php - How to store checkboxes states in session?

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php - How to store checkboxes states in session?

asked Jan 31, 2022 in Technique[技术] by 深蓝 (71.8m points)

Here is my code

<table class='block'>
  <tr>
    <td>
      <input class='c1' type='checkbox' lid='checkbox1'>
        <label>checkbox1</label>
      </td>
    <td>
      <input class='c2' type='checkbox' lid='checkbox2'>
        <label>checkbox2</label>
      </td>
    <td>
      <input class='c2' type='checkbox' lid='checkbox3'>
        <label>checkbox3</label>
      </td>
    <td>
      <input class='c2' type='checkbox' lid='checkbox4'>
        <label>checkbox4</label>
      </td>
    <td>
      <input class='c3' type='checkbox' lid='checkbox5'>
        <label>checkbox5</label>
      </td>
    <td>
      <input class='c3' type='checkbox' lid='checkbox6'>
        <label>checkbox6</label>
      </td>
  </tr>
</table>
<script type='text/javascript'>
  $('input[type=checkbox]').each(function (){
  if (this.checked) {
  var x = $(this).attr('lid');
  }
  });
</script>
<?php
    if(!isset($_SESSION))
        {
            session_start();
        }
    if(!isset($_GET['x'])) $_GET['x'] = '';
    $_SESSION['x'] = $_GET['x'];
 ?>

I want to save selected checkboxes in a session. So that, when I come back to the page, the same checkboxes should remain selected.

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1 Answer

深蓝 · Answer 1 · 2022-01-31T07:13:41+0000

Okay, Here is a working example of what your trying to accomplish using a session.

<?php 
session_start();
if(isset($_GET['checkbox']))
{
    $_SESSION[$_GET['checkbox'][0]] = isset($_SESSION[$_GET['checkbox'][0]]) ? +!($_SESSION[$_GET['checkbox'][0]]) : TRUE;
    print_r($_SESSION[$_GET['checkbox'][0]]);
    die;
}
?>
<html>
    <head>
        <script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
    </head>
    <body>
        <table class='block'>
             <tr>
                 <td>
                     <input class='c1' type='checkbox' lid='checkbox1' <?php echo (isset($_SESSION['checkbox1'])) ? 'CHECKED="CHECKED"' : ''; ?>><label>checkbox1</label>
                 </td>
                 <td>
                     <input class='c2' type='checkbox' lid='checkbox2' <?php echo (isset($_SESSION['checkbox2'])) ? 'CHECKED="CHECKED"' : ''; ?>><label>checkbox2</label>
                 </td>
                 <td>
                     <input class='c2' type='checkbox' lid='checkbox3' <?php echo (isset($_SESSION['checkbox3'])) ? 'CHECKED="CHECKED"' : ''; ?>><label>checkbox3</label>
                 </td>
                 <td>
                     <input class='c2' type='checkbox' lid='checkbox4' <?php echo (isset($_SESSION['checkbox4'])) ? 'CHECKED="CHECKED"' : ''; ?>><label>checkbox4</label>
                 </td>
                 <td>
                     <input class='c3' type='checkbox' lid='checkbox5' <?php echo (isset($_SESSION['checkbox5'])) ? 'CHECKED="CHECKED"' : ''; ?>><label>checkbox5</label>
                 </td>
                 <td>
                     <input class='c3' type='checkbox' lid='checkbox6' <?php echo (isset($_SESSION['checkbox6'])) ? 'CHECKED="CHECKED"' : ''; ?>><label>checkbox6</label>
                 </td>
             </tr>
         </table> 
    </body>
</html>

<script>
    $(document).ready(function() {
       $('input[type=checkbox]').on('change', function() {
           $.get("sefesf.php", { 'checkbox[]':$(this).attr('lid') });
       }) 
    });
</script>

The Skinny

Basically, each time you check a box a GET request is made to itself and does +! on the session. Which means the opposite of. So it will automatically check and uncheck the session variable. The request is done asyncronously with AJAX and stores the data. The CHECK feature is done server side with PHP on page load with a simple ternary operator in the DOM.

To Do

Make sure you add some validation on the _GET, you dont want to be storing erraneous data.

Also, this is a pretty dirty way to do this type of thing, but a way none-the-less.

Good luck, let me know if you have questions!

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