PHP：如何找到复选框被选中的顺序？

Question

I have a PHP code like the one below to see which all players were selected, using a checkbox and a table:

<?php
  $players = $crud->readPlayers();
  if (mysql_num_rows($players) > 0) 
   {
    while ($row = mysql_fetch_array($players))
     {
      ?>
      <tr>
      <td><input type="checkbox" name="player[]" value="<?php echo $row['player_code'] ?>"></td><td> <?php echo $row['player_name'] ?></td> 
      </tr>
     <?php
    }
   }
   else{
    ?><tr><td colspan="2"><center>No to select. Please add before creating a team!</center></td></tr>
  <?php
  } 
?>

This form is handled by another page as:

if(isset($_POST['player'])){
            $i=1;
            foreach($_POST['player'] as $player_code){

              $crud->addTeam($team_id, $player_code,$i++);    
    }

where the third parameter passed to addTeam() is supposed to be the order of players, or the number assigned to the player. Although I get all selected players in the team, I can view the team and players from terminal, I am unable to number them correctly as the order of selection of check boxes, ie, if checkbox with player name 'a' printed next to it is selected after the one with name 'b', it should get a number 2, and not 1. Then, I have to list the whole team in increasing order of player number. player_code is used to store player details in another table, and can vary accordingly, ie, player named 'a' need not have player_code set as 1.

How to I get the order of selection of these check boxes and assign number to players accordingly, without using anything except HTML and PHP ?

Answer 1

I would suggest adding JavaScript to the checkboxes checked/click event. So everytime users click one chk, you could store the player name in another field (maybe hidden?). In that way you will be generating a list of player names in the exact order they were clicked, in that hidden field.

Answer 2

Browsers will also submit form data in the order in which it appears in the form . There is no information about what order controls were selected in.

The Grid

A plain HTML approach would be to have a grid of radio buttons. eg each row represents a player and each column a position.

You would need to write PHP that would validate the submitted data to make sure that any given player wasn't selected multiple times.

Multiple pages

Alternatively, you could require that one player be selected (and submitted to the server) at a time.

Each time the form is submitted, you return a new form with the selected players listed in hidden inputs and omitted from the choices given to the user.

This could be rather slow though.

JavaScript

Violating your HTML+PHP only constraint, you could use JavaScript.

Listen for click events on the checkboxes and store the values in a hidden input (eg as a comma separated list).