tets.js

// get available dictionary names and add them to select element
function getUserDictionaryFilenames() {
    var serviceURL = "/api/Dictionary/UserDictionaryFilenames/";

    $.ajax({
        type: "GET",
        url: serviceURL,
        contentType: 'application/json',
        success: successFunc,
        error: errorFunc
    });

    function successFunc(data, status) {
        data.forEach(function (item) {
            // append the options
            $("#availableDictionaries").append("<option>" + item + "</option>");
        });
    }

    function errorFunc() {
        console.log("error");
    }
}