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Today in Top Angular News – Saturday, January 19

Today in Top Angular News – Saturday, January 19

Today’s topics include angularjs, bootstrap, webdev, javascript, angular7, ITNEXT, Typescript, Valuecontrolaccessor, React, and Angular2. Special thanks to contributors by Rehmaanali, rehmaanalis, @mathis.garberg, Mathis Garberg, 726514847387360, Vamsi Vempati, +Yatin, Yatin, Anil Singh, @michael.karen, Michael Karén, @vasouladalakiari, Vassiliki Dalakiari, @dleroari, Dler Ari, Jordan Irabor (@JordanIrabor), ITNEXT_io, and webcodegeeks.

Part 1 – MEAN Application Overview And Installation

At the first, we will see an overview of an application containing various options such as:

On the main page, it will display all the books at once from the database i.e MongoDB. we will be binding data through AngularJS using its directives and for the UI we will be using Bootstrap

In our application, we will create a form to insert book details with the suitable data into the database. In our application, we will create an another form to update the data which is already stored in the database as it makes easy to update data because we don’t have to re-enter the data. As we are building the MEAN application, therefore, we need the 2 software i.e MongoDB and NodeJs and the other 2 are the Script file i.e. AngularJS and ExpressJS

MongoDB is a documented oriented database, with high performance and easy scalability, it works well with programming languages and reduces the need for JOINS. Set Up MongoDB – See how to start the database connection

Download MongoDB – Windows

Download MongoDB – Linux

Download MongoDB – MAC

It is a platform built on Chrome’s javascript runtime. 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

Best practices for a clean and performant Angular application

map(value = value.item),
);4) Isolate API hacks
Not all APIs are bullet proof — sometimes we need to add some logic in the code to make up for bugs in the APIs. pipe(
map(value = value.item)
);6) Clean up subscriptions
When subscribing to observables, always make sure you unsubscribe from them appropriately by using operators like take, takeUntil, etc. subscribe(item = this.textToDisplay = item);After
Using takeUntil when you want to listen to the changes until another observable emits a value:
private destroyed$ = new Subject();public ngOnInit (): void {
. pipe(
map(value = value.item)
// We want to listen to iAmAnObservable until the component is destroyed,
takeUntil(this. subscribe(item = this.textToDisplay = item);
}public ngOnDestroy (): void {
a private subject like this is a pattern to manage unsubscribing many observables in the component. Continue reading

7 Simple Hacks to Supercharge Your Angular 7 App #angular #angular7

Angular is an excellent platform that allows developers to build applications with the web. 7 Simple Hacks to Supercharge Your Angular 7 App

Let’s quickly e into hacks that you can implement right away to develop mind-blowing applications in Angular 7. Boost Events speed

You can find Event handlers in different locations inside an Angular application like component event bindings and DOM. Reduce Change Detections

The default setting makes Angular application to go through hectic change direction with every single user interaction. The default setting is to load every single bit of code of all the pages in an application, even if the user never visits the page. Continue reading

AngularJS Development Environment Example

AngularJS is a JavaScript MVC or Model-View-Controller framework developed by Google that lets developers build well structured, easily testable, and maintainable front-end applications. The AngularJS library provides the in-build directives (or attributes) to extend the inside a web page. Here is a step-by-step guide to set-up a development environment for AngularJS. Now open up the Eclipse Ide and follow this link to start with your introductory AngularJS application. In this section, developers learned how to install an AngularJS plugin in Eclipse. Continue reading

Get Started with your first Angular Library – Michael Karén – Medium

  • The CLI generates everything needed to have a working library.

Creating the library
To start when using the CLI to build a library you first need to create a workspace. npm install -g @angular/cli
ng new librariesNow that this is done you can create your first library. cd libraries
ng generate library lib-shared –prefix mkNow you will have a projects folder with your first library called lib-shared. Let’s go on and create a new project and see what we need to do to use our library from it. Continue reading

