Technical Articles
abap2UI5 – (6/7) Installation, Configuration & Debugging
Welcome to part six of this blog series introducing abap2UI5 — an open-source project for developing standalone UI5 apps in pure ABAP.
This post explains how to install, configure and debug abap2UI5.
Find all the information about the project on GitHub and stay up-to-date by following on Twitter.
Blog Series
Installation
1. Install the project with abapGit
For an on-premise system, you can use this Tutorial. In a cloud environment, you can follow this SAP Developer Tutorial. The project is based on a single code line for both language versions (ABAP Cloud, Standard ABAP), so you can clone this main branch in both cases. For lower releases (NW 7.03 to 7.40) use this downport repository.
2. Create a new HTTP Service
Next, create a new HTTP service in your system. In an on-premise environment, you need to create and configure a new ICF service. Follow this guideline for that and see how to develop a new HTTP request handler here. In a cloud scenario, follow this tutorial.
3. Develop a new HTTP Request Handler
Now copy the following implementation into your new handler method.
ABAP Standard:
METHOD if_http_extension~handle_request.
DATA lt_header TYPE tihttpnvp.
server->request->get_header_fields( CHANGING fields = lt_header ).
DATA lt_param TYPE tihttpnvp.
server->request->get_form_fields( CHANGING fields = lt_param ).
z2ui5_cl_http_handler=>client = VALUE #(
t_header = lt_header
t_param = lt_param
body = server->request->get_cdata( ) ).
DATA(lv_resp) = SWITCH #( server->request->get_method( )
WHEN 'GET' THEN z2ui5_cl_http_handler=>http_get( )
WHEN 'POST' THEN z2ui5_cl_http_handler=>http_post( ) ).
server->response->set_cdata( lv_resp ).
server->response->set_status( code = 200 reason = 'success' ).
ENDMETHOD.
ABAP Cloud:
METHOD if_http_service_extension~handle_request.
z2ui5_cl_http_handler=>client = VALUE #(
t_header = request->get_header_fields( )
t_param = request->get_form_fields( )
body = request->get_text( ) ).
DATA(lv_resp) = SWITCH #( request->get_method( )
WHEN 'GET' THEN z2ui5_cl_http_handler=>http_get( )
WHEN 'POST' THEN z2ui5_cl_http_handler=>http_post( ) ).
response->set_status( 200 )->set_text( lv_resp ).
ENDMETHOD.
By calling your new HTTP handler via browser, you can start abap2UI5 and see the landing page:
abap2UI5 Landing Page
And continue to the demo section:
abap2UI5 Demo Section
Next check out this first blog post to see how to start developing your apps.
Configuration
Options and URL Parameters
There are two ways to set the configuration: one is by setting it via URL parameter, and the other option is by importing it as a configuration by calling the index HTML.
By default, the following parameters are set:
lt_config = VALUE #(
( name = `data-sap-ui-theme` value = `sap_horizon` )
( name = `src` value = `https://sdk.openui5.org/resources/sap-ui-core.js` )
( name = `data-sap-ui-libs` value = `sap.m` )
( name = `data-sap-ui-bindingSyntax` value = `complex` )
( name = `data-sap-ui-frameOptions` value = `trusted` )
( name = `data-sap-ui-compatVersion` value = `edge` ) ).
If you want to make changes, simply copy the table, adjust the necessary parameters and then import the table again when calling the method:
DATA(lt_config) = VALUE z2ui5_if_client=>ty_t_name_value(
( name = `data-sap-ui-theme` value = `sap_belize` ) "<- adjusted
( name = `src` value = `https://sdk.openui5.org/resources/sap-ui-core.js` )
( name = `data-sap-ui-libs` value = `sap.m` )
( name = `data-sap-ui-bindingSyntax` value = `complex` )
( name = `data-sap-ui-frameOptions` value = `trusted` )
( name = `data-sap-ui-compatVersion` value = `edge` ) ).
