AJAX is not a new programming language, but a new way to use
existing standards.
AJAX is use for partial page updating.
Ajax is a catchy name for a type of programming made popular
in 2005 by Google and other big web developers. Ajax loosely stands for
Asynchronous JavaScript and XML, but that just sounds like techno jargon to
many people.
AJAX is the art of exchanging data with a server, and update
parts of a web page - without reloading the whole page.
When JavaScript was released, people loved all the cool
things you could do with the web browser to make a more user-friendly
experience. You could do form validation, quirky popup messages, make cool web
tools and more. However, JavaScript had no way of sending information between
the web browser and the web server.
If you wanted to get any information from a database on the
server, or send user information to a server-side script like PHP, you had to
make an HTML form to GET or POST data to the server. The user would then have
to click "Submit", wait for the server to respond, then a new page
would load with the results. I'm sure we have all gotten slightly annoyed when
having to wait for especially slow websites!
Ajax attempts to remedy this problem by letting your JavaScript
communicate directly with the server, using a special JavaScript object
XMLHttpRequest. With this object, your JavaScript can get information from the
server without having to load a new page!
XMLHttpRequest - The XMLHttpRequest
object is used to exchange data with a server.
XHTML - A rigid subset of html
which is used to mark-up and style the information.
DOM - The Document Object Model
which can be accessed by the client browsers.
XML - The format used to transfer
the data from the server to the client.
GET or POST?
GET is simpler and faster than POST, and can be used in most
cases.
However, always use POST requests when:
A cached file is not an option (update a file or database on
the server).
Sending a large amount of data to the server (POST has no
size limitations).
Sending user input (which can contain unknown characters),
POST is more robust and secure than GET.
$.ajax({
url: '/Controller/GetData/',
success: function(data){
lineitems = data;
}
});
// post data to server
$.ajax({
url: '/Controller/SaveData/',
data: { incoming: lineitems }
});
Thanks,
Anil
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