First knowledge of WebSocket

Last Update:2018-08-16 Source: Internet

Author: User

Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

Instant Messaging

Plainly, yes.

Establish connection/Receive message/Send Message

But there's a lot of scrutiny.

Here is a simple demo

<!DOCTYPE HTML><HTML>    <Head>        <MetaCharSet= "UTF-8">        <Metaname= "Viewport"content= "initial-scale=1, maximum-scale=3, minimum-scale=1, User-scalable=no">        <title></title>        <Linkrel= "stylesheet"href= "Css/base.css" />        <Scripttype= "Text/javascript"src= "Js/websocket.js"></Script>    </Head>    <Body>        <Divclass= "Wrap">            <Divclass= "Sideleft">                <H1>Online personnel</H1>                <ul>                    <Li>                        <Divclass= "Headimg"></Div>                        <span>18768875722</span>                    </Li>                    <Li>                        <Divclass= "Headimg"></Div>                        <span>15277365552</span>                    </Li>                </ul>            </Div>            <Divclass= "Sideright">                <DivID= "Liao">                    <Div>                        <Divclass= "Headimg"></Div>                        <Divclass= "AAA">Hello, Mr. B.</Div>                    </Div>                    <Divstyle= "float:right;">                        <Divclass= "BBB"ID= "Me">Score and health</Div>                        <Divclass= "Headimg"></Div>                    </Div>                </Div>                <Divclass= "Connect">                    <Div>                        <inputtype= "text"style= "height:40px;width:180px;"ID= "Content" />                    </Div>                    <Div>                        <inputtype= "text"ID= "num"style= "position:absolute;bottom:10px;right:140px;" />                        <Buttonclass= "DL"onclick= "Connect ()">Login</Button>                        <Buttonclass= "QL"onclick= "Send ()">Group Chat</Button>                        <Buttonclass= "SL">Private chat</Button>                    </Div>                </Div>            </Div>            <!--<div id= "Logs" ></div> -        </Div>        <Script>        </Script>    </Body></HTML>

The interface is as follows

Here is the WebSocket code, can achieve the effect is, first login with the account, and then open Group chat or private chat

var Curuser, username, socket; function Connect () {    = document.getElementById ("num"). Value;     if (curuser) {        alert ("Currently logged in, please log out first!") );         return ;    }

Instead of the IP you need

varip = "106.00.0.000";
    varPort = 8888; varPassword = "123"; Socket =NewWebSocket ("WS:" + IP + ":" + Port + "? username=" + Username + "&password=" +password); Socket.onopen=function(e) {Console.log ("Successful Landing"); varUsercmd = "{\" cmd\ ": 17,\" type\ ": \" 0\ ", \" userid\ ": \" + username + "\"} "; Socket.send (Usercmd); //get login user information;    }; Socket.onerror=function(e) {Console.log ("Login Exception");    Console.log (E.message)}; Socket.onmessage=function(e) {vardata = eval ("(" +e.data+ ")"); varContentdata = eval ("(" +data.data+ ")"); //Receive Message triggering        if(Data.command = = "Command_chat_resp" & contentdata.from! =username) {Console.log ("Received successfully"); document.getElementById ("Liao"). InnerHTML + = "<br/><div><div class= ' headimg ' ></div><div class= ' aaa ' >" + contentdata.content+ "</div></div>"; }    }}varonselected;//sending MessagesfunctionSend () {varToid = ""; if(onselected) {toid= "1876887572210"; }    varCreatetime =NewDate (). GetTime (); varContent = document.getElementById (' content '). Value; if(Content = = "")        return;
Group Chat Codevarmsg = "{\" from\ ": \" "+username+" \ ", \" createtime\ ":" +createtime+ ", \" cmd\ ": 11,\" group_id\ ": \" 100\ ", \" chattype\ ": \" 1 \ ", \" msgtype\ ": \" text\ ", \" content\ ": \" "+content+" \ "}";
Private chat Code
varmsg = "{\" from\ ": \" "+ Username +" \ ", \" to\ ": \" "+ toid +" \ ", \" cmd\ ": 11,\" createtime\ ":" + createtime + ", \" msgtype\ ": \ "Text\", \ "content\": \ "" + Inputvalue + "\"} ",

socket.send (msg);     var chatobj = eval ("(" + msg + ")");    Console.log (chatobj);     // document.getElementById ("Me"). InnerHTML = chatobj.content;    document.getElementById ("Liao"). InnerHTML + = "<br/><div style= ' float:right; ' ><div class= ' bbb ' id= ' me ' > ' +chatobj.content+ ' </div><div class= ' headimg ' ></div></div > ";     var createtime = "2017-10-20";    document.getElementById (' content '). Value = "";}

Initial WebSocket

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

Sales Support

1 on 1 presale consultation

Chat Contact Sales
After-Sales Support

24/7 Technical Support 6 Free Tickets per Quarter Faster Response

Open a Ticket
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

Learn More

First knowledge of WebSocket

Contact Us

A Free Trial That Lets You Build Big!

Sales Support

After-Sales Support