Question

I am using PhoneGap for an iOS project and everything is working except I want to detect a click of the logout link in our web app and intercept it with local logout logic. I am able to detect the logout link, but the logic below ALSO thinks it is the logout page when about:blank fires in PhoneGap’s UIWebView. Any ideas what I’m doing wrong?

- (BOOL)webView:(UIWebView *)theWebView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
    NSURL *url = [request URL];
    // If we detect the logout.jsp we need to go back to the login form and reset the credentials
    if ([[url path] rangeOfString:@"logout.jsp"].location == NSNotFound) {
        if ([[url scheme] isEqualToString:@"http"] || [[url scheme] isEqualToString:@"https"]) {
            return YES;
        }
        else {
            return [ super webView:theWebView shouldStartLoadWithRequest:request navigationType:navigationType ];
        }
    }
    else {
        // have PhoneGap go back to index page
        NSString *urlAddress = [[NSBundle mainBundle] pathForResource:@"www/index" ofType:@"html"];

        NSURL *url = [NSURL fileURLWithPath:urlAddress];
        NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
        [theWebView loadRequest:requestObj];
        return NO;
    }
}

EDIT:

I haven’t solved why this is happening, so for now I have added this workaround in the main else clause:

if ([[url path] rangeOfString:@"about:blank"].location != NSNotFound) {
    return YES;
}

The bounty will go to someone who can figure out why I even need that workaround when the initial IF is only checking for the logout.jsp string in the url and about:blank should never match that, but does in this case.

Answer 1

If the request url is “about:blank”, then [url path] returns nil.

So [nil rangeOfString:@"logout.jsp"].location return 0 and NSNotFound != 0.

That’s why the sentence ([[url path] rangeOfString:@"about:blank"].location != NSNotFound) is TRUE.