php - Show chat window when new message received -

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i trying build chat system. problem when 1 user types message chat window won't display instantly message receiver. after receiver refreshes window works fine. here current code:

profile.php

setinterval(function(){     var username="<?php echo $username; ?>";     $.ajax({         url:"s/shower.php",         type:"post",         data:"shower=" + username,         success:function(data){                 if (data == 1){                     $(".pchat").show();                 }         }     }); },500);  $(".chat_wind").click(function(){     var id=$(this).attr("id");     var newid=id.split("chat_wind");     var datid=newid[1];      $(".pchat").show();  });   $(".chatform").submit(function(){     var parent=$(this).attr("id");     var split=parent.split("chatform");     var newid=split[1];      var val=$("#chati").val();     if (val.length == 0){         return false;     }      $.ajax({         url:"s/log.php",         type:"post",         data:"newid=" + newid + "&txt=" + val,         success:function(data){             setinterval(function(){                 $.ajax({                     url:"s/chat.php",                     type:"post",                     data:"username=" + newid,                     success:function(w){                          var objdiv = document.getelementbyid("cbody");                         objdiv.scrolltop = objdiv.scrollheight;                         $("#cbody").html(w);                     }                 });             },500);         }     });      $("#chati").val("");     return false; });

chat.php

<?php     include "db.php";     include "timeago.php";      if (isset($_post['username'])){         $username=$_post['username'];         $dat='';         $sql=mysql_query("select * chat uchated='$username' order time asc");         while($row=mysql_fetch_array($sql)){             $time=$row['time'];             $txt=$row['text'];              $dat.="                 <div id='msg'>                 $txt <div id='ctime'></div>                 </div>";          }         echo $dat;     }  ?>

shower.php

<?php     include "db.php";     if (isset($_post['shower'])){         $shower=$_post['shower'];          $sqlara=mysql_query("select * chat uchated='$shower'");          $numara=mysql_num_rows($sqlara);          if ($numara == 0){             echo "0";         }else{             echo "1";         }     } ?>

you need use websockets implement chat system. dont know php. can try link http://www.sanwebe.com/2013/05/chat-using-websocket-php-socket understand websocket programming


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