www: add timezone list for convenience

Add a timezone list and dropdown, hackishly generated from the
IANA/Olson TZ database.

esp32/www/config.html

@@ -24,8 +24,10 @@
       <fieldset class="datetime">
 	<legend>Date and Time</legend>
 	<div>
-	  <label for="TZ">Timezone configuration:</label>
-	  <input type="text" id="TZ" name="TZ" />
+	  <label for="tz">Timezone configuration:</label>
+	  <select id="tzname" name="tzname" onchange="tzn(event,'tz')">
+	  </select>
+	  <input type="text" id="tz" name="TZ" oninput="tzt(event,'tzname')" />
 	</div>
 	<div>
 	  <label for="sntp.enabled">Synchronize time from network:</label>
@@ -42,6 +44,40 @@
       </fieldset>
       <button class="submit" type="submit" disabled>Update configuration</button>
     </form>
+    <script>
+      fetchconfig('tz.txt').then(map => {
+	  var elem = getelem('tzname');
+	  var grp = elem;
+	  map.set('',''); map.set('UTC','UTC0');
+	  var zones = Array.from(map.keys());
+	  zones = zones.filter(v => v && v != 'UTC').sort();
+	  zones.unshift('','UTC');
+	  for (const z of zones) {
+	      const zz = z.match(/^(?:(\S+?)\/)?(\S*)$/,z);
+	      if (!zz) { continue; }
+	      if (zz[1] && zz[1] != grp.label) {
+		  grp = document.createElement('OPTGROUP');
+		  grp.label = zz[1];
+		  grp.classList.add('tz.'+zz[1]);
+		  elem.append(grp);
+	      } else if (!zz[1]) {
+		  grp = elem;
+	      }
+	      var opt = document.createElement('OPTION');
+	      opt.value = z;
+	      opt.classList.add('tz.'+z.replaceAll('/','.'));
+	      opt.classList.add('tz.'+zz[2].replaceAll('/','.'));
+	      opt.label = zz[2].replaceAll('_',' ').replaceAll('/',': ');
+	      opt.dataset.tz = map.get(z);
+	      grp.append(opt);
+	  }
+      });
+      function tzn(e,p) {
+	  var tz = e.target.selectedOptions[0].dataset.tz;
+	  if (tz) { getelem(p).value = tz; }
+      }
+      function tzt(e,p) { getelem(p).value = ''; }
+    </script>
     <script>loadform('setconfig','sys/getconfig')</script>
     <script>translate()</script>
   </body>

esp32/www/max80.js

@@ -33,11 +33,10 @@ function initform(form,map) {
     form = getelem(form);
 
     for (var field of form.elements) {
-	if (field instanceof HTMLInputElement &&
+	if ((field instanceof HTMLInputElement ||
+	     field instanceof HTMLSelectElement) &&
 	    !field.classList.contains("noload")) {
-	    var val = map.get(field.name);
-	    if (val == undefined)
-		val = '';
+	    const val = map.get(field.name) || '';
 	    if (field.type == 'checkbox') {
 		const checked = !val.match(/^(0*|[fn].*|of.*)$/i);
 		field.checked = checked;

