--- name: ui5-best-practices-smart-controls description: | UI5 smart controls (sap.ui.comp) best practices for OData V2 annotation-driven controls. Use when creating/troubleshooting SmartField, SmartForm, SmartFilterBar, SmartChart, SmartLink, SmartMultiInput, or SmartTable. Covers control selection, annotations (ValueList, FieldControl, SemanticObject, UI.LineItem, UI.Chart), mandatory rules, common errors, and per-control API reference. Triggers: "SmartField", "SmartForm", "SmartFilterBar", "SmartChart", "SmartLink", "SmartMultiInput", "sap.ui.comp", "smart control annotations", "OData V2 metadata-driven", "value help annotations", "ValueList annotation", "field control annotation", "semantic object navigation". Keywords: sap.ui.comp, SmartField, SmartForm, SmartFilterBar, SmartChart, SmartLink, SmartMultiInput, SmartTable, ValueHelpDialog, OData V2, annotations, ValueList, FieldControl, SemanticObject, entitySet, ControlConfiguration, GroupConfiguration, textArrangement, FilterProvider, initialise, beforeRebindChart, navigationTargetsObtained --- # UI5 Smart Controls Best Practices Apply these guidelines whenever generating, reviewing, or troubleshooting UI5 smart control code in freestyle applications using OData V2 services. **UI5 version baseline:** SAPUI5 1.136+ LTS. All features mentioned are available from this version unless noted. ## When to load each reference | Trigger | Load | | ---------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------- | | Working on or planning a `sap.ui.comp.smartfield.SmartField` | [`references/smart-field.md`](references/smart-field.md) | | Working on or planning a `sap.ui.comp.smartform.SmartForm` | [`references/smart-form.md`](references/smart-form.md) | | Working on or planning a `sap.ui.comp.smartfilterbar.SmartFilterBar` | [`references/smart-filter-bar.md`](references/smart-filter-bar.md) | | Working on or planning a `sap.ui.comp.smartchart.SmartChart` | [`references/smart-chart.md`](references/smart-chart.md) | | Working on or planning a `sap.ui.comp.navpopover.SmartLink` | [`references/smart-link.md`](references/smart-link.md) | | Working on or planning a `sap.ui.comp.smartmultiinput.SmartMultiInput` | [`references/smart-multi-input.md`](references/smart-multi-input.md) | | Working on or planning a `sap.ui.comp.filterbar.FilterBar` | [`references/filter-bar.md`](references/filter-bar.md) | | Working on or planning a `sap.ui.comp.valuehelpdialog.ValueHelpDialog` | [`references/value-help-dialog.md`](references/value-help-dialog.md) | Load before producing any output. Do not work from memory. --- ## Core Rules ### Mandatory - Always specify `entitySet` on Smart controls or ensure the control inherits a binding context that resolves the entity type. - Use `ControlConfiguration` in XML for SmartFilterBar field overrides (control type, filter type, index). Only `visible`, `label`, and `visibleInAdvancedArea` can be changed at runtime. - Use the correct hierarchy: `SmartForm > Group > GroupElement > SmartField`. Never place SmartFields directly in a SmartForm. - Wait for the `initialise` event before programmatically accessing inner controls (e.g., `getInnerControl()`, `getChart()`). - Use `sap.ui.model.odata.type.*` types in bindings alongside OData V2 models. Never use `sap.ui.model.type.*` with OData V2. - Set `ariaLabelledBy` on SmartFilterBar and SmartChart referencing a visible title for accessibility. - Use `check()` on SmartForm for client-side mandatory field validation before submitting data. - Use `get_api_reference` MCP tool to verify control APIs. Use `run_ui5_linter` to validate code. ### Prohibitions - Do not use Smart controls with OData V4 services. Use MDC controls (`sap.ui.mdc`) instead. - Do not set custom formatters on SmartField `value` property. SmartField manages its own rendering based on metadata. Use annotations to influence behavior. - Do not use composite binding syntax (`parts: [...]