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Today in Top Angular News – Thursday, October 4

Today in Top Angular News – Thursday, October 4

Today’s topics include AngularJS, AutoTweet, accesibility, JavaScript, Programming, Typescript, and Tech. Special thanks to contributors hasdid, @NetanelBasal, Netanel Basal, Manfred Steyer, by Rehmaanali, rehmaanalis, NG_Tutorial, Jeremy Likness, 726514847387360, Vamsi Vempati, Praveen0849, @simbasagwete, Simba Sagwete, Paul Krill, @rob.w.pinna, Robert Pinna, and webcodegeeks.


Building A PWA Using Angular 6

Throughout this tutorial, we’ll be using Angular 6 to build a Progressive Web Application, step by step, implementing the core tenets of PWAs using Angular CLI v6. Next, we’ll use the “Audits” panel (Lighthouse) from Chrome DevTools to analyze our web application against the core tenets of PWAs. Our application has 7 failed audits mainly related to Service Workers, Progressive Enhancement, HTTPS and Web App Manifest which are the core aspects of a PWA. One simple example of PE is the use of the HTML tag that informs users of the need to enable JavaScript to run the application in case It’s not enabled:

The fourth failed audit (“Does not redirect HTTP traffic to HTTPS”) is related to HTTPS which is also a core aspect of PWAs (service workers can be only served from secure origins, except for localhost). The three failed audits (“User will not be prompted to Install the Web App”, “Is not configured for a custom Splash Screen” and “Address bar does not match brand colors”) are related to a missing Web App Manifest which is a file in JSON format that provides the name, description, icons and other information required by a PWA. Continue reading


Accessibility Made Easy with Angular CDK – Netanel Basal

We’ll create a searchable list and add the option to choose items using the keyboard. The ListKeyManager Class
ListKeyManager manages the active options in an item list based on keyboard interactions. Under the hood, active option will be managed based on the user’s keyboard navigation. Each managed item should implement the Highlightable interface:
As the user navigates, Angular calls the setActiveStyles() method on the newly active option and setInActiveStyles() on the previously option. Each managed item must implement the FocusableOption interface:
As the user navigates, Angular calls the focus() method on the newly active option. Continue reading


Angular Material – Part One

All the bootstrap components have a different look and feel whereas Angular Material is based on the Material design which is a visual language developed by Google in 2014. And now we need to install a couple of node packages

@angular/cdk stands for Component Development Kit which is one of the dependencies of Angular Material and it is basically a library that allows you to build awesome components for the web but without adopting the material design visual language. So in Angular Material, we have a custom component for rendering the elements and this md-checkbox is the selector of checkbox component of Angular Material. So this checkbox component in Angular Material implements a very similar API to the native checkbox we have in Html5. For example, in html5 in order to add checkbox we need to use input element with checkbox type and if we want to add a bunch of attributes

So our custom checkbox in Angular Material also has these properties. Continue reading


Connect Angular Forms to Akita Store – Netanel Basal

Connect Angular Forms to Akita Store

The PersistNgFormPlugin helps to keep your form synced with your store. In addition to the products entities, the store root holds a state which contains the current active filters. We’re using the built-in Akita query methods to reactively get the products from our store and the loading status. From this point, Akita will take care of updating the form value on component initialization and the store upon form’s value changes. In summary: The Akita PersistNgFormPlugin can provide you with a quick and easy way to sync between any form and a store, which comes with built-in functionality that’s often needed when carrying out this technique. Continue reading


Angular 6 has arrived – Here are its new features in overview.

New Features in the Framework and CLI

Angular Elements allows the provision of web components and the still experimental view engine ngIvy promises unrivalled small bundles. Once the responsible npm package @angular/elements has been installed, any angular component can be converted into a custom element using the createCustomElement method (listing 1). Another field of application for Angular Elements is the orchestration of micro apps. For example: If you only want to provide simple custom elements with Angular, Angular can be blown away almost completely. In other cases where an indirection is required between a requested token and the service, which is supposed to be actually injected, further properties should be added:

The property provideIn does specify the module for whose scope the service is to be set up. Continue reading


Part 4 : MEAN APP – Build FrontEnd With AngularJS

  • We will setup view and build a form to interact with our APIs.

The next thing will be doing is making the controller file to make interaction with the Forms. After creating the controller, the next thing will be doing is binding our Bookstore API into forms using AngularJS. After completing the design all you need to run is Node app And the MongoDB server. so just one command in terminal

After that start the MongoDB Server from the command pad. Continue reading


10 Useful Angular Features You Might Not Have Heard Of

For example, lets say we want to display only the first 10 items of an array, we could do this using the like so:

This is a very simple pipe is designed for formatting numbers. This is normally achieved by setting the value of the tag in the document head, however we can't use standard Angular bindings eg: because is not inside an Angular component, so we must instead use the service. For example, to have two structural directive we can simply do this:

And to insert a template as a child:

These are just a few of the many, many uses this element has, I'm sure you will find more! To call the function add the following to the bootstrap code:

To start the profiling run the following in the DevTools console:

There are cases in many applications where you need to describe a number of items, and with language being the complicated thing it is, we often have to deal with different phrasing based on different quantities. If we want the whole component to retain its whitespace then we can simply use the option in the component decorator:

