ajax usage
I love async feature of AJAX so much. I won’t use it if JS could only send request synchroly.
Also way to use it rather easy enough:
function getXHR()
{
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
return xmlhttp;
}Function above will get an available XML http request object, which is the key component of async-communication.
function send(data)
{
var xhr = getXHR();
xhr.open("POST", "TaskServlet", true);
//xhr.open("GET", "TaskServlet?name=value", true);
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
var string = "id=" + data.id + "&task=" + data.task + "&owner=" + data.owner;
console.log(string);
xhr.send(string);
//xhr.send(); use this in GET method
}Right? Light weight and easy to handle.
Notice different parameter passing usage should be taken when in disparate request METHOD.