gistfile1.js

$(".ui-autocomplete-city").autocomplete({
	source: function(request, response){
		$.ajax({
			url: "http://ws.geonames.org/searchJSON",
			dataType: "jsonp",
			data: {
				featureClass: "P",
				style: "full",
				maxRows: 12,
				name_startsWith: request.term,
				username: 'netcore',
				country: 'lv'
			},
			success: function(data) {
				response($.map(data.geonames, function(item) {
					return {
						label: item.name + ((item.adminName1 && item.adminName1 != item.name) ? ", " + item.adminName1 : "") + ", " + item.countryName,
						value: item.name + ((item.adminName1 && item.adminName1 != item.name) ? ", " + item.adminName1 : "")
					}
				}));
			}
		});
	},
	minLength: 2,
	select: function(event, ui) {
		console.log(ui.item ?
			"Selected: " + ui.item.label :
			"Nothing selected, input was " + this.value);
	}
});