Question

我是AngularJS的新手，并且需要编辑以下代码。

 scope.findData = [];
 scope.clientId;
 scope.identityDocuments_a = [];


scope.getClientIdentityDocuments_a = function(clientID){  
        resourceFactory.clientResource.getAllClientDocuments({clientId: clientID, anotherresource: 'identifiers'}, function(data){
                scope.identityDocuments_a = data;
            });            
        };

        scope.findOptions = function(value){
            var i;
            var deferred = $q.defer();
resourceFactory.clientResource.getAllClientsWithoutLimit({displayName: value, orderBy : 'id', officeId : scope.group.officeId, sortOrder : 'ASC', orphansOnly : true}, function (data) {
                deferred.resolve(data.pageItems);
                  for (i = 0; i <= data.pageItems.length; i++) {

                 scope.clientId = data.pageItems[i].id;
                 scope.getClientIdentityDocuments_a(scope.clientId);
                    //<- I want to access scope.identityDocuments_a here
                }
                scope.findData = data.pageItems;

              });
            return deferred.promise;
        };

这两个功能都在同一个控制器下。我看了Accessing $scope variable from another method in the same controller Angularjs，但似乎没有用。我哪里错了？提前谢谢。

Answer 1

好的，我看到了问题。你的getClientIdentityDocuments_a（）正在使用回调函数。异步数据检索是单独进行的，因此在您想要使用它时不会设置该值。您可以通过返回承诺

来解决此问题

scope.getClientIdentityDocuments_a = function(clientID){
        var defer = $q.defer();  
        resourceFactory.clientResource.getAllClientDocuments(
                  {clientId: clientID, 
                   anotherresource: 'identifiers'}, function(data){
                scope.identityDocuments_a = data;
                defer.resolve(data);
            });            
            return defer.promise;
        };

然后，在第二个函数中使用数据：

scope.getClientIdentityDocuments_a(scope.clientId).then(function(documents) {
       // at this point, the scope.identityDocuments_a should be available,
       // but you could just set it here, since the document variable is
       // returning the same thing
    console.dir(scope.identityDocuments_a) // should have the returned data
    console.dir(documents)                 // should be the same as above
});
// Here, the documents will NOT be available, because this executes before
// the promise is resolved
console.dir(scope.identityDocuments_a) // [] or undefined

更新：为了澄清，如果在getClientIdentityDocuments_a中你要直接分配变量，例如

scope.getClientIdentityDocuments_a = function(clientID){
        scope.identityDocuments_a = some_document;
};

您不需要承诺，您的代码也可以使用。但是，由于您是从异步源检索数据，因此您的第二个功能是在设置值之前尝试使用数据。

AngularJs在另一个函数中访问范围变量

1 个答案: