import {MomentTimezone} from 'app/client/lib/imports'; import {ACIndexImpl} from 'app/client/lib/ACIndex'; import {ACSelectItem, buildACSelect} from 'app/client/lib/ACSelect'; import {testId} from "app/client/ui2018/cssVars"; import {nativeCompare} from 'app/common/gutil'; import {IDisposableOwner, Observable} from 'grainjs'; /** * Returns the ordered list of offsets for names at time timestamp. See timezoneOptions for details * on the sorting order. */ // exported for testing export function timezoneOptionsImpl( timestamp: number, names: string[], moment: MomentTimezone ): ACSelectItem[] { // What we want is moment(timestamp) but the dynamic import with our compiling settings produces // "moment is not a function". The following is equivalent, and easier than fixing import setup. const m = moment.unix(timestamp / 1000); const options = names.map((value) => ({ cleanText: value.toLowerCase().trim(), value, label: `(GMT${m.tz(value).format('Z')}) ${value}`, // A quick test reveal that it is a bit more efficient (~0.02ms) to get the offset using // `moment.tz.Zone#parse` than creating a Moment instance for each zone and then getting the // offset with `moment#utcOffset`. offset: -moment.tz.zone(value)!.parse(timestamp) })); options.sort((a, b) => nativeCompare(a.offset, b.offset) || nativeCompare(a.value, b.value)); return options; } /** * Returns the array of IOptionFull expected by `select` to create the list of timezones * options. The returned list is sorted based on the current offset (GMT-11:00 before GMT-10:00), * and then on alphabetical order of the name. */ function timezoneOptions(moment: MomentTimezone): ACSelectItem[] { return timezoneOptionsImpl(Date.now(), moment.tz.names(), moment); } /** * Creates a textbox with an autocomplete dropdown to select a time zone. * Usage: dom.create(buildTZAutocomplete, momentModule, valueObs, saveCallback) */ export function buildTZAutocomplete( owner: IDisposableOwner, moment: MomentTimezone, valueObs: Observable, save: (value: string) => Promise|void ) { // Set a large maxResults, since it's sometimes nice to see all supported timezones (there are // fewer than 1000 in practice). const acIndex = new ACIndexImpl(timezoneOptions(moment), 1000, true); // Only save valid time zones. If there is no selected item, we'll auto-select and save only // when there is a good match. const saveTZ = (value: string, item: ACSelectItem|undefined) => { if (!item) { const results = acIndex.search(value); if (results.selectIndex >= 0 && results.items.length > 0) { item = results.items[results.selectIndex]; value = item.value; } } if (!item) { throw new Error("Invalid time zone"); } if (value !== valueObs.get()) { return save(value); } }; return buildACSelect(owner, {acIndex, valueObs, save: saveTZ}, testId("tz-autocomplete") ); }