xDaevax/Form.php

## Form.php
<?php
class FormProcessor {

	private $_pagePosted; // Boolean: stores a value that indicates whether or not the user submitted the form.
	private $_hasError; // Boolean: If the page has been posted back, whether or not the form contained errors.
	private $_messages; // Strings: Contains validation error messages (if any)
	private $_debug; // Boolean: controls debug output to aid in development.

	function __construct() { // Constructor that is called when: "$x = new FormProcessor" is called.
		$this->_debug = true; // set this to false to get rid of unwanted output
		$this->_pagePosted = isset($_POST["submit"]);
		$this->_hasError = false;
		$this->_messages = "";
		if($this->_pagePosted) { // If this is the form being posted, perform the necessary actions
			$this->ProcessData();
		}
	}

	// This controls whether or not the validation messages are shown.
	public function ShowMessages() { // returns a css- class name for which class to put on the output messages.
		if($this->_hasError) {
			return "messages";
		} else {
			return "no-messages";
		}
	}

	private function ProcessData() { // Performs business logic and saves the data
		if($this->IsValidForm()) {
			// Only save the data if the form is valid
			// TODO: Load the values from the form using the GetPostValue method, then write them to a database of some kind.
			$proNumber = $this->GetPostValue("ProNumber");
			if($this->_debug) {
				echo "Pro Number Received: " . $proNumber . "<br />";
			}
		} else {
			$this->_hasError = true;
		}
	}

	private function IsValidForm() { // Validates the form and adds validation error messages.
		$returnValue = true;
		// TODO: Add any form field validation here
		// Example to require the Pro Number field.
		if($this->GetPostValue("ProNumber") == "") {
			$this->_messages .= "Pro Number Required.<br />";
			$returnValue = false;
		}

		return $returnValue;
	}

	// Convenience method to check the posted values in the form.
	public function GetPostValue($key) {
		if($this->_pagePosted) {
			return $_POST[$key]; // return the posted value (if found).
		} else {
			return ""; // don't bother checking the POST since it hasn't happened yet.
		}
	}

	// Returns the validation messages (if any)
	public function GetMessages() {
		return $this->_messages;
	}

	// Public function for exposing the value that indicates whether or not the form has been submitted
	public function IsPostBack() {
		return $this->_pagePosted;
	}
}

$processor = new FormProcessor; // Instantiate the FormProcessor class so we can use it.

?>
<html>
	<head>
		<title>Sample Form</title>
		<style type="text/css">
			body {
				font-size: small;
				font-family: Arial, Verdana, Sans-Serif;
				color: #000000;
				margin: 0px;
				padding: 0px;
			}

			.body-liner {
				margin: 0px auto;
				width: 90%;
				text-align: center;
				padding: 2px;
			}

			H1 {
				display: block;
			}

			.form-wrapper {
				margin: 4px auto;
				display: block;
				width: 300px;
				clear: right;
				height: 22px;
			}

			.no-messages {
				display: none;
			}

			.form-wrapper LABEL {
				float: left;
				height: 20px;
				display: block;
				width: 130px;
				margin-right: 20px;
				text-align: right;
			}
			.form-wrapper INPUT[type='text'] {
				float: left;
				height: 20px;
				display: block;
				width: 150px;
				text-align: left;
			}

			.messages {
				display: block;
				background-color: yellow;
				color: #880000;
				font-weight: bold;
			}
		</style>
	</head>
	<body>
		<div class="body-liner">
			<h1 class="page-header">
				Load Form
			</h1>
			<div class="<?php echo $processor->ShowMessages()?>">
				<?php
					echo $processor->GetMessages();
				?>
			</div>
			<div class="form-wrapper">
				<form action="" method="post" name="load-form">
					<span class="form-wrapper">
						<label for="ProNumber">Pro #</label>
						<input type="text" name="ProNumber" id="ProNumber" value="<?php echo $processor->GetPostValue("ProNumber")?>" />					</span>
				    <span class="form-wrapper">
						<label for="OriginLocation">Origin City &amp; ZipCode</label>
						<input type="text" name="OriginLocation" id="OriginLocation" vlaue="<?php echo $processor->GetPostValue("OriginLocation");?>" />
					</span>
					<input type="submit" name="submit" id="submit" />
				</form>
			</div>
		</div>
	</body>
</html>
	<?php
	class FormProcessor {

	private $_pagePosted; // Boolean: stores a value that indicates whether or not the user submitted the form.
	private $_hasError; // Boolean: If the page has been posted back, whether or not the form contained errors.
	private $_messages; // Strings: Contains validation error messages (if any)
	private $_debug; // Boolean: controls debug output to aid in development.

