How to do the feild validations in web dynpro abap

Question

dear all,
how to do the feild validations for the screen in web dynpro abap.
thanks,
jyothi.

Answer 1

hi jyothi,
There are diffrent ways of doing validations for fields of screen in webdynpro abap depending on the requirements.
I am giving simplest way of doing this validation(it may fullfil your requirement also)
For e.g you want that without entering value in particular field user should not proceed to submit the data in screen.
  DATA lo_message_manager    TYPE REF TO if_wd_message_manager.
  DATA lo_api_controller     TYPE REF TO if_wd_controller.
  lo_api_controller ?= wd_this->wd_get_api( ).
  lo_message_manager = lo_api_controller->get_message_manager( ).
  DATA var1 type string.
  DATA: node TYPE REF TO if_wd_context_node.
  node = wd_context->get_child_node( 'DATA' ).
  node->get_attribute( EXPORTING name = ' VALUE'
                         IMPORTING value =     var1 ).
IF var1  IS INITIAL.
    CALL METHOD lo_message_manager->report_error_message
      EXPORTING
        message_text = 'Please enter the value'.
      EXIT.
  ENDIF.
Now in above code VALUE is the attribute with whome your input field is bound .So if user doesnt enter any value into it he will get above msg (u have to use message are ui element to use this method)
If you have any other doubt feel free to ask.
regards
Panky