ajax的基础
去年也是这个时候，开始学了ajax，也是这个技术领我走上了网页制作的道路，于是这样感觉到手写html比之前的dw拖拖拽拽要有意思得多。
话不多说，下面是一个例子：
这个是ajax显示页面：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>##随笔</title>
<script type="text/javascript">
var xmlHttp;
/*创建对象函数*/
function GetXmlHttpObject()
{
var xmlHttp;
try
{
xmlHttp = new XMLHttpRequest();
}
catch(e)
{
try{
xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
}
catch(e){
try{
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
catch(e){
alert("ajax对象创建失败，请安装最新的浏览器。");
return false;
}
}
}
return xmlHttp;
}
/*状态改变函数*/
function stateChanged()
{
if(xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
{
document.getElementById("showArea").innerHTML += xmlHttp.responseText;
pauseButton();
}
}
/*刷新函数*/
function reflesh()
{
if(xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
{
document.getElementById("showArea").innerHTML = xmlHttp.responseText;
pauseButton();
}
}
/*显示新博文到页面上*/
function showNewBlog()
{
var title = document.getElementById("title").value;
var content = document.getElementById("content").value;
var action = document.getElementById("action").value;
if(content.length < 1 || content.length >52)
{
alert("内容长度必须大于1并且小于52。");
return;
}
if(title.length == 0)
title="无题";
xmlHttp = GetXmlHttpObject();
if(xmlHttp == null)
{
alert("你的浏览器有问题。");
return;
}
var url = "blog.php";
url = url+"?title="+encodeURIComponent(title);
url = url+"&content="+encodeURIComponent(content);
url = url+"&action="+action;
url = url+"&sid="+Math.random();
xmlHttp.onreadystatechange=stateChanged;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
}
function initialPage()
{
var action = "initial";
xmlHttp = GetXmlHttpObject();
if(xmlHttp == null)
{
alert("你的浏览器不支持Ajax。");
return;
}
var url = "blog.php";
url = url+"?action="+action;
url = url+"&sid="+Math.random();
xmlHttp.onreadystatechange=reflesh;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
}
function pauseButton()
{
document.getElementById("submit").disabled=true;
setTimeout("document.getElementById('submit').disabled=false",3000);
}
function deleteBlog(id)
{
var s = confirm("确定删除这篇随笔吗？");
if(s == true)
{
xmlHttp = GetXmlHttpObject();
if(xmlHttp == null)
{
alert("你的浏览器有问题。");
return;
}
var url = "blog.php";
var action= "delete";
url = url+"?id="+id;
url = url+"&action="+action;
url = url+"&sid="+Math.floor(Math.random()*100000);
xmlHttp.onreadystatechange=reflesh;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
}
else
return;
}
</script>
<style type="text/css">
.main{margin:0 auto; width:985px; font-family:"宋体";}
.clear{ clear:both;}
.form{margin-top:66px;}
.form textarea{}
.showArea{ }
.showArea div{ width:127px; height:160px; border:#000000 1px solid; overflow:hidden; float:left; margin-left:1px; margin-top:1px; cursor:pointer;}
.showArea h3{ font-size:14px; font-weight:bold; background:#CCCCCC; border-bottom:#666666 1px solid;margin:0px; padding:0px; text-align:center; line-height:20px;}
.showArea p{ font-size:12px; text-indent:2em; text-decoration:underline; line-height:18px; margin:3px 3px 0px 3px;}
.showArea i{ font-size:10px; margin-top:18px; text-align:right; margin-right:3px; display:block;}
.showArea span{ font-size:10px; display:block; float:right; margin-right:2px;}
</style>
</head>
<body>
<div class="main">
<div id="showArea" class="showArea"></div>
<div class="clear"></div>
<div class="form">
<form name="edit" id="edit" class="edit">
标题：<input type="text" size="30" id="title" maxlength="6" /><br />
<textarea rows="6" cols="40" id="content"></textarea><br />
<input type="hidden" id="action" value="add" />
<input type="button" id="submit" value="发随笔" onclick="showNewBlog()" />
</form>
</div>
</div>
<script type="text/javascript">
initialPage();
</script>
</body>
</html>
这个是服务端代码以及数据库结构:blog.php
<?php
/*数据表
--
-- 表的结构 `lewyblog`
--
CREATE TABLE `lewyblog` (
`id` int(11) NOT NULL auto_increment,
`title` varchar(20) default NULL,
`content` varchar(70) default NULL,
`dateline` int(11) default NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
*/
/********************************/
//数据库配置部分
$db_host="115.*.*.*";
$db_user="dbuser";
$db_password="dbpass";
$db_name="dbnme";
/********************************/
$con = mysql_connect($db_host,$db_user,$db_password);
mysql_select_db($db_name,$con);
mysql_query("set names utf8");
/****************Fuction Start********************/
function display_one_blog($id=1)
{
$sqlstr = "select * from lewyblog where id=".$id;
$res = mysql_query($sqlstr);
while($arr = mysql_fetch_array($res))
{
$content = "<div id='".$arr['id']."'><h3><span id='".$arr['id']."' onclick='deleteBlog(this.id)'>×</span>".$arr['title']."</h3><p>".$arr['content']."</p><i>".date("y-m-d H:i",$arr['dateline'])."</i></div>";
}
return $content;
}
function initial()
{
$sqlstr = "select * from lewyblog order by dateline asc";
$res = mysql_query($sqlstr);
$content = "";
while($arr = mysql_fetch_array($res))
{
$content .= "<div id=".$arr['id']."><h3><span id='".$arr['id']."' onclick='deleteBlog(this.id)'>×</span>".$arr['title']."</h3><p>".$arr['content']."</p><i>".date("y-m-d H:i",$arr['dateline'])."</i></div>";
}
return $content;
}
function display_new_blog()
{
$sqlstr = "select * from lewyblog order by dateline desc limit 1";
$res = mysql_query($sqlstr);
while($arr = mysql_fetch_array($res))
{
$content = "<div id=".$arr['id']."><h3><span id='".$arr['id']."' onclick='deleteBlog(this.id)'>×</span>".$arr['title']."</h3><p>".$arr['content']."</p><i>".date("y-m-d H:i",$arr['dateline'])."</i></div>";
}
return $content;
}
function insert_new_blog($title="",$content="")
{
$sqlstr = "insert into lewyblog (title, content, dateline) values('$title','$content',".time().")";
$res = mysql_query($sqlstr);
if(!$res)
{
return false;
}
else
return true;
}
function deleteBlog($id=0)
{
if(!$id)
{
return;
}
$sqlstr = "delete from lewyblog where id=".$id;
$res = mysql_query($sqlstr);
return;
}
/************************Function End**************************************/
if($_GET["action"]=="add")
{
$title = $_GET["title"];
$content = $_GET["content"];
if(insert_new_blog($title,$content))
{
echo display_new_blog();
}
else
{
die("插入数据库失败");
}
}
elseif($_GET["action"]=="initial")
{
echo initial();
}
elseif($_GET["action"]=="delete")
{
$id = $_GET["id"];
deleteBlog($id);
echo initial();
}
else
{
die("非法操作");
}
?>
收藏于 2009-02-23
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