This chapter shows how to keep the values in the input fields when the user clicks the “Submit” button.
PHP: Keep the Form’s Values
We put a small PHP script inside the value attribute of the name, email, and website input fields so that when the user clicks the submit button, the values in those fields will be shown. We put the script between the textarea> and /textarea> tags in the comment textarea field. The value of the $name, $email, $website, and $comment variables are shown by the small script.
Then, we need to show which radio button was chosen. For this, we need to change the checked attribute (not the value attribute for radio buttons):
PHP Form Example
<html>
<head>
<style>
.error {color: #FF0000;}
</style>
</head><body>
<?php
// define variables and set to empty values
$name_error = $emailErr = $genderErr = $websiteErr = “”;
$name = $email = $gender = $class = $course = $subject = “”;if ($_SERVER[“REQUEST_METHOD”] == “POST”) {
if (empty($_POST[“name”])) {
$name_error = “Name is required”;
}else {
$name = validateform($_POST[“name”]);
}if (empty($_POST[“email”])) {
$emailErr = “Email is required”;
}else {
$email = validateform($_POST[“email”]);// check if e-mail address is well-formed
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
$emailErr = “Invalid email format”;
}
}if (empty($_POST[“course”])) {
$course = “”;
}else {
$course = validateform($_POST[“course”]);
}if (empty($_POST[“class”])) {
$class = “”;
}else {
$class = validateform($_POST[“class”]);
}if (empty($_POST[“gender”])) {
$genderErr = “Gender is required”;
}else {
$gender = validateform($_POST[“gender”]);
}if (empty($_POST[“subject”])) {
$subjectErr = “You must select 1 or more”;
}else {
$subject = $_POST[“subject”];
}
}function validateform($data) {
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;
}
?><h2>Coderazaa.com classes registration</h2>
<p><span class = “error”>* required field.</span></p><form method = “POST” action = “<?php echo htmlspecialchars($_SERVER[“PHP_SELF”]);?>”>
<table>
<tr>
<td>Name:</td>
<td><input type = “text” name = “name”>
<span class = “error”>* <?php echo $name_error;?></span>
</td>
</tr><tr>
<td>E-mail: </td>
<td><input type = “text” name = “email”>
<span class = “error”>* <?php echo $emailErr;?></span>
</td>
</tr><tr>
<td>Time:</td>
<td> <input type = “text” name = “course”>
<span class = “error”><?php echo $websiteErr;?></span>
</td>
</tr><tr>
<td>Classes:</td>
<td> <textarea name = “class” rows = “5” cols = “40”></textarea></td>
</tr><tr>
<td>Gender:</td>
<td>
<input type = “radio” name = “gender” value = “female”>Female
<input type = “radio” name = “gender” value = “male”>Male
<span class = “error”>* <?php echo $genderErr;?></span>
</td>
</tr><tr>
<td>Course:</td>
<td>
<select name = “subject[]” size = “4” multiple>
<option value = “Android”>PHP</option>
<option value = “Android”>Android</option>
<option value = “Java”>Java</option>
<option value = “C#”>C#</option>
<option value = “Data Base”>Data Base</option>
<option value = “Hadoop”>Hadoop</option>
<option value = “VB script”>VB script</option>
</select>
</td>
</tr><tr>
<td>Agree to terms and conditions</td>
<td><input type = “checkbox” name = “checked” value = “1”></td>
<?php if(!isset($_POST[‘checked’])){ ?>
<span class = “error”>* <?phpYou must agree to terms”;?></span>
<?php } ?>
</tr><tr>
<td>
<input type = “submit” name = “submit” value = “Submit”>
</td>
</tr></table>
</form><?php
echo “<h2>Your given values are as :</h2>
echo “<p>Your name is $name</p>”;
echo “<p> your email address is $email</p>”;
echo “<p>Your class time at $course</p>”;
echo “<p>your class info $class </p>”;
echo “<p>your gender is $gender</p>”;for($i = 0; $i < count($subject); $i++) {
echo($subject[$i] . ” “);
}
?></body>
</html>
