on-viewport-plugin-js-example.js

$('#checkIfIsOnViewport').click(function(){
  $('.testToSeeIfIsOnViewport').OnViewport(function(){
      // Element is on viewport 
      // alert("Element Is On Window Viewport");
      console.log($(this));
      $(this).fadeOut();
  },function(){
      // Element is not on Viewport 
      // alert("Element is not on Window Viewport");
      console.log($(this));
      $(this).fadeIn();
  });
});