Handling Nested Forms in HTML/php - php

Question

I try to figure out how to handle two nested forms. The first one sends data from select-option dropdown to another_file.php. The nested one should send data from check boxes to current file and should be handled by isset($_POST['...']). Here is my simplified code:
if (isset($_POST['a']))
{
// do something
}
if (isset($_POST['b']))
{
// do something else
}
echo "<form action='another_file.php' method='post'>"; // begin of first form
echo "<table class ='table table-hover table-condensed table-striped table-bordered'>";
echo "<thead>";
echo "<th>ID</th><th>Jídlo</th><th>Množství</th><th>por_cislo</th><th>Odebrat</th>";
echo "</thead>";
while($rows = $stmt->fetch()){
echo "<tr><td>" . $rows['id'] . "</td><td>".$rows['jidlo'];
echo "<select name =".$rows['id']."_".$rows['por_cislo']."> ";
$stmt2 = $db->query($q2);
echo "<option value ='nic'> (vyberte potravinu) </option>";
$max_por_cislo = $rows['por_cislo'];
while($rows2 = $stmt2->fetch())
{
echo '<option value="'.$rows2['id'].'">'.$rows2['jidlo'].'</option>';
};
echo "</select>";
echo "</td> <td>" . $rows['mnozstvi'] . "g <input name = '".$rows['por_cislo']."' type='text' value = '-'></td><td>".$rows['por_cislo']."</td>";
echo "<td><form action ='this_file.php' method = 'post'>"; // begin of nested form
echo "<input type='checkbox' id='atur_peg' name='idecko[]' value=".$rows['id']."*".$rows['por_cislo']." /></td></tr> ";
};
echo "<input type='hidden' name='pc' value=".$plan_cislo.">";
echo "<tr><td colspan='2'><input name = 'go' type='submit' value='OK'/></td><td colspan='2'><input type = 'submit' name ='a' value='ADD'/></td>";
echo "<td><input type = 'submit' name ='b' value='DELETE checked'/></form></td></tr>"; // end of nested form
echo "</table>";
echo "</form>"; // end of first form
Is
there any way to do this correctly?

Answer 1

Instead of nested forms, use jquery to detect checkbox being checked and then change the form action url. Something on this line.. You will have to modify the same to suit your needs.
$(document).ready(function(){
$("#formname").on("change", "input:checkbox", function(){
if( $(this).is(":checked") ) {
$('#formName').attr('action', 'this_file.php');
$("#formname").submit();
}
});
});