Archive for the ‘Usability’ Category

donjon first public demo – sort of

April 10th, 2008

Hmm, thinking about it, I guess the post title might be a bit misleading :-)

Today I showed donjon during the lunch to two IT-world friends. Seems that they really really liked it. My biggest concern was that the all usability points wouldn’t be well received, or that the interface wouldn’t communicate the intentions very well.

My test was showing them the app, making them look at a specific piece of the page and asking ‘what do you think this is for’. They were able to immediately tell what it was. And if you’re wondering, no, I wasn’t using some labels or text to identify the functionality.

Wow, I’m happy – and I’m not known for being happy about the things I create. Certainly tells me I’m in right path.

YUI Browser History Manager

April 7th, 2008

Pretty easy to get something working with YUI BHM (documentation). However I think Google’s manager – used by GWT is prettier. Yahoo’s support multiple modules, though.

The differences

If you have a GMail account you can see for yourself. Once you get into your inbox you’ll see the following on the URL:


Click on Drafts and you’ll notice it’s an ajax call. However the url changes to


Clicking on the back button will go back to /#inbox as expected. If you click Older you’ll notice the pagination parameter:


Searching will also add its parameters:


Clicking on a message from a search results adds the message id:


You can then click Back three times to go back to your inbox.

With Yahoo’s implementation you’d register a module (just a key), a initial state and a callback function. Your initial url would be unchanged:


Once the user perform some action that changes the state, and you want him to be able to back to the original state, you’d call the function register passing the module name and the new state (string). Imagine a call like register(“mymodule”, “newstate”) would result in the following url:


If you were to have more modules, it would generate:


As you can see it’s not as nice as in the end it’s just a querystring. In my case, search criterias are going to state, so it end up like:


Not as pretty as google’s, but works for now.

Ajax and browser history

April 7th, 2008

This is something that we – developers – don’t pay much attention. “Ajaxy” apps keep changing the content/state and once the user navigates somewhere else, she looses everything when going back to “that” page.

You might want to design in a way that the user never navigates off (awful), you might provide something that somewhat replaces the bookmarking ability of the browser, and you can keep inventing things to circumvent the very nature of web apps. It all comes down when you realize that the most used button on the web browser is the BACK button.

My attempt to deal with this was, like always, searching for a jquery plugin that handles history. I found two, but they are very limited. I was about to start to write my own when I bumped into YUI Browser History Manager. No idea on how well it will play with jQuery.. but seems very complete.