How to Use ngx-datatable Component to create Data Tables in Ionic 4

How to Use ngx-datatable Component to create Data Tables in Ionic 4

In this Ionic 4 Data Tables tutorial, we learn how to use ngx-datatable component to create the data tables in Ionic 4. Learn how to create a data table in an Ionic / Angular app and learn how to show relevant information in tabular form using the ngx-datatable plugin. Create Data Tables with Ionic 4 and ngx-datatable

A complete step by step Ionic 4 Data Table tutorial, create a data table in an Ionic / Angular app and learn how to show relevant information in tabular form using the ngx-datatable plugin.

The purpose of this post is to teach you how to create data tables in the Ionic app quickly. We will take some dummy data and present that beautifully in an interactive tabular format using Angular’s ngx-datatable component.

Data tables are advantageous in showing the relevant information in an orderly manner. The nature of the Data Table is such, and it helps you scan the information more quickly, which leads you to make faster decisions.

Data comparison, visualization, and analysis become so easy due to its rows and columns pattern that accommodates users to examine the necessary data faster.

A useful and attractive data table is created with Rows / Columns, Pagination, Edit mode, Mode of actions and Expanded view components.

Table of Contents

  • Installing Cordova
  • Setting Up Ionic 4 Camera App
  • Adding Platform in Ionic
  • Install Ionic Cordova and Native Camera Plugin
  • Importing Camera Plugin in App Module
  • Using Camera Plugin in Ionic 4 Component
  • Test Camera App in Browser
  • Conclusion
Getting Started

Install the latest version of Ionic CLI on your system.

npm install -g [email protected]

Generate the new ionic project name it ionic-tables-app.

ionic start ionic-tables-app blank --type=angular
cd ionic-tables-app

Enter inside the project folder.

cd ./ionic-tables-app

Run the Ionic app in the browser.

ionic serve
Install and Configure ngx-datatable

Install the ngx-datatable component using following command.

npm install @swimlane/ngx-datatable --save

Once the data table plugin is installed, then import and declare NgxDatatableModule in app/home.module.ts file.

import { NgModule, CUSTOM_ELEMENTS_SCHEMA } from '@angular/core';
import { CommonModule } from '@angular/common';
import { IonicModule } from '@ionic/angular';
import { FormsModule } from '@angular/forms';
import { RouterModule } from '@angular/router';
import { HomePage } from './home.page';

import { NgxDatatableModule } from '@swimlane/ngx-datatable';

@NgModule({
  imports: [
    CommonModule,
    FormsModule,
    IonicModule,
    RouterModule.forChild([
      {
        path: '',
        component: HomePage
      }
    ]),
    NgxDatatableModule,
  ],
  declarations: [HomePage],
  schemas: [CUSTOM_ELEMENTS_SCHEMA]
})

export class HomePageModule { }

If you are getting the given below error, then import the CUSTOM_ELEMENTS_SCHEMA and declare schemas: [CUSTOM_ELEMENTS_SCHEMA] in your Ionic’s page.module.ts file.

# CUSTOM_ELEMENTS_SCHEMA Error in Ionic 4

If 'xx-xxxx' is a Web Component then add "CUSTOM_ELEMENTS_SCHEMA" 
to the '@NgModule.schema' of this component to suppress this message.

Since, we are externally importing the data in the table, so we need to import and register the HttpClientModule in AppModule file. Go to app.module.ts file and add the following code to make the HTTP request.

import { HttpClientModule } from '@angular/common/http';

@NgModule({
  declarations: [...],
  entryComponents: [...],
  imports: [
    HttpClientModule
  ],
  providers: [...],
  bootstrap: [...]
})

export class AppModule { }

We have successfully configured the data table module in our ionic app module, move to the next step, and add some dummy data to show in the Ionic table.

Adding Dummy Data

We are going to create some dummy movies data in JSON format, this data will be displayed in the Ionic tables.

Create a file in the src/assets folder name it movies.json and add the following code inside of it.

