<td>Country</td>
<td>
<select id="country" onChange="getState(this.value)" name="country">
<option value="">All</option>
<option value="1">India</option>
<option value="2">China</option>
</select>
</td>
function getState(str){
if(str=='All'){
document.getElementById("state").innerHTML="";
}else{
document.getElementById("state").innerHTML="<img src='<?php echo $serverimage?>ajax-loader.gif' />";
if(window.XMLHttpRequest){
xmlhttp=new XMLHttpRequest();
}
else
{
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?countryid="+str,true);
xmlhttp.send();
}//ELSE ENDS
}//FUNCTION ENDS
//State.php
<?php
$country=$_GET["country"];
/*
code to fetch all states from database with $country and fetch in variable $states
Fetch records based on value passed in country dropw down. ie id or countryname
*/
echo '<select name="state" id="state">';
foreach($states as $state)
echo '<option value="'.$state.'">'.$state.'</option>';
echo '<option value="Other">Other</option>';
echo '</select>';
exit;
?>
Tento kód jsem netestoval, takže by tam mohly být nějaké hloupé chyby, takže si na to dejte pozor.