Question on issuing a error message

[Former Member]

HI All,

I am new to WDA. I am developing a WDA application, on the first view I have a table and a button to go to the next view.

When the table is empty i need to issue a error message in the message area and the user should not be able to navigate further using the NEXT button.

I want to display this message before the user does some action i.e ( before the button trigger ).

Can some one help me how to achieve this.

Thanks,

Krishna

[Former Member · Accepted solution]

i need to issue a error message in the message area and the user should not be able to navigate further using the NEXT button.

now if ls_cn_input is INITIAL , u need to generate a error message and disable ur NEXT button

//for generating the error message 
// this can be done by code wizard ( cntrl +f7) as well by selecting the radio button generate message and select the 
// method *report_error_message*
*    DATA lv_message  TYPE string .
**     get message manager
*    DATA lo_api_controller     TYPE REF TO if_wd_controller.
*    DATA lo_message_manager    TYPE REF TO if_wd_message_manager.
*
*    lo_api_controller ?= wd_this->wd_get_api( ).
*
*    CALL METHOD lo_api_controller->get_message_manager
*      RECEIVING
*        message_manager = lo_message_manager .
*
*
*
**     report message
*    CALL METHOD lo_message_manager->report_error_message
*      EXPORTING
*        message_text   = 'Please enter data before exit .'. 
// ur error message

the user should not be able to navigate further using the NEXT button. 

// disable the NEXT button

u procced as follows :

1 create a context attribute of type WDY_BOOLEAN

2 bind this with ur button UI

3 nw using set_attribute method , set its value to ' ' ( ie blank)

again this cn be donr thru code wizrd by selecting read context node/attribute

DATA lo_nd_cn_node TYPE REF TO if_wd_context_node.
    DATA lo_el_cn_node TYPE REF TO if_wd_context_element.
    DATA ls_cn_node TYPE wd_this->element_cn_node .
    DATA lv_attr  LIKE ls_city-ca_attr.
*   navigate from <CONTEXT> to <CN_VISIBLE> via lead selection
    lo_nd_node = wd_context->get_child_node( name = wd_this->wdctx_ca_attr).
 
*   get element via lead selection
    lo_el_cn_node = lo_nd_cn_node->get_element(  ).
 
*   set single attribute
    lo_el_cn_node->set_attribute(
      EXPORTING
        name =  `CA_ATTR`
 
        value = ' '  ).

// I have read ca_attr attribute under context node cn_node

// this attribute is binded to button UI

I hope it helps

rgds,

amit

[Former Member · Accepted solution]

Hi,

I all thanks for your reply.

I dont want to disable the button, I want to throw an error message in the message area.

I am looking for some functionality like REPORT_ATTRIBUTE_MESSAGE which will not allow any further actions. can it be done similarly?

Thanks,

Krishna

[Former Member · Accepted solution]

hi,

Follow these steps :

1. Get the node data into an internal table using get_Static_attribute_table method.

2. Use if endif condition to check whether internal table is empty.

3. IF table is empty throw an error message.

For throwing error message , you could use Code Wizard (control + F7 ).

Refer this code :

DATA lo_nd_cn_sflight TYPE REF TO if_wd_context_node.
  DATA lo_el_cn_sflight TYPE REF TO if_wd_context_element.
  DATA lt_cn_sflight TYPE wd_this->elements_cn_sflight.
* navigate from <CONTEXT> to <CN_SFLIGHT> via lead selection
  lo_nd_cn_sflight = wd_context->get_child_node( name = wd_this->wdctx_cn_sflight ).
  lo_nd_cn_sflight->get_static_attributes_table( IMPORTING table = lt_cn_sflight ) .
  lo_el_cn_sflight = lo_nd_cn_sflight->get_element( ).
  if lt_cn_sflight is INITIAL.

*   get message manager
    data lo_api_controller     type ref to if_wd_controller.
    data lo_message_manager    type ref to if_wd_message_manager.

    lo_api_controller ?= wd_This->Wd_Get_Api( ).

