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Today in Top Angular News – Monday, January 7

Today in Top Angular News – Monday, January 7

Today’s topics include Java, JavaScript, Angular, PWA, React, vuejs, reactjs, angularjs, frontend, redux, 100DaysOfCode, CodeNewbie, 301DaysOfCode, domorecode, ag, Angualr5, AngularCLI, ts, typescript, polymer, webcomponents, webdev, object, validation, nodejs, metor, reactnative, ionic, and WebDeveloper. Special thanks to contributors +Aleksey Novik, Aleksey Novik, Paul Krill, @abampakos, Aristeidis Bampakos, @javier.ramos1, Javier Ramos, @ogurinkabenjamin, Ogurinka Benjamin, CĂ©dric Exbrayat, Github, Ninja Squad, Twitter, cexbrayat, @aaronverones, Aaron Verones, @maxim.koretskyi, Max NgWizard K, by Rehmaanali, rehmaanalis, carlbergenhem, @mohamed_larbi.chouaiar, CHOUAIAR Mohamed larbi, mbcrump, @janker.christ, Christian Janker, and oussamahamdaoui.

Angular 2 coming to Java and Python: the first multi-language full stack platform?

Angular Universal is a core Angular project for enabling the use of Angular 2 on a Node.js server for the purposes of server side rendering. To see this in action, this is a simplified version of what an express server rendering Angular 2 components looks like:

Whats going here is the following:

There is another important element going on, the Angular router is also active on the server side. The way that the Angular 2 router works on the server is that if the user gets sent a direct link to some route inside the application, for example the server side version of the router will then take the route path and use it to determine which component should be rendered. Server side rendering has become popular for example in the React community, as it allows product organizations to build single page applications that do not suffer from search engine indexability issues, and give the user a much enhanced user experience. Its not only about solving SEO issues for single page apps, using Angular on the server allows an enhanced user experience and to have the same app work in a wider range of devices. Continue reading

What’s new in Angular Version 7

  • You can download the Angular 7 production release from GitHub.

The release candidate for Version 7.2 of Angular, Google’s popular JavaScript framework for building mobile and desktop applications, is now available. Angular provides dependency injection, particularly useful for assembling data services for applications, along with use of an HTML template to compose components. In Angular, developers still compose components with an HTML component that connects to TypeScript code for imperative parts of the program. Continue reading

Naming of @Output events in Angular
What name should I chooseWe should be very careful when declaring an output event in an Angular component, especially with the name of the Output decorator. The application
Consider the following application that consists of two Angular components communicating each other using an output event. The component emits a select output event when the value of the select element second component, AppComponent, which is the main component of the application, binds to the select event of theExportComponent and sets its msg property when emitted. For example, in HTML, select events can be dispatched only on form input type="text" and textarea elements.That is, by giving our output event the name select, we accidentally created a conflict with the select native event of the textarea element. Conclusion
We should not use output and input names that collide with either a native property/event name or even an input/output name used by any other component or directive. Continue reading

How does Angular 2 Change Detection Really Work ?

So let’s dig deeper into change detection by going over the following topics: (sample code is here):

Angular 2 can detect when component data changes, and then automatically re-render the view to reflect that change. Angular uses Zones internally to trigger change detection, but another possible use would be to do application profiling, or keeping track of long stack traces that run across multiple VM turns. The following frequently used browser mechanisms are patched to support change detection:

In fact many other browser APIs are patched by Zone.js to transparently trigger Angular 2 change detection, such as for example Websockets. Imagine what it would be if the Angular 2 default change detection mechanism would be based on reference comparison of component inputs instead of the default mechanism? One of the important properties of Angular 2 change detection is that unlike Angular 1 it enforces a uni-directional data flow: when the data on our controller classes gets updated, change detection runs and updates the view. Continue reading

