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AJAX 11


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Hidden frame technique
Technique to facilitate client–server communications. \nSet up a frameset where one frame is set to a width or height of 0 pixels and it's purpose is to initiate communication with the server.\nThe hidden frame w…
Ajax browser support
<html> <body>\n<script language="javascript" type="…
XMLHttpRequest Object (XHR)
an API available to web browser scripting languages such as JavaScript. It is used to send HTTP or HTTPS requests to a web server and load the server response data back into the script
... var ajaxRequest; ... ajaxRequest = new XMLHttpRequest(); ...
Create Ajax object for Opera, Firefox, Safari syntax
Create Ajax object for IE5/6
... var ajaxRequest;\n...\najaxRequest = new ActoveXObject("Microsoft.XMLHTTP");\n...
Create Ajax object for IE7+
... var ajaxRequest;\n...\najaxRequest = new ActoveXObject("Msxml2.XMLHTTP");\n...
AJAX is a technique
AJAX allows web pages to be updated asynchronously by exchanging small amounts of data with the server behind the scenes. This means that it is possible to update parts of a web page, without reloa…
AJAX is Based on Internet Standards which are they?
AJAX is based on internet standards, and uses a combination of:\n\nXMLHttpRequest object (to exchange data asynchronously with a server)\nJavaScript/DOM (to display/interact with the information)\nCSS (to style the data)\nXML (often used as the format for transferring data)
Send a Request To a Server
To send a request to a server, we use the open() and send() methods of the XMLHttpRequest object:\n\nxmlhttp.open("GET","ajax_info.txt",true);\nxmlhttp.send();
GET or POST?
GET is simpler and faster than POST, and can be used in most cases.\n\nHowever, always use POST requests when:\n\nA cached file is not an option (update a file or database on the server)\nSending a l…