How to display popup message when logged out user try to vote ?
Last Updated :
29 Jun, 2020
How users logged in or logged out is detected?
When a user satisfies the conditions for login his status changes to logged in. For a website or system to understand that a user is logged in usually a $_SESSION[‘ ‘] variable is set as soon as the user logs in. This variable when set helps the website to recognize that a user is present and provides access to all the available functionalities.
For example, when we log into a website it usually displays messages like:
WELCOME Name_Of_The_user
So how does this happen?
When users login to a website, the website recognizes the user and extracts the necessary information about the user from the database for proper functioning. At the same time $_SESSION[‘ ‘] variable is set to help every page on the website be aware that a user is in session or logged in.
So, if a user is not logged in, the $_SESSION[‘ ‘] variable is not set. To display a popup message when a user is logged out we simply need to run an if loop. When a user clicks on a button direct them to a PHP file or a function within the same file that checks whether the user is logged in or not.
Example: When PHP function exists inside the same file.
Consider the following code inside HTML file:
<!DOCTYPE html>
<html>
<head>
<title>
How to display popup message
when logged out user try to
vote?
</title>
</head>
<body>
<form method="POST" action="">
<p> VOTE HERE! </p>
<button type="submit">Vote </button>
</form>
<?php
if(!isset($_SESSION[''])) {
echo " <script type='text/javascript'>";
echo "alert('User not logged in!')";
echo " </script>";
}
?>
</body>
</html>
|
Output:
- Before Clicking on Vote button:
- After clicking on Vote button:
Example: When PHP function exists in another file.
Consider the following code inside HTML file:
<!DOCTYPE html>
<html>
<head>
<title>
How to display popup message
when logged out user try to
vote?
</title>
</head>
<body>
<form method="POST" action="check.php">
<p> VOTE HERE! </p>
<button type="submit">Vote </button>
</form>
</body>
</html>
|
Consider the following code inside the check.php file:
<?php
if(!isset($_SESSION[''])) {
echo "<script type='text/javascript'>";
echo "alert('User not logged in!')";
echo "</script>";
}
?>
|
Output:
- Before Clicking on Vote button:
- After clicking on Vote button:
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