67 lines
2.5 KiB
JavaScript
67 lines
2.5 KiB
JavaScript
(function ($) {
|
|
|
|
/**
|
|
* Set the client's system time zone as default values of form fields.
|
|
*/
|
|
Drupal.behaviors.setTimezone = {
|
|
attach: function (context, settings) {
|
|
$('select.timezone-detect', context).once('timezone', function () {
|
|
var dateString = Date();
|
|
// In some client environments, date strings include a time zone
|
|
// abbreviation, between 3 and 5 letters enclosed in parentheses,
|
|
// which can be interpreted by PHP.
|
|
var matches = dateString.match(/\(([A-Z]{3,5})\)/);
|
|
var abbreviation = matches ? matches[1] : 0;
|
|
|
|
// For all other client environments, the abbreviation is set to "0"
|
|
// and the current offset from UTC and daylight saving time status are
|
|
// used to guess the time zone.
|
|
var dateNow = new Date();
|
|
var offsetNow = dateNow.getTimezoneOffset() * -60;
|
|
|
|
// Use January 1 and July 1 as test dates for determining daylight
|
|
// saving time status by comparing their offsets.
|
|
var dateJan = new Date(dateNow.getFullYear(), 0, 1, 12, 0, 0, 0);
|
|
var dateJul = new Date(dateNow.getFullYear(), 6, 1, 12, 0, 0, 0);
|
|
var offsetJan = dateJan.getTimezoneOffset() * -60;
|
|
var offsetJul = dateJul.getTimezoneOffset() * -60;
|
|
|
|
var isDaylightSavingTime;
|
|
// If the offset from UTC is identical on January 1 and July 1,
|
|
// assume daylight saving time is not used in this time zone.
|
|
if (offsetJan == offsetJul) {
|
|
isDaylightSavingTime = '';
|
|
}
|
|
// If the maximum annual offset is equivalent to the current offset,
|
|
// assume daylight saving time is in effect.
|
|
else if (Math.max(offsetJan, offsetJul) == offsetNow) {
|
|
isDaylightSavingTime = 1;
|
|
}
|
|
// Otherwise, assume daylight saving time is not in effect.
|
|
else {
|
|
isDaylightSavingTime = 0;
|
|
}
|
|
|
|
// Submit request to the system/timezone callback and set the form field
|
|
// to the response time zone. The client date is passed to the callback
|
|
// for debugging purposes. Submit a synchronous request to avoid database
|
|
// errors associated with concurrent requests during install.
|
|
var path = 'system/timezone/' + abbreviation + '/' + offsetNow + '/' + isDaylightSavingTime;
|
|
var element = this;
|
|
$.ajax({
|
|
async: false,
|
|
url: settings.basePath,
|
|
data: { q: path, date: dateString },
|
|
dataType: 'json',
|
|
success: function (data) {
|
|
if (data) {
|
|
$(element).val(data);
|
|
}
|
|
}
|
|
});
|
|
});
|
|
}
|
|
};
|
|
|
|
})(jQuery);
|