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TechTip: Dip Your RPG Toe into the JavaScript Framework Pool

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Valence provides a free and easy way to explore this exciting web and mobile technology.

 

Of all the interfaces used to interact with business data over the years, arguably nothing has evolved more rapidly than the technology behind what we see in today's desktop and mobile web browsers.

 

When you consider how commonplace highly intuitive features like fields that auto-complete as you type, editable data grids, drop-down menus, collapsible trees, etc.have become in the browser world, it's easy to forget there was once a time when the Internet was just a bunch of clunky, static HTML pages. The sluggish process of clicking on links and waiting for pages to draw themselves over and over again often served as a solid test of one's patience. It's no wonder then that businesses observing those early days of the "Web 1.0" evolution might have been reluctant to move their applications away from their tried-and-true client server or even 5250-based interfaces. The proposed browser-based replacements just weren't that impressive.

 

But how things have changed! When AJAX started becoming more mainstream around 2005made popular by web pages sporting PC-like features such as Google Maps and Microsoft Outlook for Webthe interactive nature of the Internet changed big-time. And it's been year upon year of steady improvement ever since. Borrowing from a popular ad campaign of the '70s and '80s to address the evolution of the web: You've come a long way, baby!

 

The secret sauce behind today's slick "Web 2.0"-style web pages is HTML coupled with JavaScript, and over the past decade a number of handy frameworks and libraries have evolved to make it easier for developers to create apps that leverage this technology. JavaScript frameworks and libraries not only supplement HTML code, but in some cases they can be leveraged to generate nearly all the HTML code of a web page, abstracting developers from many of the intricacies and idiosyncrasies of HTML-based development. This is a big deal, and it has significantly transformed the way many web and mobile pages are developed on nearly every platform. Ergo, it has moved us from creating simple web pages to building fully functional web-based apps.

 

And the good news is that there are no technological hurdles preventing this development paradigm from applying to IBM i as well. That is to say, RPG developers can be part of this party too!

 

But if you're like most RPG developers, you probably spend the majority of your time focused on back-end business logic and supporting ongoing day-to-day business needs. This can make the prospect of jumping in to front-end browser development a bit tricky to undertake. Where to start? 

 

That's why CNX released the free Community Developer version of Valence for IBM i back in 2009, with most of its source code included. This way RPG developers can install the software and quickly get their hands dirty working with practical, functioning examples in the exciting world of AJAX-based web and mobile development using Ext JS and Sencha Touch. 

 

Perhaps the best way to quickly see what a JavaScript framework (in this case, Ext JS) can do on IBM i is to take a common green-screen conceptthe ubiquitous subfileand extend it to the browser. In the web world, the rough equivalent to a subfile is called a grid, and there are several example grid apps included with the Valence Framework to illustrate how they work.

 

So as a quick exercise, let's walk through the steps of taking one of these example grid apps and making it display data from your own, say, customer master. This process should take just a few minutes to complete.

 

First, if you haven't already, download the free Community Developer edition of Valence. This gets you a self-extracting file that, when launched, will ask you for some basic configuration info and then automatically unpack itself onto your IBM i. Note that some email systems strip the ".exe" suffix from the downloaded installation file, so you may need to rename it before you launch it.

 

Once Valence is installed, log in by going to the URL link and using the default user and password (VVADMIN). This will get you logged into your IBM i via the Valence Portal. Click on the Navigation button in the upper left to navigate to the Examples folder. Open up Grids and launch the Page by SQL (method 2) app. This is the app we're going to doctor up to run over your own IBM i data.

 

120613SwansonFigure1

Figure 1: Launch the grid example app: Page by SQL (method 2).

 

When launched, the Page by SQL example app shows dummy data from a sample customer master file included with Valence called DEMOCMAST.

 

120613SwansonFigure2

Figure 2: This example grid app will be displaying your customer data.

 

Switching this app to show data from your own customer master file will entail two simple steps:

  1. We'll adjust the back-end RPG program to pull data from your own physical file. As you'll see, we're using a simple SQL statement to achieve this. If you're not yet using embedded SQL in your RPG programs, this will be a great way to see it in action on your system. There are other example apps showing how to load a grid using native I/O (i.e., READing through a file in a loop), but you'll quickly learn it's both simpler and far quicker to use embedded SQL, particularly when it comes to dynamic sorting of data.
  2. We'll adjust the front-end JavaScript code so it knows to look for the new field names coming from your RPG program.

