diff --git a/src/plugin/affix.directive.ts b/src/plugin/affix.directive.ts
index 7bc8221..217a242 100644
--- a/src/plugin/affix.directive.ts
+++ b/src/plugin/affix.directive.ts
@@ -25,8 +25,14 @@ export interface ScrollSpyAffixOptions {
   }
 })
 export class ScrollSpyAffixDirective implements AfterViewInit, OnDestroy {
-  @Input('scrollSpyAffix') options: ScrollSpyAffixOptions;
+  @Input('scrollSpyAffix') public options: ScrollSpyAffixOptions;
 
+  public elementTop: number;
+  public elementBottom: number;
+  public affix: boolean = false;
+  public affixTop: boolean = false;
+  public affixBottom: boolean = false;
+  
   private defaultOptions: ScrollSpyAffixOptions = {
     topMargin: 0,
     bottomMargin: 0
@@ -37,12 +43,6 @@ export class ScrollSpyAffixDirective implements AfterViewInit, OnDestroy {
   private el: HTMLElement;
   private parentEl: any;
 
-  private elementTop: number;
-  private elementBottom: number;
-  private affix: boolean = false;
-  private affixTop: boolean = false;
-  private affixBottom: boolean = false;
-
   constructor(
     private ref: ChangeDetectorRef,
     private elRef: ElementRef,
diff --git a/src/plugin/index.component.ts b/src/plugin/index.component.ts
index 5ee5abd..e70b333 100644
--- a/src/plugin/index.component.ts
+++ b/src/plugin/index.component.ts
@@ -32,8 +32,15 @@ export interface ScrollSpyIndexComponentOptions {
   changeDetection: ChangeDetectionStrategy.OnPush
 })
 export class ScrollSpyIndexRenderComponent implements OnInit, AfterViewInit, OnDestroy {
-  @Input() scrollSpyIndexRenderOptions: ScrollSpyIndexComponentOptions;
+  @Input() public scrollSpyIndexRenderOptions: ScrollSpyIndexComponentOptions;
 
+  public stack: Array<any> = [];
+  public parentStack: Array<any> = [];
+  public lastItem: any;
+
+  public currentScrollPosition: number;
+  public itemsToHighlight: Array<string> = [];
+  
   @ViewChild('container', { read: ViewContainerRef })
   private viewContainerRef: ViewContainerRef;
 
@@ -47,13 +54,6 @@ export class ScrollSpyIndexRenderComponent implements OnInit, AfterViewInit, OnD
 
   private el: HTMLElement;
 
-  private stack: Array<any> = [];
-  private parentStack: Array<any> = [];
-  private lastItem: any;
-
-  private currentScrollPosition: number;
-  private itemsToHighlight: Array<string> = [];
-
   constructor(
     private compiler: Compiler,
     private ref: ChangeDetectorRef,
diff --git a/src/plugin/index.directive.ts b/src/plugin/index.directive.ts
index b60e926..9418d00 100644
--- a/src/plugin/index.directive.ts
+++ b/src/plugin/index.directive.ts
@@ -20,7 +20,7 @@ export interface ScrollSpyIndexOptions {
   selector: '[scrollSpyIndex]'
 })
 export class ScrollSpyIndexDirective implements OnInit, AfterViewInit, OnDestroy {
-  @Input('scrollSpyIndex') options: ScrollSpyIndexOptions;
+  @Input('scrollSpyIndex') public options: ScrollSpyIndexOptions;
 
   private defaultOptions: ScrollSpyIndexOptions = {
     selector: 'anchor'
diff --git a/src/plugin/infinite.directive.ts b/src/plugin/infinite.directive.ts
index 39ada22..4b5250d 100644
--- a/src/plugin/infinite.directive.ts
+++ b/src/plugin/infinite.directive.ts
@@ -21,10 +21,10 @@ export interface ScrollSpyInfiniteOptions {
   selector: '[scrollSpyInfinite]'
 })
 export class ScrollSpyInfiniteDirective implements OnInit, AfterViewInit, OnDestroy {
-  @Input('scrollSpyInfinite') options: ScrollSpyInfiniteOptions;
-  @Input() scrollSpyInfiniteDisabled: boolean;
+  @Input('scrollSpyInfinite') public options: ScrollSpyInfiniteOptions;
+  @Input() public scrollSpyInfiniteDisabled: boolean;
 
-  @Output() scrollSpyInfiniteEvent: EventEmitter<any> = new EventEmitter();
+  @Output() public scrollSpyInfiniteEvent: EventEmitter<any> = new EventEmitter();
 
   private defaultOptions: ScrollSpyInfiniteOptions = {
     spyId: 'window',
diff --git a/src/plugin/parallax.directive.ts b/src/plugin/parallax.directive.ts
index baefcee..1120f55 100644
--- a/src/plugin/parallax.directive.ts
+++ b/src/plugin/parallax.directive.ts
@@ -51,9 +51,12 @@ export interface ScrollSpyParallaxOptions {
   selector: '[scrollSpyParallax]'
 })
 export class ScrollSpyParallaxDirective implements OnInit, AfterViewInit, OnDestroy {
-  @Input('scrollSpyParallax') options: ScrollSpyParallaxOptions;
-  @Input() scrollSpyParallaxDisabled: boolean;
+  @Input('scrollSpyParallax') public options: ScrollSpyParallaxOptions;
+  @Input() public scrollSpyParallaxDisabled: boolean;
 
+  public cssValue: string;
+  public isSpecialVal: boolean = false;
+  
   private defaultOptions: ScrollSpyParallaxOptions = {
     spyId: 'window',
     horizontal: false,
@@ -69,9 +72,6 @@ export class ScrollSpyParallaxDirective implements OnInit, AfterViewInit, OnDest
 
   private el: HTMLElement;
 
-  private cssValue: string;
-  private isSpecialVal: boolean = false;
-
   constructor(
     private renderer: Renderer,
     private elRef: ElementRef,