    CALL METHOD lo_api_controller->GET_MESSAGE_MANAGER
      RECEIVING
        MESSAGE_MANAGER = lo_message_manager.
*   report message
    CALL METHOD lo_message_manager->REPORT_ATTRIBUTE_ERROR_MESSAGE
      EXPORTING
        MESSAGE_TEXT      = 'Error message'
        ELEMENT           = lo_el_cn_sflight
        ATTRIBUTE_NAME    = 'CONNID'
        CANCEL_NAVIGATION = 'X'.

  endif.

[Former Member · Accepted solution]

I am looking for some functionality like REPORT_ATTRIBUTE_MESSAGE which will not allow any further actions.

1 first of all raise ur error message using the methods raise_error_message or report_Attribute_error_message as mentioned in the earlier replies

2 to stop further actions , u read the node cn_node which is binded to table UI and check like this :

CHECK ls_cn_node IS NOT INITIAL.
// this will stop further actions

I hope it wud sort ur problem

rgds,

amit

[Former Member · Accepted solution]

Hi,

i think u have got a lot details regarding the error message.

so now for stoping any further actions

go thru this thread

go for thomas reply also in it.

and try if something you can find from it.

[Former Member · Accepted solution]

Hi Saurav,

Thanks for your reply. But this code will eventually dump because

lo_el_cn_sflight = lo_nd_cn_sflight->get_element( ).

lo_el_cn_Sflight will be null.

Thanks,

krishna

[Former Member · Accepted solution]

Hi Amit,

Thanks for the details.

As you said I am displaying the error message in the message area and it stays there for some time.

Now i am facing one more problem when is scroll the table i mean the horizontal scroll bar on empty table,

it disappears from the message area.

lv_text_m01 = wd_assist->if_wd_component_assistance~get_text( 'M01' ).

• get message manager

DATA lo_api_controller TYPE REF TO if_wd_controller.

DATA lo_message_manager TYPE REF TO if_wd_message_manager.

lo_api_controller ?= wd_this->wd_get_api( ).

CALL METHOD lo_api_controller->get_message_manager

RECEIVING

message_manager = lo_message_manager.

• report message

CALL METHOD lo_message_manager->report_error_message

EXPORTING

message_text = lv_text_m01.

Thanks,

Krishna

[Former Member · Accepted solution]

hi ,

bring the message area in another transparent container

this shud solve the problem , I mean error message shud not disappear

rgds,

amit

[Former Member · Accepted solution]

Hi Amit,

I tried that way its still disappearing.

Thanks,

Krishna

[Former Member]

hi ,

u proceed like this :

When the table is empty
// chaeck whether the table is empty or not  by reading the context node which is binded to ur table UI
// this can be done by pressing control + f7 and selecting the radio button read context node/attribute
// ie thru code wizard

DATA : lo_nd_cn_input  TYPE REF TO if_wd_context_node ,
         lo_el_cn_input  TYPE REF TO if_wd_context_element ,
         ls_cn_input     TYPE wd_this->element_cn_input ,
         ls_cn_input1    TYPE wd_this->element_cn_input.

*    navigate from <CONTEXT> to <CN_INPUT> via lead selection
  lo_nd_cn_input = wd_context->get_child_node(
  name = wd_this->wdctx_cn_input ).

*    get element via lead selection
  lo_el_cn_input = lo_nd_cn_input->get_element(  ).

*     get all declared attributes
  lo_el_cn_input->get_static_attributes(
    IMPORTING
      static_attributes = ls_cn_input ).
// use IF condition to check if table is empty or not
// I am reading the node cn_input binded to TABLE UI

IF ls_cn_input is INITIAL.
// u need to raise the error message
// diable the NEXT button
ELSE.
// write ur logic to proceed further

rgds,

amit

[Former Member]

Hi Krishnakumar,

When the table is empty i need to issue a error message in the message area and the user should not be able to navigate further using the NEXT button

When the table is empty, u can display the message inside the table with the Table UI Attribute and u can disable the NEXT Button by linking it with the context.

Ranganathan.