以下是目前的代码
<!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>
如果有未保存的数据，如何在browser close或url redirect上发出提醒，以便用户可以决定是否继续？
答案 0 :(得分：71)
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.$dirty}}</p>
<button ng-click="revert()">Set pristine</button>
</form>
</body>
</html>
请注意，在此示例中未触发$ locationChangeStart的侦听器，因为AngularJS在这样一个简单示例中不处理任何路由，但它应该在实际的Angular应用程序中工作。
答案 1 :(得分：33)
当指令被销毁时（例如：当路线发生变化时），我已经扩展了@Anders的答案以清理听众（解除绑定），并添加了一些语法糖以概括用法。
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;
$locationChangeStartUnbind();
});
}
};
});
使用方法： 示例控制器：（在此示例中使用controllerAs语法）
angular.module('AppModule', []).controller('pageCtrl', [function () {
this.isDirty = function () {
// do your logic and return 'true' to display the prompt, or 'false' otherwise.
return true;
};
}]);
<强>模板：
<div confirm-on-exit="pageCtrl.isDirty()"
confirm-message-window="All your changes will be lost."
confirm-message-route="All your changes will be lost. Are you sure you want to do this?">
答案 2 :(得分：16)
Anders的答案很好，但对于使用Angular ui-router的用户，您应该使用'$stateChangeStart'代替'$locationChangeStart'。
答案 3 :(得分：9)
我修改了@Anders答案，以便该指令不包含硬编码的表单名称：
app.directive('confirmOnExit', function() {
return {
link: function($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>
答案 4 :(得分：3)
也许这对某人有帮助。 https://github.com/umbrella-web/Angular-unsavedChanges
使用此服务，您可以侦听范围内任何对象（不仅是表单）的未保存更改
答案 5 :(得分：0)
要使用Anders Ekdahl对Angular 1.5组件的出色答案，请在组件的控制器中注入$scope：
angular
.module('myModule')
.component('myComponent', {
controller: ['$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();
}
});
}
]
});
答案 6 :(得分：0)
可接受的答案很好，但是由于某些表单我将form标签与name属性一起使用，而其他时候我却使用了正确的表单控制器，因此存在问题ng-form指令。另外，如果您要使用this或vm类型模式的打字稿样式功能，例如<form name='$ctrl.myForm'...
令我惊讶的是，没有人提到这一点，但是我的解决方法是利用指令的require属性，并让angular给我一个对表单控制器本身的引用。
我已经更新了下面接受的答案，以显示我的更改，请注意require属性和链接函数的其他参数。
angular.module("myApp", []).directive('confirmOnExit', function() {
return {
restrict: 'A',
require: 'form',
link: function($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，我可以保证我在表单控制器上拥有良好的处理能力，因为如果angular在元素上找不到表单控制器，它将抛出错误。
您还可以添加诸如 ^ 和？之类的修饰符，例如require='^form'以提取祖先表单，如果表单是可选的，则可以添加require='?form'（这不会破坏该指令，但是您需要自己检查一下有效表单控制器上的句柄）。