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Web site designers - Chapter 17 . Building Forms from Queries 325

humphreyblogart — Fri, 28 Mar 2008 11:19:21 +0000

Chapter 17 . Building Forms from Queries 325 Figure 17-4: A prepopulated check box Listing 17-6: Checkbox displaying boolean data from database (optout.php) In case you need affordable webhost to host your website, our recommendation is ecommerce web host services.

324 Part II . PHP and MySQL Listing (Web design rates)

humphreyblogart — Fri, 28 Mar 2008 00:26:29 +0000

324 Part II . PHP and MySQL Listing 17-5 (continued) –>

Comment edit

$success_msg

EOFORMPAGE; echo $form_page; ?> Remember that in an HTML form integers and doubles must use the TEXT or TEXTAREA type, as there is no specifically numeric HTML form field type. CHECKBOX The CHECKBOX type has only one possible value per input: off (unchecked) or on (checked). The database field which records this information is almost always going to be a small integer or bit type with values 0 and 1 corresponding to unchecked or checked check boxes. Figure 17-4 shows a common type of check box being edited. Listing 17-6 demonstrates how to use a check box to display and change a Boolean value. Tip
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Chapter 17 . Building (Tomcat web server) Forms from Queries 323

humphreyblogart — Thu, 27 Mar 2008 10:06:01 +0000

Chapter 17 . Building Forms from Queries 323 Listing 17-5: Editing data from database (comment_edit.php) Your comment has been updated.

; } else { error_log(mysql_error()); $success_msg =

Something went wrong.

; } } else { // Get the comment header and comment $comment_id = $_GET[ comment_id ]; $query = SELECT comment_header, comment FROM comments WHERE ID = $comment_id ; $result = mysql_query($query); $comment_arr = mysql_fetch_array($result); $comment_header = stripslashes($comment_arr[0]); $comment = stripslashes($comment_arr[1]); } $thispage = $_SERVER[ PHP_SELF ]; //Have to do this for heredoc $form_page = <<< EOFORMPAGE

Rate your boss anonymously

Figure 17-2 shows the rating form after an error has occurred. Some of you might be thinking, Hey, wait! You said logic always comes before display but then you started this script with a bunch of HTML. Very perspicacious but not quite right. Look closely and you will realize that we are merely setting a bunch of text to a couple of variable strings ($reg_form and $rate_form). In the entire PHP section, we actually don t display anything. We merely construct a string, $message, which will be plugged in to the HTML at the bottom. If we took away the HTML, you would see a blank page in the browser. So it s OK to assemble the text you re going to want to display in the logic part; just don t echo it out to the browser until the end.
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Yahoo web hosting - Chapter 17 . Building Forms from Queries 319

humphreyblogart — Tue, 25 Mar 2008 15:23:29 +0000

Chapter 17 . Building Forms from Queries 319 mysql_select_db( test ); // Check to see this name and email have not appeared before $as_name = addslashes($_POST[ name ]); $tr_name = trim($as_name); $as_email = addslashes($_POST[ email ]); $tr_email = trim($as_email); $query = SELECT sub_id FROM raters WHERE Name = $tr_name AND Email = $tr_email ; $result = mysql_query($query); if (mysql_num_rows($result) > 0) { error_log(mysql_error()); $message = Someone with this name and password has already rated . If you think a mistake was made, please email help@example.com. ; } else { // Insert name and email address $query = INSERT INTO raters (ID, Name, Email) VALUES(NULL, $tr_name , $tr_email ) ; $result = mysql_query($query); if (mysql_affected_rows() == 1) { $message = $rate_form; } else { error_log(mysql_error()); $message =

Something went wrong with your signup attempt.

; $message .= $reg_form; } } } } elseif ($_POST[ submit ] == Submit && $_POST[ stage ] == rate ) { // Third time, store the rating and boss s name // Open connection to the database mysql_connect( localhost , phpuser , sesame ) or die( Failure to communicate with database ); mysql_select_db( test ); // Insert rating and boss s name $as_boss = addslashes($_POST[ boss ]); $tr_boss = trim($as_boss); $rating = $_POST[ rating ]; $query = INSERT INTO ratings (ID, Rating, Boss) VALUES(NULL, $rating , $tr_boss ) ; $result = mysql_query($query); Continued
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318 Part II . PHP and MySQL Listing (Free web hosting with ftp)

humphreyblogart — Tue, 25 Mar 2008 03:29:32 +0000

318 Part II . PHP and MySQL Listing 17-4 (continued) information with your rating.

EOREGFORM; $rate_form = <<< EORATEFORM

My boss is:

EORATEFORM; if (!$_POST[ submit ]) { // First time, just show the registration form $message = $reg_form; } elseif ($_POST[ submit ] == Submit && $_POST[ stage ] == register ) { // Second time, show the registration form again on error, // rating form on successful INSERT if (!$_POST[ name ] || $_POST[ name ] == || strlen($_POST[ name ] > 30) || !$_POST[ email ] || $_POST[ email ] == || strlen($_POST[ email ] > 30)) { $message =

There is a problem. Did you enter a name and email address?

; $message .= $reg_form; } else { // Open connection to the database mysql_connect( localhost , phpuser , sesame ) or die( Failure to communicate with database );
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Chapter 17 (Sex offenders web site) . Building Forms from Queries 317

humphreyblogart — Mon, 24 Mar 2008 17:07:22 +0000

Chapter 17 . Building Forms from Queries 317

Newsletter sign-up form

The first time you load up this page, you should see a normal HTML form exactly like the one in Figure 17-1. If you submit it without any data or with a string that s too long (often a sign of a cracking attempt), you ll see an error message and the form again. If something goes wrong with the database INSERT, you ll see an error message and the form again. Only if the INSERT completes successfully will you not see the form again which is the navigation we want because we don t want people to sign up for the newsletter more than once. In the preceding example, we need to check only for two states of the form (unsubmitted or submitted) so we can use the Submit button as our stage variable. But what if you want to check for more than one state? You need a variable that is capable of taking more than one value. You could either give your Submit button different values, which would show up as different labels in the button itself, or you could set a hidden variable that is capable of taking more than one value depending on the state. We demonstrate the technique in Listing 17-4, which collects some information and then allows you to rate your boss anonymously. Listing 17-4: A three-part form (rate_boss.php) We must ask for your name and email address to ensure that no one votes more than once, but we do not associate your personal Continued
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Web design programs - 316 Part II . PHP and MySQL Listing

humphreyblogart — Mon, 24 Mar 2008 06:16:40 +0000

316 Part II . PHP and MySQL Listing 17-3: Unified form and form-handler (newsletter_signup.php) 30)) { $message =

There is a problem. Did you enter an email address?

; } else { // Open connection to the database mysql_connect( localhost , phpuser , sesame ) or die( Failure to communicate with database ); mysql_select_db( test ); // Insert email address $as_email = addslashes($_POST[ email ]); $tr_email = trim($as_email); $query = INSERT INTO mailinglist (ID, Email, Source) VALUES(NULL, $tr_email , www.example.com/newsletter_signup.html ) ; $result = mysql_query($query); if (mysql_affected_rows() == 1) { $message =

Your information has been recorded.

; $noform_var = 1; } else { error_log(mysql_error()); $message =

Something went wrong with your signup attempt.

; } } // Show the form in every case except successful submission if (!$noform_var) { $thisfile = $_SERVER[ PHP_SELF ]; $message .= <<< EOMSG

Enter your email address and we will send you our weekly newsletter.

EOMSG; } } ?>
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