bmoren / scrollyclasser

a very lightweight class / css animation & transition based scrollytelling library

scrollyclasser

A lightweight scrollytelling library for adding and removing classes

scrollyclasser uses the intersection observer API to add and remove classes from elements when they enter / exit the viewport

See a Demo project on 🎏 Glitch.com: https://glitch.com/edit/#!/intersection-observer-starter-kit

Adding scrollyclasser to your project

Add scrollyclasser.js to the very bottom of your page just before the closing </body> tag

using a CDN:

<script src="https://cdn.jsdelivr.net/gh/bmoren/scrollyclasser/scrollyclasser.js"></script>
<!-- This should be just above your closing </body> tag -->

using scrollyclasser

making an element ovservable

Add the class observe to any element to make it observable by scrollyclasser

   <p class="observe"> I'm being watched!</p>

You can add additional classes with the space seperator, no problem...

  <p class="observe specialStyles"> I'm being watched!</p>

Adding classes to an element when it comes into view

Add the data attribute data-enter-add followed by any class names you'd like to add when the element comes into view

    <p class="observe specialStyles" data-enter-add="spin fadeIn"> I'm being watched!</p>
    <!-- adds the spin and fadeIn classes when the element comes into view -->

Removing classes from an element when it leaves view

Add the data attribute data-exit-remove followed by any class names you'd like to remove when the element leaves view. Optionally, you can choose to not specify this data attribute if you do not want to remove the classes.

   <p class="observe specialStyles" data-enter-add="spin fadeIn"  data-exit-remove="spin fadeIn"> I'm being watched!</p>
   <!-- adds the spin and fadeIn classes when the element comes into view & removes them when it leaves view -->

Targeting other elements on the page!

You can also have classes added / removed from a target element when an observable element enters the page. This opens new opportunites for dynamics and expression!

Adding classes to a target to an element when it comes into view

Add the data attribute data-enter-target to choose a target class of an element on the page you'd like to target Add the data attribute data-target-add to choose a class you'd like to add to the element that was targeted or Add the data attribute data-target-remove to choose a class you'd like to remove to the element that was targeted

   <p class="observe specialStyles" data-enter-target="snow"  data-target-add="spin" > I'm being watched!</p>

   <div class="snow"> </div>