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Ajax Basics

Using ajax is a very fast method to retrieve data from a database with a php file.

1) create a request object (looks like PHP oop)
var=new XMLHttpRequest();

2) Send a request to the server with open() and send() methods“GET”,”myfile.php?q=”+str,true);

3) response from server Use responseText for string from server or responseXML as xml data
//3A. SET / STORES A FUNCTION (or the name of a function) to be called automatically each time the readyState property changes 
xmlhttp.onreadystatechange=function()  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)