AngularJS，具有递归函数的承诺 [英] AngularJS, promise with recursive function

问题描述

我正在尝试将 AngularJS promise/then 与递归函数一起使用.但是 then 函数没有被调用(错误、成功、通知回调都没有被调用).

I'm trying to use the AngularJS promise/then with a recursive function. But the then-function is not called (none of the error-, success-, notify-callbacks gets called).

这是我的代码:

递归函数

loadSection2 = function() {

    var apiURL = "http://..."

    var deferred = $q.defer();

    $http({
        method: "GET",
        url: apiURL
    }).success(function(result, status, headers, config) {
        console.log(result);
        loadCount++;
        if(loadCount < 10) {
            newSectionArray.push(result);
            loadSection2(); 
        } else {
            loadCount = 0;
            deferred.resolve();
            return deferred.promise;
        }
    }).error(function() {
        return deferred.reject();
    });
    deferred.notify();
    return deferred.promise;
};

然后

loadSection2().then(function() {
    console.log("NEW SECTIONS LOADED, start adding to document");
    addContent();
}, function() {
    console.log("ERROR CALLBACK");
}, function() {
    console.log("NOTIFY CALLBACK");
}).then(function() {
    loadScrollActive = false;
});

我认为，那么至少必须获得第一个通知回调.但是没有回调.那么不使用递归函数吗?

I think, the then has to get the first notify-callback at least. But there is no callback. Is then not working with recursive function?

推荐答案

EDIT - 11/11/2015 如果您不关心通知，还有一种更简洁的方法:

EDIT - 11/11/2015 There is a much cleaner way if you don't care about notify:

loadSection2 = function (){
    var apiURL = "http://..."
    return $http.get(apiURL)
        .then(function(response){
            loadCount++;        
            if (loadCount < 10) {
                newSectionArray.push(response.data);
                return loadSection2();
            }
            loadCount = 0;
        });

};

此处提供旧答案:

你可以一直传递承诺.

loadSection2 = function(deferred) {

    if(!deferred){
        deferred = $q.defer();
    }
    var apiURL = "http://..."

    $http({
        method: "GET",
        url: apiURL
    }).success(function(result, status, headers, config) {
        console.log(result);
        loadCount++;
        if(loadCount < 10) {
            newSectionArray.push(result);
            loadSection2(deferred); 
        } else {
            loadCount = 0;
            deferred.resolve();
            return deferred.promise;
        }
    }).error(function() {
        return deferred.reject();
    });
    deferred.notify();
    return deferred.promise;
};

这篇关于AngularJS，具有递归函数的承诺的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！