Where To Use AJAX

It's been well over a year now since GMail changed the way everyone thought about web applications.
Here are places Ajax should now be required in a web application:

Form driven interaction
Forms are slow. Very slow. Editing a tag on a del.icio.us bookmark? Click on the edit link to load the edit bookmark form page, then edit the field and hit submit to wait for the submission to go through, then return to the previous page and scroll down to find the bookmark to see if the tags look right..

But with Ajax? Click on the edit link to instantly start changing tags, click on the submit button to asynchronously send off changes to the tags and quickly see in place what changed, no reloading the entire page..

Deep hierarchical tree navigation
First of all, applications with deep hierarchical tree navigation are generally a nightmare. Simple flat topologies and search/tagging works very well in most circumstances. But if an application really calls for it, use Javascript to manage the topology UI, and Ajax to lessen the burden on the server by lazy loading deep hierarchy data. For example: it's way too time consuming to read discussion threads by clicking through and loading completely new pages to see a one line response..

Rapid user-to-user communication
In a message posting application that creates immediate discussions between people, what really sucks is forcing the user to refresh the page over and over to see a reply. Replies should be instant, users shouldn't have to obsessively refresh. Even GMail, which improves on the old hotmail/yahoo mail 'refresh inbox, refresh inbox' symptom, doesn't really push Ajax far enough yet in terms of notifying new mail instantly..

Voting, Yes/No boxes, Ratings submissions
It's really too bad there are no consistent UI cues for Ajax submission, because submitting a vote or a yes/no response is so much less painful when the submission is handled through Ajax. By reducing the time and impact of clicking on things, Ajax applications become a lot more interactive - if it takes a 40 seconds to register a vote, most people would probably pass unless they really care. If it takes 1 second to vote, a much larger percentage of people are likely to vote. (Sample:Movie ratings are 2008 on Netflix versus 210 ratings on IMDb.com)..

Filtering and involved data manipulation
Applying a filter, sorting by date, sorting by date and name, toggling on and off filters, etc. Any highly interactive data manipulation should really be done in Javascript instead of through a series of server requests. Finding and manipulating a lot of data is hard enough without waiting 30 seconds between each change in views, Ajax can really speed this up..

Commonly entered text hints/autocompletion
Entering the same text phrases or predictable text phrases is something software/javascript can be good at helping out with. It's very useful in del.icio.us and GMail, for quickly adding tags/email addresses..

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Where you shouldn't use AJAX:

Simple forms
Even though forms are the single biggest beneficiary of Ajaxification, a simple comment form, or submit order form, or other one-off rarely used form does not benefit from Ajax driven submission. Generally, if a form is not used much, or it's critical to work properly, Ajax is not that helpful..

Search
LiveSearch on blogs is more annoying than useful. There's a reason that Google Suggest is staying in beta and not going on the front page of Google. Searching on Start.com Live.com doesn't allow use of the back button to see a previous search, or previous pages. Maybe it's possible that no one has gotten this right yet, but getting this right is hard enough that it's generally not a good idea, or more trouble that it's worth..

Basic navigation
In general, driving basic site/application navigation using Ajax is an awful idea. Why would anyone want to spend time writing code to emulate the browser behavior when they could spend time making their application better? For basic navigating between documents, Javascript doesn't help..

Replacing a large amount of text
Ajax saves a complete refresh of the page, so small pieces of the page can be more dynamically updated. But if nearly everything on a page is changing, why not just request a new page from the server?

Display manipulation
Even though it seems that Ajax is purely a UI technology, it's not. It's actually a data synchronization, manipulation and transfer technology. For maintainable and clean web applications, it's a good idea not to have Ajax/Javascript manipulate the interface directly at all. Javascript can stay separate and simply manipulate the XHTML/HTML DOM, with CSS rules dictating how the UI displays that data..

Useless widgets
Sliders, drag and drops, bouncies, mouse gestures, whatever. Mostly these widgets can be replaced with more intuitive controls, or eliminated altogether in favor of simplicity. In picking colors, maybe a slider widget is useful to pick the exact shade. But in picking a price point in a store, a slider to pick the price to the cent is just overkill..

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