NotifyPropertyChange on Nativescript

If you like me are developing apps with nativescript core with typescript, probably know the PropertyChange event behind the MVVM (Yes, I love NativeScript core with TS because reminds me to my love for WPF/UWP development on Windows).

How on Windows, your class must implement the INotifyPropertyChange interface, in Nativescript specific case you just need to extends the Observable class.

Here how you can notify that a property is changed (we are assuming that we have a ViewModel with the property “Clicked” ad “ClickedTitle” in it.

public Clicked: number = 0;
public ClickedTitle: string = "";
// note that this is an attribute, not a property
public UpdateUI()
{
   this.Clicked = this.Clicked++;
   this.ClickedTitle = "You have clicked " + this.Clicked + " times";
   this.notifyPropertyChange("Clicked", this.Clicked);
   this.notifyPropertyChange("ClickedTitle", this.ClickedTitle);
}
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Typescript object VS javascript object

The use of Typescript is amazing for web/app development, however we must remember that Typescript is a javascript’s superset and it will be transpiled in pure js with all limitation of the case.

Let’s see a courios case I’ve faced today.

export class User
{
   // class attributes
   public name: string = "";
   public surname: string = "";
   // class properties
   public get FullName(): string
   {
     return this.name + " " + this.surname;
   }
   public SayHello()
   {
     console.log("Hello " + this.FullName);
   }
}

How you can see on the code block above, we have a class named User with two attributes, Name and Surname, and a readonly property, FullName.

function ConvertObject<T>(arg: any): T
{
    const result: T = {} as T;
    return Object.assign(result, arg) as T;
}
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Vue js with aspnet core

What is this?

Honestly, I’m a software engineer, a backend man… however, someone that can’t do frontends, grahpics, etc.

I’ve always been fashinating by the UI world but my skills and my patience in the new javascript-wtf-hell-packages-environment aren’t the best.

I love .net core, working with asp net core for websites and web api, but for UI until now I always used the classic approach: Razor pages + jquery.

One day I’ve met Vue.js. How you can imagine for a MVVM lover like me, with Vue has been love at first seen.

So I’ve tried to integrate it with aspnet core via Microsoft SPA Templates but Vue was no present in it. My first approach was to check the code on github JavscriptServices and create a VueDeveloperServer like for react, but after I’ve choose to use another approach to this scenario.

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