Issues involving the functionality of the Intersection Observer API in combination with the Bootstrap

I'm currently facing an issue with the Intersection Observer API. My goal is to trigger an animation when the intersectionRatio reaches at least 40%. Here's the code I'm using:

if(entry.intersectionRatio > 0.40){
  DO SOMETHING
}

However, I keep getting intersection ratios like "0.0xxxx" or even lower than "0.00xxxx". For instance, right now, I'm seeing an intersection ratio in the console as 0.007672634441405535. While I could try using these values to trigger my animations, they are highly unpredictable and the element never fully comes into view since it never reaches an intersectionRatio of 1, even when it's completely visible. I want to identify the error and learn how to rectify it. I'm utilizing Bootstrap, and removing the framework's scripts did not resolve the issue.

You can check out the website; the section I'm referring to is the cards below the "Meet the team" title. The script I have will log the intersection ratios of the card elements to the console when you scroll to that section.

Thank you for your assistance.

javascripttwitter-bootstrapbootstrap-4

Answer №1

Make sure to include the OPTIONS when using IntersectionObserver, as not doing so will result in default settings being used.

Check out: https://developer.mozilla.org/es/docs/Web/API/Intersection_Observer_API

To apply this to your specific case, consider the following code:

const observer = new IntersectionObserver((entries) => {
  entries.forEach(entry => {
    console.log("The intersectionRatio is:  " + entry.intersectionRatio);
    if (entry.intersectionRatio > 0.40) {
      cards.forEach(card => {
        card.classList.add("animate");
      });
    }
  });
}, {
  root: null,
  rootMargin: '0px',
  threshold: 1.0
});

I hope that explanation helps clarify things for you.

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