{
    "movies": [
        {
            "name": "Escape Room",
            "company": "Columbia Pictures",
            "genre": "Horror"
        },
        {
            "name": "Rust Creek",
            "company": "IFC Films",
            "genre": "Drama"
        },
        {
            "name": "American Hangman",
            "company": "Hangman Productions",
            "genre": "Thriller"
        },
        {
            "name": "The Upside",
            "company": "STX Entertainment",
            "genre": "Comedy"
        },
        {
            "name": "Replicas",
            "company": "Entertainment Studios",
            "genre": "Sci-Fi"
        },
        {
            "name": "After Darkness",
            "company": "Grindstone Group",
            "genre": "Drama"
        },
        {
            "name": "Glass",
            "company": "Universal Pictures",
            "genre": "Superhero"
        },
        {
            "name": "Close",
            "company": "Netflix",
            "genre": "Action"
        },
        {
            "name": "The Final Wish",
            "company": "BondIt Capital",
            "genre": "Horror"
        },
        {
            "name": "Serenity",
            "company": "Aviron Pictures",
            "genre": "Drama"
        },
        {
            "name": "Miss Bala",
            "company": "Columbia Pictures",
            "genre": "Thriller"
        },
        {
            "name": "Velvet Buzzsaw",
            "company": "Netflix",
            "genre": "Comedy"
        }
    ]
}

Given above is the basic data, It is a simple list of Movies with the genre type and the production houses which released these movies.

Adding Style to ngx-datatable in Ionic

In this step, we will learn how to easily add CSS and icons to ngx-datatable in Ionic 4, It will help us to sort out ‘ngx-datatable style not working’ issue.

First, go to assets folder and create styles > ngx-datatable folder inside the assets folder.

Next, copy ngx-datatable’s theme’s CSS files from the following paths.

# node_modules > @swimlane > ngx-datatable > index.css
# node_modules > @swimlane > ngx-datatable > themes > bootstrap.css
# node_modules > @swimlane > ngx-datatable > themes > dark.css
# node_modules > @swimlane > ngx-datatable > themes > material.css

Copy the fonts folder and icons.css from the following path..

# node_modules > @swimlane > ngx-datatable > assets > fonts

# node_modules > @swimlane > ngx-datatable > assets > icons.css

Next, paste data table theme files, fonts folder and icons.css file inside the following path.

# app > assets > styles > ngx-datatable

Now, change the name of these data table files as given below.

_index.css
_bootstrap.css
_dark.css
_icons.css
_material.css

Next, go to app/assets/styles/ngx-datatable/_icons.css file and update data-table @font-face path as given below.

@font-face {
  font-family: 'data-table';
  src: url('./fonts/data-table.eot');
  src: url('./fonts/data-table.eot?#iefix') format('embedded-opentype'), 
    url('./fonts/data-table.woff') format('woff'),
    url('./fonts/data-table.ttf') format('truetype'), 
    url('./fonts/data-table.svg#data-table') format('svg');
  font-weight: normal;
  font-style: normal;
}

Then, we will add the following data table theme paths inside the global CSS file. Add the following path inside the global.scss file.

/*
 * App Global CSS
 * ----------------------------------------------------------------------------
 * Put style rules here that you want to apply globally. These styles are for
 * the entire app and not just one component. Additionally, this file can be
 * used as an entry point to import other CSS/Sass files to be included in the
 * output CSS.
 * For more information on global stylesheets, visit the documentation:
 * https://ionicframework.com/docs/layout/global-stylesheets
 */

/* Core CSS required for Ionic components to work properly */
@import "[email protected]/angular/css/core.css";

/* Basic CSS for apps built with Ionic */
@import "[email protected]/angular/css/normalize.css";
@import "[email protected]/angular/css/structure.css";
@import "[email protected]/angular/css/typography.css";
@import '[email protected]/angular/css/display.css';

/* Optional CSS utils that can be commented out */
@import "[email protected]/angular/css/padding.css";
@import "[email protected]/angular/css/float-elements.css";
@import "[email protected]/angular/css/text-alignment.css";
@import "[email protected]/angular/css/text-transformation.css";
@import "[email protected]/angular/css/flex-utils.css";

/* NGX Datatable CSS */
@import '~assets/styles/ngx-datatable/_index.css';
@import '~assets/styles/ngx-datatable/_dark.css';
@import '~assets/styles/ngx-datatable/_material.css';
@import '~assets/styles/ngx-datatable/_bootstrap.css';
@import '~assets/styles/ngx-datatable/_icons.css';

We have added the styling in Ionic’s data table app. Now, we need to import ViewEncapsulation and register the encapsulation: ViewEncapsulation in the @component in Ionic component.

