PHP jquery ajax实现即时聊天功能

时间：2015-01-23 来源：西部数据作者：西部数据

这是一个简单的利用jquery与php做的一个聊天室的源码,我们这里定时利用ajax读取数据库并进行刷新了,下面直接参上源码,实例代码如下:

//index.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>无标题文档</title>

<script src="http://code.jquery.com/jquery-1.9.1.min.js"></script>

<script>

var chat = {

init:function(){

  chat.first();

  $('#chat_btn').unbind('click').click(function(){

   chat.send();

  });

  $('#my_chat').keyup(function(){

   if(event.keyCode == 13){

    chat.send();

   }

  }); www.111cn.net

},

first:function(){

  $.getJSON('data.php',{

   action:'first',

   type:'l'

  },function(data){

   chat.btn_status._true();

   $('#mwebtime').html(data.time);

   $('#chat textarea').val(data.chat);

   $('#chat textarea').stop(true,true).animate({scrollTop:9999}, 1);

   chat.socket();

  });

},

send:function(){

  chat.btn_status._false();

  $.getJSON('send.php',{

   txt:$('#my_chat').val(),

   type:'l'

  },function(data){

   if(data.status==200){

    chat.btn_status._false();

    $('#my_chat').val('');

    setTimeout(function(){

     chat.btn_status._true();

    },2000);

   }

  });

},

socket:function(){

  $.getJSON('data.php',{

   action:'while',

   type:'l'

  },function(data){

   $('#mwebtime').html(data.time);

   $('#chat textarea').val(data.chat);

   $('#chat textarea').stop(true,true).animate({scrollTop:9999}, 1);

   chat.socket();

  });

},

btn_status:{

  _false:function(){

   $('#chat_btn').html('等待').attr('disabled',true);

  },

  _true:function(){

   $('#chat_btn').html('发言').attr('disabled',false);

  }

}

}

chat.init();

</script>

</head>



<body>

<div id="chat">

<textarea wrap="physical" style="line-height:20px;font-size:12px;height:100px;width:200px;"></textarea>

<BR />

<input id="my_chat" type="text" />

<button id="chat_btn" disabled="disabled">发言</button>

</div>

<div id="mwebtime"></div>

</body>

</html>

data.php

<?php

header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");

header("Last-Modified: ".gmdate("D, d M Y H:i:s")." GMT");

header("Cache-Control: no-cache, must-revalidate");

header("Pramga: no-cache");

set_time_limit(0);

$get = $_GET['action'];

$type = $_GET['type'];

$file = $type.'.txt';

if(isset($get) && isset($type) && file_exists($file)){

switch($get){

  case 'first':

   $chat = file_get_contents($file);

   $json=array(

    'status' => 200,

    'time' => gmdate("s"),

    'chat' => $chat,

   );

   echo json_encode($json);

   break; www.phpfensi.com

  case 'while':

   $oldsize = filesize($file);

   $newsize = filesize($file);

   while(true){

    if($oldsize!=$newsize){

     $chat = file_get_contents($file);

     $json=array(

      'status' => 200,

      'time' => gmdate("s"),

      'chat' => $chat,

     );

     echo json_encode($json);

     exit;

    }

    clearstatcache();

    $newsize = filesize($file);

    usleep(10000);

   }

   break;

}

}

?>

send.php

<?php

$json = array();

$txt = isset($_GET['txt'])?$_GET['txt']:'';

$type = isset($_GET['type'])?$_GET['type']:'';

if($txt!=''){

$file = $type.".txt";

if(file_exists($file)){

  $fp = fopen($file,"a");

  $str = "rn".'Admin：'.$txt;

  //$str = $txt."n"//linux;

  fwrite($fp, $str);

  fclose($fp);

  $json['status']=200;

  echo json_encode($json);

  exit;

}

}

?>