Home/ Questions/Q 7857017
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-02T20:53:50+00:00

summary in short: edge.create stopped firing in embedded HTML inside UIWebView (and I did

  • 0

summary in short: edge.create stopped firing in embedded HTML inside UIWebView (and I did not change anything in code for a while) – any ideas how can I get it back?

I have iOS application which has UIWebView with Facebook Like button.
enter image description here

User logs into Facebook BEFORE this dialog appears, so there is no login logic happening.

I can click like/unlike – and it works fine – but it used to close the dialog, and few days ago this broke. Closing the dialog was achieve by subscribing to edge.create / edge.remove events.

Here is my HTML page:

<html>
    <head>
        <style type='text/css'>
            * { -webkit-touch-callout: none; -webkit-user-select: none; }
            body { margin:0px; }
            .fb_edge_comment_widget { display: none !important; }
        </style>
    </head>
    <body>                   
        <div id='fb-root'></div>
        <script src='http://connect.facebook.net/en_US/all.js#xfbml=1'></script>
        <script>
            function forwardEvent(name) {
                var iframe = document.createElement('iframe');
                iframe.setAttribute('src', 'event:' + name);
                document.documentElement.appendChild(iframe);
                iframe.parentNode.removeChild(iframe);  
            };
            function beginForwardingEvent(name) {
                FB.Event.subscribe(name, function(r) { forwardEvent(name); });
            };
            function beginForwardingEvents(names) {
                for (var i = 0; i < names.length; i++) {
                    beginForwardingEvent(names[i]);
                }
            };
            beginForwardingEvents(['edge.create', 'edge.remove', 'xfbml.render']);
        </script>    
        <fb:like    href='%@' 
                    send='false' 
                    layout='%@' 
                    width='%.0f' 
                    show_faces='%@' 
                    action='%@' 
                    colorscheme='%@' 
                    font='%@'
                    ></fb:like>
    </body>
</html>

and here is how i capture events in Objective-C code:

- (void)didObserveFacebookEvent:(NSString *)fbEvent {
    if ([fbEvent isEqualToString:@"edge.create"] && [_delegate respondsToSelector:@selector(facebookLikeViewDidLike:)])
        [_delegate facebookLikeViewDidLike:self];
    else if ([fbEvent isEqualToString:@"edge.remove"] && [_delegate respondsToSelector:@selector(facebookLikeViewDidUnlike:)])
        [_delegate facebookLikeViewDidUnlike:self];
    else if ([fbEvent isEqualToString:@"xfbml.render"] && [_delegate respondsToSelector:@selector(facebookLikeViewDidRender:)])
        [_delegate facebookLikeViewDidRender:self];
}


- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    // Allow loading Like button XFBML from file
    if ([request.URL.scheme isEqualToString:@"file"])
        return YES;

    // Allow loading about:blank, etc.
    if ([request.URL.scheme isEqualToString:@"about"])
        return YES;

    // Block loading of 'event:*', our scheme for forwarding Facebook JS SDK events to native code
    else if ([request.URL.scheme isEqualToString:@"event"]) {
        [self didObserveFacebookEvent:request.URL.resourceSpecifier];
        return NO;
    }
  ....
}

so once again – edge.create stopped firing (and I did not change anything in code for a while) – any ideas how can I get it back?

Thank you.

UPDATE:
though there is a FB bug reported, i still would like to understand why it does work on FBRELL site but does not work inside iOS UIWebView. May be there is a tweak required for iOS dialog? Is there a workaround for this? Started the bounty hoping to get an answer.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    It seems that the edge.create event won’t fire within the local HTML file. Whether this is by chance or design, I’m unsure, but I’ve done a few things and got this to work:

    1. Hosted the ‘FacebookLikeView.html’ file on my own server, substituting the format specifiers for the actual values i want, e.g. action='%@' is now explicitly action='like'.

    2. Removed everything from the load method in FacebookLikeView.m and replaced it with the line:

      [_webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.yourhost.com/FacebookLikeView.html"]]];

    3. Changed the line in the webView:shouldStartLoadWithRequest:navigationType method:

      if ([request.URL.scheme isEqualToString:@"file"])
    return YES;

      to

      if ([request.URL.host hasSuffix:@"yourhost.com"]) 
    return YES;

    It’s not the answer you were hoping for, but I hope this gives you some clues, and at the very least helps to get it working in the meantime.

    • 0