react-scroll-to-bottom/__tests__/scrolling-threshold.html at ee80f3ba4304f1c044fc8c10e20eb98021895f97 · compulim/react-scroll-to-bottom · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <title></title>
    <link href="/assets/index.css" rel="stylesheet" type="text/css" />
    <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
    <script src="/react-scroll-to-bottom.development.js"></script>
    <script src="/test-harness.js"></script>
    <script src="/assets/page-object-model.js"></script>
  </head>
  <body>
    <div id="app"></div>
  </body>
  <script type="text/babel" data-presets="react">
    'use strict';

    run(async function () {
      await new Promise(resolve =>
        ReactDOM.render(
          <ReactScrollToBottom.default
            className="react-scroll-to-bottom"
            followButtonClassName="follow"
            scrollViewClassName="scrollable"
            autoScrollThreshold={50}
          >
            {pageObjects.paragraphs.map(paragraph => (
              <p key={paragraph}>{paragraph}</p>
            ))}
          </ReactScrollToBottom.default>,
          document.getElementById('app'),
          resolve
        )
      );

      await pageObjects.scrollStabilizedAtBottom();

      expect(document.getElementsByClassName('follow')[0]).toBeFalsy();

      // Scroll up by 40px, which is within the 50px threshold
      // Note: mouseWheel(-40) might not translate exactly to 40px pixel scroll depending on implementation
      // But typically it should be enough to test "small scroll" vs "large scroll".
      // Let's try to set scrollTop directly if possible, but pageObjects is safer.
      // Assuming mouseWheel units are pixels or close to it.

      // Let's use a explicit scroll to be safe if pageObjects allows,
      // otherwise use mouseWheel and hope it maps linearly or use step-by-step.

      // Checking pageObjects.scrollStabilized usage in other files...

      await pageObjects.mouseWheel(-40);
      await pageObjects.scrollStabilized();

      // Should still be sticky, so NO follow button
      expect(document.getElementsByClassName('follow')[0]).toBeFalsy();

      // Scroll up another 20px, total 60px (> 50px)
      await pageObjects.mouseWheel(-20);
      await pageObjects.scrollStabilized();

      // Should show follow button now
      expect(document.getElementsByClassName('follow')[0]).toBeTruthy();
    });
  </script>
</html>