Tag Archives: JavaScript

Preventing trampling over $

In my previous post, I’ve written about the situation when you (or somebody you trust) redeclares the $ variable, thus inadvertently breaking all your jQuery code. I’ve also explained how to remedy for it inside the code you write by applying the Immediately Invoked Function Expression (IIFE) or Self-Executing Anonymous Function pattern.

However, is there anything you can do to prevent anyone from trampling over $ or jQuery variables in the first place?

As I said in my last post, yes, and no.

Let’s take a closer look at it.

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Why doesn’t my jQuery work?

First, a disclaimer. This post is written for (C/)AL developers who are struggling with JavaScript, who copy and paste JavaScript code from Stack Overflow right into VS Code and are happy when it works, and confused when it doesn’t. Still, if you are not a (C/)AL developer but want to learn a bit of JavaScript yourself, this post is not at al about AL, it’s purely about JavaScript, and about demystifying a piece of it that JavaScript developers take for granted, and that developers with experience only with simpler languages (such as AL) find confusing.

Now let’s jump into the point. A friend asked me for help with a control add-in in which “jQuery doesn’t work, I can do jQuery() but I cannot do $()”

This is one of the schoolbook examples of what happens when you don’t isolate scope in JavaScript, so let’s first see what happened, and then let’s see how you can fix it.

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Abusing Images property to load HTML in control add-ins

One of major limitations of control add-ins is not being able to define HTML. It seems so unbelievably unbelievable, that anyone looking at it from the outside of the NAV/BC playground may say “obviously, you must be missing something!”. But I am not. The one thing that you would expect to find first when defining a control add-in (and control add-ins in NAV/BC are nothing more than pieces of HTML that live within the allocated area of your browser real estate) is to be able to define the HTML. And yet, you can’t define it. The only way to show any UI from your control add-in is to procedurally create any of your control add-in HTML.

This makes no sense. No. Sense.

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A couple of AL controladdin demos – Google Maps and Tic Tac Toe

As a part of preparation for my last event of this year that concludes the conference season 2017 for me, I played around with the latest addition to the AL language stack for VS Code: control add-ins.

If you haven’t already tried it out, or heard about it, then you should get yourself a copy of NAV developer preview, and then visit the Control Add-In Object documentation for AL on MSDN to learn a little bit about how it works. The demo provided over there is, well, basic, to say the least, so I prepared two demos.

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Invoking Azure Functions from AL

One elegant way of replacing your .NET interoperability code with something else is by using Azure Functions. Sounds good in theory, but what does it take in practice? And what are Azure Functions, anyway?

Let me not take too much latitude, and let me just say that Azure Functions are a way of running simple pieces of code as a service that you can invoke like any other RESTful web services. And of course, they run in Azure. To learn more about them, follow this link: https://docs.microsoft.com/en-us/azure/azure-functions/functions-overview

Creating them is as simple, as invoking them, so let’s get started with an extremely simple demo that will illustrate how amazingly powerful they are, and why they are a perfect solution for replacing your .NET code with something better.

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