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Today in Top Angular News – Friday, September 28

Today in Top Angular News – Friday, September 28

Today’s topics include Angular, html5, ReactJS, CSS, javascript, Angular5, Angularjs, Node, Tutorial, javascript30, typescript, angular6, and Ajax. Special thanks to contributors +Yatin, Yatin, by Rehmaanali, rehmaanalis, @NetanelBasal, Netanel Basal, @stephenfluin, Stephen Fluin, Praveen0849, @maxim.koretskyi, Max NgWizard K, +Ramesh Kotha, Ramesh Kotha, webcodegeeks, Maina_Wycliffe, NG_Tutorial, and Adi_b2.


Angular.js Step by Step Beginner Tutorial

Hello readers, in this basic example, developers will learn what AngularJS is and how to start writing the code using the AngularJS framework. 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. It will have the following code:

Let’s create a basic welcome application to understand the basic building blocks of AngularJS library. In this section, developers learned how to create a simple application using the AngularJS library. Developers can download the sample application as an Eclipse project in the Downloads section. Continue reading


Optimizing the Performance of Your Angular Application

Using OnPush
By default, Angular runs change detection on all components every time something changes in your app — from a click event to data received from an ajax call. We are going to pass an array of skills to the select component and will set the properties as “getters” so we can see when Angular checks the values. We can set the ChangeDetectionStrategy of our component to This tells Angular that the component only depends on his Inputs ( aka pure ) and needs to be checked in only the following cases:
The Input reference changes. You run change detection explicitly by calling none of the conditions mentioned above occurred, Angular will not check the component at the current change detection cycle. For example:
The problem is, because Angular needs to re-run your function in every change detection cycle, if the function performs expensive tasks, it can be costly. Continue reading


Getting to Know the Angular CDK Drag and Drop Feature

cdkDragHandleSortable Example
Adding the cdk-drop around a set of cdkDrag elements groups the draggables into a reorder-able collection. Sortable exampleThe package exposes the moveItemInArray method which on drop rearrange the items array according to the indexes. Sortable demoTransferring Items between Lists
The cdk-drop component supports transferring dragged items between connected drop zones. If the user is dragging an element within the same container, we perform a sortable action; otherwise, we transform the value from one collection to the other using the built-in transferArrayItem() method. ( note that this method mutates the array )

enterPredicate
The enterPredicate input expects a function that is used to determine whether an item is allowed to be moved into a drop container. Continue reading


The Past, Present, and Future of the Angular CLI – Angular Blog

The Past, Present, and Future of the Angular CLI
The Angular CLI is a command-line interface for building Angular applications, and over the last year it has become one of the most essential tools in an Angular developer’s toolbox. npm install —g @angular/cli
ng new my-angular-project
cd my-angular-project
ng serveMoving Quickly
The Angular CLI has made a lot of progress over the last few months, you can view the comprehensive notes about this progress on the releases page, but it can be helpful to look back on what’s happened in the last 4 flag
The minimal flag allows developers to generate a smaller, simpler default project. Now, to keep bundles as small as possible, we extract these licenses into a separate 3rdpartylicenses.txt file and remove any duplicate size improvements
With each release, we work hard to try to improve the quality of the code that the CLI generates with production builds. Learn more about setting up your Angular CLI project to generate server optimzed bundles on the wiki:
Initial Support for early betas of v5
Angular makes major releases approximately every 6 months. Here are a few of the ideas the team hopes to (but doesn’t promise to) include in future releases:
Ahead of Time Compilation mode by default — The Angular team is doing a lot of work to make compilation faster, and once the compiler can achieve a similar level of performance to what we see today, we’ll flip the switch and always build with AOT turned on. Continue reading


Top ReactJS Frameworks You Can’t Miss Out in 2018

ReactJS Frameworks has been presented various UI components or libraries and systems began to turn out one by one and it’s proceeding. Developers originating from frameworks, for example, Angular or Ember have difficulties to make sense of all the building blocks they should construct a modern web application with ReactJS as its core. Here is the nice example:

The Ant Design empowers the enterprise-class UI design language reasonably utilized for all the web applications. Ant Design has the arrangement of amazing ReactJS components in a more efficient manner. For example:

This library is a collection of ReactJS UI components that backings Pinterest’s design language, utilized inside Pinterest to make consistency in UI outline and improvement. Continue reading


