In BSP how to give the input field as mandatory?

Hi friends,
In BSP how to give the input field as mandatory?
In BSP i want to validate the input field (example checking the material no is valid or not)
if this material no doesnot exit means i want to pass error message.What is the code for that.
Moosa

hi
try this
in LAYOUT
<htmlb:inputField id = "vname" disabled = "False" value = "<%= v_visitor %>"/> <font color="red" size="2"><b><%= page->messages->assert_message( 'vname' ) %></b></font></td>
in DO_HANDLE_EVENT
in oninputprocessing
CLASS CL_HTMLB_MANAGER DEFINITION LOAD.
IF event_id = CL_HTMLB_MANAGER=>EVENT_ID.
DATA: event TYPE REF TO CL_HTMLB_EVENT.
event = CL_HTMLB_MANAGER=>get_event( runtime->server->request ).
IF event->name = 'button' AND event->event_type = 'click'.
    DATA: button_event TYPE REF TO CL_HTMLB_EVENT_BUTTON.
    button_event ?= event.
ENDIF.
    case event->id.
        when 'select'.
           if v_visitor = ''.
             page->messages->add_message(
             condition = 'vname'
             message   = 'Visitor Name can not be blank'
             severity = page->messages->CO_SEVERITY_ERROR ).
          ELSE.
                here u can write ur when ur field getting filled
        endif.
     endcase.
endif.
give marks if it is helpful
thanks

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In BSP how to give the input field as mandatory?

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