esp32/www/tz.txt

@@ -0,0 +1,256 @@
+Africa/Abidjan=GMT0
+Africa/Accra=GMT0
+Africa/Addis_Ababa=EAT-3
+Africa/Algiers=CET-1
+Africa/Asmara=EAT-3
+Africa/Bamako=GMT0
+Africa/Bangui=WAT-1
+Africa/Banjul=GMT0
+Africa/Bissau=GMT0
+Africa/Blantyre=CAT-2
+Africa/Brazzaville=WAT-1
+Africa/Bujumbura=CAT-2
+Africa/Cairo=EET-2
+Africa/Ceuta=CET-1CEST,M3.5.0,M10.5.0/3
+Africa/Conakry=GMT0
+Africa/Dakar=GMT0
+Africa/Dar_es_Salaam=EAT-3
+Africa/Djibouti=EAT-3
+Africa/Douala=WAT-1
+Africa/Freetown=GMT0
+Africa/Gaborone=CAT-2
+Africa/Harare=CAT-2
+Africa/Johannesburg=SAST-2
+Africa/Juba=CAT-2
+Africa/Kampala=EAT-3
+Africa/Khartoum=CAT-2
+Africa/Kigali=CAT-2
+Africa/Kinshasa=WAT-1
+Africa/Lagos=WAT-1
+Africa/Libreville=WAT-1
+Africa/Lome=GMT0
+Africa/Luanda=WAT-1
+Africa/Lubumbashi=CAT-2
+Africa/Lusaka=CAT-2
+Africa/Malabo=WAT-1
+Africa/Maputo=CAT-2
+Africa/Maseru=SAST-2
+Africa/Mbabane=SAST-2
+Africa/Mogadishu=EAT-3
+Africa/Monrovia=GMT0
+Africa/Nairobi=EAT-3
+Africa/Ndjamena=WAT-1
+Africa/Niamey=WAT-1
+Africa/Nouakchott=GMT0
+Africa/Ouagadougou=GMT0
+Africa/Porto-Novo=WAT-1
+Africa/Sao_Tome=GMT0
+Africa/Tripoli=EET-2
+Africa/Tunis=CET-1
+Africa/Windhoek=CAT-2
+America/Adak=HST10HDT,M3.2.0,M11.1.0
+America/Anchorage=AKST9AKDT,M3.2.0,M11.1.0
+America/Anguilla=AST4
+America/Antigua=AST4
+America/Aruba=AST4
+America/Atikokan=EST5
+America/Bahia_Banderas=CST6CDT,M4.1.0,M10.5.0
+America/Barbados=AST4
+America/Belize=CST6
+America/Blanc-Sablon=AST4
+America/Boise=MST7MDT,M3.2.0,M11.1.0
+America/Cambridge_Bay=MST7MDT,M3.2.0,M11.1.0
+America/Cancun=EST5
+America/Cayman=EST5
+America/Chicago=CST6CDT,M3.2.0,M11.1.0
+America/Chihuahua=MST7MDT,M4.1.0,M10.5.0
+America/Costa_Rica=CST6
+America/Creston=MST7
+America/Curacao=AST4
+America/Danmarkshavn=GMT0
+America/Dawson=MST7
+America/Dawson_Creek=MST7
+America/Denver=MST7MDT,M3.2.0,M11.1.0
+America/Detroit=EST5EDT,M3.2.0,M11.1.0
+America/Dominica=AST4
+America/Edmonton=MST7MDT,M3.2.0,M11.1.0
+America/El_Salvador=CST6
+America/Fort_Nelson=MST7
+America/Glace_Bay=AST4ADT,M3.2.0,M11.1.0
+America/Goose_Bay=AST4ADT,M3.2.0,M11.1.0
+America/Grand_Turk=EST5EDT,M3.2.0,M11.1.0
+America/Grenada=AST4
+America/Guadeloupe=AST4
+America/Guatemala=CST6
+America/Halifax=AST4ADT,M3.2.0,M11.1.0
+America/Havana=CST5CDT,M3.2.0/0,M11.1.0/1
+America/Hermosillo=MST7
+America/Indiana/Indianapolis=EST5EDT,M3.2.0,M11.1.0
+America/Indiana/Knox=CST6CDT,M3.2.0,M11.1.0
+America/Indiana/Marengo=EST5EDT,M3.2.0,M11.1.0
+America/Indiana/Petersburg=EST5EDT,M3.2.0,M11.1.0
+America/Indiana/Tell_City=CST6CDT,M3.2.0,M11.1.0
+America/Indiana/Vevay=EST5EDT,M3.2.0,M11.1.0
+America/Indiana/Vincennes=EST5EDT,M3.2.0,M11.1.0
+America/Indiana/Winamac=EST5EDT,M3.2.0,M11.1.0
+America/Inuvik=MST7MDT,M3.2.0,M11.1.0
+America/Iqaluit=EST5EDT,M3.2.0,M11.1.0
+America/Jamaica=EST5
+America/Juneau=AKST9AKDT,M3.2.0,M11.1.0
+America/Kentucky/Louisville=EST5EDT,M3.2.0,M11.1.0
+America/Kentucky/Monticello=EST5EDT,M3.2.0,M11.1.0
+America/Kralendijk=AST4
+America/Los_Angeles=PST8PDT,M3.2.0,M11.1.0
+America/Lower_Princes=AST4
+America/Managua=CST6
