日期:2014-05-16  浏览次数:20781 次

Ajax的GET传值没问题,POST传值有问题!!!帮忙看看!!!!
如果把这些代码改成GET方式就正常,而用POST方式时,在gethint.php里就获取不到post传来的数据,这是怎么回事?帮忙看看,谢谢!

共三个文件,如下:

1. text.php
PHP code
<html>
<head>
<script src="clienthint.js"></script>
</head>
<body>
<form>
First Name:
<input type="text" id="txt1">
<input type="button" value="Submit" onClick="showHint()">
</form>
<p>Suggestions: <span id="txtHint"></span></p>
</body>
</html>



2.clienthint.js
PHP code
var xmlHttp
function showHint()
{
var str = document.getElementById("txt1").value;
if (str.length==0)
  {
  document.getElementById("txtHint").innerHTML="";
  return;
  }
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
  {
  alert ("Browser does not support HTTP Request");
  return;
  }
var url="gethint.php";
var content="qt="+str;
content=content+"&sid="+Math.random();
xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");//for post
xmlHttp.onreadystatechange=stateChanged;
xmlHttp.open("POST",url,true);
xmlHttp.send(content);
}

function stateChanged()
{
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
 {
 document.getElementById("txtHint").innerHTML=xmlHttp.responseText;
 }
}

function GetXmlHttpObject()
{
var xmlHttp=null;
try
 {
// Firefox, Opera 8.0+, Safari
 xmlHttp=new XMLHttpRequest();
 }
catch (e)
 {
 // Internet Explorer
 try
  {
  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  }
 catch (e)
  {
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
 }
return xmlHttp;
}



3. gethint.php
PHP code
<?php
// Fill up array with names
$a[]="Anna";
$a[]="Brittany";

$q = $_POST["qt"];
if (strlen($q) > 0)
{
$hint="";
for($i=0; $i<count($a); $i++)
  {
  if (strtolower($q)==strtolower(substr($a[$i],0,strlen($q))))
    {
    if ($hint=="")
      {
      $hint=$a[$i];
      }
    else
      {
      $hint=$hint." , ".$a[$i];
      }
    }
  }
}
else echo "q is empty!<br>";
//Set output to "no suggestion" if no hint were found
//or to the correct values
if ($hint == "")
{
$response="no suggestion";
}
else
{
$response=$hint;
}

//output the response
echo $response;
echo " to ";
echo $q;
echo "<br>";
?>



------解决方案--------------------
....
var url="gethint.php&"+new Date().getTime();
var content="qt="+str;
//content=content+"&sid="+Math.random();
xmlHttp.open("POST",url,true);
xmlHttp.onreadystatechange=stateChanged;
xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");//for post
xmlHttp.send(content);
....

function stateChanged(){
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){
if (xmlhttp.status==200||xmlhttp.status==0){
document.getElementById("txtHint").innerHTML=xmlHttp.responseText;
}
 }
}



------解决方案--------------------
把content加进去,别要那个true试试
------解决方案--------------------
就是加个时间戳,防止浏览器缓存

调试: