Embed the value of an array in HTML

Upon running console.log, the data output appears as follows:

{TotalPendingResponseCount: 0, TotalRequestSendCount: 1, TotalRequestReceivedCount: 1, TotalRequestRejectCount: 3}

To store this information, I am holding it in an array:

userData : arrayResponseCount[];
To retrieve the result:
this.dataservice.getData(Url).
    subscribe((res: any) => 
    { this.userData = res });
  }

The structure of my arrayResponseCount class is:

class arrayResponseCount {
  constructor(public TotalRequestSendCount: string, public TotalPendingResponseCount: string,
              public TotalRequestRejectCount: string, public TotalRequestReceivedCount: string
  ){}
}

Now, for binding the value in HTML, I am using the syntax:

{{userData.TotalRequestSendCount}}

However, this results in an exception being thrown: ERROR TypeError: Cannot read property 'TotalRequestSendCount' of undefined.

Any insights on how to address this issue?

Answer №1

When retrieving data from an asynchronous request, there may be a delay that can be managed using the safe navigation operator ?,

{{userData?.TotalRequestSendCount}}

Answer №2

At the initial assessment by Angular, the binding

{{userData.TotalRequestSendCount}}
does not possess a value for userData.

Instead, utilize

{{userData?.TotalRequestSendCount}}

to signal to Angular that it should refrain from attempting to access TotalRequestSendCount while userData remains null (referred to as the safe-navigation operator).

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