Alert with multiple options

Question

Just wondering, is it possible to create an alert with multiple options?

Like for example, in Facebook, when you try to close the tab/window when you have not finished typing your message, an alert with the options "Leave this page" and "Stay on this page" will pop up.

Answer 1

Example with form, you'are looking for window.onbeforeunload:

<script type="text/javascript">
var originalFormContent
var checkForChanges = true;

jQuery(document).ready(function () {
    originalFormContent = jQuery('#myForm input[type=text]').serialize() +      jQuery('#myForm select').serialize();
});

function onClose() {

    if (checkForChanges && originalFormContent != "undefined") {
        var content = jQuery('#myForm input[type=text]').serialize() + jQuery('#myForm select').serialize();
        if (content != originalFormContent) {

            return confirm('You have unsaved changes.  Click OK if you wish to continue ,click Cancel to return to your form.');
        }
    }

}

window.onbeforeunload = onClose(); 

Answer 2

You're referring to window.onbeforeunload:

Best way to detect when a user leaves a web page?

You can also use the window.confirm() function for OK/Cancel options:

http://jsfiddle.net/UFw4k/1

Other than that, you'd have to implement a custom modal alert, such as jQuery Dialog.