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Today in Top Angular News – Friday, February 1

Today in Top Angular News – Friday, February 1

Today’s topics include AngularJS, bootstrap, ITNEXT, Javascript, ReactiveProgramming, rxjs, frontend, ngrx, Fullstack, and DevTips. Special thanks to contributors @stephenfluin, Stephen Fluin, Cédric Exbrayat, Github, Ninja Squad, Twitter, cexbrayat, +Aleksey Novik, Aleksey Novik, 1927821574142419, Trotyl Yu, geekstrick, 10155262082979228, Liron Hazan, @bencabanes, Benjamin Cabanes, JavaScript_Plow, @nik.poltoratsky, Nikita Poltoratsky, @jinalshah999, jinal shah, @cyrilletuzi, Cyrille Tuzi, MrGeorgeWilde, positronXX, Jeremy Kithome (@thejere), and @HeymanDaniel, Daniel Heyman.


Version 7 of Angular — CLI Prompts, Virtual Scroll, Drag and Drop and more

Version 7 of Angular — CLI Prompts, Virtual Scroll, Drag and Drop and more
The 7.0.0 release of Angular is here! This is a major release ning the entire platform, including the core framework, Angular Material, and the CLI with synchronized major versions. Virtual Scrolling can improve the performance of applicationsHow to update to v7
Visit update.angular.io for detailed information and guidance on updating your application, but thanks to the work we did in v6, updating to v7 should be one command for most developers:
ng update @angular/cli @angular/coreEarly adopters of v7 have reported that this update is faster than ever, and many apps take less than 10 minutes to update. CLI Prompts
The CLI will now prompt users when running common commands like ng new or ng add @angular/material to help you discover built-in features like routing or SCSS support. StackBlitz 2.0 Supports multipane editing and the Angular Language ServiceAngular Console — A downloadable console for starting and running Angular projects on your local has a new home on npm, and has its first stable release for Angular
NativeScript — It’s now possible to have a single project that builds for both web and installed mobile with 2.0 has been released and now includes the Angular Language Service, and more features like tabbed editing

Documentation Updates
We’re always working hard to improve our guides and reference materials. Continue reading


What’s new in Angular CLI 7.3?

Choose the version you’re currently using (6.2.1 for example), and the target version (7.3.0 for example), and it gives you a diff of all files created by the CLI: It can be a great help along the official command. These polyfills allow to use modern JS features (that Angular needs) even in older browsers, and were commented in the dedicated file, where you could remove the comments if you wanted to include them. In previous version of the CLI, when using the schematic to generate a new router guard, you ended up with a (which is probably the most used one, but not the only one). While updating the TSLint configuration in the CLI, we also activated a few more rules. Note that the CLI now also officially supports the TSLint configuration file to be written in YAML (the default generated one is in JSON). 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


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


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


Dynamic Forms in Angular —The pattern beyond the buzz

The Reactive Forms API gives us some really useful tools to build the form, access its data model via accessing the form-group controls (directly via controls or using a getter of a certain control) etc and define its validators all via the code. The API provides the following:
import { FormBuilder, FormControl, FormGroup, Validators, FormArray } from '@angular/forms';Short review:
new FormGroup will create an instance of the form group. new FormControl will create an instance of the control — to be given to a form group. FormArray — enable to access control as a FormArray to dynamically create a set of controls, this is a bit more hard to catch so I added the below code snippet:

@Input() myfromGroup: FormGroup;

addItem() {
this.repeatControls = as FormArray;
{
return this.formBuilder.array(
);
}(In addition, there are the correlated directives such formControlName, formGroup, formArrayName)
On top of that API the term “Dynamic forms” was built,
“ It may be more economical to create the forms dynamically, based on metadata that describes the business object model.” An example to meta description:
nameDescription: {
name: {
type: 'text',
value: 'Type policy name',
label: 'name',
validation: {
required: true,
},
},
description: {
type: 'text',
value: 'Type description for policy',
label: 'description',
validation: {
required: false,
},
},
notes: {
type: 'text',
value: 'Write a comment to explain what changes',
label: 'notes',
validation: {
required: false,
},
}, cancel: {
type: 'button',
label: 'Cancel',
},
OK: {
type: 'button',
label: 'OK',
}
},In the following example, I’m using a descriptor model to dynamically create a from-group which has nested form {
const mainFormGroup = {};
for (const nestedGroup of Object.keys(description)) {
const nestedFormGroup = {};
for (const control of {
nestedFormGroup[control] = new }
mainFormGroup[nestedGroup] = new }
return new FormGroup(mainFormGroup);
}I hope I managed to explain it on a simple way, it’s really not complicated once you understand the reactive forms API, using it together with ngSwitch, ngFor we can do some really cool generic stuff. Continue reading


