0
我在JavaScript中創建了一個http客戶端，它對單個非異步和異步GET和POST調用很好，但如果我多次調用makeRequest()，每個請求的響應都是相同的，同時發生非異步請求和異步請求。使用JavaScript的異步xmlHttpRequest httpClient
Service.aspx文件只是中繼參數名稱的值，因此應該針對每個請求進行更改。
這裏是JavaScript代碼：
///-- Usage examples ----------------------------------------------
/*
//Full
client = new httpClient();
client.method("get");
client.baseUrl("Service.aspx");
client.requestData({name: "John", age: 56, location: "Kansas City"});
var response = client.makeRequest();
alert(response);
//Multiple requests
client = new httpClient();
client.baseUrl("Service.aspx");
client.requestData("?q=foo");
var data = client.makeRequest();
alert(data);
client.requestData("?q=foobar");
var data = client.makeRequest();
alert(data);
//Minimal
client = new httpClient();
client.baseUrl("Service.aspx?q=test");
client.makeRequest();
//Minimal, with deafult base URL http://localhost/
client = new httpClient();
client.requestData("?q=foobar");
client.makeRequest();
//Full, with response output contained in an object
client = new httpClient();
client.method("get");
client.baseUrl("Service.aspx");
client.requestData("?q=test");
var requestObject = client.makeRequestObject();
alert(requestObject.MimeType);
alert(requestObject.charset);
//Custom callback function to handle asychronous httprequests
myCallback = function (response) {
alert("myCallback: " + response);
}
client = new httpClient();
client.asynchronous(true);
client.method("post");
client.baseUrl("Service.aspx");
client.requestData({ name: "John", age: 56, location: "Kansas City" });
client.callback(myCallback);
client.makeRequest();
*/
function httpClient() {
this.$baseUrl = "http://localhost/";
this.$method = "get";
this.$response = "";
this.$requestData = "";
this.$asynchronous = false;
}
httpClient.prototype.method = function (requestMethod) {
this.$method = requestMethod;
}
httpClient.prototype.baseUrl = function (requestBaseUrl) {
this.$baseUrl = requestBaseUrl;
}
httpClient.prototype.requestResponse = function() {
return this.$response;
}
$_xmlhttpConstruct = function() {
var xmlhttp;
if (window.XMLHttpRequest) {//IE7+, Firefox, Chrome, Opera, Safari
return new XMLHttpRequest();
}
else {//IE6, IE5
try { return new ActiveXObject("Msxml2.XMLHTTP.6.0"); }
catch (e) { }
try { return new ActiveXObject("Msxml2.XMLHTTP.3.0"); }
catch (e) { }
try { return new ActiveXObject("Microsoft.XMLHTTP"); }
catch (e) { }
}
}
httpClient.prototype.setRequestHeader = function (header, value) {
}
$_callbackFunction = null;
httpClient.prototype.callback = function (func) {
$_callbackFunction = func;
}
$_invokeCallback = function (func, response) {
try {
func(response);
}
catch (e) {
}
}
httpClient.prototype.asynchronous = function (boolean) {
this.$asynchronous = boolean;
}
httpClient.prototype.makeRequest = function() {
//Initializing the xmlhttp object
var xmlhttp = $_xmlhttpConstruct();
if (this.$requestData == undefined) {
xmlhttp.open(this.$method, this.$baseUrl, this.$asynchronous);
}
else {
if (this.$method == "post") {
xmlhttp.open(this.$method, this.$baseUrl, this.$asynchronous);
xmlhttp.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xmlhttp.send(this.$requestData);
if (this.$asynchronous) {
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
//Callback
$_invokeCallback($_callbackFunction, xmlhttp.responseText);
}
}
}
else {
return xmlhttp.responseText;
}
//alert("URL: " + this.$baseUrl + "\n" + "Method: " + this.$method + "\n" + "Request data: " + this.$requestData);
}
if (this.$method == "get") {
xmlhttp.open(this.$method, this.$baseUrl + this.$requestData, this.$asynchronous);
xmlhttp.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
xmlhttp.send(null);
if (this.$asynchronous) {
