Heavy weight Javascript client applications vs. lighter weight AJAX

I experimented with Mjt last year: Mjt is a client side template system: Javascript is used to merge data from JSON web service calls with templates to generate HTML - all in the browser (except for data fetched from a server). Mjt looks solid and has been fairy widely used; an alternative client side framework is Sun's experimental (not for production use!) Lively Kernel project. If you have not played with Lively Kernal, give it at least a one minute try - it uses the Morphic GUI framework, so if you have used Squeak, it will seem familiar.

The big problem, as I see it, of client side Javascript frameworks is issues of maintainability. I have worked with Javascript heavy web applications that other people originally wrote and they are definitely much more difficult to jump into, understand, and modify compared for example to AJAX heavy Rails applications or GWT web applications.

That said, there is something tidy about the idea of writing web applications in two intertwined but separate tasks:
  • Writing JSON web services and separately unit testing them
  • Interactively developing the client side with a framework like Mjt
I like to recognize technologies as early as possible that I might use in the future. Although I don't (yet) feel really comfortable working with frameworks like Mjt my gut feeling is that this is the future because it makes it easier to work with multiple languages and platforms for implementing web services and makes it easier to mix up data from multiple sources.

Comments

Post a Comment

Popular posts from this blog

Ruby Sinatra web apps with background work threads

In Java-land, I have often used the pattern of writing a servlet with an init() method that starts up one or more background work threads. Then while my web application is handling HTTP requests the background threads can be doing work like fetching RSS feeds for display in the web app, perform periodic maintenance like flushing old data from a database, etc. This is a simple pattern that is robust and easy to implement with a few extra lines of Java code and an extra servlet definition in a web.xml file. In Ruby-land this pattern is even simpler to implement: require 'rubygems' require 'sinatra' $sum = 0 Thread.new do # trivial example work thread while true do sleep 0.12 $sum += 1 end end get '/' do "Testing background work thread: sum is #{$sum}" end While the main thread is waiting for HTTP requests the background thread can do any other work. This works fine with Ruby 1.8.7 or any 1.9.*, but I would run this in JRuby for a lon
Read more

My Dad's work with Robert Oppenheimer and Edward Teller

Robert Oppenheimer and Edward Teller facilitated my Dad getting a professorship at UC Berkeley when I was 3 years old. Oppenheimer left Berkeley but Teller was a good friend of my father and I remember him being in our home. Three weeks ago, my wife and I were just leaving to see the new Oppenheimer movie when my Dad called. He mentioned that when I was in grade school he was invited to give a talk at Princeton. After his talk Oppenheimer talked with my Dad and invited him to have dinner at his house. My Dad said Oppenheimer was not well (I think he died of throat cancer soon afterwards) but his wife Kitty carried the conversation. My Dad, Ken Watson, passed away 10 days ago on August 18, 2023.
Read more

Time and Attention Fragmentation in Our Digital Lives

  As humans we have evolved over a few million years to be both attentive and reactive to danger, live in social communities, and spend much of our time being in the present moment gathering and eating food and socializing. The behavior of rapidly changing short attention to content on social media, too many good short form things to watch on streaming video entertainment platforms, are all rewiring our brains in an unnatural and unhealthy way. I fight back, but in really simple ways that entail little ceremony: Almost every morning I spend 30 minutes scanning Hacker News (about 10 minutes), Apple News (about 5 minutes), and the remaining time on Twitter and Mastodon finding interesting new (mostly tech) things. I make notes in a temporary Apple Note: links of things I may want to research, try, or simply read that day. I like to get this all done at once, and then not feel like I need to interrupt my activities during the day to “catch up” on what is happening in the world. In a way,
Read more