Cancelling ongoing Angular $http requests when there's a new request

Question

How does one cancel an ongoing Angular $http request when there's a new request?

I've got an Angular app with a view that updates live as the user types. Sometimes old requests complete after the latest request, meaning the view displays the wrong data. What's the most straightforward way to cancel the previous request when there's a new one?

Using Angular 1.5, for what it's worth.

<input ng-model = "query" ng-keyup = "search()"/>
{{results | json}}

// In the controller:
    $scope.search = function(){
        $http({
            method: "GET",
            url: "/endpoint.php"
            params: {
                query: $scope.query
            }
        }).then(function(response){
            $scope.results = response.data;
        })
    }

One solution I have tried:

// In the controller:
    var canceler = $q.resolve();    // New
    $scope.search = function(){
        canceler.resolve("Canceling old request");     // New
        $http({
            method: "GET",
            url: "/endpoint.php"
            params: {
                query: $scope.query
            },
            timeout: canceler.promise    // New
        }).then(function(response){
            $scope.results = response.data;
        })
    }

In this scenario, even though I'm calling canceler.resolve before the $http request, the request turns up as "failed".

Any insights?

edit: Solution found!

// In the controller:
    var canceler = $q.defer();

    $scope.search = function(){
        canceler.resolve("cancelled"); // Resolve the previous canceler
        canceler = $q.defer();        // Important: Create a new canceler! 
                                      // Otherwise all $http requests made will fail
        $http({
            method: "GET",
            url: "/endpoint.php"
            params: {
                query: $scope.query
            }
        }).then(function(response){
            $scope.results = response.data;
        })
    }

Answer 1

When you start a new search, call the cancel() function. And you can use a resolved variable to make sure that you do not abort your $http call before it starts. Something like this:

var canceler = $q.defer();
var resolved = false;

var cancel = function() {
    canceler.resolve("http call aborted");
};

$scope.search = function() {
    if (resolved) {
        cancel();
    }

    canceler = $q.defer();
    resolved = true;

    $http({
        method: "GET",
        url: "/endpoint.php"
        params: {
            query: $scope.query
        }
        timeout: canceler.promise
    }).then(function(response) {
        $scope.results = response.data;
        resolved = false;
    })
}

Don't forget to inject $q in your controller/directive/service.