Hi to all,
The Following code has been saved as getCities.php
<html>
<head>
<style type="text/css">
body{
background-repeat:no-repeat;
font-family: Trebuchet MS, Lucida Sans Unicode, Arial, sans-serif;
height:100%;
background-color: #FFF;
margin:0px;
padding:0px;
}
select{
width:150px;
}
</style>
<script type="text/javascript" src="ajax.js"></script>
<script type="text/javascript">
var ajax = new Array();
function getCityList(sel)
{
var countryCode = sel.options[sel.selectedIndex].value;
document.getElementById('dhtmlgoodies_city').options.length = 0; //
Empty city select box
if(countryCode.length>0){
var index = ajax.length;
ajax[index] = new sack();
ajax[index].requestFile =
'getCities.php?countryCode='+countryCode; // Specifying which file to get
ajax[index].onCompletion = function(){ createCities(index) }; //
Specify function that will be executed after file has been found
ajax[index].runAJAX(); // Execute AJAX function
}
}
function createCities(index)
{
var obj = document.getElementById('dhtmlgoodies_city');
eval(ajax[index].response); // Executing the response from Ajax as
Javascript code
}
function getSubCategoryList(sel)
{
var category = sel.options[sel.selectedIndex].value;
document.getElementById('dhtmlgoodies_subcategory').options.length =
0; // Empty city select box
if(category.length>0){
var index = ajax.length;
ajax[index] = new sack();
ajax[index].requestFile =
'getSubCategories.php?category='+category; // Specifying which file to
get
ajax[index].onCompletion = function(){ createSubCategories(index)
}; // Specify function that will be executed after file has been found
ajax[index].runAJAX(); // Execute AJAX function
}
}
function createSubCategories(index)
{
var obj = document.getElementById('dhtmlgoodies_subcategory');
eval(ajax[index].response); // Executing the response from Ajax as
Javascript code
}
</script>
</head>
<title>Dynamic Combo</title>
<body>
<form action="" method="post">
<table>
<tr>
<td>Country: </td>
<td><select id="dhtmlgoodies_country" name="dhtmlgoodies_country"
onchange="getCityList(this)">
<option value="">Select a country</option>
<option value="dk">Denmark</option>
<option value="no">Norway</option>
<option value="us">US</option>
</select>
</td>
</tr>
<tr>
<td>City: </td>
<td><select id="dhtmlgoodies_city" name="dhtmlgoodies_city">
</select>
</td>
</tr>
<tr>
<td colspan="2"><b>Second example</b></td>
</tr>
<tr>
<td>Category: </td>
<td><select id="dhtmlgoodies_category" name="dhtmlgoodies_category"
onchange="getSubCategoryList(this)">
<option value="">Select a category</option>
<option value="1">Cars</option>
<option value="2">Boats</option>
<option value="3">Airplanes</option>
</select>
</td>
</tr>
<tr>
<td>Sub category: </td>
<td><select id="dhtmlgoodies_subcategory"
name="dhtmlgoodies_subcategory">
</select>
</td>
</tr>
</table>
</form>
</body>
</html>
<?php
if(isset($_GET['countryCode'])){
switch($_GET['countryCode']){
case "no":
echo "obj.options[obj.options.length] = new Option('Bergen','1');\n";
echo "obj.options[obj.options.length] = new
Option('Haugesund','2');\n";
echo "obj.options[obj.options.length] = new Option('Oslo','3');\n";
echo "obj.options[obj.options.length] = new
Option('Stavanger','4');\n";
break;
case "dk":
echo "obj.options[obj.options.length] = new
Option('Aalborg','11');\n";
echo "obj.options[obj.options.length] = new
Option('Copenhagen','12');\n";
echo "obj.options[obj.options.length] = new Option('Odense','13');\n";
break;
case "us":
echo "obj.options[obj.options.length] = new
Option('Atlanta','21');\n";
echo "obj.options[obj.options.length] = new
Option('Chicago','22');\n";
echo "obj.options[obj.options.length] = new Option('Denver','23');\n";
echo "obj.options[obj.options.length] = new Option('Los
Angeles','24');\n";
echo "obj.options[obj.options.length] = new Option('New
York','25');\n";
echo "obj.options[obj.options.length] = new Option('San
Fransisco','26');\n";
echo "obj.options[obj.options.length] = new
Option('Seattle','27');\n";
break;
}
}
?>
and ajax.js code is as follows:
/* Simple AJAX Code-Kit (SACK) v1.6.1 */
/* (c)2005 Gregory Wild-Smith */
/* www.twilightuniverse.com */
/* Software licenced under a modified X11 licence,
see documentation or authors website for more details */
