CODEWITHSUNDEEP
angulartypescript
Md. Parvez Alam
Md. Parvez Alam

Reputation: 4596

Add items in array angular 4

I have following code 

export class FormComponent implements OnInit {
  name: string;
  empoloyeeID : number;
  empList: Array<{name: string, empoloyeeID: number}> = []; 
  constructor() {
  }

ngOnInit() {
  }

onEmpCreate(){
   console.log(this.name,this.empoloyeeID);
   this.empList.push.apply(this.name,this.empoloyeeID);
   this.name ="";
   this.empoloyeeID = 0;
   }
}

but this throwing error

CreateListFromArrayLike called on non-object

Also is there any way to create a custom class and used object list rather than defining array over here.

Thanks

Upvotes: 28

Views: 339656

Answers (3)

Srinivas Valekar
Srinivas Valekar

Reputation: 1123

Yes there is a way to do it.

First declare a class.

//anyfile.ts
export class Custom
{
  name: string, 
  empoloyeeID: number
}

Then in your component import the class

import {Custom} from '../path/to/anyfile.ts'
.....
export class FormComponent implements OnInit {
 name: string;
 empoloyeeID : number;
 empList: Array<Custom> = [];
 constructor() {

 }

 ngOnInit() {
 }
 onEmpCreate(){
   //console.log(this.name,this.empoloyeeID);
   let customObj = new Custom();
   customObj.name = "something";
   customObj.employeeId = 12; 
   this.empList.push(customObj);
   this.name ="";
   this.empoloyeeID = 0; 
 }
}

Another way would be to interfaces read the documentation once - https://www.typescriptlang.org/docs/handbook/interfaces.html

Also checkout this question, it is very interesting - When to use Interface and Model in TypeScript / Angular2

Upvotes: 59

Faly
Faly

Reputation: 13356

Push object into your array. Try this:

export class FormComponent implements OnInit {
    name: string;
    empoloyeeID : number;
    empList: Array<{name: string, empoloyeeID: number}> = []; 
    constructor() {}
    ngOnInit() {}
    onEmpCreate(){
        console.log(this.name,this.empoloyeeID);
        this.empList.push({ name: this.name, empoloyeeID: this.empoloyeeID });
        this.name = "";
        this.empoloyeeID = 0;
    }
}

Upvotes: 6

Saurabh Agrawal
Saurabh Agrawal

Reputation: 7749

Your empList is object type but you are trying to push strings

Try this

this.empList.push({this.name,this.empoloyeeID});

Upvotes: 16

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