+America/Marigot=AST4
+America/Martinique=AST4
+America/Matamoros=CST6CDT,M3.2.0,M11.1.0
+America/Mazatlan=MST7MDT,M4.1.0,M10.5.0
+America/Menominee=CST6CDT,M3.2.0,M11.1.0
+America/Merida=CST6CDT,M4.1.0,M10.5.0
+America/Metlakatla=AKST9AKDT,M3.2.0,M11.1.0
+America/Mexico_City=CST6CDT,M4.1.0,M10.5.0
+America/Moncton=AST4ADT,M3.2.0,M11.1.0
+America/Monterrey=CST6CDT,M4.1.0,M10.5.0
+America/Montserrat=AST4
+America/Nassau=EST5EDT,M3.2.0,M11.1.0
+America/New_York=EST5EDT,M3.2.0,M11.1.0
+America/Nipigon=EST5EDT,M3.2.0,M11.1.0
+America/Nome=AKST9AKDT,M3.2.0,M11.1.0
+America/North_Dakota/Beulah=CST6CDT,M3.2.0,M11.1.0
+America/North_Dakota/Center=CST6CDT,M3.2.0,M11.1.0
+America/North_Dakota/New_Salem=CST6CDT,M3.2.0,M11.1.0
+America/Ojinaga=MST7MDT,M3.2.0,M11.1.0
+America/Panama=EST5
+America/Pangnirtung=EST5EDT,M3.2.0,M11.1.0
+America/Phoenix=MST7
+America/Port-au-Prince=EST5EDT,M3.2.0,M11.1.0
+America/Port_of_Spain=AST4
+America/Puerto_Rico=AST4
+America/Rainy_River=CST6CDT,M3.2.0,M11.1.0
+America/Rankin_Inlet=CST6CDT,M3.2.0,M11.1.0
+America/Regina=CST6
+America/Resolute=CST6CDT,M3.2.0,M11.1.0
+America/Santo_Domingo=AST4
+America/Sitka=AKST9AKDT,M3.2.0,M11.1.0
+America/St_Barthelemy=AST4
+America/St_Johns=NST3:30NDT,M3.2.0,M11.1.0
+America/St_Kitts=AST4
+America/St_Lucia=AST4
+America/St_Thomas=AST4
+America/St_Vincent=AST4
+America/Swift_Current=CST6
+America/Tegucigalpa=CST6
+America/Thule=AST4ADT,M3.2.0,M11.1.0
+America/Thunder_Bay=EST5EDT,M3.2.0,M11.1.0
+America/Tijuana=PST8PDT,M3.2.0,M11.1.0
+America/Toronto=EST5EDT,M3.2.0,M11.1.0
+America/Tortola=AST4
+America/Vancouver=PST8PDT,M3.2.0,M11.1.0
+America/Whitehorse=MST7
+America/Winnipeg=CST6CDT,M3.2.0,M11.1.0
+America/Yakutat=AKST9AKDT,M3.2.0,M11.1.0
+America/Yellowknife=MST7MDT,M3.2.0,M11.1.0
+Antarctica/Macquarie=AEST-10AEDT,M10.1.0,M4.1.0/3
+Antarctica/McMurdo=NZST-12NZDT,M9.5.0,M4.1.0/3
+Arctic/Longyearbyen=CET-1CEST,M3.5.0,M10.5.0/3
+Asia/Amman=EET-2EEST,M2.5.4/24,M10.5.5/1
+Asia/Beirut=EET-2EEST,M3.5.0/0,M10.5.0/0
+Asia/Damascus=EET-2EEST,M3.5.5/0,M10.5.5/0
+Asia/Famagusta=EET-2EEST,M3.5.0/3,M10.5.0/4
+Asia/Gaza=EET-2EEST,M3.4.4/72,M10.4.4/25
+Asia/Hebron=EET-2EEST,M3.4.4/72,M10.4.4/25
+Asia/Hong_Kong=HKT-8
+Asia/Jakarta=WIB-7
+Asia/Jayapura=WIT-9
+Asia/Jerusalem=IST-2IDT,M3.4.4/26,M10.5.0
+Asia/Karachi=PKT-5
+Asia/Kolkata=IST-5:30
+Asia/Macau=CST-8
+Asia/Makassar=WITA-8
+Asia/Manila=PST-8
+Asia/Nicosia=EET-2EEST,M3.5.0/3,M10.5.0/4
+Asia/Pontianak=WIB-7
+Asia/Pyongyang=KST-9
+Asia/Seoul=KST-9
+Asia/Shanghai=CST-8
+Asia/Taipei=CST-8
+Asia/Tokyo=JST-9
+Atlantic/Bermuda=AST4ADT,M3.2.0,M11.1.0
+Atlantic/Canary=WET0WEST,M3.5.0/1,M10.5.0
+Atlantic/Faroe=WET0WEST,M3.5.0/1,M10.5.0
+Atlantic/Madeira=WET0WEST,M3.5.0/1,M10.5.0
+Atlantic/Reykjavik=GMT0
+Atlantic/St_Helena=GMT0
+Australia/Adelaide=ACST-9:30ACDT,M10.1.0,M4.1.0/3
+Australia/Brisbane=AEST-10
+Australia/Broken_Hill=ACST-9:30ACDT,M10.1.0,M4.1.0/3
+Australia/Darwin=ACST-9:30
+Australia/Hobart=AEST-10AEDT,M10.1.0,M4.1.0/3
+Australia/Lindeman=AEST-10
+Australia/Melbourne=AEST-10AEDT,M10.1.0,M4.1.0/3