Now if we want to create the marble test of the previous example, we can do as follow:
it('should multiply by "2" each value emitted', () = { const values = { a: 1, b: 2, c: 3, x: 2, y: 4, z: 6}; const source = cold('-a-b-c-|', values); const expected = cold('-x-y-z-|', values); const result = source.pipe(map(x = x*2)); testing is really useful as this technique allows you to actually see the value emitted by your observable though time in a nice and simple manner. You can see more example on StackBlitz below:
How it works
Marble diagrams are parsed, creating an observable that emits test message objects. Few examples
To show the basics of Marble testing, lets see some examples with different RxJS operators. Map operatorSwitchMap operatorMergeMap operatorConcatMap operator
More examples on StackBlitz below:
Using time in Marbles testing
When you need to test asynchrone code, Marble testing can be an elegant way to test it. Marble testing has its own syntax
Marble testing is a visual way to test Observables
Easier to test, read and maintain
Easier way to test code affecting time Continue reading


Theming Angular at Ryanair

Last May Ryanair announced a partnership with Laudamotion enabling the Ryanair users to purchase Laudamotion tickets directly on Ryanair website. At the same time, we are having an ongoing migration from AngularJS to Angular for some of the website pages. We already implemented theming for the AngularJS website by simply overriding the styles but for Angular applications overriding styles is not that simple. Continue reading


Nebular meets Angular CDK – Angular Blog

Why we built Nebular with Angular CDK
As you know, it’s much easier to build user interfaces using component libraries. Here is an image just to illustrate:
Check full Popover documentation hereWe decided to create it as an Angular directive, that accepts the content as an @Input, something like this:
Figure out how to use Popover in the documentationThe result was quite successful, and from our experiments, we also discovered the potential to use it as the basis for other components, such as Context Menu, Tooltip and so on. Render Angular components dynamically on top of other components
Have you ever faced the situation when your dropdown is cut off by some parent element with overflow: hidden? Moving and Trapping browser focus between Angular components
Accessibility is a vital part of any modern web app. This functionality is not a part of Angular CDK, and that’s why we extended it and implemented the focus restoring functionality ourselves:
Learn how to use a focus trap by reading the codeAnd its usage becomes the following:
The full version of the Nebular DialogAs you can see, it has now become quite easy to trap the focus inside component and then release it when the component has been destroyed. Continue reading


· Starting from scratch calling web API (making get request)
· Displaying Full result with Headers, Code, Status, Status Text, etc
· Dealing with Error both (Server Side Errors and Client Side Errors)
· Some rxjs operators (like retry, catch errors, map etc)
· Search using debouncing
So, let’s e with HTTP Client from the Scratch. First in order to use HTTP Client in angular application we must need to import it in app.module.ts file as shown below,
Generate Service and provide it in root
So, as a first step in fetching data from our web API, we will create service. Then we are having one method name getAllTask which will simply make http call to my web API and also return us all the tasks. Injecting Service to app.component.ts
Note :
Always Use Subscribe because the httpClient method will not begin its http request call until you subscribe() with the method. In order to use these retry operator modify your service as shown below,
So now to check whether retry is working or not, I will turn off the wifi connection to check how many times it will make an http request, and after that it will give us error message. Continue reading


Understanding Angular modules (NgModule) and their scopes
NgModule is the first basic structure you meet when coding an app with Angular, but it’s also the most subtle and complex, because of different scopes. Because given the difference of scope between components and services :
if the module is imported for components, you’ll need to import it in each module needing them,
if the module is imported for services, you’ll need to import it only once, in the first app module. Modules to import each time you need them
CommonModule (all the basics of Angular templating: bindings, *ngIf, *ngFor…), except in the first app module, because it’s already part of the BrowserModule
FormsModule / ReactiveFormsModule
MatXModule and other UI modules
any other module giving you components, directives or pipes

Modules to import or NoopAnimationsModule
any other module providing you services only. Mixed NgModules
It can get messier: how to manage modules with components and services at the same time? Because the first time in app module, forRoot() will give the router components and provide the router services. Continue reading


Angular fundamentals – how to build modern web apps

This month co-host George Wilde will walk us through the fundamentals of the Angular framework. We'll cover everything you need to know to build your first Angular app. We'll see how an app is structured, how components talk to each other, what a service is, how routing works and how to collect data with forms. Whether you're new to Angular, or just want to check you're doing things the best way, this talk will fast-track you to building great Angular apps. There's lots of free parking on the streets around the venue "1000 trades" in heart of Birmingham's Jewellery Quarter and is only a few minutes walk from the train – 7pm Social / Networking

