/*!
jQuery.timezonecombobox - Timezone ComboBox for jQuery
jQuery plugin for allowing the user to visually determine the offset of its local time (in seconds) relative to UTC.
uses:
- jquery
- jquery.timers
example:
return with submit form:
'timezone_offset' if jQuery object contains one element; otherwise 'id_timezone_offset'
options:
refreshTime - refresh time, milliseconds (default: 1s)
isHidden - hide widget
\brief Computes timezone offset (seconds)
\licence http://www.gnu.org/licenses/lgpl-3.0.txt
\author manifest
*/
(function($) {
var defaults = {
refreshTime: 60000,
isHidden: false
};
$.fn.timezoneComboBox = function(opt) {
var options = $.extend({}, defaults, opt);
var length = $(this).length;
if(length > 1)
var idAsPrefix_ = true;
else
var idAsPrefix_ = false;
this.each(function(element) {
if(this.id)
var id_ = this.id;
else
var id_ = 'timezoneComboBox';
var privateElement = document.getElementById(id_internal());
if(!privateElement)
$(id_external_full()).html(timezoneComboBoxHtml());
$().everyTime(options.refreshTime, function() {
updateTimezoneComboBox();
});
return this;
function id_external_full() { return '#' + id_; }
function id_internal_full() { return '#' + id_internal(); }
function id_internal() { return id_ + 'Private'; }
function updateTimezoneComboBox()
{
var index = document.getElementById(id_internal()).selectedIndex;
$(id_internal_full()).replaceWith(timezoneComboBoxHtml(index));
}
function timezoneComboBoxHtml(selectedIndex)
{
function addMilliseconds(time, ms)
{
return time.setMilliseconds(time.getMilliseconds() + ms);
}
function optionTimeFormat(time)
{
var minutes = time.getUTCMinutes();
if(minutes < 10)
minutes = '0' + minutes;
return time.getUTCHours() + ':' + minutes;
}
function optionText(time, zone, sign)
{
return optionTimeFormat(time) + ' (UTC '+ sign + optionTimeFormat(zone) + ')';
}
function option(value, text, isSelected)
{
isSelected = isSelected?'selected':'';
return '';
}
function name()
{
var value = 'timezone_offset';
if(idAsPrefix_ == false)
return value;
else
return id_ + '_' + value;
}
function expectedOffset()
{
var d = new Date();
return -d.getTimezoneOffset()*60;
}
function formHidden()
{
return '';
}
function formComboBox()
{
var index = 0;
var h12 = 12*60*60*1000;
var m30sec = 30*60;
var m30 = m30sec*1000;
var zone = new Date(h12 + m30);
var tmp = new Date();
var utc = tmp.valueOf();
var end = utc.valueOf() + h12;
var offset = -m30sec * 24;
addMilliseconds(tmp, -(h12 + m30));
if(!selectedIndex)
selectedIndex = 24 + parseInt(expectedOffset()/m30*1000);
form = '';
return form;
}
if(options.isHidden)
return formHidden();
else
return formComboBox();
}
});
};
})(jQuery);