AJAX 实时读取输入文本(php)

作者: 优柔寡断你二舅
来源: 51数据库
2021-08-21

客户端代码：

复制代码代码如下:

 
<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd"> 
<html xmlns="http://www.51sjk.com/Upload/Articles/1/0/270/270311_20210708032810246.jpg"> 
<head> 
<meta http-equiv="content-type" content="text/html; charset=utf-8" /> 
<title>无标题文档</title> 
</head> 
<script language="javascript"> 
var xmlhttp; 

function createxmlhttprequest(){ 
if(window.activexobject){ 
xmlhttp = new activexobject("microsoft.xmlhttp"); 
} 
else if(window.xmlhttprequest){ 
xmlhttp = new xmlhttprequest(); 
} 

} 

function sendrequest(){ 

createxmlhttprequest(); 

var name = document.getelementbyid("name").value; 
url = "string_check.php?page="+name; 
xmlhttp.onreadystatechange = callback; 
xmlhttp.open('get',url,true); 
xmlhttp.send(null); 
} 

function callback(){ 
if(xmlhttp.readystate == 4){ 
if(xmlhttp.status == 200){ 
document.getelementbyid("show").innerhtml = "您输入的字符串为："+ xmlhttp.responsetext; 

} 
} 
} 

</script> 
<body> 
<p>ajax test;</p> 
<p><br/> 
<input type="text" id="name" onkeyup="sendrequest();" /> 
<br/> 
<span id="show"></span> 
</p> 
</body> 
</html> 

服务器端代码：

复制代码代码如下:

 
<?php 
header('content-type: text/html;charset=utf-8'); 
$ename = $_get["page"]; 
if ($ename == "") { 
$ename = "请输入："; 
} 
echo ($ename); 
exit(0); 
?> 