Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript

Stivan Radev
Stivan Radev
1,475 Points
Posted by Stivan Radev
Stivan Radev
1,475 Points

Uncaught TypeError: Cannot read property 'inoffice' of undefined

So here is my code that shows the error "Uncaught TypeError: Cannot read property 'inoffice' of undefined"

var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function() {
    if(xhr.readyState === 4 && xhr.status === 200) {
        var employees = JSON.parse(xhr.responseText);
        var statusHTML = '<ul class="bulleted">';
        for(var i=0; i<employees.length; i += 1); {
            if (employees[i].inoffice === true) {
                statusHTML = '<li class="in">'; 
            } else {
                statusHTML = '<li class="out">';    
            }
            statusHTML += employees[i].name;
            statusHTML += '</li>';
        }
        statusHTML += '</ul>';
        document.getElementById('employeeList').innerHTML = statusHTML;
    }
};
xhr.open('GET', '../data/employees.json');
xhr.send();

Here is a code that works without that error 

var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function () {
  if(xhr.readyState === 4 && xhr.status === 200) {
    var employees = JSON.parse(xhr.responseText);
    var statusHTML = '<ul class="bulleted">';
    for (var i=0; i<employees.length; i += 1) {
      if (employees[i].inoffice === true) {
        statusHTML += '<li class="in">';
      } else {
        statusHTML += '<li class="out">';
      }
      statusHTML += employees[i].name;
      statusHTML += '</li>';
    }
    statusHTML += '</ul>';
    document.getElementById('employeeList').innerHTML = statusHTML;
  }
};
xhr.open('GET', '../data/employees.json');
xhr.send();

What am I doing wrong on the first code?

1 Answer

Adam Beer
Adam Beer
11,314 Points
Adam Beer
Adam Beer
11,314 Points

After the i += 1 delete the semicolon :)

Stivan Radev
Stivan Radev
1,475 Points
Stivan Radev
Stivan Radev
1,475 Points

Never saw that :O Thank you so much!!