Uncaught TypeError: Cannot read property 'toString' of undefined JavaScript Sharepoint

Question

I have the following function in my JavaScript code and when I run it shows me the following error Cannot read property 'toString' of undefined I am developing an SharePoing web application.

function startTest(quizID) {

   currentQuizItem = quizList.getItemById(quizID);
   var quizName;
   context.load(currentQuizItem);
   var userName = user.get_title();

   var audiencenames = currentQuizItem.get_fieldValues()["Audienca"];
   var straudience = audiencenames.toString();
   straudience = straudience.toUpperCase();
   straudience = straudience.replace(/\s/g, '');

   userName = userName.toUpperCase();
   userName = userName.replace(/\s/g, '');
   var rezultati = straudience.match(userName);
   alert(rezultati);
}

please help me!

Answer 1

context.executeQueryAsync() is missing in your code. Add it and try.

function startTest(quizID) {

    currentQuizItem = quizList.getItemById(quizID);
    var quizName;
    context.load(currentQuizItem);
    var userName = user.get_title();
    context.executeQueryAsync(function() {
            var audiencenames = currentQuizItem.get_fieldValues()["Audienca"];
            var straudience = audiencenames.toString();
            straudience = straudience.toUpperCase();
            straudience = straudience.replace(/\s/g, '');

            userName = userName.toUpperCase();
            userName = userName.replace(/\s/g, '');
            var rezultati = straudience.match(userName);
            alert(rezultati);
        },

        function() {
            // handle error
        });
}

Also make sure that your variables are not undefined before using them. Ex. You can set condition before using them.