angular.module('app', []).directive('ngDebounce', function($timeout) {
    return {
        restrict: 'A',
        require: 'ngModel',
        priority: 99,
        link: function(scope, elm, attr, ngModelCtrl) {
            if (attr.type === 'radio' || attr.type === 'checkbox') return;
            
            elm.unbind('input');
            
            var debounce;
            elm.bind('input', function() {
                $timeout.cancel(debounce);
                debounce = $timeout( function() {
                    scope.$apply(function() {
                        ngModelCtrl.$setViewValue(elm.val());
                    });
                }, attr.ngDebounce || 1000);
            });
            elm.bind('blur', function() {
                scope.$apply(function() {
                    ngModelCtrl.$setViewValue(elm.val());
                });
            });
        }
                     
    }
});