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What Language Do All the Most Popular Websites Use? JavaScript! Find Out Why

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Two decades of evolution make it a great time to supplement your RPG skills with JavaScript, the standard language of the browser. Let's take a trip down memory lane and take a practical look at one of the world's most popular programming languages.

 

JavaScript will hit a big milestone later this year as it turns the ripe old age of 20. Originally introduced as "LiveScript" by a company called Netscape in mid-1995, the JavaScript language has undergone quite a metamorphosisincluding a name changesince those early pioneering days of the Internet. JavaScript is in fact largely responsible for the amazing breadth of functionality many users take for granted in web pages and web-based apps today.

 

But it wasn't always that way! If you could ride the Hot Tub Time Machine back a dozen years and show a web page developer in that period what can be accomplished in a browser today, he'd never believe it. "There must be a PC program running that," he'd insist. And that's the beauty of modern JavaScript; it's an interpreted language that brings PC-like features to the realm of the browser without having to install anything.

 

Allow me to take a moment here to point out that JavaScript has nothing to do with Java. To use an analogy, Java is to JavaScript as ham is to hamster, or car is to carpet. JavaScript's name was simply the result of a marketing decision at Netscape. Sun's Java language had a huge buzz in programming circles at the time (anyone remember IBM's infamous learn-Java-or-be-flipping-burgers ad?), and Netscape saw an opportunity to ride on Java's popularity. Hence, JavaScript.

 

Upon its introduction, JavaScript was used primarily to augment the user experience on web pages with features such as:

  • Incorporating built-in edit checking on data entry fields
  • Providing for dynamic adjustments to attributes like font size or color
  • Triggering actions or popping up elements based on mouse activity
  • Moving elements around the page
  • And so forth

 

These interactive elements represented a huge leap forward in user experience from the prevailing status quo of a typical static web page. Early web developers and web surfers alike loved the functionality JavaScript brought to the browser and soon clamored for more features. Fortunately, the browser makers competing for market share at the time were eager to deliver.

 

The two dominant players in the browser space during JavaScript's early days were Microsoft's Internet Explorer and Netscape's Navigator. Though Netscape invented JavaScript, Microsoft quickly followed up with its own flavor of the language called JScript, to which it rapidly added its own unique features in order to lure more developers to its browser. With IE4 integrated into Windows, Microsoft eventually overtook Netscape and won the period now referred to as Browser Wars I. Browser Wars II ensued shortly thereafter with players such as Mozilla (Firefox) and Google (Chrome) getting into the mix, all pushing for additional enhancements to JavaScript in order to make their browsers more appealing.

 

All these years of fierce competition among the various browser makers has been a net win for developers working with JavaScript. New features were pushed into the language at a breakneck pace in conjunction with each browser update. But perhaps the biggest game-changer in the evolution and adoption of the language took place about 10 years ago with the introduction of asynchronous calls in JavaScript, often referred to as AJAX. This concept allows for separate portions of a web page to be updated independently while the rest of the page remains static, effectively transforming web pages into bona fide web apps. Precedent-setting applications such as Microsoft Outlook 360 and Google Maps leveraged AJAX to revolutionize what could be done within a browser. Even something as complex as an arcade game, complete with simultaneous independent animations, can be developed to run in a browser, a la JavaScript PacMan.

 

So assuming all the wizardry of JavaScript holds interest to you, where do you get started in learning it? I often work with RPG developers who have not yet dipped their toes very deeply into the web world, and I find the best way to get them comfortable with learning the basics of JavaScript is to demonstrate some practical tinkering in the browser (this, by the way, is what I'll be doing in my COMMON session, JavaScript 101: First Look for RPGers). In fact, we can use the very page you're reading right now as a quick and dirty introduction to using JavaScript. If you're viewing this in Chrome or Firefox, you can use your browser's integrated console and try out some basic JavaScript right away. Just open up the consolefor Windows users, a shortcut to that is F12; for Mac, Command-Option-Jand paste in the following code:

 

document.getElementsByTagName('p')

 

Figure 1: Here's the Google Chrome console.

 

Here, "document" is a reserved word reference to an object representing everything on the web page (aka, the "Document Object Model"), and "getElementsByTagName" is a JavaScript function we're invoking against that document object to find all the applicable elements. Upon pressing Enter, you should get back an array of all the individual "p" (paragraph) HTML elements on this page. Expanding the list and peering into some of the array's latter elements will reveal the HTML behind the text you're reading right now.

