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Restore US Hazard/severe weather behavior
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mrkmntal 2026-04-09 22:13:59 -04:00
commit 952872ab92
3 changed files with 55 additions and 15 deletions
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21
server/scripts/modules/hazards.mjs
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@ -18,6 +18,8 @@ const hazardModifiers = {
'Severe Thunderstorm Warning': 1,
};
const getAlertSignature = (alerts = []) => alerts.map((alert) => alert.id).sort().join('|');
class Hazards extends WeatherDisplay {
constructor(navId, elemId, defaultActive) {
// special height and width for scrolling
@ -34,6 +36,7 @@ class Hazards extends WeatherDisplay {
// take note of the already-shown alert ids
this.viewedAlerts = new Set();
this.viewedGetCount = 0;
this.alertSignature = '';
// cache for scroll calculations
// This cache is essential because baseCountChange() is called 25 times per second (every 40ms)
@ -52,7 +55,7 @@ class Hazards extends WeatherDisplay {
async getData(weatherParameters, refresh) {
// super checks for enabled
const superResult = super.getData(weatherParameters, refresh);
if (!this.weatherParameters?.supportsNoaaDisplays) {
if (!this.weatherParameters?.supportsNoaaAlerts) {
this.data = [];
this.timing.totalScreens = 0;
this.getDataCallback();
@ -75,6 +78,7 @@ class Hazards extends WeatherDisplay {
}
try {
const previousSignature = this.alertSignature;
// get the forecast using centralized safe handling
const url = new URL('https://api.weather.gov/alerts/active');
url.searchParams.append('point', `${this.weatherParameters.latitude},${this.weatherParameters.longitude}`);
@ -94,6 +98,14 @@ class Hazards extends WeatherDisplay {
const filteredAlerts = sortedAlerts.filter((hazard) => hazard.properties.severity !== 'Unknown' && (!hasImmediate || (hazard.properties.urgency === 'Immediate')));
this.data = filteredAlerts;
}
this.alertSignature = getAlertSignature(this.data);
const alertsChanged = previousSignature !== this.alertSignature;
if (alertsChanged) {
this.viewedAlerts.clear();
if (this.data.length > 0) {
postMessage({ type: 'current-weather-scroll', method: 'reload' });
}
}
// every 10 times through the get process (10 minutes), reset the viewed messages
if (this.viewedGetCount >= 10) {
@ -137,10 +149,11 @@ class Hazards extends WeatherDisplay {
const list = this.elem.querySelector('.hazard-lines');
list.innerHTML = '';
// filter viewed alerts
// Prefer new alerts, but keep active alerts visible even after they've been viewed once.
const unViewed = this.data.filter((data) => !this.viewedAlerts.has(data.id));
const alertsToDisplay = unViewed.length > 0 ? unViewed : this.data;
const lines = unViewed.map((data) => {
const lines = alertsToDisplay.map((data) => {
const fillValues = {};
const description = data.properties.description
.replaceAll('\n\n', '<br/><br/>')
@ -230,8 +243,6 @@ class Hazards extends WeatherDisplay {
const superValue = super.screenIndexFromBaseCount();
// false is returned when we reach the end of the scroll
if (superValue === false) {
// set total screens to zero to take this out of the rotation
this.timing.totalScreens = 0;
// note the ids shown
this?.data?.forEach((alert) => this.viewedAlerts.add(alert.id));
}