DATA(lv_resp) = SWITCH #( request->get_method( )
WHEN 'GET' THEN z2ui5_cl_http_handler=>http_get(
t_config = lt_config )
WHEN 'POST' THEN z2ui5_cl_http_handler=>http_post( ) ).
Title
You can the title in the app implementation:
client->set_next( VALUE #( title = 'My Title' ) ).
abap2UI5 with changed title
You can find a list of all configuration parameters here. Additionally, you can modify these parameters with the sap-ui- prefix to use them as URL parameters.
Customizing
To synchronize the configuration with all other UI5 apps in your system, you can use the following customizing and read this table before the method call (enjoy the view, this is the only SAP GUI screenshot included in this blog series 😉):
Configuration SAP UI5 Bootstrapping
Theme
The most common change is to the theme. You can find all available themes here. The newest theme is Horizon (sap_horizon) and it is used in all the demos of this blog series. Other popular themes are:
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Belize (sap_belize) | Quartz Light (sap_fiori_3) |
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Evening Horizon (sap_horizon_dark) | High Contrast Black (sap_horizon_hcb) |
Bootstrapping
In an on-premise landscape, you can bootstrap the UI5 library from your local system. Typically, the path is “/sap/public/bc/ui5_ui5/resources/sap-ui-core.js” or “resources/sap-ui-core.js”. In a cloud scenario, you can refer to SAP guidelines available here.
Launchpad
Abap2UI5 is based on a single-page index.html, which makes it not compatible with FLP out of the box (since FLP replaces the index.html). However, it is possible to encapsulate abap2UI5 in a UI5 standard app. Note that there is still some work to do but if you want to try out this approach or contribute to the project, check out this issue.
CSS
You can change the CSS by sending HTML with you View in your app. An example can be found here:
abap2UI5 app with changed CSS
Security
At the backend, abap2UI5 is a plain HTTP handler that every user creates and configures by themselves (visibility, authentication & other security parameters). In the implementation of your apps you have to take care of a secure programming style like always when developing HTTP-Handlers (call authorization checks, avoid dynamic SQL etc.). Check this for more information.
At the frontend, abap2UI5 is a normal one page UI5 application. It loads the external library UI5 from a CDN or your own customized directory. The UI5 framework is used to render the HTML and only methods of the UI5 framework are called to handle the all events.
Additionally to prevent cross-site-scripting the following parameter are set in the index.html:
`<meta http-equiv="Content-Security-Policy" content="default-src 'self' 'unsafe-inline' 'unsafe-eval' ui5.sap.com *.ui5.sap.com sdk.openui5.org *.sdk.openui5.org cdn.jsdelivr.net *.cdn.jsdelivr.net"/>`.
It only allows libraries from the same server, ui5.sap.com, openui5.com or cdn.jsdelivr.net, which we needed to show barcodes. Adjust the importing parameter ‘content-security-policy’ when you want to include more libraries:
DATA(lv_resp) = SWITCH #( request->get_method( )
WHEN 'GET' THEN z2ui5_cl_http_handler=>http_get(
content_security_policy = `<meta http-equiv="Content-Security-Policy" content="default-src 'self' 'unsafe-inline' 'unsafe-eval' ui5.sap.com *.ui5.sap.com sdk.openui5.org *.sdk.openui5.org cdn.jsdelivr.net *.cdn.jsdelivr.net"/>` )
WHEN 'POST' THEN z2ui5_cl_http_handler=>http_post( ) ).
More information about CSP you can find here.
Debugging
When your app is in the development process, you can activate logging by changing the following parameter:
DATA(lv_resp) = SWITCH #( request->get_method( )
WHEN 'GET' THEN z2ui5_cl_http_handler=>http_get(
check_logging = abap_true )
WHEN 'POST' THEN z2ui5_cl_http_handler=>http_post( ) ).
