Question

I have two forms in the page one is filter, second is the item list, when I apply the filter to item list form, selected values reset to default. For filter I can save selected values, because I submit this form via POST method, but other remains not submited is possible to save selected that form values after page refresh? Here is some code of second form:

<form name="forma" method="post" onMouseOver="kaina();" onSubmit="return tikrinimas()" action="pagrindinis.php?page=generuoti.php">
  <table width="540" border="1" align="center">
  <tr>
    <td>Client:</td>
    <td>MB:</td>
    <td>Price:</td>
  </tr>
  <tr>
    <td>
    <?php
        $query="SELECT name,surname,pers_code FROM Clients";
        mysql_query("SET NAMES 'UTF8'");
        $result = mysql_query ($query);
        echo "<select name=Clients id='clients'>";
        echo "<OPTION value=''>- Choose -</OPTION>\n";
        while($nt=mysql_fetch_array($result)){
            echo "<option value=$nt[pers_code]>$nt[name] $nt[surname]</option>";
        }
        echo "</select>"; 
    ?></td>
  </tr>
</form>

Answer 1

You need to set the selected attribute of your select element based on what is in $_POST. Something like:

$selected = $_POST['Client'];
while($nt=mysql_fetch_array($result)){
  if ($selected == $nt[pers_code]) {
    echo "<option value=$nt[pers_code] selected="selected">$nt[name] $nt[surname]</option>";
  }
  else {
    echo "<option value=$nt[pers_code]>$nt[name] $nt[surname]</option>";
  }
}

Also note that you should probably sanitize any values you get from $_POST.