Javascript 带有嵌套承诺的$q.all也使用$q.all创建
以下函数尝试返回仅在所有异步HTTP调用完成时才会解析的承诺:Javascript 带有嵌套承诺的$q.all也使用$q.all创建,javascript,angularjs,promise,angular-promise,angularjs-http,Javascript,Angularjs,Promise,Angular Promise,Angularjs Http,以下函数尝试返回仅在所有异步HTTP调用完成时才会解析的承诺: $scope.saveThat = function () { var promises = []; for (var i = 0; i < array.length; i++) { var newPromise = $q.defer(); promises.push(newPromise); // some more code... (fu
$scope.saveThat = function () {
var promises = [];
for (var i = 0; i < array.length; i++) {
var newPromise = $q.defer();
promises.push(newPromise);
// some more code...
(function (i, newPromise) {
$http(httpData)
.success(function (response) {
newPromise.resolve('Success');
})
.error(function (response) {
newPromise.reject('Error');
});
})(i, newPromise);
}
return $q.all(promises);
};
我的问题是,即使promise2中的承诺尚未解决,第二个承诺(
$q.all([promise1,promise2])
也会解决。因为您没有创建一个承诺的数组,实际上它包含一个$q.defer()对象。你应该使用
promises.push(newPromise.promise);
而不是
promises.push(newPromise);
此外,您还需要避免这些反模式,因为您正在不必要地创建$q
对象,因为那里有从$http.get
返回的promise对象
代码
$scope.saveThat = function() {
var promises = [];
for (var i = 0; i < array.length; i++) {
// some more code...
var promise = $http(httpData)
.then(function(response) {
return 'Success'; //returning data from success resolves that promise with data
}, function(response) {
return 'Error'; //returning data from error reject that promise with data
});
promises.push(promise); //creating promise array
}
return $q.all(promises); //apply $q.all on promise array
};
$scope.saveThat=function(){
var承诺=[];
对于(var i=0;i
停止使用,您的问题就会消失。@Bergi,非常感谢!是的,我对承诺绝对是新手。您在哪里使用proimise
变量?你在哪里初始化newPromise
?@miparnisari那是我的错..复制粘贴错误。看看我的editAh我想是的:)谢谢你的帮助,我会试试你说的,让你知道。最后一个问题,而不是返回“错误”代码>我是否可以写入返回“一些自定义错误消息;”
并捕获它?@miparnisari:您应该执行抛出新错误(“自定义消息”+响应)
,这样承诺就会被拒绝
$scope.saveThat = function() {
var promises = [];
for (var i = 0; i < array.length; i++) {
// some more code...
var promise = $http(httpData)
.then(function(response) {
return 'Success'; //returning data from success resolves that promise with data
}, function(response) {
return 'Error'; //returning data from error reject that promise with data
});
promises.push(promise); //creating promise array
}
return $q.all(promises); //apply $q.all on promise array
};