xmlhttp.responseText不显示文本 [英] xmlhttp.responseText not display text

问题描述

我遇到了ajax responseText的情况.来自url的响应文本功能良好.但是，ajax代码内部出现错误.它无法识别响应文本，并且将类添加到目标ID.这是代码:

I'm having a situation with ajax responseText. The response text from url is well function. But something inside the ajax code goes wrong. It doesn't recognize the response text and add class to the targeted id. Here's the code :

<script type="text/javascript">
function updateField(nameValue){
    var xmlHttp=null;
    try{
        xmlHttp=new XMLHttpRequest();
        }
catch (e){
    try{
        xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
        }
catch (e){
    alert("No AJAX!");
    return false;
    }
}
xmlHttp.onreadystatechange=function(){
    if(xmlHttp.readyState==4){
        if (xmlHttp.status==200){
            //this will be called after update
                var responseText = xmlHttp.responseText;        
            }
        }
    }
    //this will send the data to server to be updated
    xmlHttp.open("GET", 'inc/room_rate_updatez.php?'+ nameValue, true);
    xmlHttp.send(null);
}

function doSomethingAfterUpdate(retValFromPHP){
//retValFromPHP can be any thing you want!

    if (reponseText == "Failed"){
       document.getElementById("result").innerHTML=xmlhttp.responseText.className = "error";
    }else{
       document.getElementById("result").innerHTML=xmlhttp.responseText.className = "success";
    }
}

</script>

<div id="result"></div><input type="text" name="rate|498|6500-5200-4600-5600-4100|0" id="498" value="6500" size="10" onchange="updateField(this.name + '=' + this.value);"/>

room_rate_updatez.php的响应为成功"和失败". 我已经尝试过很多次了，但是没有运气.请提出建议.

The response from room_rate_updatez.php are "Succeed" and "Failed". I've tried many times to make it work but no luck. Please suggest.

推荐答案

尝试一下:

function updateField(nameValue){
   var xmlHttp=null;
   ....
   xmlHttp.onreadystatechange=function(){
    if(xmlHttp.readyState==4){
        if (xmlHttp.status==200){
            //this will be called after update
                var responseText = xmlHttp.responseText;        
                doSomethingAfterUpdate(responseText);
            }
        }
    }
    //this will send the data to server to be updated
    xmlHttp.open("GET", 'inc/room_rate_updatez.php?'+ nameValue, true);
    xmlHttp.send(null);
}



function doSomethingAfterUpdate(retValFromPHP){
//retValFromPHP can be any thing you want!

    if (retValFromPHP == "Failed"){
       document.getElementById("result").innerHTML = "error";
       document.getElementById("result").className = "error" 
    }else{
       document.getElementById("result").innerHTML = "success";
       document.getElementById("result").className = "success" 
    }
}

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