嗨，我是firebase的新手，并试图开发一个聊天应用程序，除了在用户切换到pm不同的用户时复制发送方面板上的数据之外，一切看起来都很好，并且在他/她回到以前的用户之后，它也复制了那个人的聊天。虽然它不存储在firebase数据库，这也很奇怪…副本从1开始，然后如果用户再次切换到其他用户/s，则副本将增加
这是聊天应用程序的整个firebase代码这是presence和聊天教程的组合我只是对它做了一点修改我不知道是哪个脚本导致了这个重复的
// Reference for tbl message
var messagesRef = new Firebase('https://url-for-tablemessage');
// Reference for tbl userprofile
var userListRef = new Firebase("https://url-for-userprofile");
var myUser = userListRef.child(idf);
// Get a reference to my own presence status.
var connectedRef = new Firebase("https://url-for-userprofile//.info/connected");
function getmsg(){
// Loads Previous Message with the selected user/s.
messageList.html("");
messagesRef.limit(10).on('child_added', function (snapshot) {
//GET DATA
var data = snapshot.val(), username = data.name, message = data.text,
sendr = data.sender, recievr = data.reciever, ui = $('#chat-avatar').attr("data-ui"),
style_c = "";
if (username != nameField){ style_c = "message chat";}
else{ style_c = "message user"; }
var messageElement = $('<div class="'+style_c+'"><div class="message-info">'+
'<img width="40" height="40" src="temp/user/'+username+'.jpg">' +
'<div class="message-timestamp">' +
' <time datetime="" class="timeago uk-text-small">09:22 am</time>' +
'</div></div>' +
' <div class="message-data">' +
' <div class="bubble"></div></div></div>');
if (((idf == sendr) && (ui == recievr) )||((idf == recievr) && (ui == sendr) )){
messageElement.find('.bubble').html(message).emoji();
//ADD MESSAGE
messageList.append(messageElement);}
//SCROLL TO BOTTOM OF MESSAGE LIST
messageList[0].scrollTop = messageList[0].scrollHeight;
});
}
// A helper function to let us set our own state.
function setUserStatus(status) {
// Set our status in the list of online users.
currentStatus = status;
myUser.set({ id:idf, names: name, firstname:fname, lastname:lname, status: status });
}
function getMessageId(snapshot) {
return snapshot.name().replace(/[^a-z0-9-_]/gi,'');
}
// Update our GUI to show someone"s online status.
userListRef.on("child_added", function(snapshot) {
var user = snapshot.val();
if (user.names != name) {
$("<a />")
.attr({"id": getMessageId(snapshot),"data-username":user.names,"data-fname":user.firstname,"data-lname":user.lastname})
.html(user.names + "<br />")
.appendTo("#presenceDiv")
.click(function(){
var dt = $(this).attr("data-username"),df=$(this).attr("data-fname"),dl=$(this).attr("data-lname"),
src="temp/user/"+dt+".jpg";
$('#chat-avatar').show();
$('#chat-avatar').attr({'src':src,"data-os":user.status,"data-ui":user.id})
$('#chat-name').html(df + " " + dl);
console.log(dt);
messageList.html("");
getmsg();
});
$("<li />")
.attr({"id": getMessageId(snapshot),"data-username":user.names,"class":"offcanvas-chat-avatar","data-fname":user.firstname,"data-lname":user.lastname})
.html("<small id='ofstat' data-os="+user.status+" data-ui="+user.id+" ></small><img width='40' height='40' src='temp/user/"+user.names+".jpg'>"+ user.names )
.appendTo("#clist")
.click(function(){
var dt = $(this).attr("data-username"),df=$(this).attr("data-fname"),dl=$(this).attr("data-lname"),
src="temp/user/"+dt+".jpg";
$('#chat-avatar').show();
$('#chat-avatar').attr({'src':src,"data-os":user.status,"data-ui":user.id});
$('#chat-name').html(df + " " + dl);
console.log(dt);
messageList.html("");
getmsg();
});
}
});
// LISTEN FOR KEYPRESS EVENT
messageField.keypress(function (e) {
if (e.keyCode == 13) {
//FIELD VALUES
//messageList.html("");
var username = nameField;
var message = messageField.val();
var ui = $('#chat-avatar').attr("data-ui");
if(message != ""){
//SAVE DATA TO FIREBASE AND EMPTY FIELD
messagesRef.push({name:username, text:message, sender:idf, reciever:ui});
}else{
alert("Text Field Empty");
}
//getmsg();
messageField.val('');
e.preventDefault();
// return false;
}
});
我真的需要这个来继续工作。被困在这里近3周，现在我不确定我所做的是否实际上是正确的，因为这一点，但我可以说的是，我认为错误在于getmsg()函数不确定，虽然…
当消息来自当前经过身份验证的用户时，您是否试图以不同的方式格式化消息?这就是调用getMsg()的原因吗?
我会给你另一种思考方式，因为这是我设法做到的，我没有这个错误。我认为你的错误是来自于这样一个事实:无论你是否调用getMsg()，都可能调用。on('child_added')。
我的解决方案包括以下
messagesRef.limit(msgLimit).on('child_added', function (snapshot) {
var message = snapshot.val();
//format timestamp from linux epoch to readable format
var ts = getTimestamp(message.timestamp);
//gets the image from the user who sent the message
var userImg = userSnapshot.child(message.userID).child('img').val();
//variables for message layout
var chatMsgImg = $('<img>',{class:'avatar', src:userImg});
var chatMsgDiv = $('<div/>',{class:'message'});
var chatMsgArrow = $('<span/>', {class:'arrow'});
var chatMsgName = $('<span/>', {class:'name'}).text(message.from);
var chatMsgTimestamp = $('<span/>', {class:'datetime'}).text(' '+ts);
var chatMsgContent = $('<span/>', {class:'body'}).text(message.text);
//if the message is from the currently signed in user, then align right and use class out
if((message.userID) == userID){
var msg = $('<li/>', {class:'out'});
msg.append(chatMsgImg);
chatMsgDiv.append(chatMsgArrow);
chatMsgDiv.append(chatMsgName);
chatMsgDiv.append(chatMsgTimestamp);
chatMsgDiv.append(chatMsgContent);
msg.append(chatMsgDiv);
msg.appendTo($('#chatDiv'));
}
//otherwise align left and use class in
else{
var msg = $('<li/>', {class:'in'});
msg.append(chatMsgImg);
chatMsgDiv.append(chatMsgArrow);
chatMsgDiv.append(chatMsgName);
chatMsgDiv.append(chatMsgTimestamp);
chatMsgDiv.append(chatMsgContent);
msg.append(chatMsgDiv);
msg.appendTo($('#chatDiv'));
}
$('#chatDiv')[0].scrollTop = $('#chatDiv')[0].scrollHeight;
});
通过这种方式，我仍然可以获得相同的消息详细信息，但是我将格式化留给CSS，只需使用in和out或传入和传出消息(分别来自其他用户和当前用户)