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ttiimmaacc

Loop over element, select and animate all descendants

Go to solution Solved by akapowl,

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I'm attempting to translate this jQuery code to Vanilla JS and replacing .find() has me stumped.
I'm trying to select all elements with class ".find-my", loop over each element to Stagger through it's descendants "span" when in view port.

Using helper method "isInViewPort()" I can select a single element with .querySelector() but .querySelectorAll() throws error "getBoundingClientRect is not a function"

Can I correctly use .selector() utility to animate all descendant elements of parent div ".find-my"
Is there a better way to use GSAP to check if elements are in the viewport?

CodePen
jQuery Code: (Commented out in CodePen)

var $window = $(window);

$window.scroll(function() {
triggerMessage();
});


function triggerMessage() {
  $('.find-my').each(function() {
    let $findMy = $(this);
    let $keys = $findMy.find('span');
    let $reverseKeys = $findMy.find('span');

    if($findMy.hasClass('animated')) {
      if(!isInViewport($keys, false)) {
        TweenMax.killTweensOf($keys);
        TweenMax.staggerTo($reverseKeys, 0.3, { opacity:0 }, 0.1);
        $findMy.removeClass('animated');
      }
    } else if(isInViewport($keys, true)) {
      if(!$findMy.hasClass('animated')) {
        TweenMax.killTweensOf($reverseKeys);
        TweenMax.staggerTo($keys, 0.3, { opacity:1 }, 0.1);
        $findMy.addClass('animated');
      }
    }
    if(isInViewport($keys, true)) {
      if(!$findMy.hasClass('animated')) {
        TweenMax.killTweensOf($reverseKeys);
        TweenMax.staggerTo($keys, 0.3, { opacity:1 }, 0.1);

        $findMy.addClass('animated');
      }
    } else {
      if($findMy.hasClass('animated')) {
        TweenMax.killTweensOf($keys);
        TweenMax.staggerTo($reverseKeys, 0.3, { opacity:0 }, 0.1);
        $findMy.removeClass('animated');
      }
    }
  });
}

function isInViewport(el) {
  if(typeof jQuery === "function" && el instanceof jQuery) {
    el = el[0];
  }
  var rect = el.getBoundingClientRect();

  if(el) {
    return (
      rect.top >= ((window.innerHeight*0.25) || (document.documentElement.clientHeight*0.25)) &&
      rect.left >= 0 &&
      rect.bottom <= ((window.innerHeight*0.75) || (document.documentElement.clientHeight*0.75)) &&
      rect.right <= (window.innerWidth || document.documentElement.clientWidth)
    );
  } else {
    return (
      rect.top >= 0 &&
      rect.left >= 0 &&
      rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
      rect.right <= (window.innerWidth || document.documentElement.clientWidth)
    );
  }
} 

 

See the Pen wvqMrQQ?editors=1010 by ttiimmaacc (@ttiimmaacc) on CodePen

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  • Solution

Hello @ttiimmaacc

 

GSAP's ScrollTrigger is a super powerful tool to do things like these. It might really help you with this.

 

Here is what your example could look like ( I just pushed the start and end away from the edges of the window for better visualization).

 

See the Pen b01fd41c0a80f02caa7803c413c41e37 by akapowl (@akapowl) on CodePen

 

 

 

 

Since version 3.8.0 ScrollTrigger also comes with a .isInViewport helper function - which for your needs in this case shoudln't really be neccessary though.

 

 

 

 

 

Before taking a deeper dive into the documentation, I would suggest checking out the getting started article:

 

 

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Thank you @akapowl

This is exactly the information I was looking for.
In hindsight, I should have spent my time learning what GSAP can do rather than attempting to translate the JQuery line for line. Classic beginner goof.

59349318.jpeg

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