 

So now you know how to get a reference programmatically to the paragraph elements in this article. Let's say you had a hankering to read the body of this article in green, because after all these years of working on IBM i you've come to love green text. You could adjust the page's CSS properties to achieve this (and that would probably be the preferred method), but for sake of example let's instead use a few lines of JavaScript to adjust the text color by pasting the following code into your console:

 

makeGreen = function(x){

   p.style.color="green";

}

p = document.getElementsByTagName('p')

totalNodes = p.length;

for (i=0; i<totalNodes; i++) {

   makeGreen(p)

}

 

Pressing Enter should transform all the text of the article you're currently reading to a lovely shade of green. Let's break down what this code is doing:

 

  • First, makeGreen is being defined as a global function with one parameter, x. A function is somewhat analogous to a procedure in RPG, but in this case the procedure manipulates visual elements on the web page instead of doing, say, some business logic. Note that we don't explicitly define what the x parameter is. That's because JavaScript doesn't care; it'll figure it out when it's called, which is quite a departure from what we're used to in the compiled RPG world!
  • The body of the makeGreen function is enclosed in curly brackets after function(x) and consists of one line of code. Since we know we'll be passing in a page element, one of the properties available on a page element is its style, which has its own set of properties, including color (I'll show you how you might go figure that out in a moment). So here we're adjusting that property to a string value of "green", which is a valid HTML color name.
  • Next, we assign the results of the document.querySelectorAll('p') to a variable we're calling p, which will be an array since that's what document.querySelectorAll() returns. I should mention that within a JavaScript program you'd typically want to put a "var" in front of this line to formally declare the variables and functions, but since we're just doing this in the console, that's not necessary.
  • In the next line, we're creating another variable called totalNodes and assigning it the total count of the p array. Whenever you create an array variable in JavaScript (p in this case), it automatically gets a "length" property you can reference. You'll find you use this often.
  • Finally, with the makeGreen function defined, we create a for loop to iterate through the array of "p" elements on the page and call the makeGreen function for each one.

 

Now, if you had never done something like this before, how would you know about the properties of the p array that get us to p.style.color? Besides doing a quick Google search, another way you could figure it out is by experimenting within your browser console, something JavaScript developers do routinely (and something I'll demonstrate at COMMON in my Using the Chrome Console session). That's because the console's auto-complete features make it very easy to find what you're looking for, even when you're not certain of the exact name.

 

Let's illustrate that now. Back at your console, do this to assign the paragraph elements to array variable p again:

 

p = document.getElementsByTagName('p')

 

Now let's just take one of those elements and assign it to another variable we'll call zzz, like this:

 

zzz=p[0]

 

What you're doing here is taking the first element in the array of p's on the page and assigning it to a variable called zzz. This highlights two JavaScript behaviors that are unique when you're coming from the RPG world: (1) arrays are referenced with square brackets instead of regular parentheses, and (2) array elements in JavaScript start at 0 instead of 1.

 

So now you have a reference to the first p element on the page in a variable called zzz. On the next line in your console, type a single "z." You'll notice the console suggests the entire "zzz" variable for you, since it knows about its existence and is trying to help you out. Hit the right arrow to accept the suggestion and then add a period. You'll then see a list of properties and functions that can be changed or called to manipulate that paragraph element. It's a pretty long list of items (there's so much you can do with HTML, after all), but by scrolling through it, you can typically locate an aptly named function or property to get you what you're looking for. So click on the "style" property and type another period to see the next level of properties. This is where the "color" property resides.

 

Figure 2: The console's auto-suggest feature can help you find properties and methods.

 

This technique of tinkering in the console, in conjunction with some simple searches on Google, can be used to interactively figure out pretty much anything you want in JavaScript. It's also a great way for newcomers to the language, and web developers in general, to demystify what JavaScript is all about. I encourage you to try it out! As a good exercise, see if you can figure out how to change each paragraph's "visible" style property to "hidden" in the above code.

 

Only the Beginning

In a future article, I'll extend this JavaScript tinkering concept a few steps further and show you how to experiment with JavaScript frameworks. These frameworks, such as jQuery, Angular, Ext JS, Dojo, etc., are collections of pre-written JavaScript utilities that you can leverage using your own (comparatively simple) JavaScript. Frameworks have exploded in popularity in recent years because they make it possible to create very elaborate UI elements with very little code. To whet your appetite, here's an example of using the Ext JS framework to pop up a message box prompting the user for action:

 

Ext.Msg.prompt('Name', 'Please enter your name:', function(btn, text){

   if (btn == 'ok'){

       // process the entered text value...

   }

});

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 3: This message box was generated from a JavaScript framework (Ext JS).

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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    • Why disk encryption isn’t enough
    • What sets strong encryption apart from other solutions
    • Important considerations before implementing encryption

     

     

  • Security Bulletin: Malware Infection Discovered on IBM i Server!

    SB PowerTech WC GenericMalicious programs can bring entire businesses to their knees—and IBM i shops are not immune. It’s critical to grasp the true impact malware can have on IBM i and the network that connects to it. Attend this webinar to gain a thorough understanding of the relationships between:

    • Viruses, native objects, and the integrated file system (IFS)
    • Power Systems and Windows-based viruses and malware
    • PC-based anti-virus scanning versus native IBM i scanning

    There are a number of ways you can minimize your exposure to viruses. IBM i security expert Sandi Moore explains the facts, including how to ensure you're fully protected and compliant with regulations such as PCI.

     

     

  • Fight Cyber Threats with IBM i Encryption

    SB PowerTech WC GenericCyber attacks often target mission-critical servers, and those attack strategies are constantly changing. To stay on top of these threats, your cybersecurity strategies must evolve, too. In this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access

     

     

     

  • 10 Practical IBM i Security Tips for Surviving Covid-19 and Working From Home

    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.