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Today in Top Angular News – Friday, January 4

Today in Top Angular News – Friday, January 4

Today’s topics include Angular, SoftwareDevelopment, monorepo, Fullstack, Javascript, React, Python, webdevelopment, programming, backend, frontend, developers, reactjs, angularjs, nodejs, expressjs, redux, vuejs, evolution, coding, Dzone, angularMaterial, and typescript. Special thanks to contributors Chad Michel, @maxim.koretskyi, Max Koretskyi, aka Wizard, @mathis.garberg, Mathis Garberg, +Aleksey Novik, Aleksey Novik, Sam Julien, Email, Facebook, Get link, Google+, Other Apps, Pinterest, Twitter, @martganzevles, Mart Ganzevles, @kmturley, Kim T, anastasionico, @nikhil.rangpariya, Nikhil Rangpariya, @bencabanes, Benjamin Cabanes, CODEmagazine, han huynh, Sven Loesekann, and @ahmedaabouzied, Ahmed Abouzied.


Creating a Progressive Web Application with Angular – Don’t Panic Labs

  • Now run the ASP.NET application and you have a working PWA with a .
  • The Angular application will make web calls on port 5001.

Progressive Web Applications (PWAs) are kind of the new hotness right now. PWAs are an attempt to create applications that live in the web browser and behave like real applications. A quick side note on ports: The ASP.NET Core application will run on port 5001. Continue reading


Exploring Angular DOM manipulation techniques using ViewContainerRef

You mark a DOM element with a template reference and then query it inside a class using ViewChild decorator. Here is the basic example:
@Component({
selector: 'sample',
template: `
#trefI am /
`
})
export class SampleComponent implements AfterViewInit {
@ViewChild("tref", {read: ElementRef}) tref: ElementRef;

ngAfterViewInit(): void {
// outputs `I am `
}
}The basic syntax to ViewChild decorator is the from template], {read: [reference type]});In this example you can see that I specified tref as a template reference name in html and receive ElementRef associated with this element. But since all components are hosted inside a custom DOM element and all directives are applied to DOM elements, component and directive classes can obtain an instance of ElementRef associated with their host element through DI mechanism:
@Component({
selector: 'sample',
…export class SampleComponent{
constructor(private hostElement: ElementRef) {
//outputs sample…/sample
}So while a component can get access to it’s host element through DI, the ViewChild decorator is used most often to get a reference to a DOM element in their view (template). Here is how it can be used:
@Component({
selector: 'sample',
template: `
ng-template #tpl
I am in template/
/ng-template
`
})
export class SampleComponent implements AfterViewInit {
@ViewChild("tpl") tpl: TemplateRefany;

ngAfterViewInit() {
let elementRef = this.tpl.elementRef;
// outputs `template bindings={}`
}
}The framework removes template element from the DOM and inserts a comment in its place. Here is the example of creating a ViewContainer at the specific place in a components template:
@Component({
selector: 'sample',
template: `
I am first /
ng-container #vc/ng-container
I am last /
`
})
export class SampleComponent implements AfterViewInit {
@ViewChild("vc", {read: ViewContainerRef}) vc: ViewContainerRef;

ngAfterViewInit(): void {
// outputs `template bindings={}`
}
}Just as other DOM abstractions, ViewContainer is bound to a particular DOM element accessed through element property. Continue reading


Clean Code Checklist in Angular ✔️ – ITNEXT

In an attempt to reduce complexity and help other developers out, I decided to put together a clean code checklist which covers my personal recommendations for writing clean production-ready Angular code. With only a few commands, your able to:
Create a project from scratch
Scaffold components, directives and services
Lint your code
Serve the application
Run unit- and end to end tests

You can find more information about the Angular CLI here. Folder Structure
As the application grows in size, it’s important to have a structure in place that allows for easy management and maintenance of your code base. Inaccurate comments are worse than no comments at all, as stated by anonymous:
Code never lies, comments do.This avoids writing code like this:
// check if meal is healthy or not
if (meal.calories 1000
meal.hasVegetables) {

}And hopefully more like this:
if (meal.isHealthy()) {

}Separation of Concerns
Angular is built around separation of concerns. Separation of concerns is the core of writing clean code in Angular, and uses the following rule-set:
Don’t create more than one component, service, directive per file. Continue reading


Angular 2 Application Architecture – Building Flux Apps with Redux and Immutable.js

The main idea of Flux is that the state of the application can be controlled by keeping it inside a data store. In Flux the only way to modify data is to dispatch an Action, that will trigger the creation of a new state. The action also contains all information needed to create the new state of the store, such as: the new Todo added, the new sort order, etc. For example this is the reducer for the application data state:

