I started angularjs 2 days ago (...) I'm currently asking myself how to create a function that fetches my firebase data and depending on the child, it returns a string.

我2天前开始使用angularjs（...）我目前正在问自己如何创建一个获取我的firebase数据的函数，并根据子节点返回一个字符串。

Seems pretty simple when I say it, but harder to do...

我说的时候看起来很简单，但更难做到......

I could fetch the data one by one but the problem is that there are a total of 84 childs!!

我可以逐个获取数据，但问题是总共有84个孩子！

My Context The website retrieves from firebase if a person is working night, day or evening, for the 7 days of the week, for 4 weeks in a month (3x7x4 = 84). An example of one of my child is: Saturday1Night: true where "1" means week 1.

我的上下文如果一个人在一天中的7天工作，一天或晚上工作，一个月中的4周（3x7x4 = 84），网站将从firebase中检索。我孩子的一个例子是：Saturday1Night：true，其中“1”表示第1周。

What I tried

我尝试了什么

function getOneDay(currentUserId, key, query, text){
  firebase.database().ref().child('Users').child(currentUserId).child(key).once('value').then(function(snapshot) {
    /* query is "Saturday1Night" */
    if(datasnapshot.$value === null && datasnapshot.id === null) {
      /* not working */
      text = 'X';
    }else{
      /* value is "true", person is working */
      text = query;
    }

  })
  return text;
}

Now my real question is, how can I, like in java for example, create a function that returns a string? How can I display it in my $scope?

现在我真正的问题是，我怎么能像java一样创建一个返回字符串的函数？如何在$ scope中显示它？

html

HTML

{{s1n}}

angularjs

angularjs

$scope.s1n = text; //??
$scope.s1n = getOneDay(/*uid*/, /*key*/, "Saturday1Night", $scope.s1n) //??

Thank you in advance, have a good night/day!

提前谢谢，祝你有个美好的夜晚！

2 个解决方案

    async function getOneDay(currentUserId, key, query, text){

        var datasnapshot = await firebase.database().ref().child('Users').child(currentUserId).child(key).once('value');

        if(datasnapshot.$value === null && datasnapshot.id === null) {
          /* not working */
          text = 'X';
        }else{
          /* value is "true", person is working */
          text = query;
        }


      return text;
    }
    $scope.s1n = await getOneDay(/*uid*/, /*key*/, "Saturday1Night", $scope.s1n)