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Mettre à jour le formulaire en utilisant Ajax, PHP, MYSQL

J'ai fini par comprendre. Merci pour l'aide de tous.

<p id="alert"></p>    
<form id="form" method="post" action="/ajax/update_company_info.php">

    <!-- start id-form -->
    <table border="0" cellpadding="0" cellspacing="0"  id="id-form">
    <tr>
        <th valign="top">Business Name:</th>
        <td><input type="text" name="company_name" class="inp-form" /></td>
        <td></td>
    </tr>
    <tr>
        <th valign="top">Address 1:</th>
        <td><input type="text" name="address_1" class="inp-form" /></td>
        <td></td>
    </tr>
    <tr>
        <th valign="top">Address 2:</th>
        <td><input type="text" name="address_2" class="inp-form" /></td>
        <td></td>
    </tr>



<tr>
    <th>&nbsp;</th>
    <td valign="top">
            <input id="where" type="hidden" name="customer_id" value="1" />
            <input type="submit" value="Save" id="submit">

    </td>
    <td></td>
</tr>
</table>
<!-- end id-form  -->
</form>

mise à jour.js

$(document).ready(function() {

$('form').submit(function(evt) {
  evt.preventDefault();

   $.each(this, function() {
            // VARIABLES: Input-specific
            var input = $(this);
            var value = input.val();
            var column = input.attr('name');

            // VARIABLES: Form-specific
            var form = input.parents('form');
            //var method = form.attr('method');
            //var action = form.attr('action');

            // VARIABLES: Where to update in database
            var where_val = form.find('#where').val();
            var where_col = form.find('#where').attr('name');

  $.ajax({
      url: "/ajax/update_company_info.php",
      data: {
                        val: value,
                        col: column,
                        w_col: where_col,
                        w_val: where_val
      },
      type: "POST",
      success: function(data) {         

      $('#alert').html("<p>Sent Successfully!</p>");

                        }

  }); // end post
  });// end each input value
}); // end submit
}); // end ready

update_customer_info.php

    <?php

include($_SERVER['DOCUMENT_ROOT'] . '/load.php');

function clean($value)
{
    return mysql_real_escape_string($value);
}
// FORM: Variables were posted
if (count($_POST))
{

    // Prepare form variables for database
    foreach($_POST as $column => $value)
        ${$column} = clean($value);

    // Perform MySQL UPDATE
    $result = mysql_query("UPDATE customers SET ".$col."='".$val."'
        WHERE ".$w_col."='".$w_val."'")
        or die ('Error: Unable to update.');
}
?>