Validation1 Example Source Code

Validation1 Example

Filename: validation1.htm

<html>

<head>
<title>Validation1 Example</title>
<link rel="stylesheet" type="text/css" href="../styles.css" />
</head>

<body>

<?php
    function validate_name($n)
    {
        if ($n != "")
        {
            return 1;
        }
        else
        {
            return 0;
        }
    }

function validate_gender($g)
    {
        if ($g == "F" || $g == "M")
        {
            return 1;
        }
        else
        {
            return 0;
        }
    }

function validate_age($a)
    {
        if (is_numeric($a) && 0 <= $a && $a <= 120)
        {
            return 1;
        }
        else
        {
            return 0;
        }
    }
?>

<h2>Validation1 Example</h2>

<?php
    if (!isset($_POST['hidden']))
    {
        $name = "";
        $name_error_message = "";
        $gender = "";
        $gender_error_message = "";
        $age = "";
        $age_error_message = "";
    }
    else
    {
        // Validate Name
        $name = $_POST['txtName'];
        if (validate_name($name))
        {
	    $name_error_message = "";
        }
        else
        {
            $name_error_message = "Please enter a name.";
        }

// Validate Gender
        $gender = $_POST['txtGender'];
        if (validate_gender($gender))
        {
	    $gender_error_message = "";
        }
        else
        {
            $gender_error_message = "Please enter F or M.";
        }

// Validate Name
        $age = $_POST['txtAge'];
        if (validate_age($age))
        {
	    $age_error_message = "";
        }
        else
        {
            $age_error_message = "Please enter an age between 0 and 120.";
        }
    }  
?>

<p>Gender: <span style="color:red">
             <?php echo $gender_error_message; ?><br>
         </span>
<input type="text" name="txtGender" 
       value="<?php echo $gender; ?>"
</p>

<p>

<?php
    if (validate_name($name) && validate_gender($gender) && 
                                validate_age($age))
    {
        echo "Validated Name: $name <br />";
        echo "Validated Gender: $gender <br />";
        echo "Validated Age: $age";
    }
?>
</p>

</body>
</html>