Facebook API Question posted in
The official documentation for the Facebook APIs can be found here.

ForEach element do promise to get a final sum angular

I’m trying to set a counter of likes using facebook’s GRAPH API.
I have a list of object ids, and for earch ID, I use an api call to get how many likes this object got, then set a sum.

But this call is returning a promise, and when I’m using foreach, only one call is rearched even if I have more than one element in my list.

How can I do this to get this summation ?
Here’s my code. 

countLike(data : any[]){
  let counter : number = 0;

  data.forEach(element => {
    this.debogger.debogSomething("Reached : " + element as string);
      this.facebook.api("/"+ (element as string) +"?fields=likes", ["public_profile","user_posts"]).then((response) => { 
        counter += response.likes.data.length as number;
        this.debogger.debogSomething(counter);  
    }).catch((err) => {
      this.debogger.debogSomething(err);
    });
  });
}

It’s my first post in stackoverflow!
Thank you so much !

**[EDIT] new code, still not working **

countLike(){
  Promise.all(this.objectIdsToFilter.map((value) => {
    return this.facebook.api(value+"?fields=likes", ["public_profile","user_posts"])
  }))
  .then((response) => { 
    this.debogger.debogSomething(response)
  })
  .catch(err=>{
    this.debogger.debogSomething(err);
  })
}

In input, an array contains 3 values, (2 valids, 1 invalid).
The output : nothing happens (weird, the debogger is a pop-up).

Tags:

2

Answers


  1. 0

    You can probably do something like below:-

    countLike(data: any[]) {
    let counter: number = 0;

    Promise.all(data.map(element) => {
        this.debogger.debogSomething("Reached : " + element as string);
        this.facebook.api("/" + (element as string) + "?fields=likes", ["public_profile", "user_posts"])
    }).then((response) => {
        counter = response.reduce((sum, res) => {
            sum += res.likes.data.length ;
        }, 0);

        this.debogger.debogSomething(counter);
    }).catch((err) => {
        this.debogger.debogSomething(err);
    });

}
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  2. 0

    You can also use the new async await method (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function) if the promise concept is difficult for you.

    Also there’s this async module (https://caolan.github.io/async/docs.html) which you can use in js that has several methods such as waterfall which is exactly what you need, as the author says:

    Runs the tasks array of functions in series, each passing their results to the next in the array.

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