Introduction to Web Components – Javier Ramos – Medium

Web Component LogoWeb components are a set of web platform APIs that allow you to create new custom, reusable, encapsulated HTML tags to use in web pages and web apps. Custom components and widgets build on the Web Component standards, will work across modern browsers, and can be used with any JavaScript library or framework that works with HTML. The idea behind web components is to create dynamic interface elements without writing custom JavaScript code or building your own libraries. Building Blocks
Web Components have 4 major building blocks:
Custom Elements
With custom elements we can create custom html tags, or enhance existing tags and components. It takes popular modern web development concepts (such as Virtual DOM, async rendering, reactive event flow and TSX) and creates clean, standard-based web component code. Continue reading

Before learning a Javascript framework, you should;
Know the basics of Javascript : Before even thinking of a framework you should at least be comfortable and knowledgeable with the basic concepts of Javascript, ranging from an understanding of Variables, Arrays, Objects, Functions, DOM, Conditionals and Loops, Data type, Error Handling and Events. This is important because these are concepts that you will find yourself using often when working in a framework and you don’t want to be lost when you come across them
Not a must, but please know a bit of ES6: ES6 introduces pretty cool additions to Javascript and while I will not go into listing or explaining all of them, I will mention a few of them you should look out for. The answer is simple, most of the popular Javascript frameworks have alot of these concepts present in them and if you have no idea what they are, you’ll end up being like “Oh, I guess module.exports is a vue thing". Understanding ES6 helps you tell the difference between something that is part of the framework and what is actually Javascript. Well, don’t get overwhelmed by everything I mentioned cause in all fairness you could start learning a framework after grasping the basic concepts of Javascript. Continue reading

What’s new in Angular 7.2?

Not a lot of new features in this release: the Angular team is still mainly focused on the Ivy project, rewriting the Angular compiler and runtime code to make it smaller, better, faster. I was mentioning in our article about Angular 7.1 that the Bazel support was making progress, and this 7.2 release brings a cool new feature. You can override this behavior by using another value for this option like , to also trigger the guards and resolvers if a query parameter changes, or to trigger them if anything changes. Using this value, the guards and resolvers will run if a path parameter changes, but not if a query or matrix parameter changes. using this value, the guards and resolvers will run if a path parameter or a query parameter changes, but not if a matrix parameter changes. Continue reading

scss file:
cd src
mkdir styles
rm styles.scssThen I created a main.scss file in the new styles folder,
cd styles
touch main.scssand updated angular.json so that it looks for this new file. "styles": [
"scripts": [
created the remaining folders in the styles directory. mkdir abstracts base layout themesThen I created a few of the sass partial files I knew I would be using
cd abstracts
touch _variables.scss _functions.scss _mixins.scss _placeholders.scsscd . A shame file is one where you put all the hacks you’re not proud of so that they don’t get lost and ignored. touch _shame.scssThe import for the shame file goes at the bottom of main.scss . Continue reading

Get started with Angular Grid in 5 minutes – ag-Grid – Medium

ag-Grid and its Angular grid component can be easily integrated into any Angular project bundler setup. component.html in your favorite text editor and add the ag-grid-angular component to the markup:
style="width: 500px; height: 500px;"

/ag-grid-angularThe HTML above includes a wrapper DIV element which sets the grid dimensions and specifies the grid's theme by setting the className to ag-theme-balham. Angular Grid Sorting
Enabling sorting in ag-Grid is actually quite simple — all you need to do is set the enableSorting property to true on the ag-grid-angular component:
the property is added, you should be able to sort the grid by clicking on the column headers. Angular Grid Filtering
As with sorting, enabling filtering is as easy as setting the enableFilter property to true:
this property is set, the grid will display a small column menu icon when you hover over the header. Angular Grid Pagination
To enable pagination in our Angular grid, all you need to do is set the pagination property to true on the ag-grid-angular component:
adding the property, you should be able to move through the pages by using the controls at the bottom of the grid:
By default the grid uses a page size of 100 records, but it can easily be changed through configuration options. Continue reading

ngFor in Angular 5 Instead of ngRepeat

As we have seen in AngularJS to repeat the loop, we have to use the angular’s directive named as . As the new Angular 5 feature comes with the same functionality but its directive is named as . For previous AngularJS version we have to simply just import or linked the library in the project, but now the Angular 5 (TypeScript) has its requirements such NodeJS and Git Version Control (optional), Can be used from windows command prompt. on running the this will open up a pre build component of Angular Documentation

After installation, let’s create a component for any view but the scope of this tutorial was to learn about ngFor

Check out what are components? In AngularJS to display the data from an array as a list, we would use the directive, In Angular 5 we have the directive. Continue reading

Editor Overview – Components – Kendo UI for Angular

  • For Angular 6, install the package.

