Data Validation in web dynpro

[Former Member]

Hi,

Can anyone explain how to do data validation for the i/p fields in the WD View???Pleasegive an example with coding.

Thanks!

[shaik_sajid]

hi

for any action or event in ur program the flow will be

wddobeforeaction

Action

wddoafteraction

and then other methods....So normally all validations will be written in the method wddobeforeaction

Regards

Sajid

[Former Member]

Hi,

As Thomas pointed out in his reply that do the validation at WDDOBEFOREACTION method

say you have a date to validate:

DATA lo_nd_importing TYPE REF TO if_wd_context_node.

DATA lo_el_importing TYPE REF TO if_wd_context_element.

DATA ls_importing TYPE wd_this->element_importing.

DATA lv_startdate LIKE ls_importing-startdate.

• navigate from <CONTEXT> to <IMPORTING> via lead selection

lo_nd_importing = wd_context->get_child_node( name = wd_this->wdctx_importing ).

• get element via lead selection

lo_el_importing = lo_nd_importing->get_element( ).

• get single attribute

lo_el_importing->get_attribute(

EXPORTING

name = `STARTDATE`

IMPORTING

value = lv_startdate ).

if lv_startdate 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_error_message

EXPORTING

message_text = 'Please input start date'

• params =

• msg_user_data =

• is_permanent = ABAP_FALSE

• scope_permanent_msg = CO_MSG_SCOPE_CONTROLLER

• view =

• show_as_popup =

• controller_permanent_msg =

• msg_index =

cancel_navigation = 'X' "this parameter will stop the program at the same view

.

endif.

this will stop the user at the same view and will give the error message out.....

you can also check the code wizard and try different type of methods to give out the error messages....the code wizard is right beside the external break point button...

Thanks...

AS.

[thomas_jung]

What kind of data validation do you want? For application specific validation, all the data from input is automatically restored back into the context during each server event. You simply must read the context and perform the logic you want to take place.

Error messages are issued using the Message Manager:

http://help.sap.com/saphelp_nw70ehp1/helpdata/en/d8/2a934259a5cb6ae10000000a155106/frameset.htm

If you want to do other types of validations - say for instance Required Field checks; there are SAP provided APIs to help with that:

http://help.sap.com/saphelp_nw70ehp1/helpdata/en/d7/ef8841e3af1609e10000000a155106/frameset.htm

Second section: Checking Required Entry Fields

Also for validation related logic - study the phase model:

http://help.sap.com/saphelp_nw70ehp1/helpdata/en/d2/8acd409cc4dd50e10000000a1550b0/frameset.htm

In particular the method of the phase model WDDOBEFOREACTION. This is generally where you perform custom validation so that error messages can break the flow of the event.

[Former Member]

Hi,

Say you have an input field,Field1.

Get value entered by the user through,Get_attribute method.

• get single attribute

lo_el_nd_<node_name>->get_attribute(

EXPORTING

name = <Attribute_name>

IMPORTING

value = lv_attr ).

Then check the value with ur req.validation, if yes,throw error meaage as

MESSAGE e<err_no>(<package_name>) INTO lv_message.

CALL FUNCTION 'BALW_BAPIRETURN_GET2'

EXPORTING

type = sy-msgty

cl = sy-msgid

number = sy-msgno

par1 = sy-msgv1

par2 = sy-msgv2

par3 = sy-msgv3

par4 = sy-msgv4

IMPORTING

return = ls_return.

Now your ls_retrurn-message will have your message text.

Thanks,

Divya.S

[Former Member]

sir even i want to validate the data .

like i have username and password input fields in The view of a webdynpro component .

and i have already a table in my se11 which i created named 'zuserpass'. with fields zusername and zpassword.

i have created a node in view context with the data dictionary 'zuserpass' and added 2 attributes zusername and zpassword .

now if user enters any values in the WD application , then it should check or validate the data from table which i created in the se11 named 'zuserpass' .

and i should display a succesfully logon message .

can u plz try this ?

[amy_king]

Hi Praveen,

Why are you manually authenticating user logon data? It would be advisable instead to delegate this task to the ICF and use the logon procedures that are available in transaction SICF. Please refer to Maintaining Logon Procedures - User Authentication and Single Sign-On - SAP Library.

Cheers,

Amy

[Former Member]

Hi Amy King,

Can you please help me out with the requirement .

I have a custom table with data....i want those fields in my view..and i want to validate at view level.. with my data in table....