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  1. 1. Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring Partner Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd
  2. 2. Jobs Applied # 1 2 3 Company Designation Applied Date Current Status
  3. 3. Typing Speed Week Target Achieved 1 40 2 3 27wpm
  4. 4. AJAX Anjali G Geetha Geetha G 9497879952
  5. 5. AJAX • Asynchronous Javascript and XML. • Not a stand-alone language or technology. • It is a technique that combines a set of known technologies in order to create faster and more user friendly web pages. • It is a client side technology.
  6. 6. AJAX • Prevents unnecessary reloading of a page. • When we submit a form, whole page is reloaded from the server. • This causes very long waiting times. • AJAX aims at loading only the necessary information, and making only the necessary changes on the current page without reloading the whole page.
  7. 7. AJAX • AJAX is based on Javascript, and the main functionality is to access the web server inside the Javascript code. • We access to the server using special objects; • When user initiates an event, a javascript function is called which access server using the objects. • The received information is shown to the user by means of the Javascript’s functions.
  8. 8. XMLHTTP Object • The object that is used to connect to the remote server is called XMLHTTP. • It resembles the Java’s URL object that is used to access a specific URL and get the contents.
  9. 9. Sending information • After creating the object, we can send information to the web server and get the answer using this object’s functions: • GET METHOD: • POST METHOD:“GET”, url, true) xmlhttp.send()"POST", url, true) xmlhttp.send(“date=11-11-2006&name=Ali") • Third argument tells that data will be processes asynchronously. When server responds, the “OnReadyStateChange” event handler will be called.
  10. 10. The onreadystatechange Event Property Description onreadystate Stores a function (or the name of a function) to be change called automatically each time the readyState property changes readyState Holds the status of the XMLHttpRequest. Changes from 0 to 4: 0: request not initialized 1: server connection established 2: request received 3: processing request 4: request finished and response is ready status 200: "OK" 404: Page not found
  11. 11. function loadXMLDoc() { var xmlhttp; if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { document.getElementById("myDiv").innerHTML=xmlhttp.responseText; } }"GET","ajax_info.txt",true); xmlhttp.send(); }
  12. 12. </script> </head> <body> <div id="myDiv"><h2>Let AJAX change this text</h2></div> <button type="button" onclick="loadXMLDoc()">Change Content</button> </body> </html>
  13. 13. THANKYOU
  14. 14. If this presentation helped you, please visit our page and like it. Thanks in advance. | |
  15. 15. Contact Us Emarald Mall (Big Bazar Building) Mavoor Road, Kozhikode, Kerala, India. Ph: + 91 – 495 40 25 550 Start up Village Eranakulam, Kerala, India. Email: NC Complex, Near Bus Stand Mukkam, Kozhikode, Kerala, India. Ph: + 91 – 495 40 25 550