Working with actions on drop down

Question

Hi Gurus,
I have created a drop down box dynamically with fixed values using add_parameter_field. Now i want is when user selects particular value from the drop down box few fields should be disabled on the screen. Can you please help how to do this. i have added the code below
l_defdate_range-key = '1'."'01DAY'.
    l_defdate_range-value = 'Yesterday'.
    APPEND l_defdate_range TO lt_defdate_range.
    l_defdate_range-key = '2'."'15DAY'.
    l_defdate_range-value = 'Since 15 Days'.
    APPEND l_defdate_range TO lt_defdate_range.
    l_defdate_range-key = '3'."'30DAY'.
    l_defdate_range-value = 'Since 30 Days'.
    APPEND l_defdate_range TO lt_defdate_range.
    l_defdate_range-key = '4'."'MONTH'.
    l_defdate_range-value = 'Last Month'.
    APPEND l_defdate_range TO lt_defdate_range.
*--Default date range
    wd_this->m_handler->add_parameter_field(
        i_id = 'P_DEF_DT_RANGE'
        i_description = 'Default date range'
        it_value_set = lt_defdate_range
        i_as_dropdown = abap_true
        i_within_block = 'DATES'
        i_value = l_value ).
Thanks in advance

Answer 1

Hi.,
Assign a Function Code to List Box., let say  DRP .,
now in PAI.,
if sy-ucomm = 'DRP'.
read the value of List box.,
based on value ., disable the input fields.,
endif.,
for disabling input fields use
loop at screen.
if screen-group1 = 'SC1' " screen group which u assigned to input fields which u want to disable
screen-input = 0.
endif.
modify screen.
hope this helps ., u
Thanks & Regards,
Kiran