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Today in Top Angular News – Saturday, September 22

Today in Top Angular News – Saturday, September 22

Today’s topics include AngularJs, JavaScript, Angular6, Angular2, dotnetcore, AspNetCore, medium, article, and React. Special thanks to contributors @maxim.koretskyi, Max NgWizard K, Rajeev Hathi, The serverless webpack authors, @palmer_todd, Todd Palmer, Cédric Exbrayat, Github, Ninja Squad, Twitter, cexbrayat, Akash Singh Chauhan, @maxim.koretskyi, Max Wizard K, View all posts by Nishu Goel, by Rehmaanali, rehmaanalis, abubakar1005, ngHeidelberg, and @dleroari, Dler Ari.


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

Integration
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:
ag-grid-angular
style="width: 500px; height: 500px;"
class="ag-theme-balham"
[rowData]="rowData"
[columnDefs]="columnDefs"

/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:
ag-grid-angular
[enableSorting]="true"
[rowData]="rowData"
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:
ag-grid-angular
[enableFilter]="true"
[rowData]="rowData"
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:
ag-grid-angular
[pagination]="true"
[rowData]="rowData"
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


Upgrade Angular 5 app to Angular 6 with Visual Studio 2017 #angular #angular5 #angular6

Upgrade Angular 5 app to Angular 6

ng update @angular/cli

Once this command is completed successfully, you can see the angular.json file in the solution explorer. To do that, run the following command:
ng update @angular/core

All the Angular framework packages are upgraded to Angular 6. The default ASP.NET Core SPA template doesn’t use Angular Material, but if you are using it in your app, update Angular Material to the latest version by running the following command:
ng update @angular/material

Next, run ng update to identify and update other dependencies. The error output was: Unknown option: ‘–extractCss’

This is because the ng serve command no longer supports –extractCss option. To fix this, remove the –extract-css option from the ng serve command in the scripts section of package.json file. Continue reading


AngularJs 2 Series: Build Your Own Directive

Apart from being associated as HTML tags with components, directives also comes in two other forms: Attribute and Structural. I will show you how to develop a custom attribute or property to an HTML element or tag which can then be associated to a component selector to render the desired output. We will create a highlight attribute directive that will highlight the text background to yellow color. It means we have created a highlight attribute directive and therefore it can be associated to a component displaying text that needs to be highlighted with yellow color. Open the template file and add our newly created highlight attribute directive to the HTML snippet as shown below:

As you can see above, we have placed attribute to the HTML tag that will highlight the text. Continue reading


Creating a Color Picker Component with Angular

Also, we want to make sure, that the color-picker component is exported, so it can be used outside of the module:

Finally, we import the color-picker module into the app module

and use the color-picker component in the apps' template:

The first thing we are going to create is the vertical slider on the right side of the picker. This method is reading the the color at the selected position and is emitting it using the components color-emitter;

As you can see, this method is using another method called getColorAtPosition. This method is using the canvas context to read out the color at the given position. Based on this hue, the gradients in the draw method have a different color. Also, there are some wrappers…

Of course, we also need to provide the two properties "hue" and "color" in our component class:

Hue is the result of the color-slider, whereas color is the result of the color-palette. Continue reading


Angular Testing with Headless Chrome – Angular In Depth

  • We want configure our E2E tests to run using Headless Chrome.

Angular Testing with Headless Chrome
Configuring Angular CLI to leverage Headless Chrome for Unit and E2E tests
Headless Chrome is a useful tool for running automated tests in environments where it isn’t practical to actually launch a browser. In this article we explain how to configure Angular CLI to run your Unit and E2E Tests using Headless Chrome. It should look something like this:
"scripts": {
"ng": "ng",
"start": "ng serve",
"build": "ng build",
"test": "ng test",
"test-headless": "ng test –watch=false –browsers=ChromeHeadless",
"lint": "ng lint",
"e2e": "ng e2e"
},Note the flags:
–watch=false
Specifies that we only want the tests to run once and then exit instead of watching for that we want to use Headless Chrome as the browser for the tests. Now to run our unit tests with Headless Chrome we can use:
npm run test-headlessE2E Tests
When we create a new work space using Angular CLI, it configures Protractor to run our End-to-End tests (E2E). Continue reading


Angular Performances Part 3 – Profiling and runtime performances

This is the third part of this series (check the first part and the second one if you missed them), and this blog post is about how you can profile the runtime performances of your Angular application and how you can improve these runtime performances. The Angular team recommends to have a time per check below 3ms, to leave enough time for the application logic, the UI updates and browser’s rendering pipeline to fit within the 16 milliseconds frame (assuming a 60 FPS target frame rate). Angular’s magic relies on its change detection mechanism: the framework automatically detects changes in the state of the application and updates the DOM accordingly. When you have a collection of 3 ponies and want to display them in a list, you’ll write something like:

When you add a new pony, Angular will add a DOM node in the proper position. With this , Angular will only recreate a DOM node if the id of the pony changes. Continue reading


React Vs. Angular: Still Confuse Which JavaScript Framework To Pickup?

