AngularJS确认和承诺 [英] AngularJS validation and promises
问题描述
在一个角的应用程序,形式通过自定义功能的JS,然后提交验证。
基于一个条件,我需要显示确认对话框给用户,等待确认或拒绝,然后验证进行。
我在与异步实现这一目标的困难。我相信我没有正确使用的承诺,但不知道需要更新的东西。
In an Angular app, form is validated via custom JS function before submitting. Based on a condition, I need to show a confirmation dialog to the user, wait for confirmation or rejection, then proceed with validation. I'm having difficulties with achieving this asynchronously. I believe I am not using the promise correctly, but not sure what needs to be updated.
工厂
app.factory("confirmDialogService", ['$q', 'ngDialog',
function ($q, ngDialog ) {
return {
popConfirm: function () {
var deferred = $q.defer();
var confirmed;
setTimeout(function () {
ngDialog.openConfirm({
template: 'template/confirmDialog.html',
className: 'ngdialog-theme-default'
}).then(function (value) {
console.log('Modal promise resolved. Value: ', value);
deferred.resolve(confirmed = true);
}, function (reason) {
console.log('Modal promise rejected. Reason: ', reason);
deferred.reject(confirmed = false);
});
}, 1000);
return deferred.promise;
}
};
}]);
控制器
$scope.checkSomething = function (){
if(needsConfirmation)
{
console.log('about to pop confirm');
confirmationService.popConfirm().then(function(confirmed){
console.log( 'from popConfirm() ' + confirmed + ''); // never logged
return confirmed;
}, function(){
// something went wrong
return false;
});
}
else
return true;
}
确认对话框显示,但点击yes或no的对话框中没有按预期产生结果。
The confirmation dialog is shown, but clicking yes or no in the dialog does not produce results as expected.
我想什么,能够做的就是根据用户是否确认或驳回的对话框中,沿
What I'd like to be able to do is get a true/false value depending whether a user confirmed or dismissed the dialog, along the lines of
var canProceed = $scope.checkSomething();
我想我需要包装成其他承诺,但不知道如何。
任何帮助将大大AP preciated。
I think I need to wrap this into another promise but not sure how. Any help will be greatly appreciated.
谢谢,
推荐答案
由于 openConfirm
已返回一个承诺,你不需要再创建一个与 $ q.defer()
:
Since openConfirm
already returns a Promise, you don't need to create one more with $q.defer()
:
app.factory("confirmDialogService", ['$q', 'ngDialog', function ($q, ngDialog) {
return {
popConfirm: function () {
return ngDialog.openConfirm({
template: 'template/confirmDialog.html',
className: 'ngdialog-theme-default'
}).then(function (value) {
console.log('Modal promise resolved. Value: ', value);
return true;
}, function (reason) {
console.log('Modal promise rejected. Reason: ', reason);
return false;
});
}
};
}]);
之后 checkSomething
会用这种方式:
$scope.checkSomething = function () {
if (needsConfirmation) {
return confirmationService.popConfirm().then(function (confirmed) {
return confirmed;
}, function () {
return false;
});
} else {
return $q.when(true);
}
}
请注意它是如何不再返回真正
或假
,而是一个承诺对象。最后,你应该使用 $ scope.checkSomething()
像承诺异步操作:
Note how it no longer returns true
or false
, but rather a promise object. Finally you should use $scope.checkSomething()
like asynchronous operation with promises:
$scope.checkSomething().then(function() {
// ok, proceed
}, function() {
// something failed
});
汇总,了解它的 checkSomething
应该返回一个承诺,最重要的事情不只是真/假。
Summarizing, the most important thing to understand it that checkSomething
should return a promise and not just true/false.
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