Using a select2 dropdown and ajax call to a GIS server

gisstreetnamelookup.js

$("#GisStreetName.select2").select2({
	placeholder: "Select...",
	minimumInputLength: 2,
	allowClear: true,
	autoClear: false,
	initSelection: function (element, callback) {
		var elementText = element.val();
		data = { id: elementText, text: elementText };
		callback(data);
	},
	ajax: {  /*Note: Your url will difer!*/
		quietMillis: 100,
		url: 'http://gisdata.<serversite>.net/public/rest/services/A_POL_Basemap/MapServer/15/query?' +
			 'returnDistinctValues=true&outFields=PREFIX%2C+NAME%2C+TYPE_%2C+DIRECTION%2C&returnGeometry=false' +
			 '&orderByFields=NAME%2C+PREFIX%2C+TYPE_%2C+DIRECTION&f=json',  
		dataType: 'jsonp', /*JSONP required to prevent XMLHttpRequest cannot load "No 'Access-Control-Allow-Origin' error */
		data: function (term) {
			term = "" + term;
			return 'where=NAME+LIKE+%27%25' + term.toUpperCase() + '%25%27';
		},

		results: function (data) {
			return { results: transformGisOutputToSelect2Format(data) };
		},
		formatResult: function (item) {
			var elementText = item.val();
			data = { id: elementText, text: elementText };
			callback(data);
		},
		formatSelection: function (item) {
			var elementText = item.val();
			data = { id: elementText, text: elementText };
			callback(data);
		}
	}
});

function transformGisOutputToSelect2Format(data) {
	var len = data.features.length, newJson = { data: [] }, i, lastStreet;

	newJson.data.push({
		id: "[NEW STREET--SEE COMMENTS]",
		text: "[NEW STREET--SEE COMMENTS]"
	})

    for (i = 0; i < len; i += 1) {
        var fullStreetName = GetStreetName(data.features[i].attributes);
        
        if (fullStreetName !== lastStreet) {//due to sorted list, able to remove duplicates
            newJson.data.push({
                id: fullStreetName,
                text: fullStreetName
            });
        }

		lastStreet = fullStreetName;
	}

	return newJson.data;
}

function GetStreetName(attributes) {
	var fullStreetName = "";

    if (attributes.PREFIX !== null) { fullStreetName += attributes.PREFIX + ' '; }
    if (attributes.NAME !== null) { fullStreetName += attributes.NAME + ' '; }
    if (attributes.TYPE_ !== null) { fullStreetName += attributes.TYPE_; }

    if (attributes.DIRECTION !== null) { fullStreetName += ' ' + attributes.DIRECTION; }

	return fullStreetName;
}