Javascript 发送消息时获取ID-Firebase&；角火_Javascript_Firebase_Firebase Realtime Database

Javascript 发送消息时获取ID-Firebase&；角火

javascript firebase

Javascript 发送消息时获取ID-Firebase&；角火,javascript,firebase,firebase-realtime-database,Javascript,Firebase,Firebase Realtime Database,我有一个消息“应用程序”，我需要在创建消息时获取ID。以下是所有代码： <html ng-app="sampleApp"> <body ng-controller="SampleCtrl"> <ul> <li ng-repeat="message in messages"> <input ng-model="message.message" ng-change="messages.$save

我有一个消息“应用程序”，我需要在创建消息时获取ID。以下是所有代码：

<html ng-app="sampleApp">

<body ng-controller="SampleCtrl">
    <ul>
        <li ng-repeat="message in messages">
            <input ng-model="message.message" ng-change="messages.$save(message)" />
            <input ng-model="message.by" ng-change="messages.$save(message)" />
            <button ng-click="messages.$remove(message)">Delete Message</button>
        </li>
    </ul>
    <form ng-submit="addMessage()">
        <input ng-model="newMessageText" />
        <input ng-model="newMessageBy" />
        <button type="submit">Add Message</button>
    </form>

    <!-- Angular -->
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.1/angular.min.js"></script>

    <!-- Firebase -->
    <script src="https://www.gstatic.com/firebasejs/3.6.6/firebase.js"></script>

    <!-- AngularFire -->
    <script src="https://cdn.firebase.com/libs/angularfire/2.3.0/angularfire.min.js"></script>
    <script>
        var config = {
            apiKey: "xxx",
            authDomain: "xxx",
            databaseURL: "xxx",
            projectId: "xxx",
            storageBucket: "xxx",
            messagingSenderId: "xxx"
        };
        firebase.initializeApp(config);
        var app = angular.module("sampleApp", ["firebase"]);
        app.controller("SampleCtrl", function ($scope, $firebaseArray) {
            var ref = firebase.database().ref().child("messages");
            $scope.messages = $firebaseArray(ref);
            $scope.addMessage = function () {

                $scope.messages.$add({
                    message: $scope.newMessageText,
                    by: $scope.newMessageBy
                });
            };
        });
    </script>
</body>

</html>

这是您如何获取id的方法

$scope.messages.$add({
                    message: $scope.newMessageText,
                    by: $scope.newMessageBy
                }).then(function(ref) {
                   var id = ref.key;
                  // do with the key what ever you want
})

然而，还有一个问题，我如何在每次更改某些内容时获取ID，或者在删除邮件时删除ID？请参见链接中的如何在不生成密钥的情况下将数据写入firebase，此处

$scope.messages.$add({
                    message: $scope.newMessageText,
                    by: $scope.newMessageBy
                }).then(function(ref) {
                   var id = ref.key;
                  // do with the key what ever you want
})