Communication between webviews

[cvuser0]

I haven't seen one, but is there a possibility of communication between the webviews?
The inappbrowser plugin has a form of limited communication but this plugin suits me better except the cross-webview communication.

[arturokunder]

@cvuser0 We implemented a callback that is triggered when the second webview is closed.
See #9
You can use this as an example for making a wider range for communication between other webviews,

[cvuser0]

@arturokunder that callback is triggered by the WebViewPlugin.java file, i got to the point of communicating with that file.
I am currently struggling with getting hold of the WebViewActivity and calling functions there (and calling WebViewPlugin's functions from WebViewActivity).

[AshMartian]

This would be great, currently I'm working around this by using sqlite.
https://github.com/litehelpers/Cordova-sqlite-storage

Reading in second window, writing on the original.

[AshMartian]

I attempted to implement this functionality in a fork, no success yet. I can call the events on the same webview, but they are using two different native objects hence won't share the same dictionary (iOS).
Here's what I tried (added)

webViewPlugin.js

var _sendEvent = function(event, successCallback, errorCallback) {
    cordova.exec(successCallback, errorCallback, 'WebViewPlugin', 'sendEvent', [event]);
  };

  var _subscribeEvent = function(event, successCallback, errorCallback) {
    cordova.exec(successCallback, errorCallback, 'WebViewPlugin', 'subscribeEvent', [event]);
  };

  var _unsubscribeEvent = function(event, successCallback, errorCallback) {
    cordova.exec(successCallback, errorCallback, 'WebViewPlugin', 'unsubscribeEvent', [event]);
  };

WebViewPlugin.h

@interface WebViewPlugin : CDVPlugin<WebViewDelegate>
{
  @private NSString* webViewFinishedCallBack;
  @private NSMutableDictionary* webViewEventCallbacks;
}
@property (nonatomic, retain) WebViewController* webViewController;

- (void)subscribeCallback:(CDVInvokedUrlCommand*)command;
- (void)unsubscribeEvent:(CDVInvokedUrlCommand*)command;
- (void)subscribeEvent:(CDVInvokedUrlCommand*)command;
- (void)sendEvent:(CDVInvokedUrlCommand*)command;
- (void)show:(CDVInvokedUrlCommand*)command;
- (void)hide:(CDVInvokedUrlCommand*)command;
- (void)exitApp:(CDVInvokedUrlCommand*)command;
- (void)webViewFinished;

WebViewPlugin.m

- (void)subscribeEvent:(CDVInvokedUrlCommand*)command
{
    NSString* event=(NSString*)[command.arguments objectAtIndex:0];
    @try {
        [webViewEventCallbacks setObject:command.callbackId forKey:event];
    }
    @catch (NSException *exception) {
        NSString* reason=[exception reason];
        CDVPluginResult* pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_ERROR messageAsString: reason];
        [self.commandDelegate sendPluginResult:pluginResult callbackId:command.callbackId];
    }
    NSLog(@"Subscribing to Event %@", event);
}

- (void)unsubscribeEvent:(CDVInvokedUrlCommand*)command
{
    NSString* event=(NSString*)[command.arguments objectAtIndex:0];
    @try {
        [webViewEventCallbacks removeObjectForKey:event];
    }
    @catch (NSException *exception) {
        NSString* reason=[exception reason];
        CDVPluginResult* pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_ERROR messageAsString: reason];
        [self.commandDelegate sendPluginResult:pluginResult callbackId:command.callbackId];
    }
    NSLog(@"Unsubscribing to Event %@", event);
}

- (void)sendEvent:(CDVInvokedUrlCommand*)command
{
    NSString* event=(NSString*)[command.arguments objectAtIndex:0];
    NSString* message= @"";
    if([command.arguments count] > 1) {
        message = (NSString*)[command.arguments objectAtIndex:1];
    }
    NSLog(@"Sending to Event %@", event);
    @try {
        [self.commandDelegate runInBackground:^{
            NSString *_subscribeCallbackId = [webViewEventCallbacks objectForKey: event];
            NSLog(@"Got subscribe ID %@", webViewEventCallbacks);
            CDVPluginResult *pluginResult = nil;
            pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_OK messageAsString: message];
            [pluginResult setKeepCallbackAsBool:TRUE];
            [self.commandDelegate sendPluginResult:pluginResult callbackId:_subscribeCallbackId];
        }];
        
    } @catch(NSException *exception) {
        NSString* reason=[exception reason];
        CDVPluginResult* pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_ERROR messageAsString: reason];
        [self.commandDelegate sendPluginResult:pluginResult callbackId:command.callbackId];
    }
}

Currently, when I subscribe in the second webview, then send from the original, the original does not have the same NSDictionary used and doesn't have the callbackId saved.
I don't know enough about cordova to properly address this.