AngularJs filter "Error while interpolating"

Question

Inside my AngularJs filter I have the following:

 return function(list){
      return list;
 }

That works fine

However, the following throws an error of "Error while interpolating {{ list | filterName}}...TypeError: list is undefined"

 return function(list){
      return list.length;
 }

What is happening that is causing list to be undefined for a brief moment when this function runs, or what can I do to fix this issue. The value still gets returned, I just have a nasty error in console.

it happens when angularJs is bootstrapping the page, for a brief moment (between the moment it starts and the moment it actually reaches this part of your page) the value will be undefined, you can simply do if(typeof(list) != undefined){return list.length;} — DotDotDot
– DotDotDot, Commented Aug 20, 2013 at 13:48

Igor · Accepted Answer · 2014-09-24 10:08:20Z

2

DotDotDot already answered question, but I'd like to improve his answer:

return function(list){
    return (typeof(list) !== 'undefined') ? list.length : 0;
}

Update for Angular users:

return function(list){
    return angular.isDefined(list) ? list.length : 0;
}

edited Sep 24, 2014 at 10:08

answered Sep 2, 2013 at 12:33

Igor

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