home.ts

  goDown = (item) => {

    let childName = this.items[0].name;
    let childNativeURL = this.items[0].nativeURL;

    const parentNativeURL = childNativeURL.replace(childName, '');

    this.savedParentNativeURLs.push(parentNativeURL);

    var reader = item.createReader();

    reader.readEntries(
      (children) => {
        this.ngZone.run(()=> {
          this.items = children;
        })
      }, this.handleError);
  }