The reducer just branches the calculation of the new state and delegates it to other functions, or calculates the new state directly in the switch statement if that only takes a couple of lines. The store can now be injected in any component, and used to dispatch actions:

There are no real benefits point for storing state inside a store using Redux if we cannot make the state immutable in a practical way. Continue reading


Create Your First Custom Angular CLI Schematic with Nx

TL;DR In this tutorial, we’re going to learn the basics of Nrwl’s tool Nx, as well as how to create a custom workspace CLI schematic. In addition to including a schematic to implement monorepo-style development of applications and libraries, Nx includes a set of libraries, linters, and code generators to help large teams create and enforce best practices across their organizations. First, make sure you have the latest version of the Angular CLI installed globally:

Installing Nx globally is actually only required to create workspaces from scratch from the command line. With Nx, a workspace is a monorepo structure for the Angular CLI to keep your applications and libraries organized. Nx has a schematic named that can be used to add a new Angular module lib to our workspace:

We’ll get several prompts at the command line regarding tooling, testing, setup, and routing. Continue reading


The future for Angular 1.x, what next?

Rakish 2 has arrived, and with the new methodology the Angular group are taking with semantic forming (SemVer), Angular 3 will in a matter of seconds arrive. Where does this leave the greater part of web applications, years worth of programming speculation, designer abilities and future movement?As a matter of first importance, I need to begin by saying that Angular 2 is a totally new system. NativeScript will enable you to compose an Angular 2 application as you regularly would, yet to render Angular 2 on another stage you require the rendering layer for that stage – it arranges down to local code, zero web sees and colossal execution. x ought to be treated as a completely unique system to Angular 2 in the case despite everything you're building applications with it (and there is positively no damage in that, and don't feel influenced to move until the point when you see fit). Nor should we anticipate that groups should be compelled to revamp applications or feel strain to abruptly relocate.The Angular people group is a to a great degree astonishing network that I adore being to some degree part of – and I've had numerous engineers express concerns and stress over moving to Angular 2 or "goodness, you're still on 1. Continue reading


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


First start a new Angular app using the ng-cli:
ng new angular-jssAdd the JSS library:
cd angular-jss
npm install jss jss-preset-defaultIn your angular.json remove any default stylesheets from styles:
"styles": []In src/app/app. /app.component';import jss from 'jss';
import preset from declarations: [
AppComponent
],
imports: [
BrowserModule,
AppRoutingModule
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }Create your styles file e.g. In this example we are using different approaches in the same file to show off JSS functionality (variables, functions):
export const red: string = '#F44336'
export const green: string = '#4CAF50'
export const blue: string = '#2196F3'export const styles: Object = {
title: {
textAlign: 'center',
backgroundColor: '#E0E0E0',
':hover': {
backgroundColor: '#BDBDBD'
}
},
area: {
width: '100%',
height: '10rem',
color: 'white',
backgroundColor: data = data.area.backgroundColor
}
}You can now start using the JSS in src/app/app. Here we import the styles and variables we want to use, and can dynamically switch them afterwards using JavaScript:
import { Component, OnInit } from '@angular/core';
import jss from 'jss';import { styles, red, green, blue } from sheet {
readonly classes: Object
readonly update: Function
}@Component({
selector: 'app-root',
templateUrl: class AppComponent implements OnInit {
public classes: Objectpublic ngOnInit(): void {
const sheet: sheet = jss.createStyleSheet(styles, { link: true }). I find this clearer and it’s easy for error checking than using a string:
h1 [class]="classes.title"Angular JSS example/h1
input [class]="classes.area" type="textarea"When run in the browser the styles are compiled to css, with auto-generated classnames, and injected into the page! Continue reading


Composite variable in PHP (Arrays, Object and more)

There are two types of variables that belong to this group and are: Arrays and Objects,

in order to complete the variable section, you will now see two other types of variables that are Resources and Nulls. PHP basics for expert web developers (1' part)

Construct and Comments of PHP 7

How to use variables (PHP 7)

Composite variable in PHP (Arrays, Object and more)

Also this blog post is ided in 4 main sections

Arrays are ordered maps that associate values with keys,

There are three different types of arrays, they are indexed, associative, and multi-purpose. Until now you have seen that we have added scalar type variables as values within arrays,

PHP also gives you the possibility to add arrays inside arrays,

The result of it is called a matrix. Continuing to use the example previously used for arrays we can say that a car created by Ford and a car created by Mercedes are two different objects

but,

at the same time,

both can be instantiated by the automobile class,

both elements of the automobile class have a steering wheel and an engine,

but these attributes differ from one each other. The first is the function is_null() which returns a boolean value if the variable indicated as parameter is NULL,

the second function is unset() which takes a variable of any other type and makes it NULL. Continue reading


