1.XMLHttpRequest:
GET:var client = new XMLHttpRequest();
client.onreadystatechange = handler;
client.open("GET", "unicorn.xml");
client.send();
function handler() {
if(this.readyState == this.DONE) {
if(this.status == 200 &&
this.responseXML != null && this.responseXML.getElementById('test').textContent) {
// success!
processData(this.responseXML.getElementById('test').textContent);
return;
}
// something went wrong
processData(null);
}
}If you just want to log a message to the server:function log(message) {
var client = new XMLHttpRequest();
client.open("POST", "/log");
client.setRequestHeader("Content-Type", "text/plain;charset=UTF-8");
client.send(message);
}Or if you want to check the status of a document on the server:
function fetchStatus(address) {
var client = new XMLHttpRequest();
client.onreadystatechange = function() {
// in case of network errors this might not give reliable results
if(this.readyState == this.DONE)
returnStatus(this.status);
}
client.open("HEAD", address);
client.send();
}