Even if you have your application fully cached, you couldn’t perform any external request without internet connection. That’s why in order to build an offline-capable application, you must know when it’s actually offline.

This lesson shows you how to use the NavigatorOnLine API and online/offline events in order to disable the functionality to send messages of the application.

    this.online = navigator.onLine

    window.addEventListener('online', () => (this.online = true))

    window.addEventListener('offline', () => {

      this.online = false

    })

[PWA] Check Online Status by using the NavigatorOnLine API的更多相关文章

  1. DTM initialization: failure during startup recovery, retry failed, check segment status (cdbtm.c:1603)

    安装greenplum集群出现以下错误: 20160315:13:49:16:025696 gpinitsystem:h95:jason-[INFO]:-Checking configuration ...

  2. check failed status == cudnn_status_success (4 vs. 0) cudnn_status_internal_error

    Check failed: error == cudaSuccess (30 vs. 0) unknown error  这个有可能是显存不足造成的,或者网络参数不对造成的 check failed ...

  3. 关于Failed to check the status of the service com.taotao.service.ItemService. No provider available fo

    原文:http://www.bubuko.com/infodetail-2250226.html 项目中用dubbo发生: Failed to check the status of the serv ...

  4. Check failed: status == CUBLAS_STATUS_SUCCESS (11 vs. 0) CUBLAS_STATUS_MAPPING_ERROR

    I0930 21:23:15.115576 30918 solver.cpp:281] Learning Rate Policy: multistepF0930 21:23:17.263314 310 ...

  5. java.lang.IllegalStateException: Failed to check the status of the service

    java.lang.IllegalStateException: Failed to check the status of the service com.pinyougou.sellergoods ...

  6. CUDA报错： Cannot create Cublas handle. Cublas won't be available. 以及：Check failed: status == CUBLAS_STATUS_SUCCESS (1 vs. 0) CUBLAS_STATUS_NOT_INITIALIZED

    Error描述: aita@aita-Alienware-Area-51-R5:~/AITA2/daisida/ssd-github/caffe$ make runtest -j8 .build_re ...

  7. node js fcoin api 出现 api key check fail : {"status":1090,"msg":"Illegal API signature"}

    //主区://ft / btc 不支持市价 买入数量不能小于5个FT 买//ft / eth 支持市价 最小买入eth不能小于0.01 买//ft / usdt 支持市价 最小买入usdt不能小于10 ...

  8. dubbo Failed to check the status of the service com.user.service.UserService. No provider available for the service

    Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'u ...

  9. 14 - How to check replication status

    The people using PostgreSQL and the Streaming Replication feature seem to ask many of the same quest ...

随机推荐

  1. RAP接口文档的安装

    本机环境 系统:CentOS 6.7 64 位 MySQL 5.6 JDK 1.8 Tomcat 8 Redis 3.0.7 Rap 0.14.1 Rap 说明 官网:https://github.c ...

  2. Android内存管理（10）MAT： 基本教程

    原文: http://help.eclipse.org/mars/index.jsp?topic=%2Forg.eclipse.mat.ui.help%2Fgettingstarted%2Fbasic ...

  3. JSP执行原理图

  4. [转]linux之pr命令

    转自:http://www.bitscn.com/plus/view.php?aid=6638 本文介绍如何使用Linux的pr命令将大文件分割成多个页面进行打印,并在每个页面上加上标题. Linux ...

  5. java heap 异常

    近期,项目每运行一周之后就会堆异常, java.lang.OutOfMemoryError: Java heap space,导致应用中断. 解决办法:将堆内存修改大一点. 从性能优化工具中可以看到修 ...

  6. [ SHOI 2014 ] 概率充电器

    \(\\\) \(Description\) 一个含\(N\)个元器件的树形结构充电器,第\(i\)个元器件有\(P_i\)的概率直接从外部被充电,连接\(i,j\)的边有\(P_{i,j}\)的概率 ...

  7. Android开发初体验

    本文通过开发一个应用来学习Android基本概念及构成应用的UI组件. 开发的应用名叫GeoQuiz,它能给出一道道地理知识问题.用户点击true或false按钮回答问题,应用即时做出反馈 第一步请先 ...

  8. 微信开发配置JSSDK，注入权限验证，以及invalid signature签名错误解决

    在微信开发中很多功能都要用到微信JSSDK,关于JSSDK的使用,微信官方的文档已经比较详细,一定要仔细去看文档. <script src="https://res.wx.qq.com ...

  9. IOS7升级攻略

    1) Select the main view, set the background color to black (or whatever color you want the status ba ...

  10. Mysql命令mysql：连接Mysql数据库

    mysql命令格式: mysql -h主机地址 -u用户名 -p用户密码 1) 连接到本机上的MYSQL首先打开DOS窗口,然后进入目录mysql\bin,再键入命令mysql -u root -p, ...