29302624a7
compare.js never imported units.js, so the header unit toggle was never built on the compare page and every temperature was stuck in °F. Import units.js (which builds the toggle) and route the comfort target, comfort band, and the colder/warmer/typical-miss figures through the unit formatters, re-rendering on unit change. State stays in °F (the API's unit); only the displayed numbers convert. Add fmtDelta for degree *differences* (band, average miss), which scale by 5/9 without the 32° offset that absolute temperatures use.
69 lines
2.8 KiB
JavaScript
69 lines
2.8 KiB
JavaScript
// Temperature units — the shared °C/°F toggle and unit-aware formatting.
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// The API always speaks Fahrenheit; the unit is a pure display concern. Pages
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// format temps through `fmtTemp`/`toUnit` and re-render on `onUnitChange`, so the
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// stored/plotted values stay in °F and only the numbers shown flip.
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const UNIT_KEY = "thermograph:unit";
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let _unit = (localStorage.getItem(UNIT_KEY) === "C") ? "C" : "F";
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const _unitCbs = [];
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export function getUnit() { return _unit; }
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// A Fahrenheit value as a number in the active unit.
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export function toUnit(vF) { return _unit === "C" ? (vF - 32) * 5 / 9 : vF; }
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// A Fahrenheit value formatted as a rounded temperature in the active unit.
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// `withLetter` appends the C/F letter (off by default — the nav toggle shows it).
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export function fmtTemp(vF, withLetter) {
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if (vF == null || isNaN(vF)) return "—";
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return `${Math.round(toUnit(vF))}°${withLetter ? _unit : ""}`;
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}
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// A Fahrenheit-degree *difference* (a span or tolerance, not an absolute
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// reading) formatted in the active unit. Differences scale by 5/9 with no 32°
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// offset, so they can't go through toUnit/fmtTemp.
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export function fmtDelta(dF, withLetter) {
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if (dF == null || isNaN(dF)) return "—";
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const d = _unit === "C" ? dF * 5 / 9 : dF;
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return `${Math.round(d)}°${withLetter ? _unit : ""}`;
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}
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export function onUnitChange(cb) { _unitCbs.push(cb); }
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export function setUnit(u) {
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const nu = (u === "C") ? "C" : "F";
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if (nu === _unit) return;
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_unit = nu;
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try { localStorage.setItem(UNIT_KEY, _unit); } catch (e) {}
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document.querySelectorAll(".unit-toggle").forEach(syncUnitToggle);
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_unitCbs.forEach((cb) => { try { cb(_unit); } catch (e) {} });
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}
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function syncUnitToggle(wrap) {
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wrap.querySelectorAll("button[data-unit]").forEach((b) => {
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const on = b.dataset.unit === _unit;
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b.classList.toggle("active", on);
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b.setAttribute("aria-pressed", on ? "true" : "false");
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});
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}
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// Drop a segmented °F/°C control into the header's top-right, ahead of the view
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// switcher. A page opts out with data-no-unit-toggle on <body>.
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(function buildUnitToggle() {
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const brand = document.querySelector(".brand");
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if (!brand || brand.querySelector(".unit-toggle")) return;
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if (document.body.dataset.noUnitToggle != null) return;
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const wrap = document.createElement("div");
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wrap.className = "unit-toggle";
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wrap.setAttribute("role", "group");
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wrap.setAttribute("aria-label", "Temperature units");
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wrap.innerHTML = '<button type="button" data-unit="F">°F</button>'
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+ '<button type="button" data-unit="C">°C</button>';
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wrap.addEventListener("click", (e) => {
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const b = e.target.closest("button[data-unit]");
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if (b) setUnit(b.dataset.unit);
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});
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const nav = brand.querySelector(".view-nav");
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brand.insertBefore(wrap, nav); // sits just left of the view tabs (top-right)
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syncUnitToggle(wrap);
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})();
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