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
//Callback
$_invokeCallback($_callbackFunction, xmlhttp.responseText);
}
}
}
else {
return xmlhttp.responseText;
}
//alert("URL: " + this.$baseUrl + "\n" + "Full request URL: " + this.$baseUrl + this.$requestData + "\n" + "Method: " + this.$method + "\n" + "Request data: " + this.$requestData);
}
}
}
httpClient.prototype.makeRequestObject = function() {
var requestObject = {
method: this.$method,
url: this.$baseUrl,
requestData: this.$requestData,
responseData: "",
MimeType: "",
charset: ""
}
var xmlhttp;
if (window.XMLHttpRequest) {//IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
}
else {//IE6, IE5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
if (this.$requestData == undefined) {
xmlhttp.open(this.$method, this.$baseUrl, false);
}
else {
//alert(this.$baseUrl + this.$requestData);
xmlhttp.open(this.$method, this.$baseUrl + this.$requestData, false);
}
if (this.$method == "post") {
xmlhttp.open(this.$method, this.$baseUrl, false);
xmlhttp.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xmlhttp.send(this.$requestData);
//alert("URL: " + this.$baseUrl + "\n" + "Method: " + this.$method + "\n" + "Request data: " + this.$requestData);
}
if (this.$method == "get") {
xmlhttp.open(this.$method, this.$baseUrl + this.$requestData, false);
xmlhttp.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
xmlhttp.send();
//alert("URL: " + this.$baseUrl + "\n" + "Full request URL: " + this.$baseUrl + this.$requestData + "\n" + "Method: " + this.$method + "\n" + "Request data: " + this.$requestData);
}
var mc = xmlhttp.getResponseHeader("Content-Type");
mc = mc.split(";");
requestObject.MimeType = mc[0];
requestObject.charset = mc[1].substring(9);
requestObject.responseData = xmlhttp.responseText;
return requestObject;
}
httpClient.prototype.requestData = function (data) {
if (typeof (data) == "object") {
var i = 0;
for (key in data) {
if (i == 0) {
if (this.$method == "get") {
this.$requestData += "?" + key + "=" + data[key];
}
if (this.$method == "post") {
this.$requestData += key + "=" + data[key];
}
i++;
}
else {
this.$requestData += "&" + key + "=" + data[key];
}
}
}
else {
this.$requestData = data;
}
}
下面是如何使用客戶端（非異步）：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title></title>
</head>
<body>
<div id="debug"></div>
<script type="text/javascript">
useResponse = function (response) {
document.getElementById("debug").innerHTML += response;
}
client = new httpClient();
client.method("get");
client.baseUrl("Service.aspx");
client.requestData({ name: "Peter", age: 45, location: "Kansas City" });
useResponse(client.makeRequest());
client.requestData({ name: "Paul", age: 76, location: "Kansas City" });
useResponse(client.makeRequest());
client.requestData({ name: "Mary", age: 36, location: "Kansas City" });
useResponse(client.makeRequest());
</script>
</body>
</html>
另一使用示例
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title></title>
</head>
<body>
<div id="debug"></div>
<script type="text/javascript">
myCallback = function (response) {
document.getElementById("debug").innerHTML += response;
}
client = new httpClient();
client.asynchronous(true);
client.method("get");
client.baseUrl("Service.aspx");
client.callback(myCallback);
client.requestData({ name: "Peter", age: 45, location: "Kansas City" });
client.makeRequest();
client.requestData({ name: "Paul", age: 76, location: "Kansas City" });
client.makeRequest();
client.requestData({ name: "Mary", age: 36, location: "Kansas City" });
client.makeRequest();
</script>
</body>
</html>
但內完成所有請求後，div的html是「PeterPeterPeter」。 它應該是「PeterPaulMary」或任何組合，具體取決於先完成哪些請求。
請任何幫助greric appriciated。