Use of XMLHttpRequest object in AJAX
What is the use of XMLHttpRequest object in AJAX?
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XMLHttpRequest object is used by the JavaScript to move XML and another text data between server and client. XMLHttpRequest object permits a client-side script to carry out an HTTP request. The AJAX applications use a XMLHttpRequest object so that browser could communicate to server without a postback of the whole page. In previous versions of the Internet Explorer, MSXML ActiveX component is apt to provide this functionality; but, Internet Explorer 7 and another browser, like Mozilla Firefox, XMLHttpRequest is not apt to.
Cascading if-else statement: A form of if-else statement in which all else-part (apart from the last) comprises of a further nested if-else statement. Employed to overcome the trouble of textual drift frequently related with nested if statements.
Client: It is a user of a service. The Web client requests resources from Web server, for example: Whenever the client is an object then this is the sender of messages to its object servers.
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