Ionic return a specific array item from JSON array

Question

I would like to retrieve a speicific array element from a returned JSON request. So far I can get the whole feed, but I am struggling how to restrict it to a specific element.

So far I have this in my service controller;

getJsonData(){
    return this.http.get('https://www.reddit.com/r/worldnews/.json').map(res => res.json());
}

In my page I have;

getdata() { 
    this.HttpModule.getJsonData().subscribe(
      result => {
        this.News= result.data.children(1);
        console.log("success:"+this.News);
      },
      err => {
        console.error("Error : "+err);
      },  
      () => {
        console.log("getData completed");
      }
    );
    }

It should be children by I tried children(1) as a guess but it didn't work

Did you try parsing your result to object with JSON.Parse and then accessing children[1]? — Raj
– Raj, Commented Jul 11, 2017 at 11:39

Gabriele Petrioli · Accepted Answer · 2017-07-11 10:49:34Z

1

The children property is an array, and in javascript to access array items you use [] (the bracket notation).

So use

this.News= result.data.children[1];

Also note that arrays in javascript are zero-based so the [1] will return the 2nd element

answered Jul 11, 2017 at 10:49

Gabriele Petrioli

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3 Comments

RedCrusador Over a year ago

This is the first thing I tried, unfortunatly this does not work: TypeError: result.data.children is not a function

Gabriele Petrioli Over a year ago

@RedCrusador just to make sure, you used square brackets [] and not parenthesis () and you still got the error about not a function ?

RedCrusador Over a year ago

Yes thats what I got back, they are [ ]

Tanmay Patil · Accepted Answer · 2017-07-11 10:47:13Z

0

Assuming result.data is array . we can do

for ( let item of result.data)
{
   console.log(item.field1);
   console.log(item.field2);

}

answered Jul 11, 2017 at 10:47

Tanmay Patil

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1 Comment

RedCrusador Over a year ago

Yes say if I want the 1000 th element does that mean I have to iterate through the 999 items to get there?

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