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

[TrustDec]

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...

[jayshah123]

Yes, post message seems to change location/url of the window and hence resulting in multiple calls to onLoad, is there any way to avoid this?

[reedspool]

I do not have an answer, but I have found offending code which proves the assumptions https://github.com/facebook/react-native/blob/master/ReactAndroid/src/main/java/com/facebook/react/views/webview/ReactWebViewManager.java#L578

[stale]

Hey there, it looks like there has been no activity on this issue recently. Has the issue been fixed, or does it still require the community's attention? This issue may be closed if no further activity occurs. You may also label this issue as "For Discussion" or "Good first issue" and I will leave it open. Thank you for your contributions.

[TrustDec]

Unresolved, the problem still exists

[tedscape]

The problem still exists.

[jamonholmgren]

This issue has been migrated to react-native-webview/react-native-webview#9 and can be closed.

[Titozzz]

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