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‎docs/technical/technology/ui5.md

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@@ -12,41 +12,33 @@ This page provides a structured technical comparison between **UI5 Freestyle** a
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| Aspect | UI5 Freestyle (MVC) | abap2UI5 |
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|-------------------|-------------------------------------------------------------|------------------------------------------------------------|
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| **Backend Stack** | ABAP services (OData/REST), loosely coupled | ABAP Classes generating XML Views and JSON ViewModels |
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| **Frontend Stack**| UI5 app (JavaScript, XML, Controller) | Static UI5 Shell |
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| **Frontend Stack**| UI5 Freestyle app (JavaScript, XML, Controller) | UI5 Freestyle App Static |
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| **Rendering** | View rendered by frontend controller | UI structure defined by backend, rendered in frontend |
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| **UI Definition** | XML Views maintained in frontend project | XML Views created directly in ABAP |
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| **Communication** | OData or custom AJAX calls | Simple HTTP requests (Over-the-Wire) |
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| **Runtime Control**| Logic split between backend and UI controller | Full control over UI and logic in backend |
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| **Model** | Defined at designtime via CDS | Designed at Designtime or Runtime via Internal Tables |
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### 2. State Management
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| Aspect | UI5 Freestyle | abap2UI5 |
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|----------------------------|-----------------------------------------------------|-----------------------------------------------------|
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| **State Definition** | Managed in frontend model (JSON/BindingContexts) | Centralized in ABAP ViewModels |
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| **Frontend Involvement** | Fully responsible for UI state | Frontend has no independent state management |
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| **Persistence** | Via backend APIs or model syncing | Reflected through ViewModel updates |
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| **User Interaction Flow** | Triggers JS controller events and backend calls | Triggers backend events, state is updated in ABAP |
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### 3. Developer Workflow
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### 2. Developer Workflow
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| Aspect | UI5 Freestyle | abap2UI5 |
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|----------------------------|-----------------------------------------------------|--------------------------------------------------------|
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| **Languages/Artifacts** | JS, XML, HTML, ABAP services | ABAP class for both View and logic |
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| **Languages/Artifacts** | JS, XML, HTML, OData services | ABAP class for both View and logic |
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| **Frontend Deployment** | UI5 app built and deployed to BSP/MTA | Shared static UI5 Shell (no app-specific deployment) |
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| **Tooling Requirements** | SAP Business Application Studio / Web IDE | Any ABAP IDE (including SE80), no additional tools |
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| **Transport** | Separate transport for frontend and backend | Single backend deployment via transport or abapGit |
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| **Development Style** | Imperative, frontend-driven | Declarative, ABAP-centric |
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| **Complexity** | High: frontend/backend split | Low: unified backend logic and layout |
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### 4. Client–Server Communication Flow
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### 3. Client–Server Communication Flow
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#### UI5 Freestyle
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```plaintext
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Browser (UI5 App)
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├──> Load HTML/CSS/JS resources
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├──> Initialize models and views
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├──> Bind data via OData/custom AJAX
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├──> Bind data via OData
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├──> Handle logic in JS controller
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Backend (OData/REST)
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└──> Responds to requests, no control over UI
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└──> Processes event, updates ViewModel, returns changes
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```
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### 5. Flexibility & Runtime Capabilities
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### 4. Flexibility & Runtime Capabilities
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| Aspect | UI5 Freestyle | abap2UI5 |
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|---------------------------|---------------------------------------------|------------------------------------------|
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| **Use Case Fit** | Highly interactive or frontend-heavy apps | Backend-driven UIs with clean backend control |
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| **Learning Curve** | Steep (JS, XML, binding, tooling) | Flat (ABAP-only, no JS or metadata) |
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### 6. Cloud Readiness & Compliance
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### 5. Cloud Readiness & Compliance
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| Feature | UI5 Freestyle | abap2UI5 |
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|----------------------------|-------------------------------|-------------------------------|
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| **Clean Core Compliance** | ✅ Possible | ✅ Yes |
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| **Runtime Flexibility** | ✅ via JS logic | ✅ Fully runtime-capable |
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> 🚀 **Both frameworks offer full UI flexibility.** abap2UI5 allows this using only ABAP, while UI5 Freestyle shifts control to the JavaScript layer.
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> 🚀 **Both approaches offer full UI flexibility.** abap2UI5 allows this using only ABAP, while UI5 Freestyle shifts control to the JavaScript layer.
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### Conclusion
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|--------------------------|-------------------------------|-----------------------------------|
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| UI Architecture | JavaScript MVC | Backend-driven Over-the-Wire |
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| Data & Actions | OData / custom AJAX | Simple HTTP |
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| State Handling | JSON Models in frontend | Central ABAP ViewModel |
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| UI Customization | Fully flexible via JS | Fully dynamic via ABAP |
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| Tooling | BAS / Web IDE | Any ABAP IDE |
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| Cloud Readiness | ✅ Yes | ✅ Yes |
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| Clean Core | ✅ Possible | ✅ Yes |
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| Clean Core | ✅ Yes | ✅ Yes |
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| Use Case Fit | Interactive web apps | Backend-driven UIs |
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| Learning Curve | High | Low |
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| Deployment | Split frontend/backend | Unified backend class |
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| Deployment | Split frontend/backend | Pure ABAP backend class |

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