As of SAP Release 6.10, the architecture of the SAP system has changed fundamentally. The application server in this architecture can act as a Web server and as a Web client. The new architecture is called SAP Web Application Server.
Access to these resources is driven by events. To allow activities such as data selection, initialization, or input processing before or after displaying a Web page, a BSP application provides several standard events.
To implement BSP applications, you use the Web Application Builder.
With the formatted XSF output you can use the SAP Web Application Server to send forms to the client by using an HTTP response. This means that you can display them in the Web browser:
1. The BSP page is called by the user or by a preceding BSP page. The Web Application Server forwards the HTTP request to the BSP runtime environment.
2. The BSP runtime environment triggers the Initialization event. In the relevant event handler OnInitialization you can now select data for your form - usually based on the entries the user made on the previous BSP page.
3. To generate HTML (with embedded CSS), specify the parameters of the Smart Forms function module and call it (see Output in HTML Format).
4. The function module returns HTML as a table in RAW format.
You can encapsulate the last two steps in a method or in another function module.
5. To display the form in the browser, use the SET_DATA method to fill the response object provided by the BSP runtime environment. This method expects the data as XSTRING. Convert the XSF output appropriately and pass the string to the response object:
* Variables for formatted XSF and conversion
data: ls_xmloutput type ssfxmlout,
lt_html_raw type tsfixml.
data: l_xstring type xstring, "needed for HTTP response
l_xlength type i,
l_html_xstring type xstring.
* ls_xmloutput has been returned by Smart Form
ls_xmloutput = ls_output_data-xmloutput.
lt_html_raw = ls_xmloutput-trfresult-content.
* Convert RAW to XSTRING
loop at lt_html_raw into l_xstring.
concatenate l_html_xstring l_xstring into l_html_xstring
in byte mode.
* Set header of response
response->set_header_field( name = 'content-type'
value = ls_xmloutput-trfresult-type ).
* Fill response object
l_xlength = xstrlen( l_html_xstring ).
response->set_data( data = l_html_xstring
length = l_xlength ).
In the BSP application SF_WEBFORM_01 you can display three different forms that have not been specially adapted to Web use.
The Web Application Server sends the XSF output to the browser.