阿贾克斯不会得到过去的readyState 1，为什么呢？

问题描述

我试图让此功能工作，这确实对参数的要求网​​址然后发送到的responseText 回调该函数。

它似乎只到达 readyState的1 （感谢Firebug的命令）。

这是：

 功能要求（URL，回调）{
如果（window.XMLHtt prequest）{// Mozilla中，Safari浏览器，...
    HTT prequest =新XMLHtt prequest（）;
}否则，如果（window.ActiveXObject）{// IE
    HTT prequest =新的ActiveXObject（Microsoft.XMLHTTP）;
} 其他{
    返回false;
}
HTT prequest.onreadystatechange =功能（）{
    的console.log（HTT prequest.readyState）;
    如果（HTT prequest.readyState == 4）{
        回调（HTT prequest.responseText）;
    }
};
的console.log（HTT prequest，URL）;
HTT prequest.open（GET，URL，真正的）;
HTT prequest.send（空）;
}
 

解决方案

我workarounded这个问题分配onload事件，而不是onreadystatechange的：

 功能要求（URL，回调）{
如果（window.XMLHtt prequest）{// Mozilla中，Safari浏览器，...
    HTT prequest =新XMLHtt prequest（）;
}否则，如果（window.ActiveXObject）{// IE
    HTT prequest =新的ActiveXObject（Microsoft.XMLHTTP）;
} 其他{
        返回false;
}

VAR readyStateChange =功能（）{
    的console.log（HTT prequest.readyState）;

    如果（HTT prequest.readyState == 4）{
                回调（HTT prequest.responseText）;
    }
};


如果（isFirefox＆安培;＆安培; firefoxVersion→3）{
    HTT prequest.onload = readyStateChange;
} 其他 {
    HTT prequest.onreadystatechange = readyStateChange;
}

的console.log（HTT prequest，URL）;
HTT prequest.open（GET，URL，真正的）;
HTT prequest.send（空）;
}
 

I'm trying to get this function to work, which does a request for parameter url then sends the responseText to callback which is a function.

It seems that it only gets to readyState 1 (thanks to the Firebug commands).

Here it is:

function Request(url, callback){
if (window.XMLHttpRequest) { // Mozilla, Safari, ...
    httpRequest = new XMLHttpRequest();
} else if (window.ActiveXObject) { // IE
    httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
} else{
    return false;
}
httpRequest.onreadystatechange = function(){
    console.log(httpRequest.readyState);
    if (httpRequest.readyState == 4) {
        callback(httpRequest.responseText);
    }
};
console.log(httpRequest, url);
httpRequest.open('GET', url, true);
httpRequest.send(null);
}

解决方案

I workarounded this problem assigning onload event instead of onreadystatechange:

function Request(url, callback){
if (window.XMLHttpRequest) { // Mozilla, Safari, ...
    httpRequest = new XMLHttpRequest();
} else if (window.ActiveXObject) { // IE
    httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
} else{
        return false;
}

var readyStateChange = function(){
    console.log(httpRequest.readyState);

    if (httpRequest.readyState == 4) {
                callback(httpRequest.responseText);
    }
};


if (isFirefox && firefoxVersion > 3) {
    httpRequest.onload = readyStateChange;
} else {
    httpRequest.onreadystatechange = readyStateChange;
}

console.log(httpRequest, url);
httpRequest.open('GET', url, true);
httpRequest.send(null);
}

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