	function __construct() { // Constructor that is called when: "$x = new FormProcessor" is called.
	$this->_debug = true; // set this to false to get rid of unwanted output
	$this->_pagePosted = isset($_POST["submit"]);
	$this->_hasError = false;
	$this->_messages = "";
	if($this->_pagePosted) { // If this is the form being posted, perform the necessary actions
	$this->ProcessData();
	}
	}

	// This controls whether or not the validation messages are shown.
	public function ShowMessages() { // returns a css- class name for which class to put on the output messages.
	if($this->_hasError) {
	return "messages";
	} else {
	return "no-messages";
	}
	}

	private function ProcessData() { // Performs business logic and saves the data
	if($this->IsValidForm()) {
	// Only save the data if the form is valid
	// TODO: Load the values from the form using the GetPostValue method, then write them to a database of some kind.
	$proNumber = $this->GetPostValue("ProNumber");
	if($this->_debug) {
	echo "Pro Number Received: " . $proNumber . "<br />";
	}
	} else {
	$this->_hasError = true;
	}
	}

	private function IsValidForm() { // Validates the form and adds validation error messages.
	$returnValue = true;
	// TODO: Add any form field validation here
	// Example to require the Pro Number field.
	if($this->GetPostValue("ProNumber") == "") {
	$this->_messages .= "Pro Number Required.<br />";
	$returnValue = false;
	}

	return $returnValue;
	}

	// Convenience method to check the posted values in the form.
	public function GetPostValue($key) {
	if($this->_pagePosted) {
	return $_POST[$key]; // return the posted value (if found).
	} else {
	return ""; // don't bother checking the POST since it hasn't happened yet.
	}
	}

	// Returns the validation messages (if any)
	public function GetMessages() {
	return $this->_messages;
	}

	// Public function for exposing the value that indicates whether or not the form has been submitted
	public function IsPostBack() {
	return $this->_pagePosted;
	}
	}

	$processor = new FormProcessor; // Instantiate the FormProcessor class so we can use it.

	?>
	<html>
	<head>
	<title>Sample Form</title>
	<style type="text/css">
	body {
	font-size: small;
	font-family: Arial, Verdana, Sans-Serif;
	color: #000000;
	margin: 0px;
	padding: 0px;
	}

	.body-liner {
	margin: 0px auto;
	width: 90%;
	text-align: center;
	padding: 2px;
	}

	H1 {
	display: block;
	}

	.form-wrapper {
	margin: 4px auto;
	display: block;
	width: 300px;
	clear: right;
	height: 22px;
	}

	.no-messages {
	display: none;
	}

	.form-wrapper LABEL {
	float: left;
	height: 20px;
	display: block;
	width: 130px;
	margin-right: 20px;
	text-align: right;
	}
	.form-wrapper INPUT[type='text'] {
	float: left;
	height: 20px;
	display: block;
	width: 150px;
	text-align: left;
	}

	.messages {
	display: block;
	background-color: yellow;
	color: #880000;
	font-weight: bold;
	}
	</style>
	</head>
	<body>
	<div class="body-liner">
	<h1 class="page-header">
	Load Form
	</h1>
	<div class="<?php echo $processor->ShowMessages()?>">
	<?php
	echo $processor->GetMessages();
	?>
	</div>
	<div class="form-wrapper">
	<form action="" method="post" name="load-form">
	<span class="form-wrapper">
	<label for="ProNumber">Pro #</label>
	<input type="text" name="ProNumber" id="ProNumber" value="<?php echo $processor->GetPostValue("ProNumber")?>" /> </span>
	<span class="form-wrapper">
	<label for="OriginLocation">Origin City & ZipCode</label>
	<input type="text" name="OriginLocation" id="OriginLocation" vlaue="<?php echo $processor->GetPostValue("OriginLocation");?>" />
	</span>
	<input type="submit" name="submit" id="submit" />
	</form>
	</div>
	</div>
	</body>
	</html>