AngularUI-Bootstrap's Typeahead Can't Read `length` Property of `undefined`

Question

I am getting the following error when I attempt to get a typeahead values from AngularUI-Bootstrap, using a promise.

TypeError: Cannot read property \'length         


        

Answer 1

$scope.getTypeaheadValues is not returning any array. It returns null, because your return statement is in the callback function "success", which is called asynchrony.

Maybe this will work:

$scope.getTypeaheadValues = function($viewValue)
{    
    var output = [];
    $http({
        method: 'GET',
        url: 'api/v1/person?name__icontains=' + $viewValue
    }).error(function ($data) {
        console.log("failed to fetch typeahead data");
    }).success(function ($data) {            
        $data.objects.forEach(function (person)
        {
            output.push(person.name);
        });
        console.log(output);        
    });
    return output;
}

Answer 2

$scope.getTypeaheadValues = function($viewValue)
{
    var someOutput="";//return something

    $http({
        method: 'GET',
        url: 'api/v1/person?name__icontains=' + $viewValue
    }).error(function (data) {
        console.error(data);
    }).success(function (data) {
        console.log(data);//Do whatever you want 
    });
return someOutput;

}

//The return statement is missing

Answer 3

This problem was two fold.

The first is that I was not returning the promise event (the $http call). The lack of a return statement (as @tobo points out) is what was causing the error directly. I needed to be returning the promise though, not the array.

The second is that I need to be using .then rather than .success for AngularUI-Bootstrap to pick up the results.

I ran across the following question: How to tie angular-ui's typeahead with a server via $http for server side optimization?

Which updated my function call to the below:

$scope.getTypeaheadValues = function($viewValue)
{
    return $http({
        method: 'GET',
        url: 'api/v1/person?name__icontains=' + $viewValue
    }).then(function ($response) {
        var output = [];

        console.log($data);

        $response.data.objects.forEach(function (person)
        {
            output.push(person.name);
        });

        console.log(output);
        return output;
    });
}