What’s new in Angular 5? – Quora

Many of the changes in angular 5 has happend under the hood but, let me mention the important ones over here:

As you know, Google has been working on PWA or Progressive Web Application for quite a long time. The second thing the build optimizer does is to remove Angular decorators from your application’s runtime code. Because of this now, you can take advantages of all the new TypeScript features in your angular code bas. The entire life cycle of routes now look as:

Additional events makes life of the developer easier by allowing them to track the router life cycle more efficiently and for example one can display a spinner while some children components are being loaded as shown in the code:

Also, it’s now possible to reload a page when the router receives a request to navigate to the same URL. Angular team has introduced the new number, date, and currency pipes that increase standardization across browsers. Continue reading


Ajax Live Search Using Angular and Node

Live search is one of the most interactive and mandatory part of any web applications. In this tutorial i am going to develop one simple ajax live search box which takes user input and filter result live on the same page. It allows us to put those data which we need for search on client end, so for every key input there is no database call which in turn improves the system performance. On first request it will render the home page of application and on second router request it will load the values from database. This line basically performing search in loaded_demos which is nothing but data from database. Continue reading


A curious case of the @Host decorator and Element Injectors in Angular

Suppose you have a component’s template with one element and two directives A and B applied to it:
The definition that Angular creates for this template includes the following metadata for the element:
As you can see, this node definition defines element.publicProviders property that acts as an injector with two providers ADirective and BDirective. Nested HTML elements make up a hierarchy of DOM elements and in Angular’s DI system these elements constitute a hierarchy of element injectors within a component’s view. For example, the following template:
where adir declares a provider creates a hierarchy of two element injectors — parent injector created on the element and the child injector created on the a-comp element. Here is a diagram that demonstrates this behavior:
Resolution process
Setting up a hierarchy between element injectors inside a component’s view simplifies the resolution process in element injectors. This is typical markup for a template driven form:
Under the hood, the form element is matched by a selector of the NgForm directive that registers itself as a ControlContainer provider:
The ngModel directive, in turn, injects a parent form using the same ControlContainer token and uses it to register a control with the form:
As you can see, it uses the @Host decorator to restrict the resolution process only to the current component’s template. Continue reading


Angular 4 Installation

  • need to install the angular cli to use the ng command.

-& Install Node.js

First you need to install the node.js in your system to get the access of use npm commands. Generate a new project by running the below command:

It takes some time to create the project. -& Serve the application

Go to the project directory and launch the server. The ng serve command launches the server, watches your files, and rebuilds the app as you make changes to those files. Continue reading


AngularJS Data Bindings Example

Hello readers, data binding in an angular library is a data synchronization process between the Model and the View components. The data binding acts as a communication medium between the Model and the View components of an application. In angular, a model works as an application source and View as an angular model projection.Below are the two types of data bindings that are available in the angular library. It will have the following code:

Let’s create an application to understand the basic building blocks of the two-way data binding in the angular library. In this section, developers learned how to create a simple two-way data binding application using the angular library. Continue reading


Role Based Authorization in Angular – Route Guards – The InfoGrid

In this post, we shall use JSON Web Tokens (JWTs), which will contain the user role of the current user. The JWT token, shall have a user role added to it on the server, after signing in together with other user details such as email, username, full name etc. This way, each route shall be aware of the roles it will allow access to it and you can just check the user role against allowed roles:

So, in the case of author route, we shall allow users with author and admin role. It will accept allowed roles string array and check whether current user role is among the roles that are allowed:

Next, add the service to the list of providers in the app module:

Next, let’s add a route guard to our app. So, inside both two methods, we need to first get the allowed roles for that route:

Then, check if the user is authorized to access the route:

So, I our canActivate method will look like this:

Now, let’s add the guard to our parent route:

And that’s it, we have a role-based authorization for our angular application. Continue reading


AngularJS Ajax Call Example

Hello readers, in this basic example, developers are going to call the Ajax in the angular framework while reading the data from the server. The angular framework provides the services and is used to do the HTTP request to retrieve the desired data from the server. In angular ajax, developers can send the Ajax requests in multiple ways, such as:

is the core angular service used to do the HTTP requests to communicate with the remote servers and retrieve the required data through the browser’s object or the . To access the angular ajax in a controller, developers will have to use the object i.e. service retrieve the data from the server in the following way. In this section, developers learned how to create a simple application using the angular ajax. Continue reading

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