tag:blogger.com,1999:blog-67311625200441776672011-04-21T16:14:29.468-07:00shyamalahttp://www.blogger.com/profile/13157897414791546437noreply@blogger.comBlogger11100tag:blogger.com,1999:blog-6731162520044177667.post-60010753751397583602009-05-14T06:27:00.001-07:002009-05-14T08:10:30.843-07:00<span style="font-weight: bold;font-size:85%;" >Ajax Interview questions</span><span style="font-size:85%;"><br /></span><ul><li><span style="font-size:85%;">What is Ajax?</span></li></ul><div style="text-align: justify;"> <span style="font-size:85%;"> AJAX is not a new programming language, but a new technique for creating better, faster,and more interactive web applications.<br /><br />Ajax stands for 'Asynchronous JavaScript and XML'<br /><br />With AJAX, a JavaScript can communicate directly with the server, with the <b>XMLHttpRequest</b> object. With this object, a JavaScript can trade data with a web server, without reloading the page.</span></div><ul><li><span style="font-size:85%;">Ajax is based on which web standards?</span></li></ul><span style="font-size:85%;">- JavaScript<br />- XML<br />- HTML<br />- CSS</span><ul><li><span style="font-size:85%;">What is Asynchronous?</span></li></ul><span style="font-size:85%;">The term <i>asynchronous</i> is usually used to describe communications in which data can be transmitted intermittently rather than in a steady stream. </span><ul><li><span style="font-size:85%;">How does Ajax works?</span></li></ul><span style="font-size:85%;">With AJAX, JavaScript communicates directly with the server, through the JavaScript <b>XMLHttpRequest</b> object.<br /><br />With the XMLHttpRequest object, a web page can make a request to, and get a response from a web server - without reloading the page. The user will stay on the same page, and he or she will not notice that scripts request pages, or send data to a server in the background.<br /><br />The XMLHttpRequest object is supported in all major browsers (Internet Explorer, Firefox, Chrome, Opera, and Safari).</span> <span style="font-size:85%;">All new browsers use the built-in JavaScript <b>XMLHttpRequest </b>object to create an XMLHttpRequest object (IE5 and IE6 uses an ActiveXObject).</span><ul><li><span style="font-size:85%;">What are the important properties of </span><span style="font-size:85%;">XMLHttpRequest object</span></li></ul><span style="font-size:85%;">- onreadystatechange property</span><br /><p><span style="font-size:85%;">After a request to a server, we need a function to receive the data returned from the server.The onreadystatechange property stores the function that will process the response from a server. The function is stored in the property to be called automatically.</span><br /></p><span style="font-size:85%;">- readyState property<br /><br />The readyState property holds the status of the server's response. Each time the readyState property changes, the onreadystatechange function will be executed.</span><br /><br /><span style="font-size:85%;">- responseText property<br /><br />The data sent back from a server can be retrieved with the responseText property.</span><br /><ul><li><span style="font-size:85%;">How do we send response to the server?</span></li></ul><span style="font-size:85%;">To send a request to the server, we use the open() and send() methods.<br /><br />The open() method takes three arguments. The first argument defines which method to use when sending the request (GET or POST). The second argument specifies the URL of the server-side script. The third argument specifies that the request should be handled asynchronously.<br /><br />The send() method sends the request off to the server. </span><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/6731162520044177667-6001075375139758360?l=sprayagaa.blogspot.com' alt='' /></div>shyamalahttp://www.blogger.com/profile/13157897414791546437noreply@blogger.com1