How to return employeecode on angular employees component.html?

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Problem

How to return EmployeeCode on angular employees component.html ?

CSS

Sample data ReferenceTable

Code  tableName   FieldName   LabelText
111   Employees   EmployeeId  EmployeeCode
Result of calling

GetLabelTextForEmployee('Employees','EmployeeId')

it suppose Return EmployeeCode

I work on asp.net core 2.1 web API with angular 6.

I make function on web API name GetReferenceFileData to get text of label from

database and show on view on employees.component.html based on Reference Table .

This is my function :

C#

[HttpGet("{tableName}/{FieldName}")]
        [Produces("text/plain")]
        public string GetReferenceFileData([FromRoute] string tableName, [FromRoute] string FieldName)
        {
          var Result =  (from h in _context.ReferenceFiles
                          where h.TableName == tableName && h.FieldName == FieldName
                          select h.LabelText).FirstOrDefault();
            if(Result==null)
            {
                Result = "Not Exist";
            }

            return (Result);


        }

Function above return only one string value for label as Scalar Value

on employee.component.html
// how to use function GetLabelTextForEmployee here to return EmployeeCode

What I have tried:

1- on API service on angular I create Function Below :

public GetLabelTextForEmployee(tableName:string,FieldName:string): Observable<any> {
        return this.http
            .get('https://localhost:44326/api/reference/' + tableName + '/' + FieldName, {
                responseType: 'text',
            });
    }

Posted 23-Feb-19 21:42pm

ahmed_sa

Updated 27-Feb-19 22:59pm

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StijnBollen · Answer 1 · 2019-02-27T22:59:00

In your employees.component.ts file you import OnInit and OnDestoy and implement them.
On your class, you'll need a employeeCode string-property to store the value.
In ngOnInit you need to subscribe to the ApiService's GetLabelText with the needed parameters and in ngOnDestroy you'll need to unsubscribe.

JavaScript

import { OnInit, OnDestroy } from '@angular/core';
import { Subscription } from 'rxjs';

import { ApiService } from '../../services/api.service';

@component({
  selector: '[app-employees]'
  templateUrl: './employees.component.html',
})
export class EmployeesComponent implements OnInit, OnDestroy {

  public labelSubscription: Subscription;
  public employeeCode: string;

  public constructor(private apiService: ApiService) { }

  public ngOnInit() {
    this.labelSubscription =
      ApiService.GetLabelText('Employee', 'EmployeeId')
                .subscribe((value) => this.employeeCode = value);
  }

  public ngOnDestroy() {
    if (this.labelSubscription) {
      this.labelSubscription.unsubscribe();
      this.labelSubscription = null;
    }
  }
}

I also suggest you take a look at Angular documentation and do a run on the Heroes tutorial.