We are doing it to remove the unnecessary attribute [_ngcontent-c1], It is a classed and automatically added by Angular. This stops us styling the ngx-datatable.

import { Component } from '@angular/core';
import { ViewEncapsulation } from '@angular/core';

@Component({
  selector: 'app-home',
  templateUrl: 'home.page.html',
  styleUrls: ['home.page.scss'],
  encapsulation: ViewEncapsulation.None
})

export class HomePage {

}

Now, you are completely ready to add the styling in ngx-datatable component.

Creating Data Table

Now, we will write the logic to fetch the external data using the Angular’s HttpClient Service and display that data inside the data tables using ngx-datatable component.

Open home.page.ts file and add the following code in it.

import { Component } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { ViewEncapsulation } from '@angular/core';

export interface Data {
  movies: string;
}

@Component({
  selector: 'app-home',
  templateUrl: 'home.page.html',
  styleUrls: ['home.page.scss'],
  encapsulation: ViewEncapsulation.None
})

export class HomePage {
  public data: Data;
  public columns: any;
  public rows: any;

  constructor(
    private http: HttpClient
  ) {
    this.columns = [
      { name: 'Name' },
      { name: 'Company' },
      { name: 'Genre' }
    ];

    this.http.get<Data>('../../assets/movies.json')
      .subscribe((res) => {
        console.log(res)
        this.rows = res.movies;
      });
  }
}

As far as the above code is concerned, we used a Data interface class to fetch the data using HttpClient’s GET method. It returns an observable which we subscribed to and assign it to rows in the Ionic view.

Add the following code in app/home.module.ts file.

<ion-header>
  <ion-toolbar>
    <ion-title>NGX Data Table</ion-title>
  </ion-toolbar>
</ion-header>

<ion-content>
  <div class="ion-padding">

    <!-- Theme classes dark, material, bootstrap -->
    <ngx-datatable 
      class="material"
      [limit]="8" 
      [rows]="rows" 
      [rowHeight]="50" 
      [columns]="columns"
      [columnMode]="'force'" 
      [sortType]="'multi'" 
      [headerHeight]="50" 
      [footerHeight]="50">
    </ngx-datatable>

  </div>
</ion-content>

To get the data in the data table, we used the following properties with the ngx-datatabel directive.
limit: Sets the number of items to display in the data table.
rows: Renders the data in the rows with the help of the component class.
rowHeight: Sets the height of the table rows.
columns: Renders the names of the columns from the component class property.
columnMode: Either flex or force – Force prop maintains the distance between columns.
sorttype: Sorts data on multiple columns.
headerHeight: Sets the height of the table header.
footerHeight: Sets the height of the table footer.

You can change the data table theme using one of the following class with ngx-datatable attribute.

  • material
  • dark
  • bootstrap

Conclusion

We have completed Ionic 4 Data Tables tutorials, In this tutorial we learned how to use ngx-datatable component to create the data tables, we also looked at how to fetch the data externally and display in the Ionic tables. Get the complete code of this tutorial on this GitHub repository.

How to Build Mobile Apps with Angular, Ionic 4, and Spring Boot

How to Build Mobile Apps with Angular, Ionic 4, and Spring Boot

Run Your Ionic App on Android. Make sure you're using Java 8. Run ionic cordova prepare android. Open platforms/android in Android Studio, upgrade Gradle if prompted. Set launchMode to singleTask in AndroidManifest.xml. Start your app using Android Studio...

In this brief tutorial, I’ll show you to use Ionic for JHipster v4 with Spring Boot and JHipster 6.

To complete this tutorial, you’ll need to have Java 8+, Node.js 10+, and Docker installed. You’ll also need to create an Okta developer account.

Create a Spring Boot + Angular App with JHipster

You can install JHipster via Homebrew (brew install jhipster) or with npm.

npm i -g [email protected]

Once you have JHipster installed, you have two choices. There’s the quick way to generate an app (which I recommend), and there’s the tedious way of picking all your options. I don’t care which one you use, but you must select OAuth 2.0 / OIDCauthentication to complete this tutorial successfully.

