Question

Possible Duplicate:
jquery/ajax load new content when available

i have a table named news with 3 fields i.e (id, news, time) and i have a setInterval after every 3mints to fetch news from google or any news site ….

now i want to fetch only new rows inserted after every 5 minutes…with jquery $.ajax()…how can i do that…

do i reload the whole table or there is a way to fetch only the new ones…

Answer 1

Have a variable which stores the latest ID number for a returned row, and then include that in the AJAX call (having the PHP server-side script only return rows with an ID greater than it).

In the Calling Page

var latestID = 0;
...
/* Within the Variables Section for the AJAX Call */
  laterThan : latestID
...
/* Within the Success AJAX Function */
  latestID = data.highestID; /* Where "data.highestID" is the highest ID returned */

In the Server-Side Script being called via AJAX

<?php
...
/* Within the SQL Query creating the returned rows */
'WHERE
  ...
  AND `id` > '.( isset( $_GET['latestID'] ) ? (int) $_GET['latestID'] : 0 )