Resident control add-ins

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One of the most common questions I get asked about Control Add-ins is whether you can make a control add-in be always present and able to respond to your calls from AL. In other words: can you have a resident control add-in that you can invoke from anywhere in your AL code.

I’ve done a lot about control add-ins. However, I’ve never done resident control add-ins for real; all I know about them is pure theory and then some playing I did at various points of time. Still, this is an interesting topic that I wanted to address some way or other.

So, yesterday I did a live session about it.

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Why doesn’t my jQuery work?

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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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C/AL internals: Some more invalid object states

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If you have followed the posts about how C/AL really executes in NAV, you know that C# and C/AL can sometimes be in a state where C/AL compiles, but C# does not, causing you some headaches during run time.

However, what might not be obvious is that there are situations where C/AL does not compile anymore (typically due to a changed dependency signature, or due to an object that went AWOL) but C# not only compiles, but also happily runs as if nothing is wrong in the first place.

These situations can be confusing, and after having read my original post, my friend Heinz has pointed out to those situations and asked me if I can explain them. So, here it goes.

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Quick Tip: Extension Demo Data

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Extensions are a hot topic these days. There was a ton of sessions at both Directions events, likely also at NAVUG, and most of the talks you could hear while mingling around was extensions this, extensions that.

Chances are – you are going to be writing your extensions in a foreseeable future.

However, there is a catch with extensions – while it may be easy to load them up into an environment, unlike Cronus database your extensions must populate the database with their own demo or starter data. Otherwise, they will be pretty much useless.

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