8: Working with Forms, Sessions, and Cookies in VS .NET

Generation DataMatrix in VS .NET 8: Working with Forms, Sessions, and Cookies

8: Working with Forms, Sessions, and Cookies
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case 1: > <!-- page 1 --> <form method="post" action="< php echo $_SERVER['PHP_SELF']; >"> Name: <br /> <input type="text" name="name" size="30"> <br /> E-mail address: <br /> <input type="text" name="email"> <br /> Telephone: <br /> <input type="text" name="tel" size="10"> <br /> <input type="hidden" name="pageID" value=< php echo ($pageID+1); >> <input type="submit" name="submit" value="Go to Page 2"> </form> < php break; case 2: // perform validation of page 1 data // if errors, display error list // if no errors, display page 2 > <!-- page 2 --> <form method="post" action="< php echo $_SERVER['PHP_SELF']; >"> Card type: <br /> <select name="cctype"> <option value="V">Visa</option> <option value="M">MasterCard</option> <option value="A">AmEx</option> </select> <br /> Name on credit card: <br /> <input type="ccname" name="ccname" size="30"> <br />
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Credit card expiration date (MM/YYYY): <br /> <input type="text" name="ccexp" size="7"> <br /> Email invoice: <br /> <input type="radio" name="email_invoice" value="Y">Yes <input type="radio" name="email_invoice" value="N">No <br /> <input type="hidden" name="pageID" value=< php echo ($pageID+1); >> < php // remove unnecessary form elements unset($_POST['submit']); unset($_POST['pageID']); // add previous submission to session importPrevPageData(); > <input type="submit" name="submit" value="Place Order"> </form> < php break; case 3: // perform validation of page 2 data // if errors, display error list // if no errors, display page 3 // remove unnecessary form elements unset($_POST['submit']); unset($_POST['pageID']); // add previous submission to session importPrevPageData(); // get all the submitted data from the session $data = $_SESSION['form']; // process the data // for example, save to a database or file print_r($data);
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8: Working with Forms, Sessions, and Cookies
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// print success message echo "Thank you for your order"; break; } > </body> </html>
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Here, the importPrevPageData() function merely iterates through the $_POST array on each invocation, creating a copy of the POST-ed data in the $_SESSION['form'] array On the final page, the $_SESSION['form'] array will contain the data submitted over all the previous form pages This data can then be validated and processed in the usual manner If you don t like the thought of manually managing the task of preserving data across a multipage form, there is a third alternative: use PEAR s HTML_ QuickForm_Controller class, available from http://pearphpnet/package/ HTML_QuickForm_Controller, to handle it for you automatically The HTML_ QuickForm_Controller class is an add-on to the HTML_QuickForm package, designed specifically to deal with multipage forms Here s how you might use it:
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< php // include HTML_QuickForm class include "HTML/QuickFormphp"; // include HTML_Quickform_Controller class include "HTML/QuickForm/Controllerphp"; include "HTML/QuickForm/Actionphp"; // initialize session // form input is stored here // during page transitions session_start(); // custom class for form pages class checkoutPage extends HTML_QuickForm_Page { // override default method function buildForm() { $this->_formBuilt = true; // get page name // build appropriate form elements switch($this->getAttribute("id")) { // first page case 'persInfo':
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//--- form elements here ---// // add header $this->addElement("header", null, "Personal Information"); // add input boxes $this->addElement("text", "name", "Name:", array("size" => 30)); $this->addElement("text", "email", "E-mail address:"); $this->addElement("text", "tel", "Telephone:", array("size" => 10)); // add submit button $this->addElement("submit", null, "Go to Page 2"); //--- form validation rules here ---// // for example $this->applyFilter(array("name", "email", "tel"), "trim"); $this->addRule("name", "Please enter your name", "required"); $this->addRule("email", "Please enter a valid e-mail address", "email"); break; // second page case 'pymtInfo': //--- form elements here ---// // add header $this->addElement("header", null, "Payment Information"); // add card selection list $select = $this->addElement("select", "cctype", "Card type:", array("V" => "Visa", "M" => "MasterCard", "A" => "AmEx")); // add input box for card name $this->addElement("text", "ccname", "Name on credit card:", array("size" => 25));
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8: Working with Forms, Sessions, and Cookies
// add input box for card expiry date $this->addElement("text", "ccexp", "Credit card expiration date (MM/YYYY):", array("size" => 7)); // add radio button group $radio[] =& HTML_QuickForm::createElement("radio", null, null, "Yes", "Y"); $radio[] =& HTML_QuickForm::createElement("radio", null, null, "No", "N"); $this->addGroup($radio, "email_invoice", "Email invoice:"); // add submit button $this->addElement("submit", null, "Place Order"); //--- form validation rules here ---// // for example $this->applyFilter(array("ccname", "ccexp"), "trim"); $this->addRule("ccname", "Please enter the card holder's name", "required"); break; // add cases for additional pages as needed } // once page is validated and submitted // go to next page $this->setDefaultAction("next"); } } // custom class for form action class checkoutAction extends HTML_QuickForm_Action { function perform(&$page, $actionName) { // get all the submitted data as an array $data = $page->controller->exportValues(); // process the data // for example, save to a database or file print_r($data);
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