forked from Gitlink/forgeplus-react
241 lines
6.5 KiB
HTML
241 lines
6.5 KiB
HTML
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8" />
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<meta http-equiv="X-UA-Compatible" content="IE=edge" />
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<title>Scrollama Demo: Basic</title>
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<meta
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name="description"
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content="Scrollama Demo: Error when steps are children of multiple scrollable elements"
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/>
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<style>
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/* default / demo page */
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* {
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box-sizing: border-box;
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}
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html,
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body {
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margin: 0;
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padding: 0;
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font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
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Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
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}
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body {
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font-weight: 300;
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color: #2a2a2a;
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height: 100vh;
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}
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main {
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/* NO OVERFLOW HERE */
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}
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p,
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h1,
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h2,
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h3,
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h4,
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a {
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margin: 0;
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font-weight: 300;
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}
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a,
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a:visited,
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a:hover {
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color: #f30;
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text-decoration: none;
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border-bottom: 1px solid currentColor;
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}
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#intro {
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max-width: 40rem;
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margin: 1rem auto;
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text-align: center;
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}
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.intro__overline {
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font-size: 1.4rem;
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}
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.intro__hed {
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font-size: 1.4rem;
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margin: 1.5rem auto;
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text-transform: uppercase;
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font-weight: 900;
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letter-spacing: 0.05em;
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}
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.intro__dek {
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font-size: 1.4rem;
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margin-bottom: 1rem;
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}
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/* demo */
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#bottom-spacer {
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height: 100vh;
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}
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/* scrollama */
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#step-container-element {
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position: relative;
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height: 500px;
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width: 50vw;
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overflow-y: scroll;
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}
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.scroll__text {
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position: relative;
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padding: 0 1rem;
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margin: 0 auto;
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width: 33%;
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}
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.step {
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margin: 2rem auto 4rem auto;
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border: 1px solid #333;
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background-color: #fff;
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}
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.step.is-active {
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background-color: lightgoldenrodyellow;
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}
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.step p {
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text-align: center;
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padding: 1rem;
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font-size: 1.5rem;
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}
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.section_title {
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position: sticky;
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top: 0;
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}
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nav {
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position: fixed;
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top: 0;
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left: 0;
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z-index: 1000;
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background: white;
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padding: 1rem;
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}
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</style>
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</head>
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<body>
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<main>
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<section id="intro">
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<p class="intro__overline">
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<a href="https://github.com/russellgoldenberg/scrollama"
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>scrollama.js</a
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>
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</p>
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<h1 class="intro__hed">
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Scrollama throws an error when steps are children of a scrollable
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element
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</h1>
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<p class="intro__dek">
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Calculating the scroll direction is problematic when steps are
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children of a scrollable element that isn't the page scroll. This page
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provides an example of what not to do:
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<strong>do NOT place steps inside a scrollable element</strong> with
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<em>overflowY: scroll</em> or <em>overflowY: auto</em> and fixed
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height.
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</p>
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<p class="intro__dek">To demonstrate the incorrect behavior:</p>
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<ul class="intro__dek">
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<li>
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ensure that the olive-colored element intersects the trigger (the
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dotted line)
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</li>
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<li>move the mouse pointer inside the olive-colored element</li>
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<li>
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scroll up and down with the mouse pointer inside the colored
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container. You may have to scroll up and down several times before
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the direction calculation becomes incorrect
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</li>
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</ul>
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<p class="intro__dek">
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<strong
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>Notice that step events are not triggered correctly when the inner
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container scrolls without the window element scrolling.</strong
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>
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</p>
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</section>
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</main>
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<script src="./d3.v4.min.js"></script>
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<script src="https://unpkg.com/intersection-observer"></script>
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<script src="../build/scrollama.js"></script>
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<script>
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function buildSection(
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title,
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parentSelector,
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sectionId,
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nSteps,
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stepHeight,
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background
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) {
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var scroll = d3
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.select(parentSelector)
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.append("section")
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.append("div")
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.classed("scroll__text", true)
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.attr("id", sectionId)
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.style("background", background);
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scroll
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.append("div")
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.append("h2")
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.classed("section_title", true)
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.html(title);
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var data = d3.range(nSteps);
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scroll
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.selectAll("div.step")
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.data(data)
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.enter()
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.append("div")
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.classed("step", true)
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.attr("data-step", function(datum) {
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return datum.toString();
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})
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.style("height", stepHeight + "px")
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.append("p")
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.html(function(datum) {
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return "STEP " + datum;
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});
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return scroll.node();
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}
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function buildScroller(sectionId) {
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var scroller = scrollama()
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.setup({
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step: "#" + sectionId + " .step",
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debug: true,
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offset: 0.9,
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progress: true
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})
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.onStepEnter(function handleStepEnter(response) {
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console.log(response.index, "-------- enter");
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response.element.classList.add("is-active");
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})
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.onStepExit(function handleStepExit(response) {
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console.log(response.index, "-------- exit");
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response.element.classList.remove("is-active");
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})
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.onStepProgress(function handleStepProgress(response) {
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console.log(
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response.index,
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"-------- progress -",
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response.progress
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);
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});
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// setup resize event
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window.addEventListener("resize", scroller.resize);
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}
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function init() {
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var scrollableStepContainerId = "step-container-element";
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buildSection(
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"I'm a scrollable element containing steps",
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"main",
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scrollableStepContainerId,
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5,
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150,
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"olive"
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);
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buildScroller(scrollableStepContainerId);
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d3.select("main")
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.append("div")
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.attr("id", "bottom-spacer");
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}
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// kick things off
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init();
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</script>
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</body>
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</html>
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