The issue arising from utilizing the export class function in Angular 8

Hey there! I'm working on an Angular application and just getting started with it. My current version is Angular 8, and I've encountered an issue that I need help with.

In my project, I have a shared model named "Client" which is defined in a file called client.model.ts located in the src/app/shared folder. Here's a snippet of the code:


export class Client {
    ClientID: number;
    ClientName: string;
}

The problem arises when trying to reference this Client class in my client.component.ts file situated in the src/app/client folder.

Here's the specific code snippet causing errors:


public client_: Client;

loadData() {
    this.service.getClient().subscribe(result => {
        this.client_ = result;
        console.table(result);
    }, error => console.error(error));
}

url = '';
onSelectFile(event) {
    if (event.target.files && event.target.files[0]) {
        var reader = new FileReader();

        reader.readAsDataURL(event.target.files[0]);

        reader.onload = (event) => {
            this.url = event.target.result;
        }
    }
}

The error message states:


ERROR in src/app/client/client.component.ts:73:7 - error TS2696: The 'Object' type is assignable to very few other types. Did you mean to use the 'any' type instead?
Type 'Object' is missing the following properties from type 'Client': ClientID, ClientName, Acronym, ContactPerson1, and more.

src/app/client/client.component.ts:132:33 - error TS2339: Property 'result' does not exist on type 'EventTarget'.

Below are the full contents of the two files involved:

For Client.Model.ts file:


export class Client {
    // Properties here...
}

For Client.Component.ts file:


import { Component, OnInit, ViewChild, TemplateRef } from '@angular/core';
// Other imports...

@Component({
    selector: 'app-client',
    templateUrl: './client.component.html',
})

export class ClientComponent implements OnInit {
    // Various methods and functions defined here...
}

Answer №1

When working with Typescript, it is important to be mindful of the data types you are using to avoid errors like the one you encountered.

The 'Object' type has limited assignability to other types. Consider using the 'any' type instead if needed.
  Type 'Object' lacks properties such as ClientID, ClientName, Acronym, ContactPerson1, and more as expected by type 'Client'.

Angular throws an error because you have declared a variable public client_: Client;, but it does not contain the required data structure of the Client type.

Your populate function should look something like this:

 populate(clientData: Client) {
       // Avoid using Object.assign(...). clientData already matches the Client type
    this.service.formData = clientData;
  }

As for the loadData function, make sure to include a type in the result variable like so:

loadData() {
    this.service.getClient().subscribe(result: Client => {
      this.client_ = result;
      console.table(result);
    }, error => console.error(error));
  }

Ensure that your getClient method in ClientService returns data of type Client:

getClient():Client {
....
}

I hope these changes help resolve the issue you are facing.

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