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Today in Top Angular News – Tuesday, February 19

Today in Top Angular News – Tuesday, February 19

Today’s topics include angularjs, angular6, ACSDakar, abetterwaytolearn, ngrx, Angualr5, AngularCLI, ts, typescript, ITNEXT, Akita, javascript, and webdevelopment. Special thanks to contributors 1730841446975197, Ankit Sharma, @amcdnl, Austin, 1927821574142419, Trotyl Yu, +Yatin, Yatin, by Rehmaanali, rehmaanalis, tamas-piros, 10156107797189323, Amir Tugendhaft, @woz.brandon, Brandon Wozniewicz, webcodegeeks, @kapros, Panagiotis Kapros, BrieBugSoftware, and ngTurkiye.


How to use animation with Angular 6 – freeCodeCamp.org

Understanding Angular Animation States
Animation involves transition from one state of an element to another state. Angular provides the following three timing properties:
Duration
This property represents the time our animation takes to complete from start (initial state) to finish (final state). Each transition function has a stateChangeExpression defined to show the change of the state of an element and the corresponding array of animation steps to show how the transition will take place. Open the animationdemo.component.ts file and add the following import definition:
import { trigger, state, style, animate, transition } from '@angular/animations';Add the following animation property definition in the component metadata:
animations: [
trigger('changeDivSize', [
state('initial', style({
backgroundColor: 'green',
width: '100px',
height: '100px'
})),
state('final', style({
backgroundColor: 'red',
width: '200px',
height: '200px'
})),
transition('initial=final', animate('1500ms')),
transition('final=initial', animate('1000ms'))
]),
]Here we have defined a trigger changeDivSize and two state functions inside the trigger. Add the following trigger definition in the animation [
state('initial', style({
backgroundColor: 'green',
transform: 'scale(1)'
})),
state('final', style({
backgroundColor: 'red',
transform: 'scale(1.5)'
})),
transition('final=initial', animate('1000ms')),
transition('initial=final', animate('1500ms'))
]),Here, instead of defining the width and height property, we are using the transform property to change the size from all directions. Continue reading


Your NGRX Effects are Probably Wrong – Austin – Medium

  • Well the switchMap can cause race conditions.

Its subtle but can be a huge difference in production; instead of switchMap, I used concatMap. With a switchMap it will cancel and replace the prior observable with a new value that came through. Now there are cases where you want to use a switchMap, lets say you have a typeahead where as the user types, you want to fetch the new results and you really don’t care about the previous result. To help illustrate the difference, checkout this demo: difference is subtle but important because it can cause unexpected behavior that will take forever to track down. Continue reading


Introducing to NG-VDOM: A new way to write Angular application

In Angular, the component plays the part of the controller/viewmodel, and the template represents the view.A component and its template are connected by the public shape of Component, then they together could instantiate the View. A simple Angular component could look like this:
With its template to be:
Defining view through templates has a lot of advantages. A fully-featured TODO MVC example that uses the library can be found on GitHub with online preview available.From Template to ViewModel
To understand how Virtual DOMs can be handled in Angular, we should first understand what Virtual DOM is. For rendering Angular components, we need to make use of Angular Dynamic Components functionality, the most important parts ComponentFactory and provides the required metadata of Input/Output, making the properties mapping work:
In fact, commonly used packages like ngUpgrade and Angular Elements are both built on the top of the Dynamic Components functionality. Reverse Bridge
Use existing Class Components or Function Components in the Angular template without making a Virtual DOM object. Continue reading


ngFor in Angular 5 Instead of ngRepeat

As we have seen in AngularJS to repeat the loop, we have to use the angular’s directive named as . As the new Angular 5 feature comes with the same functionality but its directive is named as . For previous AngularJS version we have to simply just import or linked the library in the project, but now the Angular 5 (TypeScript) has its requirements such NodeJS and Git Version Control (optional), Can be used from windows command prompt. on running the this will open up a pre build component of Angular Documentation

After installation, let’s create a component for any view but the scope of this tutorial was to learn about ngFor

Check out what are components? In AngularJS to display the data from an array as a list, we would use the directive, In Angular 5 we have the directive. Continue reading


Managing Image Breakpoints With Angular

In this article, we’ll take a look at image breakpoints, their use-cases and throughout a hands-on example; we’ll implement them in an Angular application using Angular’s own BreakPoint Observer. In the era of responsive layouts (where we capture breakpoints based on the viewport size and based on the breakpoint we change the layout of the page), we also need to make sure that images can be displayed with the right dimensions — even after a layout change. We have a few options to generate responsive images:

Recommended reading: Automating Art Direction With The Responsive Image Breakpoints Generator by Eric Portis

I have uploaded the original image to my Cloudinary account which means that I can access that image via the following URL:

This is the full-sized, raw, original and unchanged image that we’ll work with. We can pick any number of breakpoints to observe from the list mentioned previously, and since we have an Observer we can subscribe to the changes and act on them:

To handle the options for the different images in Cloudinary, we’ll utilize an approach that will be very easy to follow. In this article, we reviewed an approach that utilizes a built-in Angular feature called BreakPoint Observer which gives us a powerful interface for dealing with responsive images. Continue reading

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