We may however want to only retain whitespace within a specific DOM element in which case we can use the directive eg:

Additionally we may want to use in our document, but Angular interprets this a use of interpolation and will try to evaluate whatever is within it. Continue reading


Real-time Communication in AngularJS with ($Q)orlate

This led to me brainstorming what I’ve seen in these types of systems with Angular and I came up with three very distinct scenarios that I felt could be addressed with a lightweight Angular service. The consumers simply call the service with a standard promise, and it will either be satisfied once the data is loaded or rejected when it times out (in the example, the initial call times out but the subsequent call works because the data has been loaded). ($Q)orlate guarantees the promise, so even if a request is rejected from a timeout and the original call returns, later requests will be resolved immediately with the result. The service simply needs to establish the promise with a correlation:

When the message comes in, the correlation is notified:

You can also reject the correlation, and the configurable timeout will also reject it automatically if the return message is not received within the timeout period. I do realize always is used in a different context relative to promises, but it made sense here because that’s what is happening – the message is always notifying the subscriber. Continue reading


Best practices for a clean and performant Angular application

pipe(
map(value = value.item),
take(1)
);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 {
iAmAnObservable
. 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


What is AngularJS? What are the benefits of using AngularJS? – Quora

  • In Angular JS, we creating dynamic web applications.
  • It is very useful in creating dynamic web applications.

Angular JS is an open-source framework for building web application front-end and based on JavaScript and maintained by Google developers to solve the problems during the development of Single Page Application. Developers working with Angular JS use HTML as a template language and its syntax is used to express the application’s component briefly. Through, Angular JS, we build GUI (Graphical User Interface) for dynamic websites and web programs and Single page applications are created smoothly using Angular JS framework which allows writing custom HTML codes and integrating with other UI tools. Continue reading


What to consider when upgrading from AngularJS to Angular 2.0+

What to consider when upgrading from AngularJS to Angular 2.0+
For the last year we have been working with a large corporate client with 20+ web applications written in AngularJS (version 1.5 to be exact). Following Google’s announcement earlier this year, it became clear that the client would need to upgrade all of those applications to a more modern front-end framework. Our Approach
The ngUpgrade module allows one to bootstrap AngularJS into Angular 2.0+ so components can be built in both frameworks and run in the same application while sharing data and services. It wasn’t all roses however… Angular mandated TypeScript which could have been potentially jarring for front-end developers who hadn’t known anything other than Javascript. There were also no guarantees a similar situation wouldn’t arise in the future even though Google must have recognised the pain they caused for many developers having once been a leading framework and now, trailing React as a huge portion of the community has jumped ship. Continue reading


What’s new in AngularJS Version 6 and Version 7

  • And the first beta of Angular 7 has also arroved.

Version 6.1 of Angular, Google’s popular JavaScript framework for building mobile and desktop applications, is here, with the first production release available. Angular provides dependency injection, particularly useful for assembling data services for applications, along with use of an HTML template to compose components. Angular 7 became available in beta in early August, but developers should not expect too much from it yet. Angular’s builders follow a process in which a fresh beta is delivered each week until the stable release of Version 7, which is due in September or October 2018. Continue reading


Policy-Based Client-Side Encryption in Angular – Angular In Depth

— David WheelerAccess control defines which users or system processes are granted access to data, as well as what operations are allowed to be performed on that data. Many privacy and security incidents are the result of either bypassing the access control layer to gain direct access to the underlying data or by exploiting inevitable bugs in complicated access control logic. Encryption algorithms are used to mathematically prove that only users with a valid cryptographic key are able to access data subject to their roles and permissions. Data is decrypted only at the point of use by authorized users or system processes, with access control enforced cryptographically, and all operations logged as part of an audit trail. Here we are encrypting data at its point of origin to a data classification (e.g., decide later who has access to that data classification or group through a cryptographic action that adds users to that data classification or group. Continue reading


Understanding Providers, Services, and Factories in Angular

I’ve read quite a few posts (as well as questions posed) about the differences between services and factories in Angular. With the factory approach you can specify a function to resolve your dependencies and then return an object that uses them, like this:

Notice that the outer function takes a dependency on a service called “myAlert”. The end result is exactly the same, so your choice of factory or service should be based on your preference for supplying the instance – do you prefer to create classes and pass the constructor function, or would you rather return something explicitly from a factory function? The provider looks like this:

It contains an internal variable for configuration, exposes a method to configure it, and supplies a $get method to generate the instance (in this case, we’re using the inline annotation to inject the $window service). If I wanted to make the optional date a parameter and not a configuration option, I would do away with the provider and just use a service or a factory. Continue reading


Leverage Structural Directives to Create Powerful Components in Angular

In this article, we’ll learn how to create a powerful drop-down component with the help of structural directives. For the selected option:
For each option:
Nothing fancy here, we are just injecting the TemplateRef in both directives so that we can use them later in the parent component. Now let’s get a reference to these directives in the nb-dropdown component and render the templates in the appropriate places. We can use the ngTemplateOutlet directive to embed a view from a prepared TemplateRef and the ngOutletContext input to pass a context to the embedded view ( this is for the let-selected part ). Summary
We saw how we could create a powerful component with the help of structural directives. Continue reading

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