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In: Computer Science

log in form Requirements: Form: There should be at least 2 input fields for username and...

log in form

Requirements:

Form:
- There should be at least 2 input fields for username and password.
Use an array as a database in which there are several usernames and passwords:
- Usernames can be either emails or nick names (WITHOUT WHITE SPACE)

After the user submitted the form, students must:
- sanitize the inputs
- check if there is a match with one username and one password in the array.
- If there is no match, print out an error message to user on the form.
- If it is a match, redirect the user to a welcome page.

//code to adjust

//code

<?php

if(isset($_GET['submit'])){

//sanitize the input

/* Check the error from the input:
if input from user is empty
-> get an error string variable
if input is not empty
-> use preg_match() to match the pattern
$pattern = "/^[1-9][0-9]{2}(\.|\-)[0-9]{3}(\.|\-)[0-9]{4}$/";
-> if it's a matched, get a success string variable
*/

   }
?>
<!doctype html>
<html lang="en">
<head>

<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css" integrity="sha384-JcKb8q3iqJ61gNV9KGb8thSsNjpSL0n8PARn9HuZOnIxN0hoP+VmmDGMN5t9UJ0Z" crossorigin="anonymous">
<link rel="stylesheet" href="">
<title>Lab 2-Part1</title>
</head>
<body>

<form action="" class="main-form needs-validation">
<div class="form-group">
<label for="numbers">Phone Number</label>
<input type="text" id="numbers" class="form-control" value=<?php //use PHP to print out the value the use typed in if any ?>>
<small class="form-text text-muted">xxx.xxx.xxx or xxx-xxx-xxxx</small>

      <div class="alert alert-danger">
          Must enter a valid phone number! 
          </div>
          <div class="alert alert-success">
          Phone number is valid! 
          </div>
</div>

<button type="submit" class="btn btn-primary" >Submit</button>
</form>

<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/umd/popper.min.js" integrity="sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js" integrity="sha384-B4gt1jrGC7Jh4AgTPSdUtOBvfO8shuf57BaghqFfPlYxofvL8/KUEfYiJOMMV+rV" crossorigin="anonymous"></script>
</body>
</html>

Expert Solution

Here is the answer for your question in PHP and HTML Languages.

Kindly upvote if you find the answer helpful.

#####################################################################

CODE :

loginForm.php

<?php

if(isset($_GET['submit'])){
//Create arrays
$usernames = array("user123","user345","[email protected]");
$passwords = array("12345","34567","89079");
//Get user input
$username = $_GET['username'];
$password = $_GET['password'];
$phnNumber = $_GET['numbers'];
$error = "";
$success = "";

//sanitize the input
/* Check the error from the input:
if input from user is empty
-> get an error string variable
if input is not empty
-> use preg_match() to match the pattern
$pattern = "/^[1-9][0-9]{2}(\.|\-)[0-9]{3}(\.|\-)[0-9]{4}$/";
-> if it's a matched, get a success string variable
*/
$pattern = "/^[1-9][0-9]{2}(\.|\-)[0-9]{3}(\.|\-)[0-9]{4}$/";
if(empty($phnNumber)){
$error = "Must enter a valid phone number!";
}else if(preg_match($pattern,$phnNumber) != 1){
$error = "Must enter a valid phone number!";
}else{
//If phone number is correct
$success .= "Phone number is valid!";
$matched = 0;
//Check whether username and password given y user matches any array values.
for($i = 0;$i<count($usernames);$i++){
if((strcmp($usernames[$i],$username) == 0) && (strcmp($passwords[$i],$password) == 0)){
$matched = 1;
}
}
//If matched
if($matched == 1){
//Alert success message and redirect to welcome page
echo "<script>alert('Successfully Logged In');</script>";
echo "<script>window.location.href = 'welcome.html';</script>";

}else{
//Alert error message
echo "<script>alert('Invalid Credentials...Try again');</script>";
}
}

}
?>
<!doctype html>
<html lang="en">
<head>

<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css" integrity="sha384-JcKb8q3iqJ61gNV9KGb8thSsNjpSL0n8PARn9HuZOnIxN0hoP+VmmDGMN5t9UJ0Z" crossorigin="anonymous">
<link rel="stylesheet" href="">
<title>Lab 2-Part1</title>
<style>
label{
padding : 20px;
}
</style>
</head>
<body>

<form action="<?php echo $_SERVER['PHP_SELF'];?>" class="main-form needs-validation" method="GET">
<div class="form-group">
<label for="username">User Name : </label><input type="text" name="username" class="form-control"required/><br/>
<label for="password">Password : </label><input type="password" name="password" class="form-control"required/><br/>
<label for="numbers">Phone Number</label>
<input type="text" name="numbers" class="form-control" value=<?php //use PHP to print out the value the use typed in if any ?>>
<small class="form-text text-muted">xxx.xxx.xxx or xxx-xxx-xxxx</small>

<div class="alert alert-danger" id="error">
<?php
if(!empty($error)){
echo $error;
}
?>
</div>
<div class="alert alert-success" id="success">
<?php
if(!empty($success)){
echo $success;
}
?>

</div>
</div>

<button type="submit" name='submit' class="btn btn-primary" >Submit</button>
</form>

<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/umd/popper.min.js" integrity="sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js" integrity="sha384-B4gt1jrGC7Jh4AgTPSdUtOBvfO8shuf57BaghqFfPlYxofvL8/KUEfYiJOMMV+rV" crossorigin="anonymous"></script>
</body>
</html>

#########################################################################

welcome.html

<!DOCTYPE html>
<html>
<head>
<title>WELCOME PAGE</title>
</head>
<body>
<center>
<h1 style="color:green;">Congratulations</h1>
<h1 style="color:yellow;">Logged In successfullt</h1>
</center>
</body>
</html>

#################################################################

SCREENSHOTS :

Please see the screenshots of the code below for the indentations of the code.

loginForm.php

###########################################################################

welcome.html

############################################################################

OUTPUT :

Initially the page looks like,

When you give any username and password but empty phone number,

when you click "submit",

When you give any user name and password but invalid Phone number,

Whe you click on "submit",

Whe you give valid phone number but invalid username and passwords.

An alert message wil be displayed

Given all valid values,(Please check the arrays in code to enter valid values)

Redirected to welcome.html page,

Any doubts regarding this can be explained with pleasure :)

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