javascript - 检查 angularjs 中未保存的表单数据(使用 ui-router 的多个表单)

Question

实现细节:

我正在使用 ui-router 在 ui-view div 中加载表单页面。我通过 Andres Ekdahi 提到了很好的例子, 如何使用相同的指令对多个表单进行 $dirty 检查？

表单 1

 <form name="myForm" ng-controller="Controller" confirm-on-exit>

表格2

<form name="iForm" ng-controller="Controller" confirm-on-exit ng-model="myModel">

app.js(指令)

myApp.directive('confirmOnExit', function() {
        return {
            link: function($scope, elem, attrs) {
                // condition when back page is pressed 
                window.onbeforeunload = function(){
                    if ($scope.myForm.$dirty) {
                        return "The formI is dirty, do you want to stay on the page?";
                    }
                }
                // condition when user try to load other form (via icons )
                $scope.$on('$stateChangeStart', function(event, next, current) {
                    if ($scope.myForm.$dirty) {
                        if(!confirm("myForm. Do you want to continue ?")) {
                            event.preventDefault();
                        }
                    }

                    if ($scope.iForm.$dirty) {
                        if(!confirm("iform. Do you want to continue ?")) {
                            event.preventDefault();
                        }
                    }
                });
            }
        };
    });

错误:

第一次加载页面时，$dirty 值为 false。然后我填写表单详细信息并单击第三个图标(文件)，我得到第二个表单脏检查错误 if ($scope.iForm.$dirty) 和 $dirty处于警戒状态。

angular.js:12520 TypeError: Cannot read property '$dirty' of undefined

和

<form name="iForm" ng-controller="Controller" confirm-on-exit="" ng-model="myModel" class="ng-pristine ng-untouched ng-valid ng-scope">

演示:Plunker

Answer 1

有一个更简单的方法。

只需将指令放在表单元素上并通过链接函数访问表单 Controller 即可:

myApp.directive('confirmOnExit', function() {
        return {
            require: 'form',
            link: function($scope, elem, attrs, formController) {
                // condition when back page is pressed 
                window.onbeforeunload = function(){
                    if (formController.$dirty) {
                        return "The form '" + formController.$name + "' is dirty, do you want to stay on the page?";
                    }
                }
                // condition when user try to load other form (via icons )
                $scope.$on('$stateChangeStart', function(event, next, current) {
                    if (formController.$dirty) {
                        if(!confirm(formController.$name + ". Do you want to continue ?")) {
                            event.preventDefault();
                        }
                    }
                });
            }
        };
    });