In a nutshell it works like this.
When a page loads all the values of all form inputs are serialised. If you do an action like navigating away from the page, the serialised values are compared with the current values. If they differ you get a dirty form warning.
Obviously some methods of navigating away from the page, like pressing the cancel or submit buttons, are exempted from this.
Some types of forms such as the quicksearch are also exempted.
If you want to disable it for forms in a plugin, I thought you could add some indicator class but I can't find it right now... using class=userpref-form should work but I don't think is the correct approach.
Does that help, or can you be more specific about your requirements?
i have one hyperlink in one page, which opens popup, which will add fill some value to page in which hyperlink is there. now i am gettin warning abt navigating away. this happens only in internet explorer. so i need whethr this is internet explorer prob or any modification required in process of creating popup?
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