Ionic 4/Angular Modals - Tutorial

First of all, We need to mention that we are using the Ionic CLI 4 so if you didn't yet upgrade to this release make sure to use the equivalent commands for Ionic CLI prior versions.

Generating a New Ionic 4/Angular Project

Before implementing our modal example, let's first generate a brand new Ionic 4 project based on Angular.

Go ahead and open your terminal window then type the following command:

ionic start ionic-modals blank --type=angular

Next, navigate inside your project directory and serve your app using the following command:

cd ionic-modals
ionic serve 

You should be able to visit your app by going to the http://localhost:8100 address.

Importing and using ModalController

Open src/pages/home/home.ts then import ModalController from ionic-angular:

import { ModalController } from 'ionic-angular';

Next we need to inject via component constructor:

@Component({
selector: 'page-home',
templateUrl: 'home.html'
})
export class HomePage {
constructor(public navCtrl: NavController,public modalCtrl : ModalController) {
}
}

Opening a Modal Page

The next step is to add the openModal() method to the HomePage component and bind it to a button on the home.html file:

public openModal(){

}
<button ion-button (click)=“openModal()”>Open Modal</button>

Before adding an implementation for the openModal() method, let’s first add a new page to be used by our modal.

Head to your terminal inside your project folder and run the following command:

ionic g page ModalPage

Then in the home.ts file, use the create() method of ModalController to create a modal and then show it:

public openModal(){ var modalPage = this.modalCtrl.create(‘ModalPage’); modalPage.present(); }

Now if you click on open modal button you should be able to see a modal page popups.

Closing the Modal Page

We have added a method for opening a modal, now let’s add a method to close the modal page once it is opened.

Open the src/pages/modal/modal.tsthen add thecloseModal()method to theModalPage` component:

public closeModal(){

}

Then open the src/pages/modal/modal.html file and add a button to close the modal:

<ion-header>

<ion-navbar>

<ion-title>ModalPage</ion-title>

<ion-buttons end>

<button ion-button (click)=“closeModal()”>Close</button>

</ion-buttons>

</ion-navbar>
</ion-header>
<ion-content padding>
</ion-content>

Now let’s implement the closeModal() method.

First we need to import ViewController from the ionic-angular package:

import { ViewController } from ‘ionic-angular’;

Inject ViewController via component constructor:

export class ModalPage {

constructor(public viewCtrl : ViewController ) {

}

Next, use the dismiss() method to close the modal:

export class ModalPage {

constructor(public navCtrl: NavController, public viewCtrl : ViewController ,public navParams: NavParams) {

}

public closeModal(){

this.viewCtrl.dismiss();

}
}

Passing Data to Modal Page Component

You can also pass some data to a modal page component using the second parameter of the create() method. Passed data can be of any type: string , number or object.

Go ahead, change the openModal() method to pass some data object:

public openModal(){

var data = { message : ‘hello world’ };

var modalPage = this.modalCtrl.create(‘ModalPage’,data);

modalPage.present();

}

Now let’s get the passed parameters using NavParams:

@IonicPage()

@Component({

selector: ‘page-modal’,

templateUrl: ‘modal.html’,

})

export class ModalPage {

constructor(public navCtrl: NavController, public viewCtrl : ViewController ,public navParams: NavParams) {

}

public closeModal(){

this.viewCtrl.dismiss();

}

ionViewDidLoad() {

console.log(‘ionViewDidLoad ModalPage’);

console.log(this.navParams.get(‘message’));

}
}

Conclusion

This is the end of this tutorial. We have seen how to use modals in Ionic 4/Angular.

Originally published  at  techiediaries.com on 01 Aug 2019

==========================================

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Install Angular - Angular Environment Setup Process

Angular is a TypeScript based framework that works in synchronization with HTML, CSS, and JavaScript. To work with angular, domain knowledge of these 3 is required.

1. Installing Node.js and npm
2. Installing Angular CLI
3. Creating workspace
4. Deploying your First App

In this article, you will get to know about the Angular Environment setup process. After reading this article, you will be able to install, setup, create, and launch your own application in Angular. So let’s start!!!

Install Angular in Easy Steps

For Installing Angular on your Machine, there are 2 prerequisites:

• Node.js
• npm Package Manager

Node.js

First you need to have Node.js installed as Angular require current, active LTS or maintenance LTS version of Node.js

Download and Install Node.js version suitable for your machine’s operating system.

Npm Package Manager

Angular, Angular CLI and Angular applications are dependent on npm packages. By installing Node.js, you have automatically installed the npm Package manager which will be the base for installing angular in your system. To check the presence of npm client and Angular version check of npm client, run this command:

1. npm -v

Installing Angular CLI

• Open Terminal/Command Prompt
• To install Angular CLI, run the below command:

1. npm install -g @angular/cli

· After executing the command, Angular CLI will get installed within some time. You can check it using the following command

1. ng --version

Workspace Creation

Now as your Angular CLI is installed, you need to create a workspace to work upon your application. Methods for it are:

• Using CLI
• Using Visual Studio Code

1. Using CLI

To create a workspace:

• Navigate to the desired directory where you want to create your workspace using cd command in the Terminal/Command prompt
• Then in the directory write this command on your terminal and provide the name of the app which you want to create. In my case I have mentioned DataFlair:

1. Ng new YourAppName

• After running this command, it will prompt you to select from various options about the CSS and other functionalities.

• To leave everything to default, simply press the Enter or the Return key.

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Pros and Cons of Ionic Development

Entrepreneurs around the world want a top-notch mobile application for their business in both Android and iOS platforms. Most of them get stuck mid-way where they struggle to pick the best technology suitable for their business. From questions such as native mobile development or cross-platform development? Flutter or Ionic or React Native?. Each technology and development approach has its own Pros and Cons from which you will need to choose the right one for your business. If you think Ionic is the right cross-platform application development, here are a few pros and cons of Ionic development. 

