Firebase和app-indexeddb-mirror集成不起作用 [英] Firebase and app-indexeddb-mirror integration not working

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本文介绍了Firebase和app-indexeddb-mirror集成不起作用的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我试图用 app-indexeddb-mirror 元素来集成 Firebase 来缓存用户数据并将其传递当他离线的时候。



我已经在我的firebase数据库中列出了一个列出所有用户名字的元素,即使在离线时也是如此。

 < link rel =importhref =../ bower_components / polymer / polymer.html> 
< link rel =importhref =../ bower_components / polymerfire / polymerfire.html>
< link rel =importhref =../ bower_components / app-storage / app-indexeddb-mirror / app-indexeddb-mirror.html>

< dom-module id =firebase-test>
< template><! - {{{ - >
< style> / * {{{* /
< / style><! - }}} - >

< firebase-app
name =app
auth-domain =my-app.firebaseapp.com
database-url =https: //my-app.firebaseio.com
api-key =my-key>
< / firebase-app>

< app-indexeddb-mirror
key =teste
data ={{firebaseData}}
persisted-data ={{data} }
>< / app-indexeddb-mirror>

firebase-query
id =query
app-name =app
path =/ user
data = {{firebaseData}}>
< / firebase-query>

< template is =dom-repeatitems ={{data}}>
< h1> {{item.name}}< / h1>
< / template>

< / template><! - }}} - >

< script> // {{{
Polymer({
是:'firebase-test',
});
< / script><! - }}} - >
< / dom-module>

当我离线运行应用程序时,获取 App IndexedDB Client连接。 在控制台中,是什么让我怀疑当我离线时, app-network-status-behavior 无法发现。

解决方案

改变 app-network-status-behavior 我使用firebase系统来验证连接状态。

 <! -  
@license
版权所有(c)2016聚合物项目作者。版权所有。
此代码只能在http://polymer.github.io/LICENSE.txt找到的BSD样式许可证下使用
完整的作者集可以在http://polymer.github上找到.io / AUTHORS.txt
可以在http://polymer.github.io/CONTRIBUTORS.txt找到完整的贡献者集合
作为聚合物项目的一部分,由Google发布的代码也是
受限于http://polymer.github.io/PATENTS.txt中的额外知识产权授权
- >
< link rel =importhref =../ polymer / polymer.html>
< script>
(function(){
'use strict';

var networkStatusSubscribers = [];

firebase.database()。ref('。 ($ i = 0; i< networkStatusSubscribers.length; ++ i){
networkStatusSubscribers ['$' i] .refreshNetworkStatus(snap.val())
}
})

/ **
*`Polymer.appNetworkStatusBehavior`跟踪浏览器
*在线或离线,如果浏览器在线,则为true;如果浏览器为
*,则离线匹配HTML浏览器状态规范,否则为false
*
* @polymerBehavior
* /
Polymer.AppNetworkStatusBehavior = {
属性:{
/ **
*如果浏览器处于联机状态,则为true;如果浏览器处于脱机状态,则为false
*匹配HTML浏览器状态规范
*
* @type {Boolean}
* /
online:{
type:Boolean,
readOnly:true,
notify:true,
value:function(){
firebase.database()。ref('。info / connected ')
.once('value',function(snap){
return snap.val()
})
}
}
},

附加:function(){
networkStatusSubscribers.push(this);
this.refreshNetworkStatus();
},

detached:function(){
var index = networkStatusSubscribers.indexOf(this);
if(index <0){
return;
}
networkStatusSubscribers.splice(index,1);
},

/ **
*更新`online`属性以反映浏览器连接状态。
* /
refreshNetworkStatus:function(netStatus){
this._setOnline(netStatus);
}
};
})();
< / script>


I'm trying to integrate Firebase with app-indexeddb-mirror element to cache user data and deliver it when he's offline.

I ceated an element that should list the name of all users in my firebase database even when I'm offline.

<link rel="import" href="../bower_components/polymer/polymer.html">
<link rel="import" href="../bower_components/polymerfire/polymerfire.html">
<link rel="import" href="../bower_components/app-storage/app-indexeddb-mirror/app-indexeddb-mirror.html">

<dom-module id="firebase-test">
  <template><!--{{{-->
        <style>/*{{{*/
    </style><!--}}}-->

        <firebase-app  
            name="app"
            auth-domain="my-app.firebaseapp.com"
            database-url="https://my-app.firebaseio.com"
            api-key="my-key">
        </firebase-app>

        <app-indexeddb-mirror 
            key="teste"
            data="{{firebaseData}}"
            persisted-data="{{data}}"
        ></app-indexeddb-mirror>

        <firebase-query
            id="query"
            app-name="app"
            path="/user"
            data="{{firebaseData}}">
        </firebase-query>

        <template is="dom-repeat" items="{{data}}">
            <h1>{{item.name}}</h1>
        </template >

  </template><!--}}}-->

  <script>//{{{
    Polymer({
      is: 'firebase-test',
    });
  </script><!--}}}-->
</dom-module>

When I run the app offline I get the App IndexedDB Client connecting.. in the console, what makes me suspect that the app-network-status-behavior is failing to discover when I'm offline.

解决方案

Changing the app-network-status-behaviorworked. I'm using the firebase system to verify the connection status.

<!--
@license
Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
-->
<link rel="import" href="../polymer/polymer.html">
<script>
  (function() {
    'use strict';

    var networkStatusSubscribers = [];

    firebase.database().ref('.info/connected')
    .on('value',function(snap){
      for (var i = 0; i < networkStatusSubscribers.length; ++i) {
        networkStatusSubscribers[i].refreshNetworkStatus(snap.val())
      }
    })

    /**
     * `Polymer.appNetworkStatusBehavior` tracks the status of whether the browser
     * is online or offline. True if the browser is online, and false if the browser is
     * offline matching the HTML browser state spec.
     *
     * @polymerBehavior
     */
    Polymer.AppNetworkStatusBehavior = {
      properties: {
        /**
         * True if the browser is online, and false if the browser is offline
         * matching the HTML browser state spec.
         *
         * @type {Boolean}
         */
        online: {
          type: Boolean,
          readOnly: true,
          notify: true,
          value: function() {
            firebase.database().ref('.info/connected')
            .once('value',function(snap){
              return snap.val()
            })
          }
        }
      },

      attached: function() {
        networkStatusSubscribers.push(this);
        this.refreshNetworkStatus();
      },

      detached: function() {
        var index = networkStatusSubscribers.indexOf(this);
        if (index < 0) {
          return;
        }
        networkStatusSubscribers.splice(index, 1);
      },

      /**
       * Updates the `online` property to reflect the browser connection status.
       */
      refreshNetworkStatus: function(netStatus) {
        this._setOnline(netStatus);
      }
    };
  })();
</script>

这篇关于Firebase和app-indexeddb-mirror集成不起作用的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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