getElementsByTagName问题求解
<html><head><?php $username=$_GET['username']; $username=trim($username);//去掉空格 session_start(); $loginuser=$_SESSION['loginuser'];?><meta http-equiv="content-type" content="text/html;charset=utf-8"/><script src="my.js"></script><script> window.resizeTo(500,400); window.setInterval("getMessage()",5000); function getMessage(){ var myXmlHttpRequest=getXmlHttpObject(); if(myXmlHttpRequest){ var url="GetMessageControl.php"; var data="getter=<?php echo $loginuser; ?>&sender=<?php echo $username; ?>"; myXmlHttpRequest.open("post",url,true); myXmlHttpRequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); //重点。指定处理结果的 函数 myXmlHttpRequest.onreadystatechange=function (){ if(myXmlHttpRequest.readyState==4){ if(myXmlHttpRequest.status==200){ var mesRes=myXmlHttpRequest.responseXML; var cons=mesRes.getElementsByTagName("con"); var sendTimes=mesRes.getElementsByTagName("sendTime"); window.alert(cons.length); if(cons.length!=0){ for(var i=0;i<cons.length;i++){ $('mycons').value+="<?php echo $username; ?>对<?php echo $loginuser; ?>说："+cons[i].childNodes[0].nodeValue+" "+sendTimes[i].childNodes[0].nodeValue; } } } } } myXmlHttpRequest.send(data); } } function sendMessage(){ var myXmlHttpRequest=getXmlHttpObject(); if(myXmlHttpRequest){ var url="SendMessageControl.php"; //js中使用php数据 var data="con="+$('con').value+"&getter=<?php echo $username; ?>&sender=<?php echo $loginuser; ?>"; window.alert(data); myXmlHttpRequest.open("post",url,true); myXmlHttpRequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); myXmlHttpRequest.onreadystatechange=function (){ if(myXmlHttpRequest.readyState==4){ if(myXmlHttpRequest.status==200){ } } } myXmlHttpRequest.send(data); } }</script></head><center><h1 id="聊天室-您正在和-font-nbsp-color-red-php-nbsp-echo-nbsp-username-nbsp-font-聊天">聊天室（您正在和<font color="red"><?php echo $username; ?></font>聊天）</h1> <textarea cols="30" rows="10" id="mycons"></textarea><br> <input type="text" style="width:200px" id="con"> <input type="button" value="send" onclick="sendMessage()"></center></html><?php include 'SqlHelper.class.php'; class MessageService{ //将数据信息添加到数据库 function addMessage($sender,$getter,$con){ $sql="insert into message (sender,getter,content,sendTime) values('$sender','$getter','$con',now())"; // file_put_contents("d:/test.txt","sql=".$sql."\r\n",FILE_APPEND); $sqlHelper=new SqlHelper(); return $sqlHelper->execute_dml($sql); } //获取信息，并把数据组装好返回给客户端（聊天室） function getMessage($getter,$sender){ $sql="select * from message where getter='$getter' and sender='$sender' and isGet=0"; $sqlHelper=new SqlHelper(); $array=$sqlHelper->execute_dql2($sql); $messageInfo="<meses>"; for($i=0;$i< count($array);$i++){ $row=$array[$i]; $messageInfo.="<mesid>{$row['id']}</mesid><sender>{$row['sender']}</sender><getter>{$row['getter']}</getter><con>{$row['content']}</con><sendTime>{$row['sendTime']}</sendTime>"; } $messageInfo.="</meses>"; file_put_contents("d:/test.txt",$messageInfo."\r\n",FILE_APPEND); $sqlHelper->close_connect(); return $messageInfo; } } <?php//这个控制器专门响应用户取数据的请求 header("conntent-type:text/xml;charset=utf-8"); header("Cache-Control:no-cache"); $getter=$_POST['getter']; $sender=$_POST['sender']; // file_put_contents("d:/test.txt",$sender."-".$getter,FILE_APPEND); require_once 'MessageService.class.php'; $messageService=new MessageService(); $mesList=$messageService->getMessage($getter,$sender);// file_put_contents("d:/test.txt","news--".$mesList."\r\n",FILE_APPEND); echo $mesList;?>为什么在第一段函数getMessage()中
var cons=mesRes.getElementsByTagName("con");
alert时为0.数据库中有添加了记录
我看的是韩顺平的php视频。
求大神搭救
回复讨论(解决方案)
在IE中getElementsByName()是根据ID来取的，但在其他浏览器中，是正常按name属性来取的，因此如果你的代码运行在非IE浏览器上，就会出现取不到值的现象
抱歉，没留意你写的是 getElementsByTagName() 你应该改成 getElementById()
var cons=mesRes.getElementById("con");
var sendTimes=mesRes.getElementById("sendTime");
另外你还有不少低级的错误
$('mycons').value+="对说："+cons[i].childNodes[0].nodeValue+" "+sendTimes[i].childNodes[0].nodeValue;
php代码是不会被客户端浏览器执行的，而且你得到的 cons, sendTimes 都只是一个DOM对象，而不是一个结果集
抱歉，没留意你写的是 getElementsByTagName() 你应该改成 getElementById()
var cons=mesRes.getElementById("con");
var sendTimes=mesRes.getElementById("sendTime");
另外你还有不少低级的错误
$('mycons').value+="
很感谢你的指导。新手呢，我今天知道问题出在哪了
header("conntent-type:text/xml;charset=utf-8"); header("Cache-Control:no-cache");这里是content-type打多了个n
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