I am making angular application and where i am having an empty array like,

  users: any = [];

Then i am making a service call in ngOnInit to store the data into users array like,

  ngOnInit() {

    //Getting the data from json
    this.httpClient.get('').subscribe((response: any) => {
      console.log("response", response.data);
      response.data.forEach(element => {
        //Pusing the data to users array
        this.users.push(element);
      });
    })

    //Trying to get the plete array after push of the element from the service response data
    console.log("users array", this.users);
    //But it shows empty array
  }

But i am unable to get the data in console.log("users array", this.users); as because the service call makes a delay..

How to push the data into this.users and when we call outside of the service it should have the filled data and not empty as like now..

Also made a working stackblitz regarding it

Please see the console which has current result..

Current result in console.log("users array", this.users); is empty array [].

So i am expecting the following result in console.log("users array", this.users); outside the service and inside ngOnInit,

[
{"id":1,"value":"User One"},
{"id":2,"value":"User Two"},
{"id":3,"value":"User Three"}
]

As i am new in angular kindly help me to achieve the expected result..

I am making angular application and where i am having an empty array like,

  users: any = [];

Then i am making a service call in ngOnInit to store the data into users array like,

  ngOnInit() {

    //Getting the data from json
    this.httpClient.get('https://api.myjson./bins/n5p2m').subscribe((response: any) => {
      console.log("response", response.data);
      response.data.forEach(element => {
        //Pusing the data to users array
        this.users.push(element);
      });
    })

    //Trying to get the plete array after push of the element from the service response data
    console.log("users array", this.users);
    //But it shows empty array
  }

But i am unable to get the data in console.log("users array", this.users); as because the service call makes a delay..

How to push the data into this.users and when we call outside of the service it should have the filled data and not empty as like now..

Also made a working stackblitz regarding it https://stackblitz./edit/angular-q3yphw

Please see the console which has current result..

Current result in console.log("users array", this.users); is empty array [].

So i am expecting the following result in console.log("users array", this.users); outside the service and inside ngOnInit,

[
{"id":1,"value":"User One"},
{"id":2,"value":"User Two"},
{"id":3,"value":"User Three"}
]

As i am new in angular kindly help me to achieve the expected result..

• javascript
• arrays
• angular
• typescript
• angular6

3 Answers 3

Had forked you Stackblitz Demo

If you want to manipulate your data after the HTTP Client response, you can actually do so by playing with the RxJS operators. After those methods inside the pipe, when you subscribe to its final value, it will directly render to your template.

this.httpClient
  .get('https://api.myjson./bins/n5p2m')
  .pipe(
    map(response => response.data),
    tap(users => console.log("users array", users))    // users array [Object, Object, Object]
  )
  .subscribe(users => this.users = users);

If you don't want to use the RxJS Operators, you can still manipulate it after you had subscribed to its final value and perform your manual data manipulation

There's no need to perform the .forEach() to store the array of objects from your response.data as Angular had already perform it for you. So whenever you assign it as

this.users = response.data it will store your Array of Objects [Object, Object, Object]

this.httpClient
  .get('https://api.myjson./bins/n5p2m')
  .subscribe(response => this.users = response.data);  // This will directly store your response data in an array of objects.

You can store data in array without loop also.

ngOnInit() {

  //Getting the data from json
  this.httpClient.get('https://api.myjson./bins/n5p2m').subscribe((response: any) => {      
    this.users.push(...response.data)
    console.log("users array", this.users);  
  })            
}

Angular can use Promises and Observables to handle asynchronous operations such as this http get request. There's lots of information on this concept and here is a good starting point: Promise vs Observable

To further elaborate, you could wrap the http get request in a method that returns an Observable, and then subscribe to that method and wait for it to return a result before executing the log statement.