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Today in Top Angular News – Monday, December 10

Today in Top Angular News – Monday, December 10

Today’s topics include angular, javascript, AngularJS, angular7, angular6, CSS, jestjs, and FrontEnd. Special thanks to contributors @stephenfluin, Stephen Fluin, The serverless webpack authors, @dleroari, Dler Ari, @palmer_todd, Todd Palmer, vicchow, @bilalhaidar, Bilal Haidar, 726514847387360, Vamsi Vempati, Chris Shatrov, anilsingh581, vegibit, and aaaronnte.


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


Creating a File Upload Component in Angular (Including Backend)

First, we will create a simple express server with just one route to accept file uploads. Afterward, we will create an angular application from scratch and build a beautiful file-upload component using the angular material ui-component-library. We are going to use the

Create a new application by opening a command prompt at the desired location and type:

Because we will need some complex ui-elements such as modal-windows, I decided to use the

To install this library, use this command:

To make the css of this module available in our app, we need to import it into our app's global style.css file:

Also, we are using a flexbox-design for this. To make flexbox a little bit easier to use with angular there is a library called the library like this:

To make our desired file-upload component as re-usable as possible, I decided to bundle it into a separate feature module. So let's create this DialogComponent:

The first thing we need to do is to add a file input element to our component. 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
onefootball
Google Express
NBA
Delta

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

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


A Complete Guide To Routing In Angular

It provides a complete routing library with the possibility to have multiple router outlets, different path matching strategies, easy access to route parameters and route guards to protect components from unauthorized access. This is an example route with an id parameter:

A route guard is a feature of the Angular Router that allows developers to run some logic when a route is requested, and based on that logic, it allows or denies the user access to the route. For example, the following guard will always allow access to a route:

You can then protect a route with the guard using the attribute:

The Angular Router provides the directive to create navigation links. We need to add which will contain our application routes and a router outlet where Angular will insert the currently matched component depending on the browser current URL. Open the file which contains the main app template and add the component:

This is where the Angular Router will render the component that corresponds to current browser’s path. Continue reading


Use the change detection cycle to manipulate dom when multiple routes load the same component
In your Angular application, you have the scenario of 2 Routes that load the same component ComponentA. Inside a change detection cycle, Angular checks the local variables inside ComponentA and notices that their values haven’t change yet (still no response from the server has arrived), therefore, it won’t call the ngOnChanges() function on ComponentB, hence the same old data will be rendered to the DOM. This means, we want to reset the local variables in ComponentA, instantly when the second route is clicked, so that Angular can detect a change in the input parameters of ComponentB and hence renders nothing on the DOM instead of the old data. @Component({
selector: 'c-a',
template: `c-b [schema]="schema" [data]="data"/c-b`,
styles: [“]
})
export class ComponentA implements OnInit, OnDestroy {By the time the change detection cycle starts, Angular detects a change in the input parameters of ComponentB and hence it removes the old data from DOM and shows blank instead. When the new data arrives, Angular triggers another change detection cycle updates the input parameters of ComponentB with the new data received and finally renders them to the DOM. Continue reading

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