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| About site: Programming/Languages/JavaScript/AJAX - Guide to Using XMLHttpRequest (with Baby Steps) from WebPasties |
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| About site: http://www.webpasties.com/xmlHttpRequest/ |
Title: Programming/Languages/JavaScript/AJAX - Guide to Using XMLHttpRequest (with Baby Steps) from WebPasties Detailed tutorial that explains how to creating an AJAX ZIP code database including a PHP/MySQL backend.
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Guide to Using AJAX and XMLHttpRequest from WebPasties
function getHTTPObject() {
var xmlhttp;
/*@cc_on
@if (@_jscript_version >= 5)
try {
xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
} catch (E) {
xmlhttp = false;
}
}
@else
xmlhttp = false;
@end @*/
if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
try {
xmlhttp = new XMLHttpRequest();
} catch (e) {
xmlhttp = false;
}
}
return xmlhttp;
}
var url = "getCityState.php?param=";
var isWorking = false;
var http = getHTTPObject();
function handleHttpResponse() {
if (http.readyState == 4) {
isWorking = false;
if (http.responseText.indexOf('invalid') == -1) {
var xmlDocument = http.responseXML;
var city = xmlDocument.getElementsByTagName('city').item(0).firstChild.data;
var state = xmlDocument.getElementsByTagName('state').item(0).firstChild.data;
document.getElementById('city').value = city;
document.getElementById('state').value = state;
isWorking = false;
}
}
}
function updateCityState() {
if (!isWorking) {
var zipValue = document.getElementById("zip").value;
http.open("GET", url + escape(zipValue), true);
isWorking = true;
http.onreadystatechange = handleHttpResponse;
http.send(null);
}
}
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Guide to Using AJAX and XMLHttpRequest from WebPasties
Back to WebPasties
by Bill BercikCopyright 2005 ©
 The XMLHttpRequest object is a handy dandy JavaScript object that offers a
convenient way for webpages to get information from servers without refreshing themselves. The benefit to end users is
that they don't have to type as much and they don't have to wait as long. For example, having the user's city and state
show up in a webpage automatically after the ZIP code has been typed in is a big time saver.
Although the XMLHttpRequest object might sound complex and different from any other JavaScript object you have ever used, it really
isn't.
A good way to think of the XMLHttpRequest object is as you would think of the JavaScript Image object.
As we know, with the Image object you can dynamically specify a new URL for the image source without reloading the page.
Similarly with the XMLHttpRequest object, you can dynamically specify a URL to get some server data without reloading the page.
The purpose of this article is to demonstrate through a series of baby steps just how easy it is to use the XMLHttpRequest object.
In order to complete this tutorial you should have some basic PHP, MySQL and JavaScript experience. That said, the PHP programming in these examples is so basic that if you do not have PHP experience, it may still be possible for you to look at the PHP code and apply the functionality to your weapon of choice, be it PERL, ASP, or JSP.
Below is a the ZIP code example mentioned earlier which takes advantage of the XMLHttpRequest object.
Notice how after you type in a ZIP code and then change the caret's focus to the next form field, the city and state will be magically filled in for you.
This tutorial will lead you through steps you can use to add this functionality to your site
ZIP code:
City:
State:
To Step #1 - Creating the Form
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Detailed | tutorial | that | explains | how | to | creating | an | AJAX | ZIP | code | database | including | a | PHP/MySQL | backend. |
|
http://www.webpasties.com/xmlHttpRequest/
Guide to Using XMLHttpRequest (with Baby Steps) from WebPasties 2008 August
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dvd
Detailed tutorial that explains how to creating an AJAX ZIP code database including a PHP/MySQL backend.
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