However, the final step deciding between the Angular or React is the toughest call you are going to make as a front-end web  developer. Angular is a complete Javascript framework embedded with enormous features compared to React which is just a UI component library. Here are some of the most useful features of Angular

These beneficial features could help the developers in coming up with an intuitive web app. Besides, with all these features already present inside the tool, the developer doesn't need to waste their time in searching the libraries. Both React and Angular are the open source frameworks, that means you can make the changes accordingly as there is no restriction about commercial apps and usage. Continue reading


How to manually bootstrap an Angular application – Angular In Depth

Let’s define these two components:
import { Component } from selector: 'a-comp',
template: `I am A component/`
})
export class AComponent {}

@Component({
selector: 'b-comp',
template: `I am B component/`
})
export class BComponent {}And we register them in the AppModule:
@NgModule({
imports: [BrowserModule],
declarations: [AComponent, BComponent],
entryComponents: [AComponent, BComponent]
})
export class AppModule {}The important thing here is that we don’t register them in the bootstrap property since we will be bootstrapping them manually. Also, since we don’t know whether A or B component will be used we don’t specify there selectors in the index.html, so it now it looks like this:
body
h1 id="status"
Loading AppComponent content here …
/h1
/bodyNow, if you run the application now you will get the following error:
The module AppModule was bootstrapped, but it does not declare “@NgModule. Later, when we will be ready to bootstrap the application we will use bootstrap method of the ApplicationRef to initialize the root component. Let’s define the custom method bootstrapRootComponent that will be responsible for bootstrapping the root component when it becomes available:
// app – reference to the running application (ApplicationRef)
// name – name (selector) of the component to bootstrapfunction bootstrapRootComponent(app, name) { // define the possible bootstrap components
// with their selectors (html host elements) const options = {
'a-comp': AComponent,
'b-comp': BComponent
}; // obtain reference to the DOM element that shows status
// and change the status to `Loaded` const statusElement = statusElement.textContent = 'Loaded'; // create DOM element for the component being bootstrapped
// and add it to the DOM const componentElement = document.createElement(name);
// bootstrap the application with the selected component const component = options[name];
app.bootstrap(component);
}It takes the reference to the ApplicationRef and the name of the component to bootstrap. I’ve also created a mock fetch function that emulates HTTP request to the server and returns b-comp selector within 2 seconds:
function fetch(url) {
return new Promise((resolve) = {
setTimeout(() = {
resolve('b-comp');
}, 2000);
});
}So now that we have our bootstrap function that will bootstrap the root component let’s use it in the ngDoBootstrap method of the module:
export class AppModule {
ngDoBootstrap(app) {
. Continue reading


AngularJs 2 Series: Concept of Services

The log method in each of the components will be removed and placed in the specific logging service class. One more important thing to do is to make our service available to the whole application through the use of meta data. If you provide the service in a main module file then it is visible to whole application. By providing the service at the module level, Angular creates only one instance of class which can be used by all the components in an application. We will create a order success component named that will inject our service class through the constructor to notify the user about the order being processed successfully. Continue reading


Providers in Angular

Read here: Understanding Services and Dependency injection

When we inject a service, the Angular injector needs to look at the Service providers to create an instance of that particular service. The provider determines which instance of the service should be injected at the runtime in the component, module, pipe or directive. On the other hand, the second parameter  has 4 different values:

This is used to avoid creating two instances of the same Service. Inside the new service,

To use useExisting inside the component now,

When we do not want to create an instance but pass the object directly, we use useValue. Here, when the value of i equals 0, the output comes from the first service, i.e., HelloService, in any other case, the output comes from the second service, i.e., NewService. Continue reading


What is `forwardRef` in Angular and why we need it – Angular In Depth

Usage example
Angular documentation shows the following example:
class Door {
lock: Lock;

// Door attempts to inject Lock,
// despite it not being defined yet. So, for example, if you want to access the form directive associated with the input in your custom directive you can do like this:
@Directive({
selector: '[mycustom]'
})
export class MyCustom {
constructor(@Inject(NgControl) directive) {…input type="text" ngModel mycustomTo enable that each both NgModel and formControl directives define a formControlBinding provider and register it in the directive decorator descriptor. Here is how the formControl directive does that:
export const formControlBinding: any = {
provide: NgControl,
useExisting: selector: '[formControl]',
providers: [formControlBinding],

})

export class FormControlDirective { … }and NgModel directive:
export const formControlBinding: any = {
provide: NgControl,
useExisting: NgModel
};@Directive({
selector: '[ngModel]',
providers: [formControlBinding],

})
export class NgModel { … }The interesting piece of the implementation here is that formControlBinding is defined outside the directive class decorator. So when JS runtime evaluates the code that defines the formControlBinding object, the NgModel class definition is not yet evaluated and if we log the provider object to the console we will see the following:
Object {useExisting: undefined, token: function}Ah, useExisting points to undefined and so Angular will not be able to resolve the other token. And that is why Angular uses forwardRef here:
export const formControlBinding: any = {
provide: NgControl,
useExisting: forwardRef(() = class FormControlDirective { … }…export const formControlBinding: any = {
provide: NgControl,
useExisting: forwardRef(() = NgModel)
};

export class NgModel{ … }But would it work if we Angular defined the formControlBinding inside the class decorator without the forwardRef like this:
@Directive({
selector: '[ngModel]',
providers: [
{
provide: NgControl,
useExisting: NgModel
}
],

})
export class NgModel { …
}Well, if you look at the code it seems that NgModel is referenced in the decorator before the class definition. 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


Is Angular 6 or 5 is good for making complex ERP system? Need you suggestions. – Quora

I wrote a CRM with Angular 5, so I can attest to both the performance and environment. Angular is used in some of the largest corporations in the world and you really can’t go wrong with it. Angular 6 is just the next version, and if you are starting a green field project, then there is no reason not to use the latest version. Continue reading


Angular Heidelberg (Heidelberg, Germany)

  • Angular Heidelberg is the Angular meetup for the Rhein-Neckar area!

This meetup is all about the Angular framework (version 2+) by Google and all related technologies. • Location will be at a coworking space (Fensterplatz Heidelberg) OR at the office of a sponsor. There will be developers Heidelberg ist das Angular Meetup für die Metropolregion Rhein-Neckar! In diesem Meetup dreht sich alles um das Angular Framework (version 2+) von Google und alle damit verbundenen Technologien. 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

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