angular

Today lets learn how to make use of ngClass angular directive in our Ionic 2 application.

Related Read:
ngIf, index, first, last: Ionic 2

ngClass Directive: Ionic 2

[youtube https://www.youtube.com/watch?v=r1ZRoXBcUfs]

YouTube Link: https://www.youtube.com/watch?v=r1ZRoXBcUfs [Watch the Video In Full Screen.]

Company Names: src/pages/home/home.ts

import { Component } from '@angular/core';
 
@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {
items: any = [];
  constructor() {
    this.items = [
      'Microsoft',
      'Apple',
      'Oracle',
      'Google',
      'IBM',
      'Tesla',
      'Technotip'
    ];
  }
}

We have an array of company names which is being assigned to variable items.

Output
Microsoft
Apple
Oracle
Google
IBM
Tesla
Technotip

CSS Class: src/pages/home/home.scss

page-home {
    .bold{
        font-weight: bolder;
    }
    .normal{
        font-weight: normal;
    }
}

We define two CSS classes which we use to apply for alternate list items – using ngClass directive. Alternatively the list items appear in bold and in normal font weight.

ngClass Directive – using ternary operator: src/pages/home/home.html

< ion-header>
  < ion-navbar>
    < ion-title>
      Company Names
    < /ion-title>
  < /ion-navbar>
< /ion-header>
 
< ion-content padding>
< ion-list no-lines>
  < ion-item *ngFor="let item of items; let i = index;"
             [ngClass]="(i % 2 == 0) ? 'bold' : 'normal'">
    {{i+1}}. {{item}}
  < /ion-item>
< /ion-list>
< /ion-content>

Here we use ternary operator and whenever i % 2 is zero we apply bold class to that item, if not we apply normal class to that list item.

ngClass Directive: src/pages/home/home.html

< ion-header>
  < ion-navbar>
    < ion-title>
      Company Names
    < /ion-title>
  < /ion-navbar>
< /ion-header>
 
< ion-content padding>
< ion-list no-lines>
  < ion-item *ngFor="let item of items; let i = index;"
             [ngClass]="{'bold': (i % 2 == 0)}">
    {{i+1}}. {{item}}
  < /ion-item>
< /ion-list>
< /ion-content>

This is yet another way of doing the same thing which we did using ternary operator above. Here, if i % 2 is equal to zero, then bold class will be applied, if not it won’t be applied.

changing colors: src/pages/home/home.scss

page-home {
    .bold{
        font-weight: bolder;
        color: blue;
    }
    .normal{
        font-weight: normal;
        color: green;
    }
}

Alternatively the list items appear in bold and in normal font weight, along with blue and green colors respectively.

Ionic apps are developed with angular code, so people start using ng-href to point to URLs which has {{}} variables whose value will be dynamically loaded. With ng-href IONIC treats the links like internal links and hence opens them within the application itself. To solve this, we make use of onclick and window.open() methods.

Note: Am using Windows 7 to illustrate this tutorial.

ionic

In this tutorial I’ll show you the exact code you need to do this effectively: To open the external URL in mobiles browser.

Step 1: You need node.js installed on your computer.
Step 2: Install cordova and ionic

npm install ionic -g

npm install cordova -g

Step 3: Install inappbrowser plugin

cordova plugin add https://git-wip-us.apache.org/repos/asf/cordova-plugin-inappbrowser.git

cordova plugin add org.apache.cordova.inappbrowser

Step 4: Insert the code in your view (html files)

<a class="button button-assertive" 
   ng-href="http:// url .com/{{id}}/discount"
   onclick='window.open(this.href, "_system", "location=yes"); return false;'>
</a>

This way, the variables in the ng-href interpolates and then is being inserted as first parameter to window.open() method.

IONIC APP – Open External Links In Mobile Browser

[youtube https://www.youtube.com/watch?v=tqbmsOn_n1E]

YouTube Link: https://www.youtube.com/watch?v=tqbmsOn_n1E [Watch the Video In Full Screen.]

Loads in the system browser: window.open(‘http://example.com’, ‘_system’);
Loads in the InAppBrowser: window.open(‘http://example.com’, ‘_blank’);
Loads in the InAppBrowser with no location bar: window.open(‘http://example.com’, ‘_blank’, ‘location=no’);
Loads in the Cordova web view: window.open(‘http://example.com’, ‘_self’);