Question

我有一个以数字方式组织的列表/对象数组，我将对象名称视为＆＃39; id＆＃39;。我正在使用firebase，我无法弄清楚如何获取id号本身。任何帮助都会很棒

//js
  myFirebaseRef.once("value", function(snapshot) {
   var list = snapshot.val();
    $scope.items = list
     console.log($scope.items)
  })
//log $scope.items
[1: Object, 2: Object, 3: Object, 4: Object, 5: Object, 6: Object, 7: Object //...

Answer 1

与angular.forEach类似，你可以做一些事情：

angular.forEach($scope.items,function(key,value){
   //the key will contain your id
   console.log(key);
})

Answer 2

这是你要找的吗？

myFirebaseRef.once("value", function(snapshot) {
  //var list = snapshot.val();
  snapshot.forEach(function(itemSnapshot) {
    console.log(itemSnapshot.key); // if you're using 2.x that is key()
  });
})

Answer 3

喜欢这个。您可以使用obj[key] = value;为变量设置id。

function update(node,key,value){
    var ref = firebase.database().ref('/');
    var obj = {};
    obj[key] = value;
    ref.child(node).update(obj)
    .then(function() {
        console.log('Update Ran Successfully');
    });       
}

Answer 4

这是一个真实的示例，使用react和axios检索firebase中对象的名称：

componentDidMount() {
    axios.get('/uri.json')
        .then(res => {
            let fetchedData = [];
            for (let key in res.data) {
                fetchedData.push({
                    ...res.data[key],
                    id: key //The key here holds the object's name !
                });
            }
        });
}

检索firebase中对象的名称

4 个答案: