我有一个控制器这将启动在工厂API调用。目前，我开始呼叫，然后我有调用后函数来检查阵列的状态。但是我不知道如何迫使它在这里等待数据被收集，因此需要某种 $ Q 实施

I have a Controller which starts an API call in a Factory. Currently I start the call, then I have a function after that call to check the status of the Array. However I'm not sure how to force it to wait here while the data is being gathered, thus the need for some kind of $q implementation.

正如你可以在下面的截图中看到， vs.tickers 返回一个空对象或数组。后来终于在的console.log 在GetTickersFactory火灾：

As you can see in the screenshot below, vs.tickers returns an empty Object, or Array. Then finally the console.log in GetTickersFactory fires:

第一控制器

if (root.tickerType === 'portfolio') {

    // Call to factory to start the API GETS:
    GetTickersFactory.getTickers('portfolio');

    // I then call a function in the Factory to return the array
    // Which isn't ready yet of course since it returns undefined...
    vs.tickers = GetTickersFactory.returnPortfolioTickers();

    console.log('portfolio');
    console.log('vs.tickers = ', vs.tickers);
}

在GetTickersFactory getTickers功能 |也许这可以帮助：主旨为全厂

getTickers function in the GetTickersFactory | Perhaps this helps: the Gist for the full Factory.

function getTickers(type, load, searchedTicker) {
    load = load || loadString; searchedTicker = searchedTicker || '';

    var portfolioTickersArray = [], searchedTickersArray  = [];

    tickersPane.loadingTickersDone = false;

    switch(type) {
        case 'searched':
            ....
            break;

        case 'portfolio':

            if (portfolioCached) {
                // The API Call (cached)
                ApiFactory.getWatchList().then(function(data) {
                    portfolioTickersArray = renderTickers(data.data.tickers, undefined, type);
                    portfolioTickers.that = portfolioTickersArray;
                    tickersPane.loadingTickersDone = true;
                    console.log('portfolioTickersArray: ', portfolioTickersArray);
                    return portfolioTickersArray;
                });

            } else {
                // The API Call (not cached)
                ApiFactory.getWatchListRefresh().then(function(data) {
                    portfolioTickersArray = renderTickers(data.data.tickers, undefined, type);
                    portfolioTickers.that = portfolioTickersArray;
                    portfolioCached = true;
                    tickersPane.loadingTickersDone = true;
                    console.log('portfolioTickersArray: ', portfolioTickersArray);
                    return portfolioTickersArray;
                });
            }
            break;
    }

    function renderTickers(data, searchedTicker, type) {
        ....
    }
}

我使用，我相信我不应该使用，无论这一点，并找出如何使用的承诺，而不是getTickersFactory.js内返回数组功能：

function returnPortfolioTickers() {
    return portfolioTickers.that;
}

请注意我本来试试这个，但具有相同的结果：

Note I did originally try this, but with the same results:

vs.tickers = GetTickersFactory.getTickers('portfolio');

vs.tickers 将返回未定义

推荐答案

您开关的情况下应该返回的承诺，以便它调用函数将。然后调用时的承诺得到解决

Your switch cases should return a promise so that it caller function will .then called when promise gets resolved

厂code

function getTickers(type, load, searchedTicker) {
    //other code remains same
    tickersPane.loadingTickersDone = false;
    switch (type) {
        case 'searched':
            return ApiFactory.getTickers(null, load).then(function(data) {
                //other code remains same
                if (tickersPane.tempTickers.length > 0) {
                    //other code remains same
                    return returnData(searchedTickersArray);
                }
                return []; //return default variable to continue promise chain
            });
            break;
        case 'portfolio':
            tickersPane.addOption = false;
            tickersPane.removeOption = true;
            tickersPane.displayTopTags = false;
            tickersPane.displayPortfolio = true;

            if (portfolioCached) {
                return ApiFactory.getWatchList().then(function(data) {
                    //other code remains same
                    return returnData(portfolioTickersArray);
                });
            } else {
                return ApiFactory.getWatchListRefresh().then(function(data) {
                    //other code remains same
                    return returnData(portfolioTickersArray);
                });
            }
            break;
    }
    function renderTickers(data, searchedTicker, type) {
        //this should be as is
    }
    function returnData(data) {
        tickersPane.loadingTickersDone = true;
        return data;
    }
    //tickersPane.loadingTickersDone = true;
    //return data; //removed this line and move to function
}

控制器

if (root.tickerType === 'portfolio') {
    // Call to factory to start the API GETS:
    GetTickersFactory.getTickers('portfolio').then(resp){
         vs.tickers = GetTickersFactory.returnPortfolioTickers();
         console.log('portfolio');
         console.log('vs.tickers = ', vs.tickers);
    };
}