Prevent the page from creating additional dialogs undo


This article will explain how to prevent your web page from creating additional dialogues when users press the “Undo” button in their browser.

Users often accidentally create additional dialogues when they meant to navigate away from a page or close a window. This can be especially frustrating if they cannot return to the previous page or window.

There are two ways to prevent this from happening:

  1. Use the “beforeunload” event.
  2. Use the “unload” event.
    What is a dialogue?
    A dialog is a window that allows the user to enter information or choose an option. Dialogs are often used to ask the user to confirm an action, such as closing a web browser window or quitting the application.
    How do dialogs work?

    Dialogs are built using the jQuery UI Dialog Widget. When you create a dialog, you have the option to make it modal. A modal dialog prevents the user from interacting with the rest of the page until the dialog is closed. Modeless dialogs, on the other hand, allow users to interact with the page even while the dialog is open.

There are a few things to keep in mind when working with dialogs:

  1. The element you’re using to create the dialog must be an empty div.
  2. When you create a dialog, you specify which element will be used as the modal overlay (the element that blocks access to the rest of the page). Typically, this is an empty div that’s placed above everything else on the page.
  3. You can only have one modal dialog per page. Attempting to create more than one will result in an error.
    Why do some sites create additional dialogs?

    Some sites create additional dialogs when you try to leave them. The most common type is the “Are you sure you want to leave this site?” dialog. This usually happens if you’ve started filling out a form on the site and then try to leave before submitting it.

The site is basically asking if you’re sure you want to leave without completing the form. It’s up to you whether or not you want to answer this dialog. If you’re not sure what to do, you can always just click the “x” in the upper-right corner of the dialog to close it.

How can you prevent pages from creating additional dialogs?

The preventPages function disables the ability for pages to create additional dialogs. It takes a single parameter, which is the number of dialogs that the page is allowed to create. This function must be called before any other page dialog functions are called.


Preventing a page from creating additional dialogs is a simple task that can be accomplished by using the “beforeunload” event.

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