function sack(file) {
this.xmlhttp = null;
this.resetData = function() {
this.method = "POST";
this.queryStringSeparator = "?";
this.argumentSeparator = "&";
this.URLString = "";
this.encodeURIString = true;
this.execute = false;
this.element = null;
this.elementObj = null;
this.requestFile = file;
this.vars = new Object();
this.responseStatus = new Array(2);
};
this.resetFunctions = function() {
this.onLoading = function() { };
this.onLoaded = function() { };
this.onInteractive = function() { };
this.onCompletion = function() { };
this.onError = function() { };
this.onFail = function() { };
};
this.reset = function() {
this.resetFunctions();
this.resetData();
};
this.createAJAX = function() {
try {
this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e1) {
try {
this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e2) {
this.xmlhttp = null;
}
}
if (! this.xmlhttp) {
if (typeof XMLHttpRequest != "undefined") {
this.xmlhttp = new XMLHttpRequest();
} else {
this.failed = true;
}
}
};
this.setVar = function(name, value){
this.vars[name] = Array(value, false);
};
this.encVar = function(name, value, returnvars) {
if (true == returnvars) {
return Array(encodeURIComponent(name),
encodeURIComponent(value));
} else {
this.vars[encodeURIComponent(name)] =
Array(encodeURIComponent(value), true);
}
}
this.processURLString = function(string, encode) {
encoded = encodeURIComponent(this.argumentSeparator);
regexp = new RegExp(this.argumentSeparator + "|" + encoded);
varArray = string.split(regexp);
for (i = 0; i < varArray.length; i++){
urlVars = varArray[i].split("=");
if (true == encode){
this.encVar(urlVars[0], urlVars[1]);
} else {
this.setVar(urlVars[0], urlVars[1]);
}
}
}
this.createURLString = function(urlstring) {
if (this.encodeURIString && this.URLString.length) {
this.processURLString(this.URLString, true);
}
if (urlstring) {
if (this.URLString.length) {
this.URLString += this.argumentSeparator + urlstring;
} else {
this.URLString = urlstring;
}
}
// prevents caching of URLString
this.setVar("rndval", new Date().getTime());
urlstringtemp = new Array();
for (key in this.vars) {
if (false == this.vars[key][1] && true == this.encodeURIString)
{
encoded = this.encVar(key, this.vars[key][0], true);
delete this.vars[key];
this.vars[encoded[0]] = Array(encoded[1], true);
key = encoded[0];
}
urlstringtemp[urlstringtemp.length] = key + "=" +
this.vars[key][0];
}
if (urlstring){
this.URLString += this.argumentSeparator +
urlstringtemp.join(this.argumentSeparator);
} else {
this.URLString += urlstringtemp.join(this.argumentSeparator);
}
}
this.runResponse = function() {
eval(this.response);
}
this.runAJAX = function(urlstring) {
if (this.failed) {
this.onFail();
} else {
this.createURLString(urlstring);
if (this.element) {
this.elementObj = document.getElementById(this.element);
}
if (this.xmlhttp) {
var self = this;
if (this.method == "GET") {
totalurlstring = this.requestFile +
this.queryStringSeparator + this.URLString;
this.xmlhttp.open(this.method, totalurlstring, true);
} else {
this.xmlhttp.open(this.method, this.requestFile, true);
try {
this.xmlhttp.setRequestHeader("Content-Type",
"application/x-www-form-urlencoded")
} catch (e) { }
}
this.xmlhttp.onreadystatechange = function() {
switch (self.xmlhttp.readyState) {
case 1:
self.onLoading();
break;
case 2:
self.onLoaded();
break;
case 3:
self.onInteractive();
break;
case 4:
self.response = self.xmlhttp.responseText;
self.responseXML = self.xmlhttp.responseXML;
self.responseStatus[0] = self.xmlhttp.status;
self.responseStatus[1] =
self.xmlhttp.statusText;
if (self.execute) {
self.runResponse();
}
if (self.elementObj) {
elemNodeName = self.elementObj.nodeName;
elemNodeName.toLowerCase();
if (elemNodeName == "input"
|| elemNodeName == "select"
|| elemNodeName == "option"
|| elemNodeName == "textarea") {
self.elementObj.value = self.response;
} else {
self.elementObj.innerHTML =
self.response;
}
}
if (self.responseStatus[0] == "200") {
self.onCompletion();
} else {
self.onError();
}
self.URLString = "";
break;
}
};
this.xmlhttp.send(this.URLString);
}
}
};
this.reset();
this.createAJAX();
}
This file has been saved inside the same directory where getCities.php is
placed so no need of js/ajax.js i think...