Imagine Power BI reports that don't just present data but act like truly dynamic, interactive data applications. Imagine intuitive custom slicers that work in one click, UI elements that react intelligently to user context beyond simple cross-filtering, and developers spending less time on brittle workarounds and more time delivering sophisticated, tailored user experiences. I believe Power BI has the potential to evolve further in this direction by bridging the gap between its powerful data engine and its user interface layer. The Problem: The Compromise Chasm & Workaround Hell As Power BI developers, we often hit a ceiling when trying to fully realize specific user requirements for interactivity and custom UI behavior. This leads to compromises: Core Visual Limitations: While the core visuals are great for standard scenarios, they frequently lack the specific interaction patterns (like advanced slicing, dynamic navigation) or deep customization needed for tailored solutions. DAX is "UI-Blind": DAX is phenomenal for data modeling and calculation based on the results of filtering (SELECTEDVALUE, ISFILTERED). However, it fundamentally lacks awareness of the UI state itself. It cannot natively know: Which specific slicer triggered a filter if multiple exist for the same field. The current state of a toggle button or custom UI element. Which specific bookmark is active (only its filtering effect). Properties of visual containers (like IDs, names, current visibility state unless tied to data). The Bookmark/Parameter Burden: To overcome these limitations, we resort to complex workarounds: Intricate webs of bookmarks showing/hiding elements to simulate states (often making bookmarks a developer tool instead of a user feature). Disconnected parameter tables and "controller" measures just to pass simple state information into DAX. Impact: This drastically increases development time, clutters the data model and bookmark pane, makes reports opaque and incredibly difficult to maintain or hand over (often necessitating a rebuild), and degrades the efficiency of iterative development. Development Pace: While the Fabric ecosystem and AI features are rapidly evolving, the development pace for fundamentally enhancing core visual interactivity options and providing developers with deeper programmatic control over the UI layer feels slower, leaving these gaps unaddressed year after year. The Proposed Solution: Native UI Scripting & DAX/UI Communication I propose enhancing Power BI Desktop and Service with first-class support for native UI-aware scripting, potentially using TypeScript, coupled with robust communication channels between this scripting layer and the DAX engine/data model. This could involve: Object Model Access: Allowing script (e.g., TypeScript) running within Power BI to reliably access a Report Object Model, getting unique IDs, names, current states (selected value, toggle state, visibility), and properties of visuals, slicers, buttons, pages, and bookmarks. DAX State Awareness: New DAX functions or mechanisms to read state variables or context set by the scripting layer (e.g., GET_VISUAL_STATE("MyCustomSlicerID", "SelectedCount"), IS_BOOKMARK_ACTIVE("MySpecificBookmark")). (Advanced) Bi-directional Communication: Potentially allowing script to trigger specific measure evaluations or DAX to influence non-data-bound UI properties (though this requires careful architectural consideration). Benefits & Results: True Data Application Potential: Power BI could become a genuine low-code and pro-code environment for building data-centric applications, not just reports. Highly Custom Interactivity: Developers could build precisely the slicers, navigators, buttons, and interactive logic users need (like one-click applicant switchers, dynamic pagination, context-aware controls) without compromises. Reduced Workaround Complexity: Dramatically reduce reliance on brittle bookmark/parameter hacks, leading to cleaner models, faster development, and vastly improved maintainability. Developer Empowerment: Give developers the tools to solve complex UI/UX challenges directly within the platform. Fewer Compromises: Deliver solutions that exactly match user requirements more often. Addressing Concerns: This doesn't need to sacrifice Power BI's ease of use for simpler scenarios. The core drag-and-drop, filter-based interaction should remain. This proposed capability would be an additional, optional layer for developers needing advanced control, perhaps enabled via a "pro-developer" mode or specific visual types (requiring user opt-in and clear warnings about complexity/potential issues). Call to Action: Is this vision of a more programmable UI layer within Power BI shared by others in the community? Would having deeper, more direct interaction between the UI state and the data/DAX logic unlock significant value for your projects? I believe this is a crucial area for future Power BI evolution and would love to hear thoughts from the community and Microsoft.
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