My code samples

samples.ts

/// Storage
// Check if data is stored locallyget new
this.storage.ready().then(() => {
  this.storage.get('articles').then((value) => {
    if (value === null) {
      this.article.loadData().then((data) => {
        this.storage.set('articles', data)
        this.newsData = data;
      });
    } else {
      this.newsData = value;

      // Check if new data is available
      this.article.loadData().then((newData) => {
        let hold; hold = newData;
        if (hold.length > value.length) {
          this.storage.set('articles', hold);
          this.newsData = hold;
        }
      });
    }
  });
});

// Observable to check for new data
Observable.interval(500 * 60).subscribe(x => {
  let hold = [];
  this.article.loadData().then((data) => {
    hold.push(data);
    if (hold[0].length > this.newsData.length) {
      this.storage.set('articles', data);
      this.events.publish('new data', data);
    }
  });
});

// Normal Angular API call
let body = JSON.stringify({ newspaper: this.newspaper });
let headers = new Headers({'Content-Type': 'application/json'});

this.http.post('http://demo.sprypixels.com/thescroll/public/api/newspaper', body, {headers: headers}).subscribe((data) => {
  if(data.json().success.length > 0) {
    this.loaded = true;
    this.newspapers = data.json().success;
  } else {
    this.loaded = true;
    this.nothingFound = true;
  }
}, (err) => {
  console.log(err.json());
});