
                console.info('not support'); 
              } 
              this.receivedFromHtml = msg; 
            }) 
            // 3、将另一个消息端口(如端口0)发送到HTML侧，由HTML侧保存并使用。 
            this.controller.postMessage('__init_port__', [this.ports], '*'); 
          } catch (error) { 
            console.error(`ErrorCode: ${error.code}, Message: ${error.message}`); 
          } 
        }) 
 
      // 4、使用应用侧的端口给另一个已经发送到html的端口发送消息。 
      Button('SendDataToHTML') 
        .onClick(() => { 
          try { 
            if (this.ports && this.ports) { 
              this.ports.postMessageEvent(this.sendFromEts); 
            } else { 
              console.error(`ports is null, Please initialize first`); 
            } 
          } catch (error) { 
            console.error(`ErrorCode: ${error.code}, Message: ${error.message}`); 
          } 
        }) 
      Web({ src: $rawfile('xxx.html'), controller: this.controller }) 
    } 
  } 
}
<!--xxx.html--> 
  <!DOCTYPE html> 
  <html> 
  <head> 
  <meta name="viewport" content="width=device-width, initial-scale=1.0"> 
  <title>WebView Message Port Demo</title> 
  </head> 
  <body> 
  <h1>WebView Message Port Demo</h1> 
  <div> 
  <input type="button" value="SendToEts" onclick="PostMsgToEts(msgFromJS.value);"/><br/> 
  <input id="msgFromJS" type="text" value="send this message from HTML to ets"/><br/> 
  </div> 
  <p class="output">display received message send from ets</p> 
  </body> 
  <script> 
  var h5Port; 
var output = document.querySelector('.output'); 
window.addEventListener('message', function (event) { 
  if (event.data === '__init_port__') { 
    if (event.ports !== null) { 
      h5Port = event.ports; // 1. 保存从ets侧发送过来的端口 
      h5Port.onmessage = function (event) { 
        // 2. 接收ets侧发送过来的消息. 
        var msg = 'Got message from ets:'; 
        var result = event.data; 
        if (typeof(result) === 'string') { 
          console.info(`received string message from html5, string is: ${result}`); 
          msg = msg + result; 
        } else if (typeof(result) === 'object') { 
          if (result instanceof ArrayBuffer) { 
            console.info(`received arraybuffer from html5, length is: ${result.byteLength}`); 
            msg = msg + 'lenght is ' + result.byteLength; 
          } else { 
            console.info('not support'); 
          } 
        } else { 
          console.info('not support'); 
        } 
        output.innerHTML = msg; 
      } 
    } 
  } 
}) 
 
// 3. 使用h5Port往ets侧发送消息. 
function PostMsgToEts(data) { 
  if (h5Port) { 
    h5Port.postMessage(data); 
  } else { 
    console.error('h5Port is null, Please initialize first'); 
  } 
} 
</script> 
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2024-09-05 16:05:10

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