Firefox Issue: SetTimeout Redirect Function Not Functioning Properly

Working on a page that redirects users to an installed application or a webpage as a fallback. This is implemented using ClientScript.RegisterStartupScript when the page loads, with a Javascript snippet like this:

<script type='text/javascript'>var a = window.location.search; setTimeout(function(){ window.location.pathname = '/Fallback.aspx'}, 500); window.location='myapp://open' + a;</script>

In Google Chrome, the redirection to the Fallback page works perfectly if 'myapp://open' fails. But in Internet Explorer, it only works with a timeout value of 100 or lower. The issue arises in Firefox, where the redirect never seems to work despite trying different timeout values. Any ideas why and how to resolve this specifically for Firefox?

Appreciate any insights you can offer.

UPDATE: Firefox displays an error page titled "The address wasn't understood" stating that the protocol (myapp) is not associated with any program.

UPDATE: To test this, replace '/Fallback.aspx' with 'www.google.com' in the code. In IE or Chrome, it will fail to open myapp://open and redirect to Google as intended. However, in Firefox, you may encounter the protocol unrecognized error and the fallback redirection won't happen. I hope this clarifies the situation and apologies for any confusion in my original question.

javascriptfirefoxhttp-redirectsettimeout

Answer №1

For those encountering the same issue, I have discovered several solutions to work around it. =) Firstly, you can use redirect code in the code behind to target the Firefox browser separately:

string userAgent = Request.ServerVariables["HTTP_USER_AGENT"];
                if (userAgent.Contains("Firefox") && !userAgent.Contains("Seamonkey"))
                {
                    ClientScript.RegisterStartupScript(this.GetType(), "checkForApp", "<script type='text/javascript'>var a = window.location.search; try { window.location.href='myapp://open' + a; } catch(e) { window.location.pathname = './Fallback';  }</script>");    //Firefox Only
                }
                else
                {
                    ClientScript.RegisterStartupScript(this.GetType(), "checkForApp", "<script type='text/javascript'>var a = window.location.search; setTimeout(function(){ window.location.pathname = './Fallback.aspx'; }, 100); window.location.href='myapp://open' + a;</script>");    // IE & Chrome
                }

While this method worked, I personally am not fond of relying on user agent examination. Another approach suggested to me was placing an iframe on the fallback page to trigger the app opening when directed to the fallback page (if the app is installed). This solution is effective in most browsers except Internet Explorer:

<iframe name="open_app" id="open_app" src="myapp://open" style="height: 1px; width: 1px; visibility:hidden;" ></iframe>

I ultimately opted for using an object tag on the fallback page which proved successful across major browsers including Chrome, Firefox, Safari, and Internet Explorer. With this method, the fallback page still loads in the user's browser, while also triggering the app if it is installed.

<object data="myapp://open<%= Request.Url.Query %>"/>

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