在设置firebase ionic 3的数据后获得响应

Question

以下代码用于设置firebase数据库上的数据。我想知道如何在设置firebase后成功保存详细信息？

//get current time fire base
getCurrentDate() {
//Client Meeting model
let oCurrentDateModel = new current_date_model();
oCurrentDateModel.current_date_time_stamp = firebase.database.ServerValue.TIMESTAMP;
return new Promise<any>((resolve, reject) => {
this.oAngularFireDatabase.database.ref('/Settings')
.child('CurrentDate')
.set(oCurrentDateModel)
.then(
data => {
//THIS DATA IS UNDEFINED
//HERE I WANT TO GET SAVED current_date_time_stamp
console.log(data);
//Alert Generation
this.oAlertProvider.showAlert('Success', "Updated Successful");            
},
err => {
reject(err);
//Alert Generation
this.oAlertProvider.showAlert('Error', err.message);
})
})
}

Answer 1

要获得服务器端时间戳的值，您必须附加一个侦听器：

let timestampRef = this.oAngularFireDatabase.database.ref('/Settings/CurrentDate/current_date_time_stamp');
let timestampListener = timestampRef.on("value", function(snapshot) {
if (snapshot.exists()) {
console.log(snapshot.val());
timestampRef.off("value", timestampListener);
}
});

一旦监听器获得时间戳值，这段代码也会删除它。