i have two text box. a add button and a table. after each time a user enter a product id and quantity to the textbox, and then clicked the add button, the entered data and the previously entered data will be displayed on the table.
My question is : is it possible to displayed all the entered data each time after the button is clicked?

Yes, it's very easy. If you're storing all the user input in a database, just select all the input that the user submitted from the database and generate your HTML table from that.

In pseudo-php:

<?php

db_connect(...);


// Insert any new rows into the database.
if (isset($_POST['new_entry']))
{
    db_query("insert new entry into database");
}


// Get all the rows from the database and output them in a table.
$result = db_query("select all rows from database");

echo "<table>\n";

// each database row is output in its own table row.
while ($row = db_fetch_array($result))
{
   echo " <tr>\n";
   echo " <td>{$row['col1']}</td>\n";
   echo " <td>{$row['col2']}</td>\n";
   echo " ...\n";
   echo " </tr>\n";
}
echo "</table>\n";


// output the form to create a new row.
echo "<form method=\"post\" action=\"{$_SERVER['PHP_SELF']}\">\n";
echo " <input ... />\n";
echo "</form>

?>


Take care,

Nik
http://www.bigaction.org/