`) on SmartField. It manages its own composite bindings for unit/currency fields. - Do not call `getChart()` synchronously during initialization. Use the `initialise` event or `getChartAsync()`. - Do not directly modify inner controls of SmartChart or SmartTable (e.g., the inner `sap.chart.Chart`). Use the smart control's public API. - Do not hardcode field labels. Use `sap:label` or `@Common.Label` annotations in OData metadata. - Do not use inline styles or scripts in HTML (CSP compliance). - Do not use global access (`sap.ui.comp.smartfield.SmartField`). Use `sap.ui.define` or ES6 imports. --- ## Selection Matrix | Control | Use when | Do not use when | | ----------------- | ---------------------------------------------------------------------------------- | --------------------------------------------------------------------------------- | | `SmartField` | OData V2, single property display/edit, auto-rendering by Edm type and annotations | OData V4, JSON models, custom rendering required, composite/multi-property fields | | `SmartForm` | OData V2, entity editing with multiple SmartFields, auto-labels from annotations | OData V4, complex custom layouts, non-OData data | | `SmartFilterBar` | OData V2, annotation-driven filter UI, integration with SmartTable/SmartChart | OData V4 (use MDC FilterBar), JSON-only, purely custom filter logic | | `SmartChart` | OData V2, annotation-driven chart visualization, drill-down, variant management | OData V4 (use MDC Chart), non-analytical data, custom chart JS | | `SmartLink` | OData V2, semantic object navigation, cross-app navigation via FLP | OData V4 (use MDC Link), simple static links, no FLP available | | `SmartMultiInput` | OData V2, multi-value entry with tokens, value help with ranges | OData V4, simple single-value input, JSON-only | | `FilterBar` | Manual filter UI without OData annotations, inside ValueHelpDialog, custom filters | OData V2 with annotations (use SmartFilterBar), OData V4 (use MDC FilterBar) | | `ValueHelpDialog` | Complex value selection with table + conditions tabs, token-based multi-select | Simple dropdowns, single-value selection, OData V4 (use MDC ValueHelp) | --- ## Common Errors | Symptom | Cause | Fix | | ---------------------------------------------- | ----------------------------------------------------------- | ------------------------------------------------------------------- | | SmartField renders as plain text in edit mode | Missing binding context or wrong `entitySet` | Verify `value="{PropertyName}"` and entity context resolution. | | SmartField shows Input instead of DatePicker | Missing `sap:display-format="Date"` on property | Add annotation or use `controlType` in ControlConfiguration. | | SmartForm labels missing | `sap:label` annotation not set in OData metadata | Add `sap:label` to property or set `label` on GroupElement. | | SmartFilterBar type-ahead not working | Missing `ValueList` annotation with correct target path | Verify target: `{Namespace}.{EntityName}/{FieldName}`. | | SmartFilterBar default values ignored | Setting ControlConfiguration dynamically after `initialise` | Set values statically in XML or use `setFilterData()` API. | | SmartChart height is 0 / not visible | Container does not provide explicit height | Set height on parent container (e.g., `height="50vh"`). | | SmartChart missing dimensions/measures | Wrong or missing `UI.Chart` annotation | Verify `MeasureAttributes` and `DimensionAttributes` in annotation. | | SmartLink popover shows "No content available" | No navigation targets for semantic object in FLP | Verify FLP configuration and user authorizations. | | SmartLink rendered as text (not clickable) | No `SemanticObject` annotation on property | Add `@Common.SemanticObject` annotation to OData property. | | SmartMultiInput tokens not persisting | Missing ValueList or incorrect binding | Verify ValueList annotation and navigation property binding. | --- ## Performance & Accessibility ### Anti-patterns to avoid - Requesting all value lists eagerly (use lazy loading; value lists load on-demand by default). - Using `liveMode="true"` on SmartFilterBar with expensive backend queries (causes rapid re-fetching). - Deep nesting of SmartForm groups (keep hierarchy flat: Form > Group > GroupElement). - Bypassing SmartChart API to modify inner chart directly (breaks personalization and variant management). - Not setting `ignoredChartTypes` when certain chart types are irrelevant (unnecessary UI options). ### Accessibility checklist - Set `ariaLabelledBy` on SmartFilterBar referencing a visible title. - Set `ariaLabelledBy` on SmartChart referencing a visible title. - SmartForm automatically propagates labels to SmartFields via annotations. - Verify keyboard navigation works for SmartFilterBar "Adapt Filters" dialog. - Test SmartLink popover with screen reader (navigation targets must be announced).