 

So let's get started on step 1. Using your favorite source editor, open up the RPG source for member EXGRIDSQL2, located in file QRPGLESRC, library VALENCE32. Scroll down to the SendCustRecs procedure, where you'll find the following:

 

120613SwansonFigure3

Figure 3: RPG code for the server-side logic is provided.

 

Let's break down what the RPG program is doing and what we want to change here:

  • At line 34.00, we're setting the dynamic select and from clauses of the SQL statement in the stmt field. Change this to pull some select fields from your own customer master file.
  • At line 36.00, we're pulling in a field, converted to uppercase, called "search" from the browser. Then, at lines 38.00 through 41.00, we're appending search constraints to the statement. Note that we're uppercasing the character fields to ensure we're doing an apples-to-apples comparison to the uppercased "search" field. Change these fields to match the fields in your select statement.
  • Finally, lines 44.00 through 47.00 prepare the service program to process the SQL statement and send the results to the browser. The applySorters setting ensures a sort clause is added to the SQL statement to match the column the user wants to sort by; applyPaging tells the service program to load just a single page of data (akin to a page-at-a-time subfile); the rootName just gives the data set a name, which is used to link the results up to the grid in the browser.

 

Save your changes and compile the program (be sure VALENCE32 is in your library list). Then you're ready to adjust the corresponding front-end code.

 

For step 2, we'll edit the JavaScript source that controls the Ext JS grid of our example app. This source is located on your IBM i's IFS in path /valence-3.2/html/examples/grids/pagebysqlmethod2.html. You can edit this source using any editor or even something as simple as Notepad. Alternatively, since you're in the Valence Portal anyway, you may find it easiest to make these edits through the Portal's built-in source editor, which you can access by clicking on Navigation and launching the Nitro Source Editor app located in the Development folder. Once launched, scroll down to the IFS path in the tree panel on the left and double-click on the file to open it for editing.

 

120613SwansonFigure4

Figure 4: Here's the JavaScript code for the browser-side Ext JS logic.

 

As an RPG developer, this front-end code may look a bit foreign at first. But it's not necessary to understand every element right away, as you can take time to do that later. For now, we're only concerned with telling the front-end which fields to expect from your revised RPG program. The simple changes to be made are as follows (be careful not to lose any of the opening and closing brackets; in JavaScript, they're important!):

 

  • The code at line 26 defines the fields associated with the data model for the grid. Think of this as a front-end data structure for each customer. So update the list of fields here to match what you placed in the SQL "select" clause of your RPG program. Be sure they're all entered in uppercase, since that's the way the SQL engine will output them.
  • The "sorters" property at line 34 sets the default sort column (which users can change by clicking on any other column heading). For the sake of this example, change CUSNO to the field name associated with the first column you're showing.
  • Finally, the code starting at line 58 defines the columns on our grid. There are thousands of different ways to configure these columns, but for this exercise you'll just change the "header" properties to whatever column headings you want, and the "dataIndex" to match the field names you set in the data model.

 

With those changes made, click the "save" button and then close and relaunch the app. You should now see your own familiar customer data, loaded into an Ext JS grid and displaying one page at a time.

 

And with that, you've officially dipped your toe into the exciting world of JavaScript Framework-based development on IBM i!

Robert Swanson

Robert Swanson has worked as a developer on IBM i (and its predecessors of various names) since 1992, with an early emphasis on extending legacy ERP functionality beyond traditional office settings and into shop floor environments, where computer terminals tended to be less conventional.

 

With a background in industrial engineering, Rob spent many years championing the concept of weaning manufacturing and distribution operations from "off-line" reports and spreadsheets to real-time IBM i-based applications that enabled plant workers to interact electronically with office personnel. As the web world evolved and matured, the medium of choice has gradually switched from green-screen programs to browser-based applications.

 

Now a Senior Partner at CNX Corporation in Chicago, Rob works as an advocate for introducing Web 2.0-style desktop and mobile apps to IBM i shops, not only to increase user productivity but to bolster the image of IBM i as a world-class application server. CNX is behind the Valence Web Framework for IBM i, available for free download to the IBM i community as a tool for RPG programmers to interface their programs with Ext JS and Sencha Touch-based front ends. 

