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    <p>I have now found one way using the script debugger hooks in WebView (note, NOT UIWebView). I first had to subclass UIWebView and add a method like this:</p> <pre><code>- (void)webView:(id)webView windowScriptObjectAvailable:(id)newWindowScriptObject { // save these goodies windowScriptObject = newWindowScriptObject; privateWebView = webView; if (scriptDebuggingEnabled) { [webView setScriptDebugDelegate:[[YourScriptDebugDelegate alloc] init]]; } } </code></pre> <p>Next you should create a YourScriptDebugDelegate class that contains methods like these:</p> <pre><code>// in YourScriptDebugDelegate - (void)webView:(WebView *)webView didParseSource:(NSString *)source baseLineNumber:(unsigned)lineNumber fromURL:(NSURL *)url sourceId:(int)sid forWebFrame:(WebFrame *)webFrame { NSLog(@"NSDD: called didParseSource: sid=%d, url=%@", sid, url); } // some source failed to parse - (void)webView:(WebView *)webView failedToParseSource:(NSString *)source baseLineNumber:(unsigned)lineNumber fromURL:(NSURL *)url withError:(NSError *)error forWebFrame:(WebFrame *)webFrame { NSLog(@"NSDD: called failedToParseSource: url=%@ line=%d error=%@\nsource=%@", url, lineNumber, error, source); } - (void)webView:(WebView *)webView exceptionWasRaised:(WebScriptCallFrame *)frame sourceId:(int)sid line:(int)lineno forWebFrame:(WebFrame *)webFrame { NSLog(@"NSDD: exception: sid=%d line=%d function=%@, caller=%@, exception=%@", sid, lineno, [frame functionName], [frame caller], [frame exception]); } </code></pre> <p>There is probably a large runtime impact for this, as the debug delegate can also supply methods to be called for entering and exiting a stack frame, and for executing each line of code.</p> <p>See <a href="http://www.koders.com/noncode/fid7DE7ECEB052C3531743728D41A233A951C79E0AE.aspx" rel="noreferrer">http://www.koders.com/noncode/fid7DE7ECEB052C3531743728D41A233A951C79E0AE.aspx</a> for the Objective-C++ definition of WebScriptDebugDelegate.</p> <p>Those other methods:</p> <pre><code>// just entered a stack frame (i.e. called a function, or started global scope) - (void)webView:(WebView *)webView didEnterCallFrame:(WebScriptCallFrame *)frame sourceId:(int)sid line:(int)lineno forWebFrame:(WebFrame *)webFrame; // about to execute some code - (void)webView:(WebView *)webView willExecuteStatement:(WebScriptCallFrame *)frame sourceId:(int)sid line:(int)lineno forWebFrame:(WebFrame *)webFrame; // about to leave a stack frame (i.e. return from a function) - (void)webView:(WebView *)webView willLeaveCallFrame:(WebScriptCallFrame *)frame sourceId:(int)sid line:(int)lineno forWebFrame:(WebFrame *)webFrame; </code></pre> <p>Note that this is all hidden away in a private framework, so don't try to put this in code you submit to the App Store, and be prepared for some hackery to get it to work.</p>
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    1. POHow can my iPhone Objective-C code get notified of Javascript errors in a UIWebView?
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    1. USRobert Sanders
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    1. COI tried to subclass UIWebView and add the webView:windowScriptObjectAvailable method as you described, but it never gets called. This is with the iphone 3.0 SDK. Does this not work anymore or am I doing something wrong?
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    2. COI tried this on iphone and it works great. But, it seems that only handled exceptions are raised. It may not be helpful if unhandled exceptions passed away.
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    3. COim using exceptionWasRaised in the delegate and iterate over frame caller. but they all have functionName returns null. Any idea?
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