KeepTrack-CSS/index.html at master · robinpoort/KeepTrack-CSS · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>KeepTrack — Visual Test</title>
  <link rel="stylesheet" href="styles.css">
</head>
<body>

  <!-- ==============================
       1. Sticky header + scroll-padding
       ============================== -->
  <header id="site-header" data-keeptrack="height" data-keeptrack-scroll-padding style="position: sticky; top: calc(var(--header-offset, 0px));">
    <div class="header-inner">
      <strong>Sticky Header</strong>
      <span class="stuck-indicator">Not stuck</span>
      <span class="header-info">
        --site-header-height: <code class="val-header-height">…</code> |
        --site-header-stuck: <code class="val-header-stuck">…</code>
      </span>
    </div>
  </header>

  <!-- ==============================
       Second sticky bar (sub-nav)
       Unsticks when its container ends
       ============================== -->
  <main>
  <div class="subnav-container">
    <nav id="sub-nav" data-keeptrack="height" data-keeptrack-scroll-padding style="position: sticky; top: var(--site-header-height, 0);">
      <div class="subnav-inner">
        <span class="stuck-indicator subnav-stuck-indicator">Not stuck</span>
        <a href="#section-basics">Basics</a>
        <a href="#section-targets">Targets</a>
        <a href="#section-features">Features</a>
        <a href="#section-api">API</a>
        <a href="#section-anchors">Anchors</a>
        <span class="header-info">
          --sub-nav-height: <code class="val-subnav-height">…</code> |
          --sub-nav-stuck: <code class="val-subnav-stuck">…</code>
        </span>
      </div>
    </nav>

    <!-- ==============================
         Basics
         ============================== -->
    <h2 id="section-basics" class="section-heading">Basics</h2>

    <!-- ==============================
         2. Basic tracking (no id)
         ============================== -->
    <section class="test-section">
      <h2>Basic tracking (no id)</h2>
      <p>Tracks <code>height</code> and <code>width</code> on the element itself.</p>
      <div class="box resizable" data-keeptrack="height, width">
        <span>Resize me</span>
        <span class="box-info">
          --height: <code class="val-basic-height">…</code><br>
          --width: <code class="val-basic-width">…</code>
        </span>
      </div>
    </section>

    <!-- ==============================
         3. Tracking with id (on :root)
         ============================== -->
    <section class="test-section">
      <h2>Tracking with id (on :root)</h2>
      <p>Sets <code>--tracked-box-height</code> on <code>:root</code>.</p>
      <div id="tracked-box" class="box resizable" data-keeptrack="height">
        <span>Resize me</span>
        <span class="box-info">--tracked-box-height: <code class="val-id-height">…</code></span>
      </div>
      <div class="box consumer">
        This box uses <code>var(--tracked-box-height)</code> as its min-height.
      </div>
    </section>

    <!-- ==============================
         4. Tracking with data-keeptrack-id (on :root)
         ============================== -->
    <section class="test-section">
      <h2>Tracking with data-keeptrack-id (on :root)</h2>
      <p>Sets <code>--alias-box-height</code> on <code>:root</code> without a real <code>id</code>.</p>
      <div class="box resizable" data-keeptrack="height" data-keeptrack-id="alias-box">
        <span>Resize me</span>
        <span class="box-info">--alias-box-height: <code class="val-dataid-height">…</code></span>
      </div>
      <div class="box consumer">
        This box uses <code>var(--alias-box-height)</code> as its min-height.
      </div>
    </section>

    <!-- ==============================
         Targets
         ============================== -->
    <h2 id="section-targets" class="section-heading">Targets</h2>

    <!-- ==============================
         4. Target parent (numeric)
         ============================== -->
    <section class="test-section">
      <h2>Target parent (numeric: 2 levels up)</h2>
      <p>Sets <code>--height</code> on the grandparent <code>.grandparent</code>.</p>
      <div class="grandparent">
        <span class="box-info">--height on grandparent: <code class="val-parent-num">…</code></span>
        <div class="parent-box">
          <div class="box resizable" data-keeptrack="height" data-keeptrack-target-parent="2">
            <span>Resize me</span>
          </div>
        </div>
      </div>
    </section>

    <!-- ==============================
         5. Target parent (CSS selector)
         ============================== -->
    <section class="test-section">
      <h2>Target parent (selector: .wrapper)</h2>
      <p>Uses <code>closest('.wrapper')</code> to find the target.</p>
      <div class="wrapper">
        <span class="box-info">--height on .wrapper: <code class="val-parent-sel">…</code></span>
        <div>
          <div class="box resizable" data-keeptrack="height" data-keeptrack-target-parent=".wrapper">
            <span>Resize me</span>
          </div>
        </div>
      </div>
    </section>