Here’s the easy way:

mkdir app && cd app

echo "application { config { baseName oauth2, authenticationType oauth2, \
  buildTool gradle, testFrameworks [protractor] }}" >> app.jh

jhipster import-jdl app.jh

The hard way is you run jhipster and answer a number of questions. There are so many choices when you run this option that you might question your sanity. At last count, I remember reading that JHipster allows 26K+ combinations!

The project generation process will take a couple of minutes to complete if you’re on fast internet and have a bad-ass laptop. When it’s finished, you should see output like the following.

OIDC with Keycloak and Spring Security

JHipster has several authentication options: JWT, OAuth 2.0 / OIDC, and UAA. With JWT (the default), you store the access token on the client (in local storage). This works but isn’t the most secure. UAA involves using your own OAuth 2.0 authorization server (powered by Spring Security), and OAuth 2.0 / OIDC allows you to use Keycloak or Okta.

Spring Security makes Keycloak and Okta integration so incredibly easy it’s silly. Keycloak and Okta are called "identity providers" and if you have a similar solution that is OIDC-compliant, I’m confident it’ll work with Spring Security and JHipster.

Having Keycloak set by default is nice because you can use it without having an internet connection.

To log into the JHipster app you just created, you’ll need to have Keycloak up and running. When you create a JHipster project with OIDC for authentication, it creates a Docker container definition that has the default users and roles. Start Keycloak using the following command.

docker-compose -f src/main/docker/keycloak.yml up -d

Start your application with ./gradlew (or ./mvnw if you chose Maven) and you should be able to log in using "admin/admin" for your credentials.

Open another terminal and prove all the end-to-end tests pass:

npm run e2e

If your environment is setup correctly, you’ll see output like the following:

> [email protected] e2e /Users/mraible/app
> protractor src/test/javascript/protractor.conf.js

[16:02:18] W/configParser - pattern ./e2e/entities/**/*.spec.ts did not match any files.
[16:02:18] I/launcher - Running 1 instances of WebDriver
[16:02:18] I/direct - Using ChromeDriver directly...


  account
    ✓ should fail to login with bad password
    ✓ should login successfully with admin account (1754ms)

  administration
    ✓ should load metrics
    ✓ should load health
    ✓ should load configuration
    ✓ should load audits
    ✓ should load logs


  7 passing (15s)

[16:02:36] I/launcher - 0 instance(s) of WebDriver still running
[16:02:36] I/launcher - chrome #01 passed
Execution time: 19 s.

OIDC with Okta and Spring Security

To switch to Okta, you’ll first need to create an OIDC app. If you don’t have an Okta Developer account, now is the time!

Log in to your Okta Developer account.

  • In the top menu, click on Applications
  • Click on Add Application
  • Select Web and click Next
  • Enter JHipster FTW! for the Name (this value doesn’t matter, so feel free to change it)
  • Change the Login redirect URI to be <a href="http://localhost:8080/login/oauth2/code/oidc" target="_blank">http://localhost:8080/login/oauth2/code/oidc</a>
  • Click Done, then Edit and add <a href="http://localhost:8080" target="_blank">http://localhost:8080</a> as a Logout redirect URI
  • Click Save

These are the steps you’ll need to complete for JHipster. Start your JHipster app using a command like the following:

SPRING_SECURITY_OAUTH2_CLIENT_PROVIDER_OIDC_ISSUER_URI=https://{yourOktaDomain}/oauth2/default \
  SPRING_SECURITY_OAUTH2_CLIENT_REGISTRATION_OIDC_CLIENT_ID=$clientId \
  SPRING_SECURITY_OAUTH2_CLIENT_REGISTRATION_OIDC_CLIENT_SECRET=$clientSecret ./gradlew

Create a Native App for Ionic

You’ll also need to create a Native app for Ionic. The reason for this is because Ionic for JHipster is configured to use PKCE(Proof Key for Code Exchange). The current Spring Security OIDC support in JHipster still requires a client secret. PKCE does not.

