595a3b13d8
The server-rendered SEO pages shared base.html.j2's nav but carried no JS, so
they lacked the °F/°C toggle and account/bell, and their temperatures were baked
as dual-unit strings that couldn't respond to a toggle.
- Load units.js + account.js + climate.js on base.html.j2, so every SEO page gets
the same header as the interactive pages (nav + °F/°C toggle + account + bell).
- Emit each temperature as <span class="temp" data-temp-f> (default °F text, real
for crawlers/no-JS); climate.js rewrites them to the active unit on load and on
toggle. Tint classes stay pinned to absolute °F. Drops the inline "(NN°C)".
- Make account.js base-aware: derive the app base from import.meta.url so its
api/v2 fetches and the alerts links resolve from deep /climate/{slug} URLs
instead of 404ing. Equivalent on the depth-1 interactive pages.
- Default the unit from the browser locale for first-time visitors (no stored
pref): en-US → °F, everyone else → °C. A stored choice always wins.
90 lines
4 KiB
JavaScript
90 lines
4 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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// First-time default: pick °F only for the countries that actually use it (the US
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// plus a handful of territories/nations), otherwise °C — read off the browser
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// locale's region subtag (en-US → F, de-DE → C). A stored choice always wins, so
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// this only affects visitors who've never toggled. Not persisted, so an unstored
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// visitor keeps re-deriving the same locale default until they pick one.
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const F_REGIONS = new Set(["US", "PR", "GU", "VI", "AS", "MP", "UM", "BS", "BZ", "KY", "PW", "FM", "MH", "LR"]);
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function defaultUnit() {
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const langs = (navigator.languages && navigator.languages.length)
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? navigator.languages : [navigator.language];
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for (const l of langs) {
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const m = /-([A-Za-z]{2})\b/.exec(l || "");
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if (m) return F_REGIONS.has(m[1].toUpperCase()) ? "F" : "C";
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}
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return "F"; // no region subtag to go on → keep the historical default
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}
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const _stored = localStorage.getItem(UNIT_KEY);
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let _unit = (_stored === "C" || _stored === "F") ? _stored : defaultUnit();
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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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// Lives inside the nav menu panel: display:contents keeps it inline top-right
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// on desktop; on phones it stacks inside the hamburger dropdown. Fall back to a
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// brand sibling if the panel isn't present.
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const panel = brand.querySelector(".nav-panel");
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if (panel) panel.appendChild(wrap);
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else brand.insertBefore(wrap, brand.querySelector(".view-nav"));
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syncUnitToggle(wrap);
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})();
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