php ajax examples and ajax tutorial_PHP tutorial

php ajax examples and ajax tutorials 1. Create a JavaScript program for XMLHttpRequest objects. 2 A JavaScript program that makes asynchronous requests. 3. JavaScript program that handles server response.

php tutorial ajax examples and ajax tutorial
1. Create a web page special effects program for the xmlhttprequest object.
2 A javascript program that makes asynchronous requests.
3 javascript program that handles server response.

*/

//1Javascript program that creates xmlhttprequest object.

function getxmlhttprequest()
{
var xmlhttp=null;
Try
{
                                                                  }
​​catch(e)
{
         try
           {
               xmlhttp = new activexobject("msxml2.xmlhttp"); //For IE browser
}
        catch (e)
           {
             try
                {
                    xmlhttp = new activexobject("microsoft.xmlhttp");
            }
              catch(e)
                {
                   xmlhttp = false;
                                                                                              }
}

return xmlhttp;

}

//2 A javascript program that issues asynchronous requests.

function sendrequest()

{

//Get the value of the text box name of the page form
var user_name = document.getelementbyid("name").value;

if((user_name == null) || (user_name == ""))

         return;

 
xmlhttp = getxmlhttprequest();
If(xmlhttp == null)
{
alert("The browser does not support xmlhttprequest!");
         return;
}

var url = "getusername.php"; //Build the requested url address

url = url + "?name=" + user_name;

 
xmlhttp.open("get", url, true); //Use the get method to open a connection to the url to prepare for making a request
 
//Set a function to be called after the server has processed the request. The function is called updatepage
xmlhttp.onreadystatechange = updatepage;
xmlhttp.send(null); //Send request
}

// 3 A javascript program that handles server responses.

function updatepage()

{

If(xmlhttp.readystate == 4)
{
      var response = xmlhttp.responsetext;
           document.getelementbyid("userinfo").value = response;
}
}

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