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window.onload = function () {
var continent = document.getElementById('continent');
var city = document.getElementById('city');
if (continent != null && city != null) {
continent.addEventListener('change', function(event) {
hideTimezoneCities(city, continent.options[continent.selectedIndex].value, true);
});
hideTimezoneCities(city, continent.options[continent.selectedIndex].value, false);
}
};
/**
* Add the class 'hidden' to city options not attached to the current selected continent.
*
* @param cities List of <option> elements
* @param currentContinent Current selected continent
* @param reset Set to true to reset the selected value
*/
function hideTimezoneCities(cities, currentContinent, reset = false) {
var first = true;
[].forEach.call(cities, function(option) {
if (option.getAttribute('data-continent') != currentContinent) {
option.className = 'hidden';
} else {
option.className = '';
if (reset === true && first === true) {
option.setAttribute('selected', 'selected');
first = false;
}
}
});
}
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