Angular 5 data passing

Question

Hi, My doubts 1) Can I use input and output decorator for components which doesnot have parent child relationship? 2) For services- is it compulsory to have parent child relationship for components? 3) Can I get exmaples for service ?

Mahesh Verma · Answer

Hi Nithi, 1. You cannot use input and output decorator for components which doesn't have parent child releationship. 2. You can use services any where, either its show any relationship (parent-child) or not. 3. Service Example : //created service and inside it write a method "getStudentList()" which fetches data from server side. @Injectable() export class StudentService { studentList: Student[]; constructor( private _httpClient: HttpClient) { } getStudentList(classId: any): Observable { return this ._httpClient.get ( 'http://localhost:4200/getStudentRecord' + classId).pipe( tap(data=>{ this .studentList=data }) ) } } Consume service in component file //first inject your service name in provider property inside component decorator function @Component(){}; //create an instance of that service inside the constructor constructor( private student: StudentService) { this .getStudentList(); } this .studentList =[]; getStudentList() { this .student.getStudentList(10) //on the basis of instance call service method .subscribe(res => this .SuccessGet(res), res => this .ErrorGet(res)); } SuccessGet(data: any) { this .studentList = data; } ErrorGet(data: any) { console.log( "Error" ); } I hope it will help you.