 

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    SB PowerTech WC GenericNow that many organizations have moved to a work from home model, security concerns have risen.

    During this session Carol Woodbury will discuss the issues that the world is currently seeing such as increased malware attacks and then provide practical actions you can take to both monitor and protect your IBM i during this challenging time.

     

  • How to Transfer IBM i Data to Microsoft Excel

    SB_HelpSystems_WC_Generic3 easy ways to get IBM i data into Excel every time
    There’s an easy, more reliable way to import your IBM i data to Excel? It’s called Sequel. During this webinar, our data access experts demonstrate how you can simplify the process of getting data from multiple sources—including Db2 for i—into Excel. Watch to learn how to:

    • Download your IBM i data to Excel in a single step
    • Deliver data to business users in Excel via email or a scheduled job
    • Access IBM i data directly using the Excel add-in in Sequel

    Make 2020 the year you finally see your data clearly, quickly, and securely. Start by giving business users the ability to access crucial business data from IBM i the way they want it—in Microsoft Excel.

     

     

  • HA Alternatives: MIMIX Is Not Your Only Option on IBM i

    SB_HelpSystems_WC_GenericIn this recorded webinar, our experts introduce you to the new HA transition technology available with our Robot HA software. You’ll learn how to:

    • Transition your rules from MIMIX (if you’re happy with them)
    • Simplify your day-to-day activities around high availability
    • Gain back time in your work week
    • Make your CEO happy about reducing IT costs

    Don’t stick with a legacy high availability solution that makes you uncomfortable when transitioning to something better can be simple, safe, and cost-effective.

     

     

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  • Backup and Recovery on IBM i: Your Strategy for the Unexpected

    SB HelpSystems SC 5413Robot automates the routine tasks of iSeries backup and recovery, saving you time and money and making the process safer and more reliable. Automate your backups with the Robot Backup and Recovery Solution. Key features include:
    - Simplified backup procedures
    - Easy data encryption
    - Save media management
    - Guided restoration
    - Seamless product integration
    Make sure your data survives when catastrophe hits. Try the Robot Backup and Recovery Solution FREE for 30 days.

  • Manage IBM i Messages by Exception with Robot

    SB HelpSystems SC 5413Managing messages on your IBM i can be more than a full-time job if you have to do it manually. How can you be sure you won’t miss important system events?
    Automate your message center with the Robot Message Management Solution. Key features include:
    - Automated message management
    - Tailored notifications and automatic escalation
    - System-wide control of your IBM i partitions
    - Two-way system notifications from your mobile device
    - Seamless product integration
    Try the Robot Message Management Solution FREE for 30 days.

  • Easiest Way to Save Money? Stop Printing IBM i Reports

    SB HelpSystems SC 5413Robot automates report bursting, distribution, bundling, and archiving, and offers secure, selective online report viewing.
    Manage your reports with the Robot Report Management Solution. Key features include:

    - Automated report distribution
    - View online without delay
    - Browser interface to make notes
    - Custom retention capabilities
    - Seamless product integration
    Rerun another report? Never again. Try the Robot Report Management Solution FREE for 30 days.

  • Hassle-Free IBM i Operations around the Clock

    SB HelpSystems SC 5413For over 30 years, Robot has been a leader in systems management for IBM i.
    Manage your job schedule with the Robot Job Scheduling Solution. Key features include:
    - Automated batch, interactive, and cross-platform scheduling
    - Event-driven dependency processing
    - Centralized monitoring and reporting
    - Audit log and ready-to-use reports
    - Seamless product integration
    Scale your software, not your staff. Try the Robot Job Scheduling Solution FREE for 30 days.

  • ACO MONITOR Manages your IBM i 24/7 and Notifies You When Your IBM i Needs Assistance!

    SB DDL Systems 5429More than a paging system - ACO MONITOR is a complete systems management solution for your Power Systems running IBM i. ACO MONITOR manages your Power System 24/7, uses advanced technology (like two-way messaging) to notify on-duty support personnel, and responds to complex problems before they reach critical status.

    ACO MONITOR is proven technology and is capable of processing thousands of mission-critical events daily. The software is pre-configured, easy to install, scalable, and greatly improves data center efficiency.