In today’s video, we are going to introduce you to what is perhaps the most elegant way to exchange data within Web applications. We will be talking about JSON, or JavaScript Object Notation. Eric Cassidy, an IBM i web developer at Profound Logic, will demonstrate the concept by creating RPG/CGI AJAX response programs that use JSON to provide multiple pieces of data to a Web application.

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In a few of my previous videos, I introduced you to several concepts on how to use AJAX for web development on the IBM i (System i, iSeries, AS/400). In this video, I discuss with Robert Ferguson, an IBM i web developer, what it takes to utilize the AJAX data that is returned from the server. Robert will provide an example by showing us how AJAX data can be displayed on a Web application’s screen with little effort.

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Today’s video is a response to a question from one of our viewers, Wil Rikken, from McNess BV in the Netherlands.

In my video on Sending AJAX Requests to the IBM i, I suggested the use of AJAX libraries, instead of coding everything from scratch. I also demonstrated a snippet of code that uses the ajax() function that we package with all our tools for the IBM i.

Wil wanted more details on this particular function. So, I have asked David Russo, the main developer and architect of our JavaScript AJAX library, to provide all the particulars on how to use the ajax() function with POST, asynchronous mode, etc.

I am also making the AJAX Library and the corresponding documentation available as a free download in our Resources Section on the site. You can access it here.

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Joining me in today’s video is one of our IBM i web developer/analysts, Hany Elemary. Together, we will continue to discuss AJAX by explaining how to generate a server response to an AJAX request from the browser. Hany will share his thoughts on how AJAX responses are similar to basic dynamic output pages that output data instead of HTML. We then go on to illustrate how AJAX response programs are built by providing examples in two popular IBM i (iSeries/AS400) web development technologies: RPG/CGI and PHP.

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To fully utilize AJAX on the System i (iSeries/AS400) system, you need to learn about 3 simple things:

1. How to make requests from the browser to the server
2. How to respond to these requests with RPG or another web-capable language
3. How to process that response within the browser

In this video, I talk about making requests, which can be tricky. Unless… you utilize an AJAX library. With an AJAX library in place, it’s really simple to make server requests either directly from HTML code or from a Rich Internet Application platform.

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If you are modernizing AS/400 RPG or Cobol applications, you should be learning and familiarizing yourself with the concept of AJAX. Why is AJAX such a big deal?

To answer this question, I introduce you to something about browser development that you may not have realized. This realization explains why AJAX is so relevant. I then provide an example of how AJAX is used to simplify form processing for both developers and end-users.

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As I talk to System i / RPG developers who are modernizing their systems, I get questions about what AJAX is all about and how it can be used when developing Web applications on the IBM i platform.

So, in this video, I introduce you to AJAX (or Asynchronous JavaScript and XML). As it turns out, the acronym is deceptive, and doesn’t really tell you much about how AJAX is used and what it really is.

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