Error Alert: missing property data in angular 5 type

Question

Error Alert: missing property data in angular 5 type

I attempted to design an interface in interface.ts. The data consists of an array of objects inside the Column. Below is the code for my interface:

export class User {
result: boolean;
messages: string;
Column=[];
data=[];
}
export class Column {  
name:string;
category:boolean;
count:number;
}

export class data {
name:string;
category:string;
}

The following code is used in the service.

getData(): Promise<User> {
return Promise.resolve(
{ result: true, messages: 'Maria','Column':[{
name:'ramu',category:'c',count:4, "data":[{"name":"",      "category:""
    }]
}]
}
);
}

However, I encountered a type error. I have attached a screenshot below for your reference. Please check and see the error screenshot. Code URL Stackblitz

https://i.stack.imgur.com/KASbQ.png

angular typescript

Answer 1

Answer №1

Give it a shot

  fetchData(): Promise<Person> {
return Promise.resolve(
{ success: true, note: 'Maria',
  'Columns':[{   person:'John',gender:'male',age:30}], 
 "details":[{ "name":"", "occupation":"" }]
});
}

Answer 2

Give it a shot

  fetchData(): Promise<Person> {
return Promise.resolve(
{ success: true, note: 'Maria',
  'Columns':[{   person:'John',gender:'male',age:30}], 
 "details":[{ "name":"", "occupation":"" }]
});
}

Answer 3

Answer №2

Check out the code snippet below.

import { Injectable } from '@angular/core';
import { Http, Headers, Response, URLSearchParams, RequestOptions } from '@angular/http';
import { Router } from '@angular/router';
import { Observable } from 'rxjs/Observable';
import { User } from './interface';
import { Column } from './interface';

import 'rxjs/add/operator/map';

@Injectable()
export class DataService {

  userCookie: any;
  loginAlertMessage: string;
  constructor(private http: Http
  ) {
  }

  getData(): Promise<User> {
    return Promise.resolve(
      {
        result: true, messages: 'Maria',
        'Column': [{ name: 'ramu', category: 'c', count: 4 }],
        "data": [{ "name": "", "category": "" }]
      });
  }
}

DEMO

Answer 4

Check out the code snippet below.

import { Injectable } from '@angular/core';
import { Http, Headers, Response, URLSearchParams, RequestOptions } from '@angular/http';
import { Router } from '@angular/router';
import { Observable } from 'rxjs/Observable';
import { User } from './interface';
import { Column } from './interface';

import 'rxjs/add/operator/map';

@Injectable()
export class DataService {

  userCookie: any;
  loginAlertMessage: string;
  constructor(private http: Http
  ) {
  }

  getData(): Promise<User> {
    return Promise.resolve(
      {
        result: true, messages: 'Maria',
        'Column': [{ name: 'ramu', category: 'c', count: 4 }],
        "data": [{ "name": "", "category": "" }]
      });
  }
}

DEMO

Answer 5

Answer №3

Explore the interface.ts

export class User {
  isValid: boolean;
  feedback: string;
  Column=[];
}
export class Column {  
  title:string;
  isCategory:boolean;
  total:number;
  rows=[]; 
}
export class RowData {
  title:string;
  category:string;
}

Data Service Operation

getData(): Promise<User> {
    return Promise.resolve(this.data);
}

DEMO IN ACTION

Answer 6

Explore the interface.ts

export class User {
  isValid: boolean;
  feedback: string;
  Column=[];
}
export class Column {  
  title:string;
  isCategory:boolean;
  total:number;
  rows=[]; 
}
export class RowData {
  title:string;
  category:string;
}

Data Service Operation

getData(): Promise<User> {
    return Promise.resolve(this.data);
}

DEMO IN ACTION

Answer 7

Answer №4

Some may argue that the suggestions offered by other responses are valid.

However, in my personal view, it is recommended to utilize "type assertion" to specify the object as the Type you need (assuming the data aligns with the required format)...

getData(): Promise<User> {
    return Promise.resolve(
      {
        result: true, messages: 'Maria',
        'Column': [{ name: 'ramu', category: 'c', count: 4 }],
        "data": [{ "name": "", "category": "" }]
      } as User);
  }

In essence, append as User at the end of the object.

Answer 8

Some may argue that the suggestions offered by other responses are valid.

However, in my personal view, it is recommended to utilize "type assertion" to specify the object as the Type you need (assuming the data aligns with the required format)...

getData(): Promise<User> {
    return Promise.resolve(
      {
        result: true, messages: 'Maria',
        'Column': [{ name: 'ramu', category: 'c', count: 4 }],
        "data": [{ "name": "", "category": "" }]
      } as User);
  }

In essence, append as User at the end of the object.

Error Alert: missing property data in angular 5 type

Answer №1

Answer №2

Answer №3

Answer №4

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