我正在尝试使用nodejs和angular从文件夹读取文件。我能够通过文件夹迭代并访问文件数据,这里没有问题。我的主要问题是我无法将结果(名称数组)传递给$范围并将其显示给用户 - 数组始终为空。我认为这与FS异步行为有关。
我正在做以下操作:
角服务:
myApp.service('peopleService', ['$q', '$http', function($q, $http) {
var self = this;
this.people = [];
var peopleService = new Promise(function(resolve, reject) {
fs.readdir(folderPath, function(err, files) {
files.forEach(function(file) {
var obj;
fs.readFile(filePath, 'utf8', function (err, data) {
obj = JSON.parse(data);
var person = { name: obj.obituary.name, ... };
self.people.push(person);
});
});
});
resolve(self.people);
}).then(function(people) {
return people;
});
return peopleService;
}]);
角控制器:
myApp.controller('homeController', ['$scope', '$http', 'peopleService', function($scope, $http, peopleService) {
$scope.people = [];
peopleService.then(function(people) {
$scope.people = people;
console.log($scope.people); //empty array (Array[0])
});
}]);
角页:
<div class="list-group">
<a href="#" class="list-group-item" ng-repeat="person in people">
{{person.name}}
</a>
</div>
我在做什么错?
为什么将nodejs代码与angularjs代码混合?
问题是在执行readdir
和readFile
回调之前执行resolve(self.people)
,因为它们是异步的,因此您必须确保在readdir
和readFile
回调之后执行resolve(self.people)
:
new Promise(function(resolve, reject) {
fs.readdir(folderPath, function(err, files) {
var count = 0;
files.forEach(function(file) {
var obj;
fs.readFile(filePath, 'utf8', function (err, data) {
obj = JSON.parse(data);
var person = { name: obj.obituary.name, ... };
self.people.push(person);
count++;
if(count === files.length){
resolve(self.people);
}
});
});
});
}).then(function(people) {
return people;
});