If you look in the DevTools console, you'll see that you're getting this error: Cannot read property 'toUpperCase' of undefined
. To solve it, it looks like you'll need to wrap your filter code in an if block to test for undefined inputs.
upperCaseFilter: function(value) {
if (value) {
return value.toUpperCase();
}
}
Here's the fixed version: http://jsbin.com/yubujiku/2/edit?html,css,output