问题
Below is the code so far
<!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>
How to alert on browser close or url redirect in case there is some unsaved data, so that user can decide whether to continue?
回答1:
Something like this should do it:
<!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>
Note that the listener for $locationChangeStart isn't triggered in this example since AngularJS doesn't handle any routing in such a simple example, but it should work in an actual Angular application.
回答2:
I've extended the @Anders answer to clean up listeners (unbind listers) when directive is destroyed (ex: when route changes), and added some syntactic sugar to generalise the usage.
confirmOnExit Directive:
/**
* @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;
$locationChangeStartUnbind();
});
}
};
});
Usage: Example Controller: (using controllerAs syntax in this example)
angular.module('AppModule', []).controller('pageCtrl', [function () {
this.isDirty = function () {
// do your logic and return 'true' to display the prompt, or 'false' otherwise.
return true;
};
}]);
Template:
<div confirm-on-exit="pageCtrl.isDirty()"
confirm-message-window="All your changes will be lost."
confirm-message-route="All your changes will be lost. Are you sure you want to do this?">
回答3:
Anders's answer works fine, However, for people who uses Angular ui-router, you should use '$stateChangeStart' instead of '$locationChangeStart'.
回答4:
I modified the @Anders answer so that the directive does not contain the form name hard coded:
app.directive('confirmOnExit', function() {
return {
link: function($scope, elem, attrs, ctrl) {
window.onbeforeunload = function(){
if ($scope[attrs["name"]].$dirty) {
return "Your edits will be lost.";
}
}
}
};
});
Here is the html code for it:
<form name="myForm" confirm-on-exit>
回答5:
Maybe it will be helpful for someone. https://github.com/umbrella-web/Angular-unsavedChanges
Using this service you can listen unsaved changes for any object in the scope (not only the form)
回答6:
To use Anders Ekdahl's excellent answer with an Angular 1.5 component, inject the $scope in the component's controller:
angular
.module('myModule')
.component('myComponent', {
controller: ['$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();
}
});
}
]
});
回答7:
The accepted answer is great, however I had an issue with properly getting a handle on my form controller consistently since some forms I use the form tag with the name attribute and at other times i use the ng-form directive. Also, if you're using typescript style functions utilizing the this or vm type pattern e.g. <form name='$ctrl.myForm'...
I'm surprised no one else has mentioned this, but my fix was to utilize the require property of the directive and let angular give me a reference to the form controller itself.
I've updated the accepted answer below to show my changes, notice the require property and the additional parameter to the link function.
angular.module("myApp", []).directive('confirmOnExit', function() {
return {
restrict: 'A',
require: 'form',
link: function($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();
}
}
});
}
};
});
With this I can guarantee that I have a good handle on the form controller because angular will throw an error if it cannot find a form controller on the element.
You can also add modifiers like ^ and ? such as require='^form' to pull an ancestor form or require='?form' if the form is optional (this wont break the directive, but you will need to check that you have a handle on a valid form controller yourself).
来源：https://stackoverflow.com/questions/14852802/detect-unsaved-changes-and-alert-user-using-angularjs