实现一个无刷新的基于ajax的简易聊天室

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Ajax PHP JavaScript 脚本 HTML

实现一个基于ajax的简易聊天室

1 程序主页面

<html>
<head>
<title>在线交流对话</title>
<META http-equiv=Content-Language content=zh-cn>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<?php
include_once("server1.server.php"); #servidor para XAJAX
$xajax->printJavascript();
?>

</head>
<body>
<div id=display>

</div>

<div id=speak>
<form id="speakForm" action="javascript:void(null);" onsubmit="onSubmit();">
<fieldset>
<legend>Please into your words here!</legend>
<label>Speak:</label>
<input type="text" name="words" id="words" size="40" maxlength="150" />
<input type="submit" value="enter"> //点击按钮时提交
<input type="hidden" name="nick" id="nick" value="guest" />
</fieldset>
</form>
</div>

</body>
</html>

2 脚本

-- 聊天室
CREATE TABLE TBL_CHAT (
nick varchar(10) NOT NULL default '',
words varchar(150) NOT NULL default '',
chattime bigint(20) unsigned NOT NULL default '0'
) TYPE=MyISAM;

3 服务器端

<?php
include 'include.php';
require("xajax.inc.php");

//extend response
class myXajaxResponse extends xajaxResponse
{
function addAddOption($sSelectId, $sOptionText, $sOptionValue)
{
    $sScript = "var objOption = new Option('".$sOptionText."','".$sOptionValue."');";
    $sScript .= "document.getElementById('".$sSelectId."').options.add(objOption);";
    $this->addScript($sScript);
}

function addClearSelect($sSelectId)
{
    $sScript .= "document.getElementById('".$sSelectId."').options.length = 0;";
    $sScript .= "document.getElementById('".$sSelectId."').options.selectedIndex = 0;";
    $this->addScript($sScript);
}
}

//显示留言的函数

function reloaddisplay(){
global $db,$now;

$objResponse = new xajaxResponse();
$tmp="";

$chats = $db->getAll($db->modifyLimitQuery("select * from ".TBL_CHAT." order by chattime desc", 0, 15));
for ($i = 0, $count = count($chats); $i < $count; $i++) {
   $tmp.= $chats[$i]['nick'].":".$chats[$i]['words']."<br>";
}

//Delete old data 只保留15条信息
$nr = $db->getOne("select count(*) from ".TBL_CHAT);
if($nr > 15) {
   $delnr = $nr - 15;
    $db->query("delete from TBL_CHAT order by chattime asc limit $delnr)");
}

$objResponse->addAssign("display","innerHTML",$tmp);
return $objResponse->getXML();

}

//无提交表单程序，特别注意这里需要用iconv还原url的编码

function speak($formData){
global $db,$now;
$objResponse = new xajaxResponse();

$words = iconv("UTF-8","GBK",$formData['words']);
$nick = iconv("UTF-8","GBK",$formData['nick']);

if(strlen($words) > 0 && strlen($nick) > 0) {
$db->query("insert into ".TBL_CHAT." (nick, words,chattime) values ("
                  .$db->quote(stripslashes($nick)).", "
                  .$db->quote(stripslashes($words))
                  .", '$now')");
}
$objResponse->addClear("words","value");

return $objResponse->getXML();
}

$xajax = new xajax("server1.server.php","xajax_",false);
$xajax->registerFunction("reloaddisplay");
$xajax->registerFunction("speak");
$xajax->processRequests();
?>

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