36

以下是到目前为止的代码

    <!doctype html>
<html ng-app>
<head>
    <script src="http://code.angularjs.org/1.1.2/angular.min.js"></script>
    <script type="text/javascript">
    function Ctrl($scope) {
        var initial = {text: 'initial value'};
        $scope.myModel = angular.copy(initial);
        $scope.revert = function() {
            $scope.myModel = angular.copy(initial);
            $scope.myForm.$setPristine();
        }
    }
    </script>
</head>
<body>
    <form name="myForm" ng-controller="Ctrl">
        myModel.text: <input name="input" ng-model="myModel.text">
        <p>myModel.text = {{myModel.text}}</p>
        <p>$pristine = {{myForm.$pristine}}</p>
        <p>$dirty = {{myForm.$dirty}}</p>
        <button ng-click="revert()">Set pristine</button>
    </form>
</body>
</html>

如何提醒browser close或url redirect万一有一些未保存的数据，以便用户可以决定是否继续？

4

7 回答 7

72

这样的事情应该这样做：

<!doctype html>
<html ng-app="myApp">
<head>
    <script src="http://code.angularjs.org/1.1.2/angular.min.js"></script>
    <script type="text/javascript">
    function Ctrl($scope) {
        var initial = {text: 'initial value'};
        $scope.myModel = angular.copy(initial);
        $scope.revert = function() {
            $scope.myModel = angular.copy(initial);
            $scope.myForm.$setPristine();
        }
    }

    angular.module("myApp", []).directive('confirmOnExit', function() {
        return {
            link: function($scope, elem, attrs) {
                window.onbeforeunload = function(){
                    if ($scope.myForm.$dirty) {
                        return "The form is dirty, do you want to stay on the page?";
                    }
                }
                $scope.$on('$locationChangeStart', function(event, next, current) {
                    if ($scope.myForm.$dirty) {
                        if(!confirm("The form is dirty, do you want to stay on the page?")) {
                            event.preventDefault();
                        }
                    }
                });
            }
        };
    });
    </script>
</head>
<body>
    <form name="myForm" ng-controller="Ctrl" confirm-on-exit>
        myModel.text: <input name="input" ng-model="myModel.text">
        <p>myModel.text = {{myModel.text}}</p>
        <p>$pristine = {{myForm.$pristine}}</p>
        <p>$dirty = {{myForm.$dirty}}</p>
        <button ng-click="revert()">Set pristine</button>
    </form>
</body>
</html>

注意，$locationChangeStart 的监听器在这个例子中没有被触发，因为在这个简单的例子中 AngularJS 不处理任何路由，但它应该在实际的 Angular 应用程序中工作。

于 2013-02-13T12:25:47.807 回答
34

我扩展了@Anders 的答案，以在指令被销毁时（例如：当路由更改时）清理侦听器（解除绑定列表），并添加了一些语法糖来概括使用。

confirmOnExit 指令：

/**
 * @name confirmOnExit
 * 
 * @description
 * Prompts user while he navigating away from the current route (or, as long as this directive 
 * is not destroyed) if any unsaved form changes present.
 * 
 * @element Attribute
 * @scope
 * @param confirmOnExit Scope function which will be called on window refresh/close or AngularS $route change to
 *                          decide whether to display the prompt or not.
 * @param confirmMessageWindow Custom message to display before browser refresh or closed.
 * @param confirmMessageRoute Custom message to display before navigating to other route.
 * @param confirmMessage Custom message to display when above specific message is not set.
 * 
 * @example
 * Usage:
 * Example Controller: (using controllerAs syntax in this example)
 * 
 *      angular.module('AppModule', []).controller('pageCtrl', [function () {
 *          this.isDirty = function () {
 *              // do your logic and return 'true' to display the prompt, or 'false' otherwise.
 *              return true;
 *          };
 *      }]);
 * 
 * Template:
 * 
 *      <div confirm-on-exit="pageCtrl.isDirty()" 
 *          confirm-message-window="All your changes will be lost."
 *          confirm-message-route="All your changes will be lost. Are you sure you want to do this?">
 * 
 * @see
 * http://stackoverflow.com/a/28905954/340290
 * 
 * @author Manikanta G
 */
ngxDirectivesModule.directive('confirmOnExit', function() {
    return {
        scope: {
            confirmOnExit: '&',
            confirmMessageWindow: '@',
            confirmMessageRoute: '@',
            confirmMessage: '@'
        },
        link: function($scope, elem, attrs) {
            window.onbeforeunload = function(){
                if ($scope.confirmOnExit()) {
                    return $scope.confirmMessageWindow || $scope.confirmMessage;
                }
            }
            var $locationChangeStartUnbind = $scope.$on('$locationChangeStart', function(event, next, current) {
                if ($scope.confirmOnExit()) {
                    if(! confirm($scope.confirmMessageRoute || $scope.confirmMessage)) {
                        event.preventDefault();
                    }
                }
            });