Go back to the Okta developer console and follow the steps below:

  • In the top menu, click on Applications
  • Click on Add Application
  • Select Native and click Next
  • Enter Ionic FTW! for the Name
  • Add Login redirect URIs: <a href="http://localhost:8100/implicit/callback" target="_blank">http://localhost:8100/implicit/callback</a> and dev.localhost.ionic:/callback
  • Click Done, then Edit and add Logout redirect URIs: <a href="http://localhost:8100/implicit/logout" target="_blank">http://localhost:8100/implicit/logout</a> and dev.localhost.ionic:/logout
  • Click Save

You’ll need the client ID from your Native app, so keep your browser tab open or copy/paste it somewhere.

Create Groups and Add Them as Claims to the ID Token

In order to login to your JHipster app, you’ll need to adjust your Okta authorization server to include a groups claim.

On Okta, navigate to Users > Groups. Create ROLE_ADMIN and ROLE_USER groups and add your account to them.

Navigate to API > Authorization Servers, click the Authorization Servers tab and edit the default one. Click the Claims tab and Add Claim. Name it "groups" or "roles" and include it in the ID Token. Set the value type to "Groups" and set the filter to be a Regex of .*. Click Create.

Navigate to <a href="http://localhost:8080" target="_blank">http://localhost:8080</a>, click sign in and you’ll be redirected to Okta to log in.

Enter the credentials you used to signup for your account, and you should be redirected back to your JHipster app.

Generate Entities for a Photo Gallery

Let’s enhance this example a bit and create a photo gallery that you can upload pictures to. Kinda like Flickr, but waaayyyy more primitive.

JHipster has a JDL (JHipster Domain Language) feature that allows you to model the data in your app, and generate entities from it. You can use its JDL Studio feature to do this online and save it locally once you’ve finished.

I created a data model for this app that has an Album, Photo, and Tag entities and set up relationships between them. Below is a screenshot of what it looks like in JDL Studio.

Copy the JDL below and save it in a photos.jdl file in the root directory of your project.

entity Album {
  title String required,
  description TextBlob,
  created Instant
}

entity Photo {
  title String required,
  description TextBlob,
  image ImageBlob required,
  taken Instant
}

entity Tag {
  name String required minlength(2)
}

relationship ManyToOne {
  Album{user(login)} to User,
  Photo{album(title)} to Album
}

relationship ManyToMany {
  Photo{tag(name)} to Tag{photo}
}

paginate Album with pagination
paginate Photo, Tag with infinite-scroll

You can generate entities and CRUD code (Java for Spring Boot; TypeScript and HTML for Angular) using the following command:

jhipster import-jdl photos.jdl

When prompted, type a to update existing files.

This process will create Liquibase changelog files (to create your database tables), entities, repositories, Spring MVC controllers, and all the Angular code that’s necessary to create, read, update, and delete your data objects. It’ll even generate Jest unit tests and Protractor end-to-end tests!

When the process completes, restart your app, and confirm that all your entities exist (and work) under the Entities menu.

You might notice that the entity list screen is pre-loaded with data. This is done by faker.js. To turn it off, edit src/main/resources/config/application-dev.yml, search for liquibase and set its contexts value to dev. I made this change in this example’s code and ran ./gradlew clean to clear the database.

liquibase:
  # Add 'faker' if you want the sample data to be loaded automatically
  contexts: dev

Develop a Mobile App with Ionic and Angular

Getting started with Ionic for JHipster is similar to JHipster. You simply have to install the Ionic CLI, Yeoman, the module itself, and run a command to create the app.

npm i -g [email protected] [email protected] yo
yo jhipster-ionic

If you have your app application at ~/app, you should run this command from your home directory (~). Ionic for JHipster will prompt you for the location of your backend application. Use mobile for your app’s name and app for the JHipster app’s location.

Type a when prompted to overwrite mobile/src/app/app.component.ts.

Open mobile/src/app/auth/auth.service.ts in an editor, search for data.clientId and replace it with the client ID from your Native app on Okta.

