How to popup confirm dialog trying to navigate away with unsaved changes

Is there any generic or built-in solutions for this common requirement?
JDev: 11g
any idea or material on this is appreciated.
Thanks.
Kevin.

try capturing the onBeforeUnload event and display a modal confirmation dialog asking the user if he really wants to navigate away from the page; and warning him that if he does so, all the changes he made hitherto will be gone.
However, you need to handle this intelligently since you need to identify if any fields in the form have changed and only then warn the user to confirm his decision to go away from this page.
You can do this by having a flag which is initialized to false but when onBeforeUnload event is fired, you would check if any of the form fields in the page have changed by iterating over each and every form field,and then setting the flag to true if some thing changed
the onBeforeUnload Handler will always return this flag, if it is true, you will get this confirmation popup, else the page will go away. To show a customized confirmation dialog, perhaps you would have to invoke the custom dialog call from with in the onBeforeUnload handler. When the user says yes, return false;else true.

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How to popup confirm dialog trying to navigate away with unsaved changes

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