How to check for dirty fields in ADF-BC application

Hi,
I am using JDev 11.1.1.3 version and ADF/BC.
In my poc,one of my flows have a scenario as below.
I have a train with 3 stops.
In the first train stop page,I display a page[binded with view] with a form having input fields and having save/cancel fields.
When any of the input fields are changed in the first train page and when I navigate to any other page in the train flow,I need to display an alert message
that the data in the page has been changed.
Kindly advice me on how to achieve this.
If no fields are changed I need not display any alert message.
Please suggest.
Thanks,
Praveen

I'm not sure if this works with trains but check out the uncommittedDataWarning property http://one-size-doesnt-fit-all.blogspot.com/2010/02/adf-faces-rc-afdocument.html
Timo

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Since you need to basically check if the field has a value or not, i dnt think you need to check for the length of the field. Instead, you can use any one of the booloean functions available in the graphical mapping editor to check if the field has a value or not(filed value true or false)
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