我做了一个alertForm指令，并想在按键ESC或click outside of modal之后将'show'设置为'false'。

我对'show'变量使用双向绑定将其关闭。

<alert-modal show="showAlertModal"></alert-modal>

// controller
$scope.showAlertModal = true;

// directive
common.directive('alertModal',function () {
    var temp = '<div class="modal fade" tabindex="-1" role="dialog" data-toggle="modal" aria-labelledby="myModalLabel">\n' +
        '            <div class="modal-dialog" role="document">\n' +
        '                <div class="modal-content">\n' +
        '                    <div class="modal-body">\n' +
        '                        <h5>This is message section</h5>\n' +
        '                    </div>\n' +
        '                    <div class="modal-footer">\n' +
        '                        <button type="button" ng-click="clickYesAndHide()">Yes</button>\n' +
        '                    </div>\n' +
        '                </div>\n' +
        '            </div>\n' +
        '        </div>';

    return {
        restrict: 'E',scope: {
            show: '=',},replace: true,// Replace with template
        transclude: true,// To use custom content
        link: function ($scope,$element,$attr) {

            $scope.modalOpen = function () {
                $element.modal();
            }
            $scope.modalClose = function () {
                $element.modal('hide');
            };
            $scope.noDisplay = function () {
                $scope.show = false;
            }
            $scope.clickYesAndHide = function () {
                $scope.noDisplay();
            }
            $element.on('hide.bs.modal',function () {
                $scope.noDisplay();
                console.log($scope.show); // false;
                // But parent's $scope.showAlertModal is 'true'
            })

            $scope.$watch('show',function () {
                $scope.show
                    ? $scope.modalOpen()
                    : $scope.modalClose()
            });
        },template: temp
    }
});

我希望父范围show变量为false，但是当我在模态之外单击时，仍然输出为true。在关闭模式之前如何设置父范围？