// try to get the oauth settings from the server
this.requestor.xhr({method: 'GET', url: AUTH_CONFIG_URI}).then(async (data: any) => {
  this.authConfig = {
    identity_client: '{yourClientId}',
    identity_server: data.issuer,
    redirect_url: redirectUri,
    end_session_redirect_url: logoutRedirectUri,
    scopes,
    usePkce: true
  };
  ...
}

When using Keycloak, this change is not necessary.### Add Claims to Access Token

In order to authentication successfully with your Ionic app, you have to do a bit more configuration in Okta. Since the Ionic client will only send an access token to JHipster, you need to 1) add a groups claim to the access token and 2) add a couple more claims so the user’s name will be available in JHipster.

Navigate to API > Authorization Servers, click the Authorization Servers tab and edit the default one. Click the Claims tab and Add Claim. Name it "groups" and include it in the Access Token. Set the value type to "Groups" and set the filter to be a Regex of .*. Click Create.

Add another claim, name it given_name, include it in the access token, use Expression in the value type, and set the value to user.firstName. Optionally, include it in the profile scope. Perform the same actions to create a family_name claim and use expression user.lastName.

When you are finished, your claims should look as follows.

Run the following commands to start your Ionic app.

cd mobile
ionic serve

You’ll see a screen with a sign-in button. Click on it, and you’ll be redirected to Okta to authenticate.

Now that you having log in working, you can use the entity generator to generate Ionic pages for your data model. Run the following commands (in your ~/mobile directory) to generate screens for your entities.

yo jhipster-ionic:entity album

When prompted to generate this entity from an existing one, type Y. Enter ../app as the path to your existing application. When prompted to regenerate entities and overwrite files, type Y. Enter a when asked about conflicting files.

Go back to your browser where your Ionic app is running (or restart it if you stopped it). Click on Entities on the bottom, then Albums. Click the blue + icon in the bottom corner, and add a new album.

Click the ✔️ in the top right corner to save your album. You’ll see a success message and it listed on the next screen.

Refresh your JHipster app’s album list and you’ll see it there too!

Generate code for the other entities using the following commands and the same answers as above.

yo jhipster-ionic:entity photo
yo jhipster-ionic:entity tag

Run Your Ionic App on iOS

To generate an iOS project for your Ionic application, run the following command:

ionic cordova prepare ios

When prompted to install the ios platform, type Y. When the process completes, open your project in Xcode:

open platforms/ios/MyApp.xcworkspace

You’ll need to configure code signing in the General tab, then you should be able to run your app in Simulator.

Log in to your Ionic app, tap Entities and view the list of photos.

Add a photo in the JHipster app at <a href="http://localhost:8080" target="_blank">http://localhost:8080</a>.

To see this new album in your Ionic app, pull down with your mouse to simulate the pull-to-refresh gesture on a phone. Looky there - it works!

There are some gestures you should know about on this screen. Clicking on the row will take you to a view screen where you can see the photo’s details. You can also swipe left to expose edit and delete buttons.

Run Your Ionic App on Android

Deploying your app on Android is very similar to iOS. In short:

  1. Make sure you’re using Java 8
  2. Run ionic cordova prepare android
  3. Open platforms/android in Android Studio, upgrade Gradle if prompted
  4. Set launchMode to singleTask in AndroidManifest.xml
  5. Start your app using Android Studio
  6. While your app is starting, run adb reverse tcp:8080 tcp:8080 so the emulator can talk to JHipster
Learn More About Ionic 4 and JHipster 6

Ionic is a nice way to leverage your web development skills to build mobile apps. You can do most of your development in the browser, and deploy to your device when you’re ready to test it. You can also just deploy your app as a PWA and not both to deploy it to an app store.

JHipster supports PWAs too, but I think Ionic apps look like native apps, which is a nice effect. There’s a lot more I could cover about JHipster and Ionic, but this should be enough to get you started.

You can find the source code for the application developed in this post on GitHub at @oktadeveloper/okta-ionic4-jhipster-example.

Thank you for reading!

Angular with ionic 4 required

Please provide me angular and ionic 4 tutorials with some examples.

Please provide me angular and ionic 4 tutorials with some examples.


Thank you.

Ionic 4/Angular Modals - Tutorial

Ionic 4/Angular Modals - Tutorial

In this tutorial, we are going to see how to use modals in Ionic 4/Angular apps by creating a simple demo app so let's get started!

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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