7pm – 7:50pm Angular fundamentals – how to build modern web apps

8pm – 8:45pm Open Discussion

Our interpretation of Lean Coffee (http://leancoffee.org/), a fast-paced open discussion. Continue reading


Angular 7 HttpClient & Http Services to Consume RESTful API – positronX

How to make GET, POST, PUT & DELETE request with Angular 6 | 7 using HttpClient API

In order to create this demo app you must have Node JS development environment set up in your machine. I will be creating an employee record management system with Angular 7, in this demo app i will consume RESTful API via HttpClient service. In this tutorial, I will give you the demo to access the external server to fetch the data using the RESTful API in Angular 6 | 7 with HttpClient service. In order to use HttpClient API to make the communication with Http remote server, you must set up this service in your Angular app. restApi id

I am going to send HTTP PUT Request in Angular 7 to update current employee data in our little demo app, It’s pretty simple just follow the following steps. Continue reading


Testing React and Redux Apps with Jest

/redux/actions'

export class Todo extends Component {
constructor() {
super();
this.state = {
formOpen: false,
todo: {}
}
}

handleOpen() {
this.setState({formOpen: true});
}

handleClose() {
this.setState({formOpen: false});
this.setState({todo: {}});
}

handleFieldChange(e) {

var field = e.target.name;

var value = e.target.value;
var todo = this.state.todo;
var todo = Object.assign({}, todo, {[field]: value});
this.setState({todo: todo});
}

handleEdit() {

this.state.todo);
this.handleClose();
}

handleDelete() {

}

handleToggle() {

{done: ! className="ui two buttons"
button className='ui basic green button' onClick={this.handleEdit}
i className='checkmark icon'/i Update
/button
button className='ui basic red button' onClick={this.handleClose}
i className='remove icon'/i Cancel
/button
/ :

className="ui toggle checkbox" style={{marginBottom: '10px'}}
input type="checkbox" name="public" value="on" defaultChecked ={this.props.done} onChange={this.handleToggle}/
labelComplete/label
/
className="ui two buttons"
button className='ui basic green button' button className="ui basic red button" /
/
}
/
/
/
)
}
}

Todo.propTypes = {
id: PropTypes.string.isRequired,
title: PropTypes.string.isRequired,
project: PropTypes.string.isRequired,
done: PropTypes.bool.isRequired,
url: PropTypes.string.isRequired,
createdAt: PropTypes.string.isRequired,
editTodo: PropTypes.func.isRequired,
toggleTodo: PropTypes.func.isRequired,
deleteTodo: default connect(null, {editTodo, toggleTodo, deleteTodo})(Todo);
You will need to add an actions file at the correct path to prevent a cannot find module error from occuring. export const editTodo = () = {
console.log('Sample async function')
}

export const toggleTodo = () = {
console.log('Sample async function')
}

export const deleteTodo = () = {
console.log('Sample async function')
}
You will notice that since we are using Redux, we are using a higher order component(connect()) to inject Redux state in the component. import React from 'react';
import { shallow } from 'enzyme';
import {Todo} from sinon from 'sinon';

let [editTodo, toggleTodo, deleteTodo] = new shallowSetup() {

const props = {
id: title: "Todo",
project: "Project",
done: false,
url: createdAt: "2017-03-02T23:04:38.003Z",
editTodo: editTodo,
toggleTodo: toggleTodo,
deleteTodo: deleteTodo
}

const enzymeWrapper = shallow(Todo {…props} /);

return {
props,
enzymeWrapper
};
}
What does this setup do? We can assert the unique rendered elements of the card as follows:

describe('Shallow rendered Todo Card', () = {
it('should render a card with the details of the Todo', () = {

const { enzymeWrapper, props } = shallowSetup();

image')). Continue reading


Why Blockchain Differs from Traditional Technology Life Cycles

Why Blockchain Differs from Traditional Technology Life Cycles
Why another bubble is likely and what the blockchain space should focus on now
In the aftermath of the 2001 internet bubble, Carlota Perez published her influential book Technological Revolutions and Financial Capital. Framework Overview
In Technological Revolutions and Financial Capital, Carlota Perez analyzes five “surges of development” that have occurred over the last 250 years, each through the diffusion of a new technology and associated way of doing business. Frenzies and Bubbles
In many ways, the bubbles created by the frenzy in the installation phase makes it possible for the new technology to succeed. The bubble creates a burst of (over-)investment in the infrastructure of the new technology (railways, canals, fiber optic cables, etc.). Liquidity Came Early
The 2018 ICO bubble happened early in blockchain technology’s life-cycle, during its gestation period, which is much earlier than Perez’s framework would predict. Continue reading

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