Event to detect when position:sticky is triggered

Putting pedal to the metal – up booster performance

To throw caution to the wind and prevent your app from crawling like a snail during scrolls, remember to throttle scroll events. It’s like telling your app to sip and not gulp the events.

Thinking of a way out? Embrace a throttling utility or dear old lodash’s throttle, and watch it wave its magic wand.

Digging up the scrollable ancestors

Occasionally, position:sticky might throw tantrums and act up due to overflow. Gear up with JavaScript to find the first scrollable parent for smooth sticky detection:

function getFirstScrollableParent(node) {
  let parent = node.parentElement;
  while (parent) {
    // Tightening the leash on defiant parents!
    if ((/auto|scroll/).test(getComputedStyle(parent)['overflow-y'])) {
      return parent;
    }
    parent = parent.parentElement;
  }
  return window; // If nothing works out, window is your rescue buddy!
}


Advocating dynamic UI updates

It’s a good practice to add or strip off CSS classes for elements that turned sticky. It gives the user a heads up, and also adds a cool touch to your UI.

observer.observe(sentinel);
function observer(entries) {
  entries.forEach(entry => {
    // Bam! Sticky enters the battlefield with an 'is-stuck' badge.
    stickyElement.classList.toggle('is-stuck', !entry.isIntersecting);
  });
}


Don't forget to deck up your styles.css with catchy styles for the .is-stuck class!

Checking for native support

It's a sad reality that not all browsers welcome position:sticky with open arms. But fear not! Before you rack your brains on why sticky isn't working, check if your browser is game for sticky positioning:

if (CSS.supports('position', 'sticky')) {
  // Your moment of genius resides here!
}


This ensures your code doesn't wander off in non-supportive browsers.

Musing over third-party tools

While you can't beat the charm of native CSS features, some libraries like ScrollToFixed might come in handy to cope with sticky elements. However, beware! Heavy-lifting polyfills might slow down your code’s performance.

And oh, keep a watchful eye on CORS issues when dealing with position: sticky polyfills. You don't want to bump into errors while accessing resources from different domains.

A byte of wisdom from industry pros

Enrich your knowledge by grasping insights from seasoned experts, such as Paul Irish. Oh, the wonderful ways you can understand position:sticky, and triumph over its odd behaviors!