Multipage vs Single Page and Unobtrusive Javascript

Question

I have a section of a site with multiple categories of Widget. There is a menu with each category name. For anybody with Javascript enabled, clicking a category reveals the content of the category within the page. They can click between categories at will, seeing the DOM updated as needed. The url is also updated using the standard hash/hashbang (if we are being Google-friendly). So for somebody who lands on example.com/widgets, they can navigate around to example.com/widgets#one, example.com/widgets#two, example.com/widgets#three etc.

However, to support user agents without Javascript enabled, following one of these category links must load a new page with the category displayed, so for someone without javascript enabled, they would navigate to example.com/widgets/one, example.com/widgets/two, example.com/widgets/three etc.

My question is: What should happen when somebody with Javascript enabled lands on one of these URLS? What should someone with Javascript enabled be presented with when landing on example.com/widgets/one for example? Should they be redirected to example.com/widgets#one?

Please note that I need a single page site experience for anybody with Javascript enabled, but I want a multi-page site for a user agent without JavaScript. Any answer that doesn't address this fact doesn't answer the question. I am not interested in the merits or problems of hashbangs or single-page-sites vs multi-page-sites.

Answer 1

This is how I would structure it:

Use HistoryJS to manage the URL. JS pushstate browsers got full correct URLs and JS non-pushstate browsers got hashed urls. Non-JS users went to the full URL as normal with a page reload.

When a user clicks a link:

If they have JS: All clicks to other pages are handled by a function that prevents the default action, grabs the HREF and passes the URL to an ajax request and updates the URL at the same time. The http response for that ajax request is then parsed and then loaded into the content area.

Non JS: Page refreshed as normal and loads the whole document.

When a page loads:

With JS: Attach an event handler to all your links to prevent the default so their href is dealt with via Ajax.

Without JS: Nothing. Allow anchors to work as normal.

I think you should definitely have all of your content accessible via a full, correct URL and being loading it in via ajax then updating the URL to reflect the address where you got your content from. That way, when JS isn't running, you don't have to change anything.

Is that what you mean?

Answer 2

Apparently your question already contains the answer. You say:

I need a single page site experience for anybody with Javascript enabled

and then ask:

What should someone with Javascript enabled be presented with when landing on example.com/widgets/one for example? Should they be redirected to example.com/widgets#one?

I'd say yes, they should be redirected. I don't see any other option, given your requirements (and the fact that information about JavaScript capabilities and the hash fragment of the URL are not available on the server side).

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If you can accept relaxing the requirements a bit, I see another option. Remember when the web was crowded with framesets, and we landed on a specific frame via AltaVista (Google wasn't around yet!) search? It was common to see a header saying that page was supposed to be displayed as a frame, and a link to take the user to the frameset version.

You could do something similar: when scripting is available, detect that you're at example.com/widgets/one and add a link to the single-page version. I know that's not ideal, but it's better than nothing, and maybe better than a nasty client-side redirect.

Answer 3

Why should you need to redirect them to a different page. The user arrived at the page looking for an answer. He gets the answer even if he has javascript enabled. It doesn't matter. The user's query has been fulfilled.

But what would happen if the user lands on example.com/widgets#one ? You would need to set up an automatic redirect to example.com/widgets/one in that case. That could be done by checking the if javascript is enabled in the onload event and redirect to the appropriate page.

Answer 4

One way for designing such pages is to design without javascript first.

You can use anchors in the page so:

example.com/widgets#one

Will be a link to the element with id 'one'

Once your page works without javascript, then you add the javascript layer. You can prevent links to be followed by using the event.preventDefault.

(https://developer.mozilla.org/fr/docs/DOM/event.preventDefault), then add the desired javascript functionality.