Question

My scenario is that I want to use ngResource to retrieve lists of files from Google Drive. Drive paginates its results via the inclusion of a nextPageToken within the JSON response, null signifying no more results.

I need a promise or callback that refers to the completion of all pages, rather than after each page. Is there an elegant way for ngResource to handle this?

Was it helpful?

Solution

I don't think ngResource will inherently do anything like this for you by default, but you can do it by using a recursive closure and calling the ngResource inside it until you get all the data you are after.

var dataSet = [];
function getAllData(){
  var files = $resource('your url');
  files.get(function(data){
    if (data){
      dataSet.push(data); //or whatever   
      getAllData();
    }
  })();
}

Here is the tested version with actual Google Drive semantics

getAllFiles(nextLink:string){
    var self = this;
    if (nextLink) {
        var files = self.refs.resource(nextLink);
    } else {
        var files = self.refs.resource(this.DRIVE_URL);
    }
    files.get(function(data){
        console.log("fetched "+data.items.length);
        self.allFiles.push(data['items']);
        if (data['nextLink']){
            self.getAllFiles(data['nextLink']);
        }
    });
}
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