Firebase无限循环在my_added/set上插入我的项目

Question

我得到了一个将项目插入我的Firebase的无限循环，因此当我单击我的帖子表单时，它会插入我的项目，直到我终止该过程。你能帮我解决吗？

PS：我使用VueJS

  var usersRef = new Firebase('https://xxxxxxxxxxxxxxxxxx.firebaseio.com/userslist/'); 

      var vm = new Vue({ 
       el: '#list1', 
       data: function() { 
        return{ 
         // Initialisation du tableau de users 
         users: [], 
         sortKey: 'id', 
         reverse: 1, 
         nextKey: null 
        }; 

       }, 
       ready: function() { 
        // this works 
        //this.sortKey = 'name'; 
       }, 
       methods: { 
        updateUsers: function() { 
        }, 
        removeUser: function (item) { 
         usersRef.child(item.id).remove(); 
        }, 
        addItem: function (e) { 
         e.preventDefault(); 
         // get form data as Json 
         var jsonData = ConvertFormToJSON('form_add'); 
         //console.log(jsonData);//test ok 

         //get the last item id and save it to next key 

         usersRef.limitToLast(1).on('child_added', function (snapshot) { 
          var lastKey = parseInt(snapshot.key()); 
          this.nextKey = lastKey + 1; 
          console.log('nextKey ' + nextKey);//test ok 
          // 
          // save data to firebase 
          usersRef.child(this.nextKey).set(jsonData, function (snap) { 
          //console.log('add success');//test 
          //Notification par Jquery 
          var itemAdded = snap.val(); 
          $.notify(itemAdded.firstname + " " + itemAdded.name + " à été ajouté", "success", {position: "top right"}); 
          this.pendingKey = 0; 
          }); 
         }); 

        }, 
        // Tri des colonnes 
        sortBy: function (_sortKey) { 
         this.reverse = (this.reverse == -1) ? 1 : -1; 
         this.sortKey = _sortKey; 
         console.log("SortKey " + this.sortKey); 
        } 
       } 
      }); 


      usersRef.on('child_added', function (snapshot) { 

       var item = snapshot.val(); 
       item.id = snapshot.key(); 
       console.log('id ' + item.id); 

       vm.users.push(item); 

      }, function (errorObject) { 
       console.log("The read failed: " + errorObject.code); 
      }); 

感谢您的帮助

Answer 1

OK我已经找到了解决办法：

  //get the last item id and save it to next key 
      var _nextKey = this.nextKey; 
      usersRef.limitToLast(1).on('child_added', function (snapshot) { 
       var lastKey = parseInt(snapshot.key()); 
       _nextKey = lastKey + 1; 

      }); 
      this.nextKey = _nextKey; 
      console.log('nextKey ' + this.nextKey);//test ok 
      // save data to firebase 
      usersRef.child(this.nextKey).set(jsonData, function (snap) { 
       //console.log('add success');//test 
       //Notification par Jquery 
       var itemAdded = snap.val(); 
       $.notify(itemAdded.firstname + " " + itemAdded.name + " à été ajouté", "success", {position: "top right"}); 
      }); 

它可以帮助别人！