The use of postMessage will lead to WebView onLoadStart run Twice,

Is this a bug report?

Yes

Have you read the Contributing Guidelines?

Yes

Environment

OS: macOS Sierra 10.12.6 Node: v7.10.0 Yarn: 0.27.5 npm: 4.2.0 Watchman: 4.7.0 Xcode: Xcode Version 9.1 beta (9B37) Android Studio: 2.3 react-native: 0.48.4 react: 16.0.0-alpha.12 Target Platform: iOS (8-11.1) android(4.4.4-8.0)

Steps to Reproduce

messtest = e => {
  const message = e.nativeEvent.data
  alert(message)
}

<WebView
  ref={w => this.webview = w}
  source={{uri:jumpUrl}}
  onMessage={this.messtest}
  domStorageEnabled={true}
  javaScriptEnabled={true}
  startInLoadingState={true}
  dataDetectorTypes="none"
  onLoadEnd={()=>{
    console.log('load end... onLoadEnd function');
  }}
  onLoadStart={()=>{
    console.log('load start..');
  }}
  renderLoading={this._renderLoading}
  //onNavigationStateChange={this.onNavigationStateChange}
/>

Expected Behavior

LoadStart should be executed before loadEnd,As you can see from the diagram, load end... re executes load start , and then does not execute load end, which causes the state to be updated. It has always been load start

[jojol]

same issue, received duplicate message…

[Titozzz]

Closing in favor of new repo. Please keep discussing there 🚀