In Ionic 2 (and later versions), you can easily extract and reuse the navigation bar (navbar) template and logic by creating a custom component for the navbar. By doing so, you can use this custom component throughout your app, ensuring consistent styling and behavior for the navigation bar.

Here's how you can extract and reuse the navbar template and logic in an Ionic 2 app:

  1. Create a Custom Navbar Component:

    • Run the following command in your Ionic 2 project's root folder to generate a new component:
    bash
    ionic generate component custom-navbar

    This will create a new folder named custom-navbar inside the components directory with the necessary files for the component.

    • Open the newly created custom-navbar.component.ts file (located inside the components/custom-navbar folder) and define the logic for the navbar. For example:
    typescript
    import { Component } from '@angular/core'; @Component({ selector: 'app-custom-navbar', templateUrl: 'custom-navbar.component.html', styleUrls: ['custom-navbar.component.scss'] }) export class CustomNavbarComponent { // Add any logic or properties specific to the navbar }
    • Open the custom-navbar.component.html file (located inside the components/custom-navbar folder) and define the HTML template for the navbar:
    html
    <ion-header> <ion-navbar> <ion-title>{{ title }}</ion-title> </ion-navbar> </ion-header>
  2. Use the Custom Navbar Component in Pages:

    • To use the custom navbar component in a specific page, you need to import the component and add it to the page's template.

    • Open the page's .module.ts file (e.g., home.module.ts) and import the CustomNavbarComponent:

    typescript
    import { NgModule } from '@angular/core'; import { IonicPageModule } from 'ionic-angular'; import { HomePage } from './home'; import { CustomNavbarComponent } from '../../components/custom-navbar/custom-navbar.component'; @NgModule({ declarations: [HomePage, CustomNavbarComponent], imports: [IonicPageModule.forChild(HomePage)] }) export class HomePageModule {}
    • In the page's HTML template (e.g., home.html), add the custom navbar component:
    html
    <ion-content> <app-custom-navbar title="Home"></app-custom-navbar> <!-- Add the page content here --> </ion-content>
  3. Pass Data to the Custom Navbar Component:

    • You can pass data, such as the title of the page, to the custom navbar component using input properties.

    • In the custom-navbar.component.ts, define an input property to receive the title:

    typescript
    import { Component, Input } from '@angular/core'; @Component({ selector: 'app-custom-navbar', templateUrl: 'custom-navbar.component.html', styleUrls: ['custom-navbar.component.scss'] }) export class CustomNavbarComponent { @Input() title: string; }
    • Now, when using the custom navbar component in the page's HTML template, you can pass the title as an attribute:
    html
    <ion-content> <app-custom-navbar title="Home"></app-custom-navbar> <!-- Add the page content here --> </ion-content>

By following these steps, you've successfully extracted the navbar template and logic into a reusable custom component. Now, you can use this custom component in any page of your Ionic 2 app to ensure consistency and easily make changes across all instances of the navbar.

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