Detailed explanation of message push code using SignaiR and Push.js

ASP.NET SignalR is a library for ASP.NET developers that simplifies the process for developers to add real-time web functionality to their applications. Those who are interested can find out.

1. Use background

1. What is SignalR?

ASP.NET SignalR is a library for ASP.NET developers that simplifies the process of adding real-time web functionality to applications. A real-time web feature is a feature where server code can push content to a connected client as soon as it becomes available, rather than having the server wait for the client to request new data.

2.What is Push.js? [The browser needs to support H5Notifications]

Notifications is translated as notification. So what do Push.js notifications look like? See the picture below: most of them appear in the lower right corner of the screen.

Need permission:

3. Many times we can only use polling to display data. Update and message push. So I thought about whether there is a way to synchronize the client-side update when the server-side data is updated.

2. Start deploying a SignalR project [using mvc]

1. Create a new mvc project

........................

2. Import the program package [Vs2015]

Tools->NuGet Package Manager-> Package Management Console->Install-Package Microsoft.AspNet.SignalR->WaitingInstallationSuccessful

3. Create a new hub class

project->right-click->Add->New item->SignalR->SignalR permanent link class->Save->[Take MyConnection1 as Example] MyConnection1

 public class MyConnection1 : PersistentConnection
  {
    /// 

    /// 发送消息
    /// 
    /// 
    /// 
    /// 
    protected override Task OnConnected(IRequest request, string connectionId)
    {
      Debug.WriteLine(connectionId);
      return Connection.Send(connectionId, "Welcome!");//单推事列
    }

    /// 

    /// 接受客户端消息
    /// 
    /// 
    /// 
    /// 
    /// 
    protected override Task OnReceived(IRequest request, string connectionId, string data)
    {
      Debug.WriteLine(data);
      return Connection.Broadcast(data);//广播
    }
    /// 

    /// 掉线
    /// 
    /// 
    /// 
    /// 
    /// 
    protected override Task OnDisconnected(IRequest request, string connectionId, bool stopCalled)
    {
      Debug.WriteLine("掉线");
      return base.OnDisconnected(request, connectionId, stopCalled);
    }

    /// 

    /// 重连
    /// 
    /// 
    /// 
    /// 
    protected override Task OnReconnected(IRequest request, string connectionId)
    {
      Debug.WriteLine("重连");
      return base.OnReconnected(request, connectionId);
    }
  }

4. Create a new Owin Startup class[SignalR follows the Owin standard, Startup is the startup of the component, the Startup class will exist by default, just modify it]

We add the following code to the Configuration

public void Configuration(IAppBuilder app)
    {
      app.MapSignalR("/myconnection");
    }

Explanation: When accessing myconnection, MyConnection1 is triggered

5. Add client [h5]

@{
  ViewBag.Title = "Home Page";
  Layout = null;
}



  
  
  


  
  
  

6.Start the project Open the browser console, you will find the picture below, which means you have completed the first step.

7. Next we need to prepare push.js

Download address github.com/Nickersoft/push.js

8. Quote js

9. Create a new js push demo

  function push(data, url, img) {
    var imgurl = img != "" ? img : "../Images/icon.png";
    Push.create("新通知", {
      body: data,
      icon: imgurl,
      requireInteraction: true,
      onClick: function () {
        window.focus();
        this.close();
        window.location.href =url;
      }
    });
  }

Explanation: data: is the message content

url: The link entered by clicking on the notification

img: The picture address displayed for the notification

requireInteraction: When set to true, unless the user manually closes it Or click the notification, otherwise the notification will not close. If you need to set the disappearing time, please replace this attribute with timeout: 5000 in milliseconds

Other events Please read: www.npmjs.com/package/push.js

10. Combine the two

  //实时推送
  var conn = $.connection("/myconnection");

  conn.start().done(function (data) {
    console.log("已连接服务器,当前GUID为" + data.id);
  });

  //接受服务器的推送
  conn.received(function (msg) {
    console.log("服务器返回消息： " + msg);
    if (msg != "") {
      push(msg, "#", "")
    }
  });

11. The effect is as follows:

##12. Realize the active push of the server. Now we only introduce the broadcast. The principle of single push is the same.

It is divided into two modes: broadcast and single push.

Broadcast:

 var context = GlobalHost.ConnectionManager.GetConnectionContext();//获取你当前的Connection连接
  context.Connection.Broadcast("我是一条新的推送消息！");//广播推送

Single push:

 var context = GlobalHost.ConnectionManager.GetConnectionContext();//获取你当前的Connection连接
 context.Connection.Send(connectionId, "Welcome!");//单推事列

connectionId: is the GUID assigned by the server to each client

13. The effect is as follows:

In this way, when our server processes a certain task, we can call broadcast to actively push it to the client for instant update of data. and message push.

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