Differences between on chain-input & on chain-request

Hi All,
Cany any one explain the difference between on chain-input & on chain-request ( or on input & on request).
Cheers...
@Syam
Moderator Message: Read the F1 documentation. Thread locked.
Edited by: Suhas Saha on Nov 16, 2011 1:24 PM

Hi Kal,
Let me try and put it into perspective.
On Input (When value changes from initial value):
Here e.g. you have a screen field which has a character field. Initial value of a character field is space. When you enter the screen for the first time, suppose the field is blank (initial value), then user enters some value ('XYZ') in the field, in such an event, the MODULE ON CHAIN-INPUT would get triggered, since the value has changed from initial value to 'XYZ'.
However, now say the user changes the value from 'XYZ' to 'AAA'. In this case, the MODULE ON CHAIN-INPUT will NOT get triggered because the original value was not initial i.e. space.
However, as most applications demand, you would want to trigger the MODULE when there is any changes in the field value. In such instances, you do a MODULE ON CHAIN-REQUEST which is triggered when there is any change in value of screen field.
Hence, ON REQUEST is a superset of ON INPUT, so to say that ON REQUEST is also triggered when value is changed from initial (as in ON INPUT) however ON INPUT is not triggrered when value is changed from non-initial, whereas ON REQUEST modules are triggered.
I hope this makes it clearer.
Regards,
Aditya

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Hi Experts
               Can you pls explain me whats the difference between
    on chain-request and on chain-input.
            I tried both in a situation, but not able to find the differenciation.
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POINT WILL BE REWARDED.

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