6. A. Passing data from Container Component to Child Component

 AIM: Create an AppComponent that displays a dropdown with a list of courses as values in it. Create another component called the CoursesList component and load it in AppComponent which should display the course details. When the user selects a course from the list, the details should be updated.


Program: 

Step 1: Create a Course model

src/app/course.model.ts

*******************

export interface Course {

  id: number;

  name: string;

  description: string;

  duration: string;

}

********************


 Step 2: AppComponent

src/app/app.component.ts


********

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

import { Course } from './course.model';


@Component({

  selector: 'app-root',

  templateUrl: './app.component.html',

  styleUrls: ['./app.component.css']

})

export class AppComponent {

  courses: Course[] = [

    { id: 1, name: 'Angular Basics', description: 'Learn Angular fundamentals', duration: '4 weeks' },

    { id: 2, name: 'React Fundamentals', description: 'Introduction to React library', duration: '3 weeks' },

    { id: 3, name: 'Node.js Essentials', description: 'Server-side programming with Node.js', duration: '5 weeks' }

  ];


  selectedCourseId: number | null = null;

  selectedCourse?: Course;


  onCourseSelect(courseId: number) {

    this.selectedCourse = this.courses.find(c => c.id === Number(courseId));

  }

}

*************

src/app/app.component.html

************
<h1>Course Selection</h1>

<!-- Dropdown with ngModel -->
<select [(ngModel)]="selectedCourseId" (ngModelChange)="onCourseSelect($event)">
  <option value="">-- Select a Course --</option>
  <option *ngFor="let course of courses" [value]="course.id">
    {{ course.name }}
  </option>
</select>

<!-- Pass selected course to child -->
<app-courses-list [course]="selectedCourse"></app-courses-list>

**************

generate courses-list component

ng generate component courses-list

src/app/courses-list/courses-list.component.ts    code

***************
import { Component, Input } from '@angular/core';
import { Course } from '../course.model';

@Component({
  selector: 'app-courses-list',
  templateUrl: './courses-list.component.html',
  styleUrls: ['./courses-list.component.css']
})
export class CoursesListComponent {
  @Input() course?: Course;
}
********************

src/app/courses-list/courses-list.component.html

*******************


<div *ngIf="course; else noCourse">
  <h2>{{ course.name }}</h2>
  <p><strong>Description:</strong> {{ course.description }}</p>
  <p><strong>Duration:</strong> {{ course.duration }}</p>
</div>

<ng-template #noCourse>
  <p>Please select a course to see details.</p>
</ng-template>


***********

Add the following code to app.module.ts file in app folder to import forms module

import { FormsModule } from '@angular/forms';

imports: [

    BrowserModule,

    AppRoutingModule,

FormsModule

  ],

***************


Run App:

ng serve

6.B Passing data from Child Component to ContainerComponent

AIM: Create an AppComponent that loads another component called the CoursesList component. Create another component called CoursesListComponent which should display the courses list in a table along with a register .button in each row. When a user clicks on the register button it should say you are registered for this course

PROGRAM: 

create new App by

ng new c2p

create a component courses-list

PRACTICE
ng generate component courses-list


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