What is Ionic Framework?

Being an open-source SDK for building Hybrid mobile applications in both Android and iOS platforms, Ionic is the best choice for building top of the line mobile applications. This Ionic framework is completely based on Apache Cordova and Angular. More precisely, Ionic is an npm module that requires the installation of Node JS to function.

One can build a full functioning mobile application in both platforms using their Javascript, HTML, and CSS knowledge without requiring the basics of Kotlin or Java. More than 5 Million mobile applications are built using this Ionic framework by leveraging its platform-specific UI elements, innumerable libraries, and more exciting features.

The applications that are built using the Ionic framework are cross-platform, web-based, and have access to native device’s APIs.

Ionic Applications are

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• Web-based – Built using web-views and can be displayed in a browser like PWAs.
• Access to native API components – They can access native device’s camera, files, and others.

Advantages of Ionic Development

Quick Development and Time To Market

For entrepreneurs and business owners, ionic development can be beneficial if they want to develop a mobile application in both platforms in a short period of time while comparing to native applications. Building native applications specifically for each platform can be time-consuming which can imply a delay in time to market and development cost of native applications are generally expensive.

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Wondering how to upgrade your skills in the pandemic? Here's a simple way you can do it.

Corona Virus Pandemic has brought the world to a standstill.

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And for the technology-loving people like us, Knoldus Techhub has already helped us a lot in doing it in a short span of time!

If you are still not aware of it, don’t worry as Georgia Byng has well said,

“No time is better than the present”

– Georgia Byng, a British children’s writer, illustrator, actress and film producer.

No matter if you are a developer (be it front-end or back-end) or a data scientist, tester, or a DevOps person, or, a learner who has a keen interest in technology, Knoldus Techhub has brought it all for you under one common roof.

From technologies like Scala, spark, elastic-search to angular, go, machine learning, it has a total of 20 technologies with some recently added ones i.e. DAML, test automation, snowflake, and ionic.

How to upgrade your skills?

Every technology in Tech-hub has n number of templates. Once you click on any specific technology you’ll be able to see all the templates of that technology. Since these templates are downloadable, you need to provide your email to get the template downloadable link in your mail.

These templates helps you learn the practical implementation of a topic with so much of ease. Using these templates you can learn and kick-start your development in no time.

Apart from your learning, there are some out of the box templates, that can help provide the solution to your business problem that has all the basic dependencies/ implementations already plugged in. Tech hub names these templates as xlr8rs (pronounced as accelerators).

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If you are looking for a template that’s not available, you can also request a template may be for learning or requesting for a solution to your business problem and tech-hub will connect with you to provide you the solution. Isn’t this helpful 🙂

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Basics of Angular: Part-1

What is Angular? What it does? How we implement it in a project? So, here are some basics of angular to let you learn more about angular.

Angular is a Typescript-based open-source front-end web application platform. The Angular Team at Google and a community of individuals and corporations lead it. Angular lets you extend HTML’s syntax to express your apps’ components clearly. The angular resolves challenges while developing a single page and cross-platform applications. So, here the meaning of the single-page applications in angular is that the index.html file serves the app. And, the index.html file links other files to it.

We build angular applications with basic concepts which are NgModules. It provides a compilation context for components. At the beginning of an angular project, the command-line interface provides a built-in component which is the root component. But, NgModule can add a number of additional components. These can be created through a template or loaded from a router. This is what a compilation context about.

What is a Component in Angular?

Components are key features in Angular. It controls a patch of the screen called a view. A couple of components that we create on our own helps to build a whole application. In the end, the root component or the app component holds our entire application. The component has its business logic that it does to support the view inside the class. The class interacts with the view through an API of properties and methods. All the components added by us in the application are not linked to the index.html. But, they link to the app.component.html through the selectors. A component can be a component and not only a typescript class by adding a decorator @Component. Then, for further access, a class can import it. The decorator contains some metadata like selector, template, and style. Here’s an example of how a component decorator looks like:

@Component({
    selector: 'app-root',
    templateUrl: 'app.component.html',
    styleUrls: ['app.component.scss']
})

Role of App Module

Modules are the package of functionalities of our app. It gives Angular the information about which features does my app has and what feature it uses. It is an empty Typescript class, but we transform it by adding a decorator @NgModule. So, we have four properties that we set up on the object pass to @NgModule. The four properties are declarations, imports, providers, and bootstrap. All the built-in new components add up to the declarations array in @NgModule.

@NgModule({
declarations: [
  AppComponent,
],
imports: [
  BrowserModule,
  HttpClientModule,
  AppRoutingModule,
  FormsModule
],
bootstrap: [AppComponent]
})

What is Data Binding?

Data Binding is the communication between the Typescript code of the component and the template. So, we have different kinds of data binding given below:

• When there is a requirement to output data from our Typescript code in the HTML template. String interpolation handles this purpose like {{data}} in HTML file. Property Binding is also used for this purpose like [property] = “data”.
• When we want to trigger any event like clicking a button. Event Binding works while we react to user events like (event) = “expression”.
• When we can react to user events and output something at the same time. Two-way Binding is used like [(ngModel)] = “data”.

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Angular Tutorial | Angular Tutorial For Beginners | Angular Training | Intellipaat

In this Angular tutorial you will learn what is angular, angular architecture, what is typescript, Data binding & interpolation, angular components, Variable Declaration & Function Declaration, Encapsulation & Polymorphism in Angular, Angular Routing and Navigation, various angular basic & advanced concepts, hands-on demo on how to import & export data in angular, Angular JS vs Angular vs React JS and angular CLI among others.

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