Ajax Triple Dropdown With Country - Region - Cities?

Mar 17, 2010

Ajax triple drop-down with country-region-cities, all of the 3 drop down menu will got their value form 3 different tables on one db,vthe third drop down is based on the second selection,and also the second one is base on the first one and the problem with the code i have is: there is $val which will keep what is selected,unfortunately $val will just keep the selection of the first drop down,i mean country is the first one so if the choice is usa the $val will be usa,but i want to have each drop down menu selection in separate variable,

i attached the code
Attached File(s)
a.php (1.24K)
Number of downloads: 186
b.php (1.54K)
Number of downloads: 171

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Dropdown With Ajax / Get List Of Cities Populated From The Database But Getting A Blank Dropdown?

For some time i am battling to solve this problem but iam not coming to any conclusion so thought to seek some help here. The problem is that i am getting a blank dropdown instead i should get list of cities populated from the database. Database connection is fine but iam not getting anything in my dropdown.

This is what iam doing:


require 'includes/connect.php'; - database connection
$country=$_REQUEST['country']; - get from form (index.php)
$q = "SELECT city FROM city where countryid=".$country;
$result = $mysqli->query($q) or die(mysqli_error($mysqli));
if ($result) {
<select name="city">
<option>Select City</option>
$id = 0;
<?php while ($row = $result->fetch_object()) {
$src = $row->city;
$id = $id + 1;
<option value= <?php $id ?> > <?php $src ?></option>
<?php } ?>
<?php } ?>

ajax script is this:

function getXMLHTTP() { //fuction to return the xml http object
var xmlhttp=false;
try{mlhttp=new XMLHttpRequest();}
try{ xmlhttp= new ActiveXObject("Microsoft.XMLHTTP"); }
catch(e){ try{
xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
return xmlhttp;
function getCity(strURL) {
var req = getXMLHTTP();
if (req) {
req.onreadystatechange = function() {
if (req.readyState == 4) {
if (req.status == 200) {
} else {
alert("There was a problem while using XMLHTTP:
" + req.statusText);
req.open("GET", strURL, true);

This is my form code:

<form method="post" action="" name="form1">
<table width="60%" border="0" cellspacing="0" cellpadding="0">
<td width="150">Country</td>
<td width="150"><select name="country" onChange="getCity('findcity.php?country='+this.value)">
<option value="">Select Country</option>
<option value="1">New Zealand</option>
<option value="2">Canada</option>
<tr style="">
<td ><div id="citydiv"><select name="city">
<option>Select City</option>

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can provide some reference / examples for the same? I don't know, how to make Ajax calls and render my views with this !

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Here is what I have...

$query = mysql_query("SELECT city FROM users");
echo "City <select name='city'>";
while ($row=mysql_fetch_array($query))
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HTML Code:
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// JavaScript Document
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function loadcity(state_search)
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HTML4Strict Code:

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