            $scope.$on('$destroy', function() {
                window.onbeforeunload = null;
                $locationChangeStartUnbind();
            });
        }
    };
});

用法： 示例控制器：（在此示例中使用 controllerAs 语法）

angular.module('AppModule', []).controller('pageCtrl', [function () {
    this.isDirty = function () {
        // do your logic and return 'true' to display the prompt, or 'false' otherwise.

        return true;
    };
}]);

模板：

<div confirm-on-exit="pageCtrl.isDirty()" 
    confirm-message-window="All your changes will be lost." 
    confirm-message-route="All your changes will be lost. Are you sure you want to do this?">
于 2015-03-06T19:11:41.797 回答
16

安德斯的回答很好，但是，对于使用 Angular ui-router 的人，您应该使用'$stateChangeStart'而不是'$locationChangeStart'.

于 2015-03-09T01:10:44.893 回答
9

我修改了@Anders 答案，使指令不包含硬编码的表单名称：

    app.directive('confirmOnExit', function() {
        return {
            link: function($scope, elem, attrs, ctrl) {
                window.onbeforeunload = function(){
                    if ($scope[attrs["name"]].$dirty) {
                        return "Your edits will be lost.";
                    }
                }
            }
        };
    });

这是它的html代码：

<form name="myForm" confirm-on-exit>
于 2015-11-20T21:37:35.177 回答
3

也许它会对某人有所帮助。 https://github.com/umbrella-web/Angular-unsavedChanges

使用此服务，您可以侦听范围内任何对象的未保存更改（不仅是表单）

于 2013-12-02T13:14:37.873 回答
0

要将Anders Ekdahl$scope的优秀答案与 Angular 1.5 组件一起使用，请在组件的控制器中注入：

angular
  .module('myModule')
  .component('myComponent', {
    controller: ['$routeParams', '$scope',
      function MyController($routeParams, $scope) {
        var self = this;

        $scope.$on('$locationChangeStart', function (event, next, current) {
          if (self.productEdit.$dirty && !confirm('There are unsaved changes. Would you like to close the form?')) {
            event.preventDefault();
          }
        });
      }
    ]
  });
于 2016-10-16T07:23:18.713 回答
0

接受的答案很好，但是我在正确地处理我的表单控制器时遇到了问题，因为有些表单我使用带有属性的form标签，而在其他时候我使用指令。此外，如果您使用的是使用or类型模式的 typescript 样式函数，例如nameng-formthisvm<form name='$ctrl.myForm'...

我很惊讶没有人提到这一点，但我的解决方法是利用指令的 require 属性，让 angular 给我一个对表单控制器本身的引用。

我已经更新了下面接受的答案以显示我的更改，请注意链接函数的 require 属性和附加参数。

angular.module("myApp", []).directive('confirmOnExit', function() {
        return {
            restrict: 'A',
            require: 'form',
            link: function($scope, elem, attrs, form) {
                window.onbeforeunload = function(){
                    if (form.$dirty) {
                        return "The form is dirty, do you want to stay on the page?";
                    }
                }
                $scope.$on('$locationChangeStart', function(event, next, current) {
                    if (form.$dirty) {
                        if(!confirm("The form is dirty, do you want to stay on the page?")) {
                            event.preventDefault();
                        }
                    }
                });
            }
        };
    });

有了这个，我可以保证我对表单控制器有一个很好的处理，因为如果 Angular 在元素上找不到表单控制器，它会抛出一个错误。

您还可以添加修饰符，例如^和? 例如require='^form'拉一个祖先表单或者require='?form'表单是可选的（这不会破坏指令，但您需要检查您自己是否有一个有效表单控制器的句柄）。

于 2018-08-02T20:50:38.887 回答