    <!-- ==============================
         6. Target parent with id (selector + id prefix)
         ============================== -->
    <section class="test-section">
      <h2>Target parent + id prefix</h2>
      <p>Sets <code>--my-sidebar-width</code> on <code>.layout</code>.</p>
      <div class="layout">
        <span class="box-info">--my-sidebar-width on .layout: <code class="val-target-id">…</code></span>
        <div id="my-sidebar" class="box resizable" data-keeptrack="width" data-keeptrack-target-parent=".layout">
          <span>Resize me</span>
        </div>
      </div>
    </section>

    <!-- ==============================
         Features
         ============================== -->
    <h2 id="section-features" class="section-heading">Features</h2>

    <!-- ==============================
         7. Multiple properties
         ============================== -->
    <section class="test-section">
      <h2>Multiple properties</h2>
      <p>Tracks <code>height, width, padding-top, border-radius</code>.</p>
      <div class="box resizable multi" data-keeptrack="height, width, padding-top, border-radius">
        <span>Resize me</span>
        <span class="box-info">
          --height: <code class="val-multi-h">…</code><br>
          --width: <code class="val-multi-w">…</code><br>
          --padding-top: <code class="val-multi-pt">…</code><br>
          --border-radius: <code class="val-multi-br">…</code>
        </span>
      </div>
    </section>

    <!-- ==============================
         8. Scrollbar dimensions
         ============================== -->
    <section class="test-section">
      <h2>Scrollbar dimensions</h2>
      <p>
        --scrollbar-width: <code class="val-scrollbar-w">…</code><br>
        --scrollbar-height: <code class="val-scrollbar-h">…</code>
      </p>
    </section>

    <!-- ==============================
         9. Poll mode (non-resize changes)
         ============================== -->
    <section class="test-section">
      <h2>Poll mode (non-resize changes)</h2>
      <p>Tracks <code>background-color</code> — hover the box to see it update.</p>
      <div class="box poll-box" data-keeptrack="background-color">
        <span>Hover me</span>
        <span class="box-info">--background-color: <code class="val-poll-bg">…</code></span>
      </div>
    </section>

    <!-- ==============================
         API
         ============================== -->
    <h2 id="section-api" class="section-heading">API</h2>

    <!-- ==============================
         10. Observe / Unobserve API
         ============================== -->
    <section class="test-section">
      <h2>Observe / Unobserve API</h2>
      <p>This element starts untracked. Use the buttons to control tracking.</p>
      <div class="box resizable" id="dynamic-box" data-keeptrack="height, width">
        <span>Resize me</span>
        <span class="box-info">
          --dynamic-box-height: <code class="val-dyn-h">…</code><br>
          --dynamic-box-width: <code class="val-dyn-w">…</code>
        </span>
      </div>
      <div class="button-row">
        <button id="btn-observe">Observe</button>
        <button id="btn-unobserve">Unobserve</button>
      </div>
    </section>

    <!-- ==============================
         11. Dynamic data-keeptrack attribute
         ============================== -->
    <section class="test-section">
      <h2>Dynamic attribute</h2>
      <p>Add/remove <code>data-keeptrack</code> dynamically.</p>
      <div class="box" id="attr-box">
        <span>Not tracked yet</span>
        <span class="box-info">--attr-box-height: <code class="val-attr-h">…</code></span>
      </div>
      <div class="button-row">
        <button id="btn-add-attr">Add data-keeptrack="height"</button>
        <button id="btn-remove-attr">Remove data-keeptrack</button>
      </div>
    </section>

    <!-- ==============================
         12. Destroy / Re-init
         ============================== -->
    <section class="test-section">
      <h2>Destroy / Re-init</h2>
      <div class="button-row">
        <button id="btn-destroy">Destroy</button>
        <button id="btn-reinit">Re-init</button>
        <button id="btn-recalculate">Recalculate</button>
      </div>
    </section>

    <!-- ==============================
         13. onChange log
         ============================== -->
    <section class="test-section">
      <h2>onChange log</h2>
      <p>Changes are logged in the floating panel (bottom-right).</p>
    </section>

    <!-- ==============================
         Anchor test
         ============================== -->
    <h2 id="section-anchors" class="section-heading">Anchor link tests</h2>

