Ajax powered web page retrieves the web page from the server which is new or changed unlike other web-page where you have to refresh the page to get the latest information.

Rails triggers an Ajax Operation in following ways

☛ Some trigger fires: The trigger could be a user clicking on a link or button, the users inducing changes to the data in the field or on a form

☛ Web client calls the server: A Java-script method, XMLHttpRequest, sends data linked with the trigger to an action handler on the server. The data might be the ID of a checkbox, the whole form or the text in the entry field

☛ Server does process: The server side action handler does something with the data and retrieves an HTML fragment to the web client

☛ Client receives the response: The client side JavaScript, which Rails generates automatically, receives the HTML fragment and uses it to update a particular part of the current