fix: track compiled RCL parallax JS for MapStaticAssets deployment
DeepDrftShared.Client's wwwroot/js/ was gitignored, so the TS-compiled parallax.js was absent at build-time manifest generation. MapStaticAssets serves _content/ exclusively from the build manifest, so the file was missing from the publish output — requests fell through to the Blazor HTML handler, producing a text/html MIME-type error in the browser. DeepDrftPublic audio JS is unaffected because UseStaticFiles() serves that startup project's physical wwwroot/ directly, bypassing the manifest. The RCL has no such bypass, so its compiled JS must be present at manifest-generation time, which requires tracking it in git.
This commit is contained in:
daniel-c-harvey
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/**
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* parallax - scroll-driven background-position panning for ParallaxImage.
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*
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* Single Responsibility: own the parallax math and scroll/observer lifecycle.
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* Blazor owns the component lifecycle and calls register/unregister. When the
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* IntersectionObserver fires and JS attaches the scroll listener, this module
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* sets data-parallax-active and immediately primes background-position-y —
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* atomically cancelling the pre-WASM CSS animation and writing the correct
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* position in the same turn, so there is no flash at the handoff.
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*/
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const handles = new Map();
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let _handleCounter = 0;
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const reducedMotion = () => window.matchMedia('(prefers-reduced-motion: reduce)').matches;
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function clamp(value, min, max) {
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return Math.max(min, Math.min(max, value));
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}
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function applyParallax(handle) {
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const { element, options } = handle;
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const rect = element.getBoundingClientRect();
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const viewportH = window.innerHeight;
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let progress = options.invertDirection
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? rect.top / viewportH
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: 1 - rect.top / viewportH;
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progress = clamp(progress, 0, 1);
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const pos = progress * clamp(options.speed, 0, 1) * 100;
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// Write background-position-y on each layer directly — the same property the
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// pre-WASM CSS animation drives (now cancelled via data-parallax-active).
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const layers = element.querySelectorAll(':scope > .layer');
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for (const layer of layers) {
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layer.style.backgroundPositionY = `${pos}%`;
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}
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}
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function attachScrollListener(handle) {
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if (handle.scrollListener || reducedMotion())
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return;
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const listener = () => {
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if (handle.rafId !== null)
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return;
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handle.rafId = requestAnimationFrame(() => {
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handle.rafId = null;
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applyParallax(handle);
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});
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};
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handle.scrollListener = listener;
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window.addEventListener('scroll', listener, { passive: true });
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// Cancel CSS animation and prime position atomically — no gap where neither drives.
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handle.element.setAttribute('data-parallax-active', '');
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applyParallax(handle);
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}
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function detachScrollListener(handle) {
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if (handle.scrollListener) {
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window.removeEventListener('scroll', handle.scrollListener);
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handle.scrollListener = null;
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}
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if (handle.rafId !== null) {
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cancelAnimationFrame(handle.rafId);
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handle.rafId = null;
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}
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}
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function setupAutoHeight(handle) {
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if (!handle.options.heightFraction || !handle.options.image1)
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return;
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const fraction = handle.options.heightFraction;
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const element = handle.element;
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const applyHeight = (naturalW, naturalH) => {
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const containerW = element.offsetWidth;
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if (containerW === 0 || naturalW === 0)
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return;
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const h = Math.round(containerW * (naturalH / naturalW) * fraction);
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element.style.setProperty('--window-height', `${h}px`);
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};
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const probe = new Image();
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probe.onload = () => {
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const nw = probe.naturalWidth;
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const nh = probe.naturalHeight;
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applyHeight(nw, nh);
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// Watch container width changes (orientation, responsive layout, etc.)
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handle.resizeObserver = new ResizeObserver(() => {
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applyHeight(nw, nh);
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});
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handle.resizeObserver.observe(element);
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};
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probe.src = handle.options.image1;
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}
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export function register(element, options) {
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const id = `parallax-${++_handleCounter}`;
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const realObserver = new IntersectionObserver((entries) => {
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for (const entry of entries) {
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if (entry.isIntersecting) {
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attachScrollListener(handle);
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}
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else {
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detachScrollListener(handle);
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}
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}
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});
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const handle = {
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element,
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options: { ...options, speed: clamp(options.speed, 0, 1) },
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observer: realObserver,
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resizeObserver: null,
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scrollListener: null,
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rafId: null,
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};
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handle.observer.observe(element);
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handles.set(id, handle);
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setupAutoHeight(handle);
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// Prime position synchronously so enhanced navigation and WASM handoff have
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// zero-frame gap. The init script covers cold page load; this covers nav.
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// Skip under reduced motion — parallax.ts never drives position then.
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if (!reducedMotion()) {
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element.setAttribute('data-parallax-active', '');
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applyParallax(handle);
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}
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return id;
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}
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export function unregister(handleId) {
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const handle = handles.get(handleId);
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if (!handle)
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return;
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detachScrollListener(handle);
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handle.element.removeAttribute('data-parallax-active');
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handle.observer.disconnect();
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handle.resizeObserver?.disconnect();
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handles.delete(handleId);
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}
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//# sourceMappingURL=/js/parallax/parallax.js.map
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@@ -0,0 +1 @@
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