    <section class="test-section">
      <h2>Scroll-padding test</h2>
      <p>Click these links to jump to sections below. Each heading should be visible below the sticky header(s), not hidden behind them.</p>
      <p>This header uses <code>top: calc(var(--header-offset, 0px))</code> to verify calc/var resolution.</p>
      <nav class="anchor-nav">
        <a href="#anchor-alpha">Alpha</a>
        <a href="#anchor-beta">Beta</a>
        <a href="#anchor-gamma">Gamma</a>
        <a href="#anchor-delta">Delta</a>
        <a href="#anchor-epsilon">Epsilon</a>
      </nav>
    </section>

  <!-- Close subnav-container here so the sub-nav unsticks
       once we scroll past this point -->
  </div>

  <div class="unstick-notice">
    <p>The sub-nav should have unstuck above this point (its container ended). The header remains sticky. Scroll-padding now only accounts for the header height.</p>
  </div>

    <section class="test-section anchor-section">
      <h2 id="anchor-alpha">Alpha</h2>
      <p>This is the Alpha section. The heading should be visible below the sticky elements when navigated to via <a href="#anchor-alpha">#anchor-alpha</a>.</p>
      <div class="anchor-filler"></div>
    </section>

    <section class="test-section anchor-section">
      <h2 id="anchor-beta">Beta</h2>
      <p>This is the Beta section. Try clicking <a href="#section-basics">back to Basics</a> to scroll up, then <a href="#anchor-beta">#anchor-beta</a> again.</p>
      <div class="anchor-filler"></div>
    </section>

    <section class="test-section anchor-section">
      <h2 id="anchor-gamma">Gamma</h2>
      <p>This is the Gamma section. At this scroll depth, the sub-nav should have unstuck. Only the header's height contributes to scroll-padding.</p>
      <div class="anchor-filler"></div>
    </section>

    <section class="test-section anchor-section">
      <h2 id="anchor-delta">Delta</h2>
      <p>This is the Delta section. Try <a href="#anchor-alpha">jumping back to Alpha</a> — the sub-nav should re-stick as you scroll up into its container.</p>
      <div class="anchor-filler"></div>
    </section>

    <section class="test-section anchor-section">
      <h2 id="anchor-epsilon">Epsilon</h2>
      <p>This is the Epsilon section — the last anchor target. Try navigating to any section from the sub-nav: <a href="#section-basics">Basics</a>, <a href="#section-targets">Targets</a>, <a href="#section-features">Features</a>.</p>
      <div class="anchor-filler"></div>
    </section>

    <!-- Spacer to enable scrolling past the last section -->
    <div class="spacer"></div>

  </main>

  <div id="log" class="log-float">
    <div class="log-toolbar">
      <button id="log-clear-btn">Clear</button>
    </div>
    <div id="log-entries" class="log-entries"></div>
  </div>

  <script src="src/keepTrack.js"></script>
  <script>
    // ==============================
    // Initialize KeepTrack
    // ==============================

    const logEl = document.getElementById('log');
    const logEntries = document.getElementById('log-entries');
    const maxLogEntries = 50;

    function log(msg) {
      logEl.classList.add('is-visible');
      const entry = document.createElement('div');
      entry.className = 'log-entry';
      entry.textContent = msg;
      logEntries.append(entry);
      while (logEntries.children.length > maxLogEntries) {
        logEntries.removeChild(logEntries.firstChild);
      }
      logEntries.scrollTop = logEntries.scrollHeight;
    }

    document.getElementById('log-clear-btn').addEventListener('click', () => {
      logEntries.innerHTML = '';
      logEl.classList.remove('is-visible');
    });

    let tracker = new KeepTrack({
      scrollbarWidth: true,
      scrollbarHeight: true,
      poll: true,
      detectSticky: true,
      debounceTime: 150,
      onChange(el, prop, value) {
        const id = el.id || el.className.split(' ')[0];
        log(`${id} → ${prop}: ${value}`);
      }
    });

    // ==============================
    // Observe / Unobserve
    // ==============================

    const dynamicBox = document.getElementById('dynamic-box');
    // Start untracked — remove from KeepTrack's auto-detected list
    tracker.unobserve(dynamicBox);

    document.getElementById('btn-observe').addEventListener('click', () => {
      tracker.observe(dynamicBox);
      log('Observed #dynamic-box');
    });

    document.getElementById('btn-unobserve').addEventListener('click', () => {
      tracker.unobserve(dynamicBox);
      log('Unobserved #dynamic-box');
    });

    // ==============================
    // Dynamic attribute
    // ==============================

    const attrBox = document.getElementById('attr-box');

    document.getElementById('btn-add-attr').addEventListener('click', () => {
      attrBox.setAttribute('data-keeptrack', 'height');
      log('Added data-keeptrack="height" to #attr-box');
    });

    document.getElementById('btn-remove-attr').addEventListener('click', () => {
      attrBox.removeAttribute('data-keeptrack');
      log('Removed data-keeptrack from #attr-box');
    });

