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QuestionCalling Web api from Angular Service and Component Pin
simpledeveloper29-Jan-19 7:07
Membersimpledeveloper29-Jan-19 7:07 

I have a Web Api as below:
public class PeakTimeRebateController : Controller
    public IActionResult GetTransactionStatus(string EncryptedAccountNumber)
        this.Response.ContentType = "text/html";
        int randVal = new Random().Next(0, 10);

        if ((randVal == 1) || (randVal == 2) || (randVal == 3) || (randVal == 5) || (randVal == 7))
            return new ObjectResult("Prime");
        if (randVal % 2 == 0)
            return new ObjectResult("Even");
            return new ObjectResult("Odd");

I am calling this from a Angular Service as below:
export class PeakTimeRebatesService extends ServiceBase {
    private _peaktimerebateTransactionStatusUrl: string = '/api/PeakTimeRebate/GetTransactionStatus';

    constructor(public _http: PgeCustomHttp) {

    public peakTimeRebateTransactionStatus(encryptedAccountNumber: string): Observable<string> {
        const params: URLSearchParams = new URLSearchParams(); //'EncryptedAccountNumber', new PgeCustomQueryEncoder()
        params.set('EncryptedAccountNumber', encryptedAccountNumber);

        const options = new RequestOptions({ search: params });

        return this._http.get(this._peaktimerebateTransactionStatusUrl, options)

I already have imported necessary components for the Service that I haven't mentioned here.

Now I have a component as below:
import { PeakTimeRebatesService } from '../peakTimeRebates/peakTimeRebates.service'; //Importing my Service

    selector: 'transactionSuccessful-message',
    templateUrl: 'transactionSuccessful.component.html'

export class TransactionSuccessfulComponent extends ComponentBase {
    public TransactionMessage: string = '';
    public TransactionSuccessStatus = false;
    public TransactionExceptionStatus = false;
    private max: number = 10; private min: number = 0; private randVal: number; private checkStatMessage: string;

    public get EncryptedAccountNumber() {
        return this._encryptedAccountNumber;

    public set EncryptedAccountNumber(value: string) {
        if ((value == null) || (value == '')) {
            value = 'XYZ'
        this._encryptedAccountNumber = value;
        if (this.EncryptedAccountNumber !== '') {

    private _encryptedAccountNumber: string = '';

    public constructor(
        private _service: PeakTimeRebatesService       
    ) {        

    private peakTimeRebateTransactionStatus(encryptedAccountNumber: string): void {
        this._service.peakTimeRebateTransactionStatus(encryptedAccountNumber).subscribe((peakTimeRebateTransactionStatus: any) => {
            this.TransactionMessage = peakTimeRebateTransactionStatus;           

    ngOnInit(): void {
        this.EncryptedAccountNumber = '';      
        if (this.TransactionMessage == "Prime")
            this.TransactionSuccessStatus = true;
        else if (this.TransactionMessage == "Even")
            this.TransactionSuccessStatus = false;
            this.TransactionExceptionStatus = true;

And finally my html component is:
<div class="layout-two-column">
    <section class="layout-primary">
        <form #payBillSuccessForm="ngForm" id="payBillSuccessForm" name="payBillSuccessForm" novalidate>

            <div *ngIf="TransactionSuccessStatus">
                <h2 id="transactionSucessfulText">{{ 'Common.EnrollmentSuccessful' | Translate }}</h2>

            <div *ngIf="!TransactionSuccessStatus">
                <h2 id="transactionFailedText">{{ 'PeakTimeRebatesView.EnrollmentSuccessMessage' | Translate }}</h2>

            <div *ngIf="TransactionExceptionStatus">
                <h2 id="transactionExceptionText">{{ 'PeakTimeRebatesView.PeakTimeRebatesHeader' | Translate }}</h2>

            <div class="divider-invisible text-right">
                <a class="btn" routerLink="/AccountInformation" id="doneButton">{{ 'Common.Done' | Translate }}</a>
<browser-back [lastpage]="true"></browser-back>

Now I am expecting that I want to show the message depending upon the returned value from web api, (the problem is that, the execution of the ngOnInit is finishing before execution of Web Api, I mean the setting of TransactionMessage is happening before the Web Api returns value, I am not sure why is it happening, I am new to the client side programming World) I found it when I put the break point, from onInit method before Service call is being completed the control is coming back and finishing the onInit then finishing the web api call, trying to understand how to call the web api from the angular controller, is the onInit not a right place to call the web api from the Angular Component. Any suggestions where am I making mistake? Any help would be very very helpful, thanks in advance. I am new to Angular, really need some help - please, thank you.

modified 29-Jan-19 16:17pm.

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