home.ts

  goUp = () => {

    const parentNativeURL = this.savedParentNativeURLs.pop();

    (<any> window).resolveLocalFileSystemURL(parentNativeURL,
      (fileSystem) => {
      
        var reader = fileSystem.createReader();
      
        reader.readEntries(
          (entries) => {
            this.ngZone.run(()=> {
              this.items = entries;
            })
          }, this.handleError);
      }, this.handleError);
  }