    // ==============================
    // Destroy / Re-init
    // ==============================

    document.getElementById('btn-destroy').addEventListener('click', () => {
      tracker.destroy();
      log('Destroyed KeepTrack');
    });

    document.getElementById('btn-reinit').addEventListener('click', () => {
      tracker.init({
        scrollbarWidth: true,
        scrollbarHeight: true,
        poll: true,
        detectSticky: true,
        debounceTime: 150,
        onChange(el, prop, value) {
          const id = el.id || el.className.split(' ')[0];
          log(`${id} → ${prop}: ${value}`);
        }
      });
      // Re-unobserve dynamic box so it starts untracked again
      tracker.unobserve(dynamicBox);
      log('Re-initialized KeepTrack');
    });

    document.getElementById('btn-recalculate').addEventListener('click', () => {
      tracker.recalculate();
      log('Recalculated');
    });

    // ==============================
    // Value display updater
    // ==============================

    function updateDisplayValues() {
      const root = document.documentElement;
      const rs = getComputedStyle(root);

      // Header
      setText('.val-header-height', rs.getPropertyValue('--site-header-height'));
      setText('.val-header-stuck', rs.getPropertyValue('--site-header-stuck'));

      // Sub-nav
      setText('.val-subnav-height', rs.getPropertyValue('--sub-nav-height'));
      setText('.val-subnav-stuck', rs.getPropertyValue('--sub-nav-stuck'));

      // Stuck indicators
      const header = document.getElementById('site-header');
      const stuckEl = header.querySelector('.stuck-indicator');
      setText(stuckEl, header.hasAttribute('data-keeptrack-stuck') ? 'Stuck!' : 'Not stuck');

      const subNav = document.getElementById('sub-nav');
      const subNavStuckEl = subNav.querySelector('.subnav-stuck-indicator');
      setText(subNavStuckEl, subNav.hasAttribute('data-keeptrack-stuck') ? 'Stuck!' : 'Not stuck');

      // Basic (no id — read from element inline style)
      const basicBox = document.querySelector('.box.resizable[data-keeptrack="height, width"]:not([id])');
      if (basicBox) {
        setText('.val-basic-height', basicBox.style.getPropertyValue('--height'));
        setText('.val-basic-width', basicBox.style.getPropertyValue('--width'));
      }

      // ID-based
      setText('.val-id-height', rs.getPropertyValue('--tracked-box-height'));
      setText('.val-dataid-height', rs.getPropertyValue('--alias-box-height'));

      // Parent numeric
      const gpEl = document.querySelector('.grandparent');
      if (gpEl) setText('.val-parent-num', gpEl.style.getPropertyValue('--height'));

      // Parent selector
      const wrapperEl = document.querySelector('.wrapper');
      if (wrapperEl) setText('.val-parent-sel', wrapperEl.style.getPropertyValue('--height'));

      // Target + id
      const layoutEl = document.querySelector('.layout');
      if (layoutEl) setText('.val-target-id', layoutEl.style.getPropertyValue('--my-sidebar-width'));

      // Multi
      const multiBox = document.querySelector('.box.multi');
      if (multiBox) {
        setText('.val-multi-h', multiBox.style.getPropertyValue('--height'));
        setText('.val-multi-w', multiBox.style.getPropertyValue('--width'));
        setText('.val-multi-pt', multiBox.style.getPropertyValue('--padding-top'));
        setText('.val-multi-br', multiBox.style.getPropertyValue('--border-radius'));
      }

      // Scrollbar
      setText('.val-scrollbar-w', rs.getPropertyValue('--scrollbar-width'));
      setText('.val-scrollbar-h', rs.getPropertyValue('--scrollbar-height'));

      // Poll
      const pollBox = document.querySelector('.poll-box');
      if (pollBox) setText('.val-poll-bg', pollBox.style.getPropertyValue('--background-color'));

      // Dynamic observe
      setText('.val-dyn-h', rs.getPropertyValue('--dynamic-box-height'));
      setText('.val-dyn-w', rs.getPropertyValue('--dynamic-box-width'));

      // Dynamic attribute
      setText('.val-attr-h', rs.getPropertyValue('--attr-box-height'));

      requestAnimationFrame(updateDisplayValues);
    }

    function setText(selectorOrEl, value) {
      const el = typeof selectorOrEl === 'string' ? document.querySelector(selectorOrEl) : selectorOrEl;
      if (!el) return;
      const text = value || '(none)';
      if (el.textContent !== text) el.textContent = text;
    }

    updateDisplayValues();
  </script>

</body>
</html>