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* Complete AL review knowledge readiness Fill telemetry and Query coverage, strengthen thin review domains, correct audited content defects, and add deterministic cheap-model evaluation and reference-integrity safeguards. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 9825b012-e653-496a-9310-c1f4b6f8ac27 * Generalize review fixture discovery Derive smoke cases from the leaf, domain, and paired-sample conventions so new leaves require no scoring-contract changes. Keep only exceptional selection/context overrides and fail when retrieval metadata cannot rank the selected article. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 9825b012-e653-496a-9310-c1f4b6f8ac27 * Preserve published field IDs in sample Keep the existing Email and Contact Email field IDs unchanged, clarify that the sample represents an independent baseline, and use a local breaking-change rule for the generic smoke evaluation. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 9825b012-e653-496a-9310-c1f4b6f8ac27 * Clarify published field identity rules State explicitly that a published field keeps its ID, name, and type while a replacement is added as a separate field under an unused ID. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 9825b012-e653-496a-9310-c1f4b6f8ac27 * Align field obsoletion sample baselines Use Email field ID 3 as the shared baseline so the bad example demonstrates a same-ID rename while the good example retains the original field and adds a separate replacement. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 9825b012-e653-496a-9310-c1f4b6f8ac27 --------- Co-authored-by: Jesper Schulz-Wedde <jesper.schulzwedde@microsoft.com>
26 lines
1.7 KiB
Markdown
26 lines
1.7 KiB
Markdown
---
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bc-version: [all]
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domain: performance
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keywords: [flowfield, visible, page-control, calculate-only-visible-flowfields, feature-management, hidden-field]
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technologies: [al]
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countries: [w1]
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application-area: [all]
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---
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# Hidden page FlowFields still calculate unless visible-only calculation is enabled
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## Description
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By default, a FlowField used directly as a page control's source is calculated when the page loads even when `Visible = false` or its visibility expression evaluates to false. The hidden control can therefore issue an aggregate query that no user sees. Business Central 26 introduced the **Calculate only visible FlowFields** feature-management option; only environments with that option enabled skip calculation for controls that are not visible.
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## Best Practice
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On BC 26 and later, enable and verify the visible-only FlowField feature before relying on `Visible` to suppress calculation. When the target environment does not guarantee that option, avoid binding an expensive FlowField directly to a usually-hidden control: calculate it only in the branch that displays it and bind the page control to a variable. Do not flag a hidden FlowField when the v26 feature is known to be enabled or the FlowField is cheap and intentionally preloaded.
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See sample: `hidden-flowfields-still-calculate-before-bc26-opt-in.good.al`.
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## Anti Pattern
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Adding a costly Sum or Lookup FlowField to a page with `Visible = SomeRareMode` and assuming the hidden state prevents its query on all supported versions. The review signal is the direct FlowField source plus conditional or false visibility, not visibility alone.
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See sample: `hidden-flowfields-still-calculate-before-bc26-opt-in.bad.al`.
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