In this article I will explain with an example, how to disable Browser Back Button after Logout using JavaScript in ASP.Net Core Razor Pages.
Note: For beginners in ASP.Net Core Razor Pages (.Net Core 7), please refer my article ASP.Net Core 7 Razor Pages: Hello World Tutorial with Sample Program example.
 
One cannot disable the Browser Back Button functionality only thing that can be done is prevent them.
 
 

Concept

In this article, two Razor Pages are used i.e. Logout and Home. After Logout, User is sent to Home Razor Page and he will be prevented from going back to Logout Razor Page using Browser Back Button.
 
 

Disable Browser Back Button using JavaScript function

The following JavaScript function must be placed inside the Razor Page where you want to prevent the User from coming back using Browser Back Button.
For example, consider two Razor Pages, Logout and Home and once User lands on the Logout Razor Page, you would not want him to go to Home Razor Page. Thus, the following script must be placed inside the Home Razor Page.
Inside the preventBack function, the window.history.forward() method is called which navigates the browser forward one step in their history. Whenever Browser Back Button is clicked, this function immediately moves it one step forward.
The setTimeout method schedules the execution time of the preventBack function with delay of 0 (zero) milliseconds.
Finally, the window.onunload function returns NULL.
<script type="text/javascript">
    function preventBack() {
        window.history.forward();
    }
    setTimeout("preventBack()", 0);
    window.onunload = function () {
        null;
    };
</script>
 
 

Razor PageModel (Code-Behind)

Home

The PageModel consists of the following Handler method.

Handler method for handling Home GET operation

This Handler method is left empty as it is not required.
public class HomeModel : PageModel
{
    public void OnGet()
    {
    }
}
 

Login

The PageModel consists of the following Handler method.

Handler method for handling Login GET operation

This Handler method is left empty as it is not required.
public class LogoutModel : PageModel
{
    public void OnGet()
    {
    }
}
 
 

Disable Browser Back Button implementation

Razor Page (HTML)

Home Razor Page

The Home Razor Page consists of an HTML Anchor tag and its href property is set to name of Logout Razor Page.
Finally, the script to disable the Browser Back Button is placed inside the HEAD section.
@page
@model Disable_Browser_Back_Logout_Core_Razor.HomeModel
@{
    Layout = null;
}
 
<!DOCTYPE html>
 
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Home</title>
    <script type="text/javascript">
        function preventBack() {
            window.history.forward();
        }
        setTimeout("preventBack()", 0);
        window.onunload = function () {
            null;
        };
    </script>
</head>
<body>
    <h3>Home</h3>
    <hr />
    <a href="/Logout">Logout</a>
</body>
</html>
 

Logout Razor Page

The Logout Razor Page consists of a H3 tag which displays the message that, this is Logout Razor Page.
@page
@model Disable_Browser_Back_Logout_Core_Razor.LogoutModel
@{
    Layout = null;
}
 
<!DOCTYPE html>
 
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Logout</title>
</head>
<body>
    <h3>Logout</h3>
</body>
</html>
 
 

Screenshot

ASP.Net Core Razor Pages: Disable Browser Back Button after Logout using JavaScript
 
 

Browser Compatibility

The above code has been tested in the following browsers.
Microsoft Edge  FireFox  Chrome  Safari  Opera
* All browser logos displayed above are property of their respective owners.
 
 

Demo

View Demo
 
 

Downloads

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