Frontend
XML-View
Most of the issues arise because the XML is not valid. You can check it there or copy & paste it to an XML validator. Another good way to test the XML are UI5 sandboxes, such as the OpenUI5 Sandbox.
Next, you can scroll up a little bit to check the remainder of the previous response.
Response Object
If a parameter is bound with _bind_one, it should be written in the oViewModel. If a parameter is bound with _bind, it should be written in oUpdate. You can also check the last request to ensure that all updated values have been sent to the server.
Request Object
To take a more detailed look at the UI, use the UI5 Inspector. This tool is helpful for analyzing and checking certain controls:
UI5 Inspector with an abap2UI5 app
You can find more guidelines here.
Also, keep in mind that abap2UI5 is based on REST, so you don’t need to restart the app all the time after a change, like in the former screen logic where changes were only visible after restarting. Just triggering a server roundtrip is enough to see the changes:
View Development in abap2UI5
Backend
Set a breakpoint in your app and check the values that abap2UI5 provides you, as well as the values you give back to abap2UI5. Check if the view XML is filled and if it is valid. Normally, abap2UI5 throws an exception if something unexpected happens, which can help you to identify the problem. If you want to gain a deeper understanding, you can also debug the framework itself.
The framework is based on a single http handler. Set a breakpoint here and check incoming requests and outgoing responses:
abap2UI5 HTTP Handler
The initial request loads the UI5 index.html, which is independent of your application and should normally not cause any problems:
abap2UI5 Get Handler (index.html)
After this, the AJAX roundtrip logic begins. Every event and interaction creates a new HTTP Post request, which triggers the following method:
abap2UI5 Post Handler
As you can see, we call the user’s app on line 44. You can also check if your app has been successfully updated after the frontend on line 39 and check the following method:
Update app after frontend (PAI)
And the reverse direction, setting the response with the values of your app in this method:
Create frontend model before output (PBO)
If you find a bug in the framework or running into problems with your app, feel free to open an issue.
Summary
This was part six of this introduction to abap2UI5. You now have an understanding how to install & configure it and got insights into troubleshooting & debugging.
In the final blog post, we will focus on the technical background of this framework and summarize all the project’s key ideas by covering topics such as its architecture, codebase and compatibility.
Thank you for reading this blog post!
Your questions, comments and wishes for this project are always welcome, create an issue or leave a comment.
Hi all!
When I select “Pull” to copy all objects from the Git repository into the SAP system.
I get message "Error from DDIF_TABL_PUT", has anyone ever received such an error?
I'd suggest to raise an issue in the git repo.
ABAP2UI5
BR Christian
Hello,
I'm having trouble with creating services and running demos with SICF. I created the service using the given method, but when I test it, I get Internal service 500 error. Do you have any ideas?
Hi Baris, thank you for trying this out, I had to make some changes in the startup process, can you pull the actual version one more time and try again? Best Regards.
Thanks for quick reply. It's working now. Regards
Hello error in class Z2UI5_CL_XML_VIEW method XML_GET
No type can be derived from the context for the operator "REDUCE". I'm on 740 system but i don't find this class in 702 repository.
could you please help.?
I don't know the new syntax (i work on add-on partner and we must be compatible 702 system).
DATA(lv_tmp3) = REDUCE #( INIT val = `` FOR row IN mt_prop WHERE ( v <> `` )
NEXT val = |{ val } { row-n }="{ escape( val = COND string( WHEN row-v = abap_true THEN `true` ELSE row-v ) format = cl_abap_format=>e_xml_attr ) }" \n | ).
Oh yes, the downported v702 branch is not up to date anymore. I will fix this in the next days and let you know again.
Hello thanks.
temporary I declare lv_tmp3 with type string and it's work.
The downport repository is updated now:
https://github.com/oblomov-dev/abap2UI5-downport
Can't access the tutorial page
The blog is updated, this is the new link:
https://docs.abapgit.org/user-guide/getting-started/install.html