我正在使用Ionic创建天气应用程序

Question

我正在开发天气应用程序。为此，我想按城市搜索天气。我按城市获取天气信息，但问题是 即;在我输入类似的搜索框中 例如：dfdfdfdf（或）12435我收到天气信息。不应该发生它应该只检索城市的天气信息。我已经编辑了我的代码。以下是完整代码

.controller('SearchInWeatherH01Ctrl', function ($scope, $state, Weather, $resource, $http,$rootScope) {
    $scope.checkWeather = function (city) {
        $http.get("https://maps.googleapis.com/maps/api/geocode/json?address=" + encodeURIComponent(city))
        .success(function (response) {
            if (response.results.length) {
                if (response.results.length) {
                    var location = response.results[0].geometry.location;
                    $scope.lat = location.lat;
                    $scope.longit = location.lng;
                    Weather.getAtLocation(location.lat, location.lng).then(function (resp) {
                        if (city == null ) {
                             alert("Please Enter City Name");
                             return false;
                        }
                       $scope.current = resp.data;
                       console.log('GOT CURRENT',JSON.stringify( $scope.current));
                       $rootScope.$broadcast('scroll.refreshComplete');
        }, function (error) {
             alert('Unable to get current conditions');
             console.error(error);
        });
      }
    });
  }
})