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Today in Top Angular News – Sunday, January 13

Today in Top Angular News – Sunday, January 13

Today’s topics include Angularjs, Tutorial, developers, docker, NgRx, RxJS, JavaScript, FunctionalProgramming, Typescript, Angular2, and AngularCLI. Special thanks to contributors @martganzevles, Mart Ganzevles, Rajeev Hathi, Ankit Sharma, Matthew Brown, Auth0, @saniyusuf, Sani Yusuf, @caroso1222, Carlos Roso, JavaScript_Plow, admin, @natelapinski, Nate Lapinski, Rahil Shaikh, @spp020, Saurabh Palatkar, and @thomasburleson_11450, Thomas Burleson.


Refresh DIV in 10 Seconds Using Angularjs

Angularjs provides wrapper of setInterval() with $interval angular service module. This service works in same way asbut it gives more control such ascallback by which we can cancel out the timer. If you want to restart the timer again you can do that simply by comparing the counter variable in $interval function and reassigning it again. First of all i have assigned $interval to timer variable and on the click event of the button we are killing it using cancel(). It works in same way like core JavaScript setInterval() works as well as provides additional methods to gain more control over timer. Continue reading


How we upgraded a website with half a billion annual users to Angular 7 in less than a day

If it takes a long time to upgrade Angular versions, it will also mean it will take long to introduce other changes to the codebase, whether it’s infrastructure, new features or bug fixes. So the ability to upgrade versions quickly has 3 major factors:
Our own team structure, setup and ways of working
The Angular library itself and the way the Angular team develops it
Stick to the standards — don’t try and reinvent the wheel

We think that in the last few years these factors improved a lot and keep on improving, so we wanted to share the path we went through till now and our future plans in order to help others improve their development flows. Those type of architectures and structures, which usually rely on manual tools to do the separation (separate git repositories for example) makes it extremely difficult to introduce a change that does affect everyone, for example an Angular version that affects the whole app and all the teams building it. When we moved the separate teams code into a single codebase and moved into the direction of treating all whole codebase as one single Angular app, the setup became even more simple, while giving us more time to optimize builds and get the performance benefits from new versions of the CLI instead of investing in custom code and lagging behind. https://update.angular.io
NG CLI Update
Once we moved to the standard Angular CLI, the Angular team introduced the ng-update command, which really helps and automates a lot of the changes needed when upgrading an Angular version. Continue reading


Using OS Environment Variables in Angular (with Docker) – The InfoGrid

As you might have guessed from the title of this post, we will be using docker and OS Environment variables to pass some keys to Angular CLI, through webpack. And then, we are reading the OS environment variables and passing them to Angular, via webpack. We are grouping all our environment variables, under $ENV variable, so that we can simply access them like this: $ENV.ENVIRONMENT or $ENV.SomeAPIKey inside our angular app. Then, inside the our environment.prod.ts, we need to read the OS environment variables passed to our application, into variables we can use, within our angular application. They can be used just like any other angular environment variables inside your application. Continue reading


AngularJs 2 Series: Custom Event Binding

  • We will bind the event to the selector of the component class.

We will create a component with a custom event that will emit or send some data and another component will listen to that event and receive that data. The class will have a custom property event named which will be an instance of type . Next we define a method named which will use the event property to emit some text. Let’s create another component called and here we will listen to the above defined event for any text message and display the same. Continue reading


Understanding Angular 6 Animations – DZone Web Dev

Animation is a transition from one state of the element to another state. Angular provides us the following three timing properties:

This property represents the time our animation takes to complete from start (initial state) to finish (final state). We can define the duration of the animation in the following three ways:

This property represent the time duration between the animation trigger and the beginning of the actual transition. The state and transitions for our animation need to be defined in the trigger implementation. Each transition function has a defined to show the change of state of an element and the corresponding array of animation steps to show how the transition will take place. Continue reading


