values of drop down menu

@Y_LessMay 25.2009 — #Only HTML state is stored in most browsers for 'back', JavaScript state isn't. However how are you setting the new values? In my tests writing the HTML for the options direct seems to work fine when you click back:

document.getElementById('select_id').innerHTML = '&lt;option&gt;1&lt;/option&gt;&lt;option&gt;2&lt;/option&gt;&lt;option&gt;3&lt;/option&gt;';

@themoonauthorMay 26.2009 — #Hi Y_Less

Thanks for your reply, i am pasting some of my codes below:

This is part of my js file.

[code=html]function ListCities(region_id) { 
 
   var strURL="findTheCity.php?i_region_id="+region_id;
   var req = getXMLHTTP();
 
   if (req) {
 
   req.onreadystatechange = function() {
   if (req.readyState == 4) {
   if (req.status == 200) { 
   document.getElementById('theCitydiv').innerHTML=req.responseText; 
   } else {
   alert("There was a problem while using XMLHTTP:n" + req.statusText);
   }
   } 
   } 
   req.open("GET", strURL, true);
   req.send(null);
   } 
  }
 [/code]

in my php file (findTheCity.php), i have this:

[code=php]ob_start();
 session_start();
 header('Content-Type: text/html; charset=windows-1256'); 
 include("../admin/db.php");
 
 if (isset($_GET['i_region_id'])) {
 $region_id=intval($_GET['i_region_id']);
 } else {
 $region_id=intval($_SESSION['region_id']);
 }
 
 if (isset($_GET['city'])) {
 $cityId=intval($_GET['city']); 
 } else {
 $cityId=intval($_SESSION['city_id']); 
 }
 
 $query="SELECT * 
 FROM city 
 WHERE cty_region_id='$region_id'
 ";
 $result=mssql_query($query);
 ?>
 <select name="city_id" onchange="getCenter(<?=$cityId?>,this.value)">
 <option>Choose City</option>
 <?php 
 while($row=mssql_fetch_array($result)) { ?>
 <option value="<?=$row['cty_id']?>"><?=$row['cty_name']?></option>
 <? } ?>
 </select>[/code]

and in my html form, i have this:

[code=php]<tr class='trAlternate'>
 <td valign='top'><br/><font color='red'>*</font>Region<br/>
 ";?><select name='region_id' onChange="ListCities(this.value)">
 
   <?php 
   list_regions();
   echo " 
   </select>
   </td>
   <td valign='top'><br/>
   <font color='red'>*</font>City<br/>
   <div id='theCitydiv'>
   <select name='city_id'>";
   echo "<option>Choose Region First</option>
   </select>
   </div>
   </td>
   <td><br/>
   <font color='red'>*</font>Center<br/>
   <div id='Centerdiv'>
   <select name='work_in_center'>";
   echo "<option>Choose City First</option>
   </select>
   </div>
   </td>
   </tr>[/code]

so, i am working with "Region->Cities->Centers" instead of "Country -> City - >District"

i am not sure where to put "innerHtml" in my code as you mentioned.

Thanks

M

values of drop down menu

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