+Australia/Perth=AWST-8
+Australia/Sydney=AEST-10AEDT,M10.1.0,M4.1.0/3
+Europe/Amsterdam=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Andorra=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Athens=EET-2EEST,M3.5.0/3,M10.5.0/4
+Europe/Belgrade=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Berlin=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Bratislava=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Brussels=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Bucharest=EET-2EEST,M3.5.0/3,M10.5.0/4
+Europe/Budapest=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Busingen=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Chisinau=EET-2EEST,M3.5.0,M10.5.0/3
+Europe/Copenhagen=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Dublin=IST-1GMT0,M10.5.0,M3.5.0/1
+Europe/Gibraltar=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Guernsey=GMT0BST,M3.5.0/1,M10.5.0
+Europe/Helsinki=EET-2EEST,M3.5.0/3,M10.5.0/4
+Europe/Isle_of_Man=GMT0BST,M3.5.0/1,M10.5.0
+Europe/Jersey=GMT0BST,M3.5.0/1,M10.5.0
+Europe/Kaliningrad=EET-2
+Europe/Kyiv=EET-2EEST,M3.5.0/3,M10.5.0/4
+Europe/Lisbon=WET0WEST,M3.5.0/1,M10.5.0
+Europe/Ljubljana=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/London=GMT0BST,M3.5.0/1,M10.5.0
+Europe/Luxembourg=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Madrid=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Malta=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Mariehamn=EET-2EEST,M3.5.0/3,M10.5.0/4
+Europe/Monaco=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Moscow=MSK-3
+Europe/Nicosia=EET-2EEST,M3.5.0/3,M10.5.0/4
+Europe/Oslo=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Paris=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Podgorica=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Prague=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Riga=EET-2EEST,M3.5.0/3,M10.5.0/4
+Europe/Rome=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/San_Marino=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Sarajevo=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Simferopol=MSK-3
+Europe/Skopje=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Sofia=EET-2EEST,M3.5.0/3,M10.5.0/4
+Europe/Stockholm=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Tallinn=EET-2EEST,M3.5.0/3,M10.5.0/4
+Europe/Tirane=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Uzhgorod=EET-2EEST,M3.5.0/3,M10.5.0/4
+Europe/Vaduz=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Vatican=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Vienna=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Vilnius=EET-2EEST,M3.5.0/3,M10.5.0/4
+Europe/Warsaw=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Zagreb=CET-1CEST,M3.5.0,M10.5.0/3
+Europe/Zaporozhye=EET-2EEST,M3.5.0/3,M10.5.0/4
+Europe/Zurich=CET-1CEST,M3.5.0,M10.5.0/3
+Indian/Antananarivo=EAT-3
+Indian/Comoro=EAT-3
+Indian/Mayotte=EAT-3
+Pacific/Auckland=NZST-12NZDT,M9.5.0,M4.1.0/3
+Pacific/Guam=ChST-10
+Pacific/Honolulu=HST10
+Pacific/Midway=SST11
+Pacific/Pago_Pago=SST11
+Pacific/Saipan=ChST-10