A Test-Driven Development Introduction to Angular 2 – Part 2

My approach to get this working was to start from the new Angular 2 quick-start project, port in the original application source code, and refactor as needed to make things work. We set up our injector providers in Angular’s which is used to declare the component we want to build for the test and dependency injection providers. The main functions we want to test on this component are retrieving employee data on initialization, delete functionality, and allowing our users to navigate to the edit and add employee views. Also, in the constructor, Angular’s dependency injection will provide our component with the mock object that we build previously and the spy object so we can navigate our users to other views. We’ve built an employee directory using Angular 2 with unit tests, gone over some differences between Angular 2 and version 1, and introduced some of the features of TypeScript. Continue reading


Where to Store Tokens

Treat tokens like credit card numbers or passwords: don’t store them in local storage. If your application has a backend server at all, then tokens should be handled server-side using the Regular Web App Login Flow, Native/Mobile Login Flow, or Hybrid Flow. If you have a single-page application (SPA) with no corresponding backend server, your SPA should request new tokens on page load and store them in memory without any persistence. There are different options to control the lifetime of a cookie:

This video will show you how to handle session data when building a web app. It will help you understand how your application uses cookies and sessions to manage the state of an authenticated user. Continue reading


PART 1 — The Case For Component Inheritance In Angular
Angular is a very Enterprise friendly JS framework. The component only inherits the class logic
All meta-data in the @Component decorator is not inherited
Component @Input properties and @Output properties are inherited
Component lifecycle is not inherited

These features are very important to have in mind so let us examine each one independently. Component @Input and @Output properties are inherited
Component Input InheritanceThis is another feature that I really love about component Inheritance in Angular. Component B In UseYou can see that ComponentB is using the name property it inherited from ComponentA
Component lifecycle is not inherited
This part is the one that is not soo obvious especially to people who have not extensively worked with OOP principles. You can see that the Base component which in this case is ComponentA implements Angular’s OnInit lifecycle interface. Continue reading


Angular ng-app directive Example • InfinityKnow

  • Body element become(ng-app) the root element for the AngularJS apps.

In this post we will show you Angular ng-app directive Example, hear for Angular ng-app directive Example we will give you demo and example for implement. In this post, we will learn about Angular ng-app directive Example with an example. The ng-app directive says to AngularJS that the

or any html element is the “owner” of an AngularJS app’s. …Something … &title&Example of The ng-app directive&/title& &a &h1&Example of The ng-app directive&/h1& && {{8/8}} &/& & id="simplemy"& {{9/2}} && {{25/3}} &/& &/& && {{4/6}} &/& &title&Example of ng-app with App Module&/title& &a &h1&Example of The ng-app directive&/h1& && {{8/8}} &/& & id="simplemy"& {{9/2}} && {{25/3}} &/& &/& && {{4/6}} &/& var app = angular.module('myFirstApp', []); &title&AngularJS Multiple ng-app within a page&/title& &a &h1&Example of The ng-app directive&/h1& & id="App1"& &h1&Your order&/h1& && &&{{item.price | currency}}&/& &button&Remove&/button& &/& &/& & id="Appmodule2"& &h1&List of username&/h1& && &p&{{_name.username}}&/p& &/& &/& var purchaseCartModule = angular.module("purchaseCart", []) function($scope) { $scope.items = [{ product_name: "www.infinityknow.com", price: 950000 }, { product_name: "www.infinityknow.com", price: 890005 }, { product_name: "www.w3free.blogspot.com", price: 598695 }]; $scope.remove = function(index) { $scope.items.splice(index, 1); } } ); var usernameModule = angular.module("usernameList", []) function($scope) { $scope.username = [{ username: "Dhaval" }, { username: "Krunal" }]; } ); ['usernameList']); Continue reading


Reading the RxJS 6 Sources: Map and Pipe – Angular In Depth

I know these two things before going in:
map is an operator that transforms data by applying a function
pipe composes operators (like map, filter, etc)

Map
Map’s job is to transform things
map is a pretty simple operator. In this example, the observable returned by of('World’) is the source observable, and the single value 'World' is going to be pipe'd through to map’s projection function, which looks like this:
x = `Hello ${x}! Unlike map, which is an operator, pipe is a method on Observable which is used for composing operators. pipe(
map(x = x + 1),
filter(x = x 2)
);Same output, same concept (composing operators), different syntax. In RxJS, the idea is that you create a pipeline of operators (such as map and filter) that you want to apply to each value emitted by a source observable, of(1,2,3) in this example. Continue reading

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