[SOLVED] PhoneGapDelegate::shouldStartLoadWithRequest: Received Unhandled URL about:blank

Posted by on May 28, 2012 in Mobile & Apps, Web Development | No Comments

Using ChildBrowser with PhoneGap on iOS: On iOS, the web view that PhoneGap provides doesn’t handle about:blank. After updating Xcode and iOS 5.1 SDK I began receiving the following error when I launched a browser on my actual device:

PhoneGapDelegate::shouldStartLoadWithRequest: Received Unhandled URL about:blank

Thanks to <a href=”http://www.jamesjoycewaskorean.com/#20110908150931″>James Joyce</a> for this fix:

The fix is twofold and will work for other plugins requiring about:blank too!

1) Create a file in the www folder called blank.html containing the markup below.

<html>
<body>
</body>
</html>

Next, in AppDelegate.m in your Xcode project, find the following method.

- (BOOL)webView:(UIWebView *)theWebView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
        return [ super webView:theWebView shouldStartLoadWithRequest:request navigationType:navigationType ];
}

“This method is where one is able to rewrite requests on their way through. To rewrite about:blank to point to the blank.html file, it is first necessary to find the path to the www folder and thus to blank.html”

Replace that method with this:

- (BOOL)webView:(UIWebView *)theWebView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
        NSURLRequest* req = request;

        if ([[[request URL] absoluteString] isEqualToString: @"about:blank"]) {
                NSLog(@"Rewriting about:blank");
                NSString* app = [[NSBundle mainBundle] resourcePath];
                NSString* blankpath = [NSString stringWithFormat: @"%@/www/blank.html", app];
                NSURL* blankurl = [NSURL fileURLWithPath:blankpath];

                req = [NSURLRequest requestWithURL: blankurl];
        }

        return [ super webView:theWebView shouldStartLoadWithRequest:req navigationType:navigationType ];
}

This should allow web components that rely on about:blank to work correctly.

 

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Eliot is a software developer by trade and a entrepreneur by spirit. He has built web software for the likes of YMCA, UPS, FedEx, Ford and Harcourt, and helped launch mobile apps like Coupon Policy, TourWrist, and Pocket Legal.


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