Html – Redirect mobile devices to alternate version of the site

htmlmobile-websiteredirectuser-agent

We've got an alternate version of out website ready for mobile devices. The content we serve is different and it works well.

What is the best way to detect which version to serve. We don't have a list of all mobile devices so to use the user-agent header is tricky as we may miss something.

We thought about useing device screen width – but what happens if the mobile device doesnt support javascript. How do we sniff this ?

Best Answer

You could use a device description database (such as WURFL) which will recognise the client device from the request headers. You can then query that database to decide if the device can handle your site (e.g. support javascript, or is the screen big enough) before deciding whether to redirect them to a different site.

You don't mention your environment, but WURFL supplies APIs for Java and PHP, and maybe others as well. If there's no supplied API, you can still use WURFL, but you'll have to parse and process the XML data yourself.

Related Solutions

Javascript – How to manage a redirect request after a jQuery Ajax call

I read this question and implemented the approach that has been stated regarding setting the response HTTP status code to 278 in order to avoid the browser transparently handling the redirects. Even though this worked, I was a little dissatisfied as it is a bit of a hack.

After more digging around, I ditched this approach and used JSON. In this case, all responses to AJAX requests have the status code 200 and the body of the response contains a JSON object that is constructed on the server. The JavaScript on the client can then use the JSON object to decide what it needs to do.

I had a similar problem to yours. I perform an AJAX request that has 2 possible responses: one that redirects the browser to a new page and one that replaces an existing HTML form on the current page with a new one. The jQuery code to do this looks something like:

$.ajax({
    type: "POST",
    url: reqUrl,
    data: reqBody,
    dataType: "json",
    success: function(data, textStatus) {
        if (data.redirect) {
            // data.redirect contains the string URL to redirect to
            window.location.href = data.redirect;
        } else {
            // data.form contains the HTML for the replacement form
            $("#myform").replaceWith(data.form);
        }
    }
});

The JSON object "data" is constructed on the server to have 2 members: data.redirect and data.form. I found this approach to be much better.

Javascript – How to redirect to another webpage

One does not simply redirect using jQuery

jQuery is not necessary, and window.location.replace(...) will best simulate an HTTP redirect.

window.location.replace(...) is better than using window.location.href, because replace() does not keep the originating page in the session history, meaning the user won't get stuck in a never-ending back-button fiasco.

If you want to simulate someone clicking on a link, use location.href

If you want to simulate an HTTP redirect, use location.replace

For example:

// similar behavior as an HTTP redirect
window.location.replace("http://stackoverflow.com");

// similar behavior as clicking on a link
window.location.href = "http://stackoverflow.com";

Best Answer

Related Solutions

Javascript – How to manage a redirect request after a jQuery Ajax call

Javascript – How to redirect to another webpage

One does not simply redirect using jQuery

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