javascript - Set ajax call only when the new record inserted to database -

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i wants updated comment chat list page without refreshing page, thats have used ajax call list have call function every 5 seconds check whether new chat inserted or not database,

$(document).ready(function(){     setinterval(function(){         $.ajax({             type:'post',             url: baseurl+"chat",             cache: false,             data: datastring,             crossdomain: true,             success: function(data){                 var getdata = json.parse(data);                 if(getdata.status == "success")                 {                        for(i=0;i<getdata.chat.length)                     {                         $("chatlist").text("");                         $("chatlist").append("<span class='black'>"+getdata["chat"][i].name+" : <span class='blue'>"+getdata["chat"][i].comment+"</span>");                     }                 }                 else                 {                     alert(getdata.message);                 }              }         });     },5000); });

so wants know if there easy way or php mysql possible send page new comment inserted notification ?

you can use websocket, socket.io example. allow send notifications server client. so, when recieve data chat (cient) in api (server), after updating database, have send 'notification' client.

when client notification, can make ajax call : 

socket.on('notification', function(){   doyourajaxstuff(); });

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