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HTML

              
                <div class="fullpage" id="fullpage">
  <div class="fullpage__section">
    <div class="fullpage__content">
      <h2>Snapping fullscreen panels with Greensock + ScrollMagic</h2>
      <h4>This demo uses Greensock + ScrollMagic to achieve an effect similar to <a href="https://alvarotrigo.com/fullPage/">fullpage.js</a> or <a href="https://guidobouman.github.io/jquery-panelsnap/">jQuery.panelsnap.js</a></h4>
      <p>Thanks to <a href="http://unsplash.com">Unsplash.com</a> for the amazing stock photos</p>
    </div>
  </div><!-- .fullpage__section -->
  <div class="fullpage__section">

  </div><!-- .fullpage__section -->
  <div class="fullpage__section">

  </div><!-- .fullpage__section -->
  <div class="fullpage__section">

  </div><!-- .fullpage__section -->
  <div class="fullpage__section">

  </div><!-- .fullpage__section -->
  <div class="fullpage__section">

  </div><!-- .fullpage__section -->
</div><!-- .fullpage -->
              
            
!

CSS

              
                html, body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
}
.fullpage {
  &__section {
    display: table;
    height: 100vh;
    width: 100%;
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center center;
    &:nth-child(1) {
      background-color: blue;
      background-image: url(https://images.unsplash.com/photo-1476988186444-a7189cf07b3f?dpr=2&auto=format&fit=crop&w=1500&h=1000&q=80&cs=tinysrgb&crop=);
    }
    &:nth-child(2) {
      background-color: red;
      background-image: url(https://images.unsplash.com/photo-1478145046317-39f10e56b5e9?dpr=2&auto=format&fit=crop&w=1500&h=2250&q=80&cs=tinysrgb&crop=);
    }
    &:nth-child(3) {
      background-color: yellow;
      background-image: url(https://images.unsplash.com/photo-1436379597301-690adc63f244?dpr=2&auto=format&fit=crop&w=1500&h=1000&q=80&cs=tinysrgb&crop=);
    }
    &:nth-child(4) {
      background-color: green;
      background-image: url(https://images.unsplash.com/photo-1484599379766-aa5e119b0066?dpr=2&auto=format&fit=crop&w=1500&h=1000&q=80&cs=tinysrgb&crop=);      
    }
    &:nth-child(5) {
      background-color: purple;
      background-image: url(https://images.unsplash.com/photo-1484815843298-2c13cbc1b66f?dpr=2&auto=format&fit=crop&w=1500&h=1001&q=80&cs=tinysrgb&crop=);
    }
    &:nth-child(6) {
      background-color: aqua;
      background-image: url(https://images.unsplash.com/photo-1484882918957-e9f6567be3c8?dpr=2&auto=format&fit=crop&w=1500&h=1875&q=80&cs=tinysrgb&crop=);
    }
  }
  &__content {
    text-align: center;
    display: table-cell;
    vertical-align: middle;
  }
}

.is-locked {
	overflow: hidden;
}

.is-scrolllocked { // Specifically for iOS
	overflow: hidden;
	height: 100vh;
}
              
            
!

JS

              
                $(window).on('load', gsapScrollPanel);


function gsapScrollPanel() {
  
  var controllerScrollPanel,
    scrollSceneDefaultForward,
    scrollSceneDefaultReverse,
    resizeTimer;

  
  // If the .fullpage container exists, set up the fullpage section animations
  if ( $('.fullpage').length ) {
    initController();
    handleResize();
  }

  
  // Initialize the scrollMagic controller
  function initController() {
    
    // Init new controller
    controllerScrollPanel = new ScrollMagic.Controller();

    // Change behaviour of controller to animate scroll instead of jump
    controllerScrollPanel.scrollTo(function (newpos) {
      TweenMax.to(window, 0.5, {scrollTo: {y: newpos, autoKill:false}});
    });

    // Init the forward and reverse scenes
    scrollPanelScenes();
  }

  
  // If window is resized, destroy controller and reset once resize has stopped
  function handleResize() {
    $(window).resize(function() {
      destroyScrollPanels();
      clearTimeout(resizeTimer);
      resizeTimer = setTimeout(doneResizing, 500);
    });
    function doneResizing(){
      reInitScrollPanels();
    }
  }

  
  // Destroy scroll panels
  function destroyScrollPanels() {
    controllerScrollPanel.destroy();
    scrollSceneDefaultForward.destroy();
    scrollSceneDefaultReverse.destroy();
  }

  
  // Re-init scroll panels
  function reInitScrollPanels() {
    controllerScrollPanel = null;
    scrollSceneDefaultForward = null;
    scrollSceneDefaultReverse = null;
    initController();
  }


  // The forward and reverse scenes
  function scrollPanelScenes() {

    // Create scenes for panels, when scrolling forward
    $('.fullpage__section').each(function(index, elem) {
      var $scrollPanel = $(elem);
      var forwardScrollPos = $scrollPanel.offset().top;

      scrollSceneDefaultForward = new ScrollMagic.Scene({
        offset: 10, // Number of pixels user can scroll before panel snaps into place
        triggerElement: elem,
        triggerHook: 1,// Trigger this scene when top of panel enters view
      })
      .on('start', function(event) {
        if (event.scrollDirection == 'FORWARD') {
          controllerScrollPanel.scrollTo(forwardScrollPos); // If direction is forward, trigger scrollTo
        } else if (event.scrollDirection == 'REVERSE') {
          // Do nothing
        }
      })
      // Prevent problems with momentum scrolling by pausing for a period of time
      .on('enter', function(event) {
        $('body').addClass('is-locked');
        setTimeout(function() {
          $('body').removeClass('is-locked');
        },1200)
      })
      .addTo(controllerScrollPanel);
    })


    // Create scenes for panels, when scrolling reverse
    $('.fullpage__section:nth-child(n+2)').each(function(index, elem) {
      var $scrollPanel = $(elem);
      var reverseScrollPos = $scrollPanel.prev().offset().top;

      scrollSceneDefaultReverse = new ScrollMagic.Scene({
        offset: -10, // Number of pixels user can scroll before panel snaps into place
        triggerElement: elem,
        triggerHook: 0,// Trigger this scene when bottom of panel enters view
      })
      .on('start', function(event) {
        if (event.scrollDirection == 'FORWARD') {
          // Do nothing
        } else if (event.scrollDirection == 'REVERSE') {
          controllerScrollPanel.scrollTo(reverseScrollPos); // If direction is reverse, trigger scrollTo
        }
      })
      // Prevent problems with momentum scrolling by pausing for a period of time
      .on('leave', function(event) {
        $('body').addClass('is-locked');
        setTimeout(function() {
          $('body').removeClass('is-locked');
        },1200)
      })
      .addTo(controllerScrollPanel);
    })

  }

}
              
            
!
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