test.js

// load a specific user dictionary
function loadUserDictionary() {

    // call Web API endpoint to retrieve the dictionary
    var serviceURL = "/api/Dictionary/LoadUserDictionary?filename="
        + $("#availableDictionaries").val();

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

    function successFunc(data, status) {
        // enable spell checking
        TXTextControl.isSpellCheckingEnabled = true;

        // load user dictionary
        TXTextControl.Proofing.loadUserDictionary(data.name, data.words, data.language);
        alert("Dictionary " + data.name + " successfully loaded.");
    }

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