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完全了解AJAX (三)
作者:zym007 日期:2006-12-23 16:57:03
对象状态
上文中提到过，我们需要定义一种命令方式，用于回应请求状态改变，这可以通过设置onreadystatechange属性完成，请注意我所说的是“状态改变”，并不是“完成”-因为这两者之间是完全不同的。结合我们刚才所学的知识，最好通过例子来说明。写入如下代码：
<script>
var xmlhttp = false;
try {
xmlhttp = new XMLHttpRequest();
} catch (trymicrosoft) {
try {
xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch (othermicrosoft) {
try {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
} catch (failed) {
xmlhttp = false;
}
}
}
function goAJAX() {
alert("InitialReadyState is:"+xmlhttp.readyState);
xmlhttp.onreadystatechange = myReturnMethod;
xmlhttp.open("GET", "another_file.html", true);
xmlhttp.send(null);
}
function myReturnMethod() {
alert("NewReadyState is:"+xmlhttp.readyState);
}
</script>
<button onclick="javascript:goAJAX()">Let's try it!</button>
在被请求的文件中，我们可以填补任何我们想要的内容，只要可以建立，我们就不打算使用其中的内容。
点提交按钮前，我们还应该注意，对象状态警告出现多次，最终显示的对象状态值是4。不同的浏览器对此的处理方法不同，Safari精确地从0-4计数，对于firefox，1出现两次，0只在运行的第一次出现。值得庆幸的是，我们仅仅对readyState是4的情况感兴趣，但是为了完整性，我们还是看看其他数字所代表的含义。
0：未初始化-打开命令之前，对象不包含数据
1：对象正在加载数据-发送请求命令之前
2：加载完毕-请求已经被发出
3：交互-请求正在被处理，可能会得到一些数据，但不完全，所以不能安全使用
4：完成-请求已完成，最终数据可以安全使用。
这些新信息说明，只有在警告显示请求完成后，才能改变myReturnMethod。
function myReturnMethod() {
if (xmlhttp.readyState==4){
alert("NewReadyState is:"+xmlhttp.readyState);
}
}
上文中提到过，我们需要定义一种命令方式，用于回应请求状态改变，这可以通过设置onreadystatechange属性完成，请注意我所说的是“状态改变”，并不是“完成”-因为这两者之间是完全不同的。结合我们刚才所学的知识，最好通过例子来说明。写入如下代码：
<script>
var xmlhttp = false;
try {
xmlhttp = new XMLHttpRequest();
} catch (trymicrosoft) {
try {
xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch (othermicrosoft) {
try {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
} catch (failed) {
xmlhttp = false;
}
}
}
function goAJAX() {
alert("InitialReadyState is:"+xmlhttp.readyState);
xmlhttp.onreadystatechange = myReturnMethod;
xmlhttp.open("GET", "another_file.html", true);
xmlhttp.send(null);
}
function myReturnMethod() {
alert("NewReadyState is:"+xmlhttp.readyState);
}
</script>
<button onclick="javascript:goAJAX()">Let's try it!</button>
在被请求的文件中，我们可以填补任何我们想要的内容，只要可以建立，我们就不打算使用其中的内容。
点提交按钮前，我们还应该注意，对象状态警告出现多次，最终显示的对象状态值是4。不同的浏览器对此的处理方法不同，Safari精确地从0-4计数，对于firefox，1出现两次，0只在运行的第一次出现。值得庆幸的是，我们仅仅对readyState是4的情况感兴趣，但是为了完整性，我们还是看看其他数字所代表的含义。
0：未初始化-打开命令之前，对象不包含数据
1：对象正在加载数据-发送请求命令之前
2：加载完毕-请求已经被发出
3：交互-请求正在被处理，可能会得到一些数据，但不完全，所以不能安全使用
4：完成-请求已完成，最终数据可以安全使用。
这些新信息说明，只有在警告显示请求完成后，才能改变myReturnMethod。
function myReturnMethod() {
if (xmlhttp.readyState==4){
alert("NewReadyState is:"+xmlhttp.readyState);
}
}
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