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const defaultTimezone = { name: 'UTC', offset: 0 };
const defaults = {
$inputEl: null,
$dropdownEl: null,
onSelectTimezone: null,
displayFormat: item => item.name,
};
export const formatUtcOffset = offset => {
const parsed = parseInt(offset, 10);
if (Number.isNaN(parsed) || parsed === 0) {
return `0`;
}
const prefix = offset > 0 ? '+' : '-';
return `${prefix} ${Math.abs(offset / 3600)}`;
};
export const formatTimezone = item => `[UTC ${formatUtcOffset(item.offset)}] ${item.name}`;
export const findTimezoneByIdentifier = (tzList = [], identifier = null) => {
if (tzList && tzList.length && identifier && identifier.length) {
return tzList.find(tz => tz.identifier === identifier) || null;
}
return null;
};
export default class TimezoneDropdown {
constructor({ $dropdownEl, $inputEl, onSelectTimezone, displayFormat } = defaults) {
this.$dropdown = $dropdownEl;
this.$dropdownToggle = this.$dropdown.find('.dropdown-toggle-text');
this.$input = $inputEl;
this.timezoneData = this.$dropdown.data('data');
this.onSelectTimezone = onSelectTimezone;
this.displayFormat = displayFormat || defaults.displayFormat;
this.initialTimezone =
findTimezoneByIdentifier(this.timezoneData, this.$input.val()) || defaultTimezone;
this.initDefaultTimezone();
this.initDropdown();
}
initDropdown() {
this.$dropdown.glDropdown({
data: this.timezoneData,
filterable: true,
selectable: true,
toggleLabel: this.displayFormat,
search: {
fields: ['name'],
},
clicked: cfg => this.updateInputValue(cfg),
text: item => formatTimezone(item),
});
this.setDropdownToggle(this.displayFormat(this.initialTimezone));
}
initDefaultTimezone() {
if (!this.$input.val()) {
this.$input.val(defaultTimezone.name);
}
}
setDropdownToggle(dropdownText) {
this.$dropdownToggle.text(dropdownText);
}
updateInputValue({ selectedObj, e }) {
e.preventDefault();
this.$input.val(selectedObj.identifier);
if (this.onSelectTimezone) {
this.onSelectTimezone({ selectedObj, e });
}
}
}
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