Will intercept URLs called from WebView, looking for those starting with "osx" Uses selectors called through a url following the format "osx:selector:arg1:arg2:etc... (Example: "osx:beep") Requires the class to be the PolicyDelegate for the webView. Will work with any web request sent by the WebView, so in theory "<a href="osx:beep">Beep!</a>" c…

Obj-C + JS communication in WebView

/*
 Intercepts navigation actions in the html document and translates them to selectors when applicable
*/

- (void)webView:(WebView *)webView decidePolicyForNavigationAction:(NSDictionary *)actionInformation request:(NSURLRequest *)request frame:(WebFrame *)frame decisionListener:(id<WebPolicyDecisionListener>)listener
{
    NSArray *call = [[[request URL] absoluteString] componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@":"]];
    
    // Find OSX protocol.
    if ([call[0] isEqualToString:@"osx"]) {
        [listener ignore];
        
        if ([call[1] isEqualToString:@"beep"]) {
            NSBeep();
        }
   } else {[listener use];}
}

/*
 Recieves Javascript alerts.
*/

- (void)webView:(WebView *)sender runJavaScriptAlertPanelWithMessage:(NSString *)message {
  NSLog(@"%@ received %@ with '%@'", self, NSStringFromSelector(_cmd), message);
}

/*
 Helper method for running JavaScripts in a WebView
*/

- (NSString *)runWebScript:(NSString *)script inWebView:(WebView *)mWebView
{return [mWebView stringByEvaluatingJavaScriptFromString:script];}