There is 3 dropdown for country, state and district. I was doing when i select a country from country dropdown then state dropdown shows only adjacent to the country and when i select state then district dropdown shows only adjacent district to the state drop down.
My home.php code is
<?php
include "config.php";
?>
<html>
<head>
<script type="text/javascript">
function showstate(str){
if (str == "") {
document.getElementById("state").innerHTML = "";
return;
}
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
}
else {// code for IE6, IE5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function(){
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
document.getElementById("state").innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open("GET", "state.php?country=" + str, true);
xmlhttp.send();
}
function showcity(str2){
if (str2 == "") {
document.getElementById("city").innerHTML = "";
return;
}
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
}
else {// code for IE6, IE5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function(){
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
document.getElementById("city").innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open("GET", "district.php?state=" + str2, true);
xmlhttp.send();
}
</script>
</head>
<body>
<form >
Choose your country : <select name="country" onchange="showstate(this.value)"> <option>Select country </option>
<?php
$query = "SELECT DISTINCT country FROM area";
$result = mysql_query($query);
while($row = mysql_fetch_array($result)){
echo"<option value =".$row[0]."> ".$row[0]."</option>";
}
?>
</select>
State : <select id="state" name="state" onChange="showcity(this.value)"> <option>Select state</option> </select>
District : <select id="city" name="city"> <option>Select district </option> </select>
</form>
</body>
</html>
and state.php is
<?php
include "config.php";
echo " <option>Select state </option> " ;
if(isset( $_GET['country']) )
{
$country = $_GET['country'];
}
$query = "SELECT DISTINCT state FROM area WHERE country = '".$country."' ";
$result = mysql_query($query);
while ($row = mysql_fetch_assoc($result))
{
echo"<option value =".$row['state']."> ".$row['state']."</option>";
}
?>
And district.php is
<?php
include "config.php";
echo " <option>Select district </option> " ;
if(isset( $_GET['state']) )
{
$state = $_GET['state'];
}
$query = "SELECT DISTINCT district FROM area WHERE state = '".$state."' ";
$result = mysql_query($query);
while ($row = mysql_fetch_assoc($result))
{
echo"<option value =".$row['district']."> ".$row['district']."</option>";
}
?>
Everything is ok. But the problem is that using all three dropdown when i select any district, if again in the same page i m going to reselect country from the country dropdown then district does not remains changed.
