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What Is AJAX?

•Asynchronous JavaScript and XML

•NOT a programming language but a way to use existing standards

•Made popular in 2005 (Google Suggest)

•Can interact with servers and files without needing to refresh the browser

•Works well with XML and JSON

How AJAX Works

AJAX Internet Standards

AJAX is based on current internet standards. It uses a combination of the following technologies…

XML Http Request object –

Lets us interact with server data asynchronously(without page refresh)

Java Script / DOM –

Lets us interact with the information

CSS –

Lets us to style the returned data

XML / JSON -

Often used as the format for transferring data

XML Http Request Object

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The XMLHttpRequest JavaScript object is used to send and receive info to and from the browser asynchronously.

Object is instantiated differently in older versions of IE.

<!Doctype html><html> <head>  <title>PHP Conditionals</title> </head> <body>  </body></html>  <?php  $x = 5;  if($x > 2){   echo 'it is greater';  } ?>  <?php  $x = 1;  if($x > 2){   echo 'it is greater';  } else {   echo 'it is less';  } ?>   <?php  $x = 1;  if($x > 2 && $x < 10){   echo 'True';  } else {   echo 'False';  } ?>  <?php  $x = 20;  if($x < 10 || $x == 20){   echo 'True';  } else {   echo 'False';  } ?>  <?php  $x = 5;  if($x == 2){   echo $x.' is 2';  } else if($x == 5) {   echo $x.' is 5';  } else {   echo $x.' is not 2 or 5';  } ?>  <?php  $x = 4;  switch($x){   case 2:    echo $x.' is 2');    break;   case 5:    echo $x.' is 5');    break;   default:    echo $x.' is not 2 or 5');    break;  } ?>  <?php  $favoritemovie = "";  switch ($favoritemovie){   case "Titanic":     echo "Not a bad choice!";    break;   case "Water World":     echo "No comment";    break;   case "Scream 2":     echo "It has its moments";    break;   default : echo "I am sure it was great";  } ?>

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what is AJAX?

SURAJ KUMAR

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