Either use the quick setup (Angular CLI v6 or later) or manually add the package (Angular CLI v5 or earlier). Angular CLI v6 supports the addition of packages through the command which executes in one step the set of otherwise inidually needed commands. import { Component, NgModule } from '@angular/core'; import { RouterModule } from '@angular/router'; import { CommonModule } from '@angular/common'; import { EditorModule } from @NgModule({ declarations: [ AppComponent, ], imports: [ RouterModule.forChild( [{ path: '', component: AppComponent }] ), CommonModule, EditorModule ] }) export class AppModule {} You are required to install one of the Kendo UI themes for Angular to style your component. The Editor package requires you to install the following peer dependencies in your application:

The following dependencies are automatically installed:

The following example demonstrates the event of the Editor. Continue reading

Create your Vue.Js component and use it everywhere – CHOUAIAR Mohamed larbi – Medium

npm install -g vue-cliand then to create your new project you can run:
vue create enter the name of your appBeside package.json, which contains the configuration, these are the files contained in your initial project you run yarn serve you get your first example running and displaying this:
Let’s create our first vue custom element
for demo purposes, I’ll create another component called ButtonCounter that is going to emit a counter of how many times it was clicked to it’s parent and the grand parents. To use your newly built VueJs custom element, you need only to import it to an html file like any other javascript code, import the VueJs library; because it’s not included deliberately in the build. Here is an example of a Polymer component using my-custom-element; Vue custom element created previously. In this example you can see how to use the Custom element inside an Angular component. To use your Vue custom element inside React app you need to import it as any Javascript file into the index.html file in addition to the Vue library. Continue reading

Upload Small Files to a Web API Using Angular

Check out his videos at you need to upload files to your server from an Angular application to a Web API method. Add the code shown below to this file:

The above code creates the route for the FileUploadController, sets up a constant with the path to a folder on your local hard drive that your Web project has permissions to write to, and sets up the Post() method to which you send an object of the type FileToUpload. Let's move on and create an Angular project to upload files to this Web API. Enter the following Angular CLI command in the terminal window to create a new Angular application:

Once the project is created, add the newly created folder named FileUploadAngular to VS Code. The FileToUpload class is needed so you can pass the data about the file to upload to the Web API. Continue reading

Having Fun with Mixins in Angular – codeburst

Typically, the mixin will export services to a child class, but no semantics will be implied about the child “being a kind of” the parent — [1]In my own words: Mixins are a special kind of class inheritance. Have a look at the Color Mixin:
Before the introduction of Mixins in Angular Material, the same code was copied and pasted again and again over multiple components. In Angular Applications I often see very big container components that connect all kind of data from the store and do additional business logic on them. In order to be able to use the dependency injection of Angular we have to add the class CounterViewBase in between and extend the container from the created Mixins class. But the world is not just black or white, and for component libraries like Angular Material using Multiple Inheritance via Mixins does make sense. Continue reading


  • The rule checks every element of the array against the rule.

Go check the Quick start section and start coding with love

Install it via npm by running

You can get custom error messages by doing this:

You can test over multiple arrays using this method:

A object validates a single value, it can be used like this:

The only required value is ! To explain result, what's better than an example:

These types 'inherit' from string, they have both the properties, here are some examples:

Forgjs tries to cast the value to the right type before passing it to the validation function please be careful! Here is an exemple where Javascript behaviour makes the test wrong:

You can check for multiple types with or operators like this:

This means the test should verify the , or rule

Every type has these properties:

If optional is set to the element is optional and an value is considered correct. Example:

Custom allows you to write your own rule, an example is better than a long explanation:

One of checks if the element is in a array

Creating a new type is done using the Rule class like this:

Thank you everyone for contributing to make this code better, if you have suggestions or ideas to improve the code please feel free to leave a comment here #29. Continue reading

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