PHP and MySQL Web Development 4th Ed-tqw-_darksiderg

Adding Ajax Elements to Earlier Projects
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Although you may or may not need all the items in these files in the Ajax-enabled version
of the bookmark addition sequence, the comment at the beginning says it all—
every file will contain all our functions and exceptions. In this situation, as
you are moving from a series of dynamic pages to all-in-one Ajax-enabled functionality,
it is better to have a few extra elements than to remove core functionality before you are
sure you don’t need it. Keep the first line of add_bms.php as is.
The second line, which begins or continues a user session, should also remain as is;
even in the Ajax-enabled version of this action you will want some sense of security
intact. Similarly, the third line can remain as well.This line gives the shortname
$new_url to the POST value sent through the request:
$new_url = $_POST['new_url'];
Finally, you are at the point in which you can remove something, namely this line:
do_html_header('Adding bookmarks');
Because you are already on a page (add_bm_form.php) that contains HTML header
information, there is no need to repeat it again—you’re not moving to a different page.
This repetition produces the two sets of header graphics and titles that you see in Figure
34.4. For similar reasons, you can eliminate two lines at the end of add_bms.php as well:
display_user_menu();
do_html_footer();
If you remove these elements, upload the file to the server, and attempt to add another
bookmark, the results will be closer to what you expect, although there are still some
changes to be made. Figure 34.5 shows the application display with changes made in
the code to this point.
We still have a duplicate message regarding the status of the user as “logged in,” but
the issues are not nearly as unappealing as before.The next step is to remove the duplicate
messages and to change some of the other exceptions-related functionality so that it
makes sense in an Ajax-environment.