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Lead with a complete plugin quick start and add task-oriented usage, troubleshooting, customization, and contribution guides. Preserve the broader plugin framing, correct conflicting contract guidance, support Agents folder reviews, and align repository validation. Convert existing sample references to clickable links without changing knowledge rules. Co-authored-by: Jesper Schulz-Wedde <jesper.schulzwedde@microsoft.com> Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
26 lines
1.4 KiB
Markdown
26 lines
1.4 KiB
Markdown
---
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bc-version: [all]
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domain: performance
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keywords: [report, addloadfields, onpredataitem, dataitem, partial-record, layout]
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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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# Add trigger-only report fields in OnPreDataItem
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## Description
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Report dataitem field selection is calculated at compile time and once per dataitem type during execution. Fields referenced by dataset columns are selected automatically; fields used only in triggers are not. Use `AddLoadFields` in `OnPreDataItem` to supplement the automatic selection with normal fields that trigger code needs.
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## Best Practice
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When a dataitem trigger needs an extra field, add that field in `OnPreDataItem` before iteration starts. This supplements the compiler-selected fields and avoids the first just-in-time load and enumerator update when the trigger reads the extra field.
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See sample: [`addloadfields-in-report-onpredataitem.good.al`](addloadfields-in-report-onpredataitem.good.al).
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## Anti Pattern
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Listing every dataset column in `AddLoadFields`, or omitting a known trigger-only field because the dataset already uses other fields. The former is redundant; the latter causes a just-in-time load on first access and can cause repeated loads when the record is copied or passed by value.
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See sample: [`addloadfields-in-report-onpredataitem.bad.al`](addloadfields-in-report-onpredataitem.bad.al).
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