examples/amp-position-observer.amp.html - main - githubmirror/amphtml

examples/amp-position-observer.amp.html
160 строк5 KB
Daniel Rozenberg
Replace URLs of sample videos from soon-to-be-shutdown Google Cloud storage bucket to Netlify (#40486)
25 фев 2026, 21:15
25 фев 2026, 21:15f45b5ec
<!doctype html>
<html ⚡ lang="en">

<head>
  <meta charset="utf-8">
  <title>amp-position-observer</title>
  <link rel="canonical" href="amps.html">
  <meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1">
  <script async custom-element="amp-animation" src="https://cdn.ampproject.org/v0/amp-animation-0.1.js"></script>
  <script async custom-element="amp-position-observer" src="https://cdn.ampproject.org/v0/amp-position-observer-0.1.js"></script>
  <style amp-custom>
    main {
      font-family: Helvetica, sans-serif;
      padding: 10px;
      max-width: 412px;
      margin: auto;
    }

    h1, h2, h3, h4 {
      font-weight: normal;
    }

    amp-img img {
      object-fit: cover;
    }

    .clock-hand {
      position: absolute;
      width: 2vw;
      height: 20vw;
      max-height: 90px;
      max-width: 10px;
      top: 50%;
      left: 50%;
      z-index: 2;
      background: #FAFAFA;
      transform-origin: 50% 0%;
      border-radius: 10px;
      transform: rotate(-180deg)
    }

    .spacer {
      height: 70vh;
      width: 100%;
      background-image: -webkit-linear-gradient(#EEE 50%, white 50%);
      background-image: linear-gradient(#EEE 50%, white 50%);
      background-size: 100% 3em;
    }

    pre {
      display: inline;
    }
  </style>
  <style amp-boilerplate>body{-webkit-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:-amp-start 8s steps(1,end) 0s 1 normal both;animation:-amp-start 8s steps(1,end) 0s 1 normal both}@-webkit-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}</style><noscript><style amp-boilerplate>body{-webkit-animation:none;-moz-animation:none;-ms-animation:none;animation:none}</style></noscript>
  <script async src="https://cdn.ampproject.org/v0.js"></script>
</head>

<body>
  <amp-animation id="clockAnim1" layout="nodisplay">
    <script type="application/json">
      {
      "duration": "3s",
      "fill": "both",
      "direction": "alternate",
      "animations": [
        {
          "selector": "#clock-scene-1 .clock-hand",
          "keyframes": [
            { "transform": "rotate(-180deg)" },
            { "transform": "rotate(0deg)" }
          ]
        }
      ]
    }
    </script>
  </amp-animation>

  <amp-animation id="clockAnim2" layout="nodisplay">
    <script type="application/json">
      {
      "duration": "6s",
      "fill": "both",
      "iterations": "infinity",
      "animations": [
        {
          "selector": "#clock-scene-2 .clock-hand",
          "keyframes": [
            { "transform": "rotate(-180deg)" },
            { "transform": "rotate(180deg)" }
          ]
        }
      ]
    }
    </script>
  </amp-animation>
  <main>
    <div class="spacer"></div>

    <h2>Scrollbound animations with amp-position-observer and amp-animation</h2>
    <h3>The following animation does one round (12pm-6pm) via scrolling when fully visible between the middle 80% of the viewport</h3>

    <div id="clock-scene-1" class="clock-scene">
      <amp-position-observer
        intersection-ratios="1"
        viewport-margins="10vh"
        on="scroll:clockAnim1.seekTo(percent=event.percent)"
        layout="nodisplay">
      </amp-position-observer>

      <amp-img layout="responsive" width=2 height=1.5 src="./img/clock.jpg">
        <div class="clock-hand"></div>
      </amp-img>
    </div>

    <div class="spacer"></div>

    <h2>Custom visibility start-end with amp-position-observer and amp-animation</h2>
    <h3>The following animation will start when the scene is 50% visible and pauses when 50% invisible</h3>

    <div id="clock-scene-2" class="clock-scene">
      <amp-position-observer
        intersection-ratios="0.5"
        on="enter:clockAnim2.start;exit:clockAnim2.pause"
        layout="nodisplay">
      </amp-position-observer>

      <amp-img layout="responsive" width=2 height=1.5 src="./img/clock.jpg">
        <div class="clock-hand"></div>
      </amp-img>
    </div>

    <div class="spacer"></div>
    <h2>Custom visibility end with amp-position-observer and amp-video</h2>
    <h3>If played, the following video will pause when 20% invisible</h3>
    <div>
      <amp-position-observer
        intersection-ratios="0.8"
        on="exit:myVideo.pause"
        layout="nodisplay">
      </amp-position-observer>

      <amp-video
        id=myVideo
        title="Big Buck Bunny"
        artist="Blender Foundation"
        poster="img/bigbuckbunny.jpg"
        album="The Peach Open Movie Project"
        src="https://amp-sample-videos.netlify.app/BigBuckBunny.mp4"
        width="720"
        height="405"
        layout="responsive"
        controls>
    </amp-video>
    </div>

    <div class="spacer"></div>
    <div class="spacer"></div>
  </main>
</body>
</html>