How to get a count back for my json?

I have a response coming back from my server that looks like this

{"Errors":{"ViewModels[0]":"Not a valid number."},"IsValid":false,"SuccessMessage":null}

I want to loop through all the values contrained in Errors(in this case there is only one but there could many).

I tried

   function createErrorList(response)
    {
        for (var i = 0; i < response.Errors.length; i++)
        {
            var error = response.Errors[i];
     开发者_StackOverflow       alert(error);
        }
    }

length is alwasy undefined though. So I am not sure what I am doing wrong.

Errors is not an array it's an object in this case. The server response would have to be something like:

{"Errors":[{"ViewModels[0]":"Not a valid number."},{"viewmodels[1]":"Another Message"}],"IsValid":false,"SuccessMessage":null}

For that to work. Note the [].

for( var key in response.Errors ) {
  var value = response.Errors[key];
}

for (var error in response.Errors)
{
    alert(response.Errors[error]);
}

You may also want to include hasOwnProperty if you are paranoid about prototypes on the Object object.

response.Errors is a dictionary not a list so you have to iterate through as such