Creating a custom form field control compatible with Reactive Forms and Angular Material

import { Component, Input, OnInit, OnChanges, ElementRef, ViewChild, Output, EventEmitter } from '@angular/core';
import Quill from 'quill';const SELECTOR = 'rich-editor';@Component({ selector: SELECTOR, template: ` class="text-editor-container" #container
id="editor" (click)="onTouched()" [ngStyle]="{'height':
/`, styles: [`img {
position: relative;
})export class FormRichEditorComponent implements OnInit, { read: ElementRef }) container: ElementRef;
@Input() value: any;@Output() changed: EventEmitterany = new EventEmitter();//this one is important, otherwise 'Quill' is undefined
quill : any = Quill; editor: any;constructor(public elementRef: ElementRef) {}ngOnInit(): void {
let editor = this.container.nativeElement. We have now our NG_VALUE_ACCESSOR provider defined, so let’s implement ControlValueAccessor interface:
export class FormRichEditorComponent implements OnInit, OnChanges, ControlValueAccessor {

ngOnInit(): void {

(eventName, …args) = {
} onChange = (delta: any) = {};

onTouched = () = {
this.touched = true;
}; writeValue(delta: any): void {
this. @Component({
selector: 'my-app',
template: `
Current Editor's value: {{ctrl.value}}/
rich-editor `
export class AppComponent {
ctrl = new FormControl();
}Now our custom form is connected with Angular Reactive Forms! If you try to wrap the form field we just created inside a mat-form-field tag, you will get an error that looks like that:
mat-form-field must contain a MatFormFieldControlThat’s because our component has not implemented MatFormFieldControl
The first step is to provide our new component as an implementation of the is an interface that the mat-form-field knows how to work with.We then add a provider to our component so that the form field will be able to inject it as a MatFormFieldControl (as we did before with [
useExisting: forwardRef(() = FormRichEditorComponent),
multi: true
provide: MatFormFieldControl,
useExisting: FormRichEditorComponent
]export class FormRichEditorComponent extends FormField implements OnInit, ControlValueAccessor, MatFormFieldControlany) {…This sets up our component so it can work with mat-form-field. In our component we'll use richeditor as our control type, which will result in the form field adding the class = 'richeditor';errorState
This property indicates whether the associated NgControl is in an error state. Continue reading

A comparison between Angular and React and their core languages

Angular and ReactOne thing that is really great about React in terms of performance is the Virtual DOM, which you’ve probably heard about a couple of times. So who uses which shop
Google Express

If you know of any large, well-known companies using Angular, please share with a link.TypeScript and JavaScript (ES6+)
As I mentioned, it can be misleading to only compare Angular and React without focusing on the core language each one has to offer. It is important to notice that TypeScript was released in the period of ES5, and during that time, ES5 was not a class-based OOP language. Alright, so if you are still confused what statically typed means, check this out:
Static typed property
Static typed property comparison between JavaScript and TypeScriptStatic typed argument
Static typed argument comparison between JavaScript and TypeScriptI’ve learned that lots of people believe that a statically typed language means reliable code, and is most often used as a winning argument over dynamically typed languages. Takeaway notes
React handles memory-management efficiently (virtual DOM)
React uses JavaScript (ES6), a recognized web-language since 1995
Angular uses TypeScript, released in 2012
Statically typed languages are great, but does note make code more reliable
Dynamically typed languages require less time to write and more flexibility to use your creativity (fewer typos)
Learning a statically-typed language may be a challenge, especially if you’ve only been working with dynamically typed languages
ES6 has implemented lots of great features such as modules, classes, spread operator, arrow functions, template literals that allows you to write less, cleaner and more structured code (syntactic sugar)
TS is simply ES6+ with typos and more

The framework/component-library you choose may influence how much time you spend programming and your budget. Continue reading

Browser Rendering Optimizations for Frontend Development

Whenever there’s a visual change in a web application, what happens under the hood is: the browser puts up a new frame for the user to see and interact with. Note: step 4 is shown in Chrome dev tools as Recalculate Styles

Before we go on to explore the browser’s rendering path and the optimizations that can be plugged into it, we need to learn about the app lifecycle as it would enable us to make smart choices in determining when an application should do the “heavy work,” hence creating smooth user experience and augmenting user satisfaction. The Browser's rendering path takes the following route:

On a web page, when a visual change is made (either by CSS or JavaScript), the browser recalculates the styles of the affected elements. Here’s an example of the method in use:

function doAnimation() {

performance tab in the Chrome dev tools allows developers to record a page while in use and displays an interface that shows how JavaScript performs in the web application. Style Calculation

Style changes are a key part of any web application’s rendering pipeline as the number of style changes required by its elements is directly proportional to the performance cost of style recalculation. Continue reading

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