Hi,
I would like to open a hidden popup window to pass value when user enter the value on the textbox. The popup window will perform operation that call the javabean to retrieve values to be displayed on the form that open the window.

how to pass values from popup window to the form

Rethink your architecture. Ever more people block all popups on general principle as 99% of them are advertising.
Use a 0-sized div on your page instead.

can i use hidden iframe then. if so how to apply

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