Evolution of JavaScript: Revolution of Web Development

Evolution of JavaScript: Revolution of Web Development
In 1993, NCSA — National Center for Supercomputing Applications, released NCSA Mosaic, the first-ever graphical Web browser, which played a significant role in expanding the growth of the nascent World Wide Web. Eich explained the need of two languages instead of just Java and the reason behind embedding JavaScript to HTML. Now let’s get into the evolution of JavaScript by introducing various frameworks which have pure dominance over Web market. So, whichever JavaScript framework you choose, make sure it is fulfils your project needs and save your time as well as money. If you are still not sure about which platform to work with, then there is one way to save your time and money, hire JavaScript developers from us to build a web application of your choice and get the best from JavaScript. Continue reading


Angular Change Detection Strategy: An introduction – Benjamin Cabanes – Medium

Change Detection means updating the view (DOM) when the data has changed.Change Detection is done in two steps
Angular’s change detection is done in two steps, the first one is done by having the developer updating the application model. If we modify this list, by changing the value of the first item of the todos’ list (in yellow), we will have the following flow:
The developer is making changes to the model (like a component’s bindings);
Angular’s change detection kicks in to propagate the changes;
Change detection goes through every components in the component tree (from top to bottom) to check if the model it depends on changed;
If Yes, it will update the component;
Angular updates the component’s view (DOM). The way Angular runs the change detection by starting from the top and continuing until it reaches the bottom, makes the system more predictable and more performant.Angular Change Detection Strategies
Angular provides you two Change Detection Strategies, the default one and the order to know whether the view should be updated, Angular needs to access the new value, compare it with the old one, and make the decision on whether the view should be updated. With onPush, the component only depends on its inputs and embraces the immutability, the change detection strategy will kicks in when:
The Input reference changes;
An event originated from the component or one of its children;
Run change detection explicitly the async pipe in the view. With onPush, Angular will only depend on the component’s inputs, events, markForCheck method, or the use of the async pipe in the template, to perform a change detection mechanism and update the view.This has for effect to gain a lot on performance, Angular doesn’t do any guess or useless work. Continue reading


Logging in Angular Applications

First, you create a simple log service class to log messages using console.log(). Instead of having to set the level property prior to calling your logger.log() method, add the new methods debug, info, warn, error, and fatal to the LogService class (Listing 2). The LogEntry class, shown in Listing 4, has properties for the date of the log entry, the message to log, the log level, an array of extra info to log, and a Boolean you set to specify to include the date with the log message. This method gathers the values from the properties of this class and returns them in one long string that can be used to output to the console window. After modifying the writeToLog() method, rerun the application and you should still see your log messages being displayed in the console window. Continue reading


Don’t Use Functions Inside Angular Templates and What to Use Instead – DZone Web Dev

  • Use a pure pipe instead of a functionin Angular templates.

Angular cannot detect whether the result of   is changed until it runs the   function. The thing to consider is that the   function will be run even though we have the same input data. If the calculation function is more complex and takes time to finish, it'll be a problem of wasting user-machine resource because we have to use resources for calculating the same result. Here is how pure pipe works from Angular document:

Let's create a custom pipe and move the   function to it:

And use it in the template:

Let's reload the page, select 5 items, and check the console. Continue reading


How to Modularize an Angular Application – DZone Web Dev

The reason for the size of the initial download is that the app module includes all the code of the dependencies that are needed by the whole application. The overview module has only one route because the login component is a modal panel. The route is defined in the following code block:

It is the same as in the overview module, execpt for the component. The application module now has only the splash component and the services and is defined in the app.module.ts file:

Lines 2-5 list the components of the application module. The better approach is to start the development of an application with modules, placing related components in modules with a common base route and subroutes to the components. Continue reading


Angular Material Responsive Navigation – Ahmed Abouzied – Medium

Using Angular-cli
Angular Material npm package comes with a number of schematics . These schematics make creating Angular Material application building blocks a bit easier. After you install the Angular Material package either by this npm command :
npm install –save @angular/material @angular/cdk @angular/animationsor by the Angular-cli command :
ng add @angular/materialYou can now use Angular Material schematics to create a navigation component with this command :
ng generate @angular/material:nav navigationwhich creates a new component called navigation with 4 files :
navigation component structureRead more on Angular Material schematics here
Now if we add the app-navigation element to our app.component.html file
and head to our browser we should see this :
Basic navigation out of the boxDisplaying the navigation component which looks like this :
Hiding the Sidenav
Now let’s make it more responsive by hiding the sidenav on big screens. hidden : {
display : none;
}Now if we had back to our browser we would find the sidenav is hidden on medium screens and only shows when clicking the Hamburger icon on small screen. isHandset$
This is a break point (less than 600px) provided by angular material layout . Continue reading

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