# Import lens A React component in [Beamline](https://beamline.io/)'s [Data & tables](https://beamline.io/components/data) category. Live demo: https://beamline.io/components/import-lens A messy import made fixable by kind: rows stream through the checks once with live counts; problems gather into groups that say what is wrong in words with the rows they hold, biggest first; a group's fix (previewed on three of its values) clears all its rows at once, an ambiguous date is chosen once and never guessed, and a cell fixed by hand offers the same fix for every similar row with the count it clears. Every fix is listed with Undo; only the rows to fix are shown by default; nothing is imported until the host's Import. ## Use it for - A customer's first import (contacts, members, products, patients) after the columns are mapped: the rows that fail checks, grouped by what is wrong, fixed a kind at a time. - The host owns the fields' checks and fixes and the import; the part runs the checks, groups, previews and undoes. ## Not for - Mapping columns to fields → [import-mapping](https://beamline.io/components/import-mapping). - Editing records that are already in the app → [data-grid](https://beamline.io/components/data-grid) or [living-table](https://beamline.io/components/living-table). ## Anatomy - header: the file's label; the counts (N rows · N ready · N to fix, or Every row is ready); a bar of ready, to fix and not yet checked - groups: one per field and kind of problem, biggest first: the field, what is wrong in words, how many rows; its fixes as buttons, each with three of its values previewed (12/03/2025 → 2025-03-12), or No fix to offer - history: each applied fix with its count and Undo - rows: Only rows to fix / All rows; a table whose cells are fields, a problem cell marked and named; Same fix for N more rows under a cell fixed by hand; Show N more - Import N ready rows ## States - checking (the stream) - rows to fix - every row ready - a fix applied (undoable) - an offer after a hand fix - importing - imported - no fix to offer ## Keyboard - Every fix, Undo, the show switch and Show more are buttons; each cell is a field named by its row and field (and its problem); Enter or leaving the field applies it, Escape puts the value back - What a fix did is said once (a polite status): N fixed, N to fix ## Motion The rows stream through the checks once on arrival (the bar fills, the counts climb), then nothing runs. The to-fix count rolls on each fix. Reduced motion skips the stream. ## Props | Prop | Type | Default | Description | | --- | --- | --- | --- | | `label` (required) | `string` | — | "contacts.csv · 1,284 rows". | | `fields` (required) | `ImportField[]` | — | | | `value` | `ImportRow[]` | — | Controlled rows (as edited); omit to use defaultValue. | | `defaultValue` (required) | `ImportRow[]` | — | Initial selection when uncontrolled; omitted by default. | | `onValueChange` | `((rows: ImportRow[]) => void)` | — | Reports the selected value after a change; no callback by default. | | `onImport` | `((rows: ImportRow[]) => void \| Promise)` | — | Import the rows that pass every check. | | `page` | `number` | — | Rows the grid shows at a time. Default 12. | | `className` | `string` | — | Classes on the documented visual root; no override by default. | | `classNames` | `Partial>` | — | Classes for the named visual parts; no overrides by default. | | `style` | `CSSProperties` | — | Inline styles on the documented visual root; no overrides by default. | | `ref` | `Ref` | — | Receives the documented native target or imperative handle; omitted by default. | | `defaultPreview` | `string` | — | A fix shown in the rows at rest, before anyone points at it (its id, as in the field's check): the cells it would change show their new values and the counts say what is left after it. Nothing is applied until it is pressed. | ## Built from - [Button](https://beamline.io/components/button.md) - [Label](https://beamline.io/components/label.md) - [Segmented control](https://beamline.io/components/segmented-control.md) - [Select](https://beamline.io/components/select.md) - [Slot text](https://beamline.io/components/slot-text.md) - [Spinner](https://beamline.io/components/spinner.md) - [Text morph](https://beamline.io/components/text-morph.md) - [Tooltip](https://beamline.io/components/tooltip.md) ## Import ```tsx import { ImportLens } from "@beamline/import-lens"; ``` ## Get it Import lens is part of Beamline UI. Install the parts you need in your React app as compiled packages or editable source. [Get Beamline](https://beamline.io/checkout?pack=complete) · [Connect your agent](https://beamline.io/connect) ## More in Data & tables - [Living table](https://beamline.io/components/living-table): A table that shows as much as fits on both axes: width decides which columns show (the rest ride in the name line, moving there rather than vanishing)… - [Availability layers](https://beamline.io/components/availability-layers): A week of bookable start times whose closed times explain themselves: every availability rule (hours, time off, bookings, buffers, rooms, lead time… - [Capacity terrain](https://beamline.io/components/capacity-terrain): A schedule that stands on a terrain of capacity: under each station's lane of jobs, every day's load rises to its capacity line and an overload is a… - [Domino move](https://beamline.io/components/domino-move): A room board where one move shows its chain: drag a booking (or pick it and aim it with the keys) onto a taken room and the bookings it would push appear… - [Match board](https://beamline.io/components/match-board): Month-end matching as one picture: bank lines and books entries side by side with threads between them — solid for matched, dashed with the host's reason… - [Split anything](https://beamline.io/components/split-anything): One splitter for money, quantities and time: a bar of the whole shows every target's part and what is not split yet; items are dragged onto targets… - [Approval route](https://beamline.io/components/approval-route): A policy you can read by trying it: an amount on a log scale with the thresholds as marks (the arrows stop just under, at and just over each), the… - [Proposal twin](https://beamline.io/components/proposal-twin): A proposal edited beside the client's exact page, the two linked both ways: a field in focus lights its twin on the page, scrolls it into view and joins… - [Quantity river](https://beamline.io/components/quantity-river): The life of one order line's quantity: at rest a bar of its real split ("5 delivered · 1 back in stock · 1 damaged · 5 cancelled"), unfolding into a… - [Stock horizon](https://beamline.io/components/stock-horizon): Projected stock per item over the coming weeks: a strip of weeks with the safety line, weeks under safety in warn and short in danger, every dip said in… - [Ageing queue](https://beamline.io/components/ageing-queue): Tickets that visibly age: each ticket's ring fills toward its own service target and steps from on time to late to very late, the words say when it is… - [Duplicate guard](https://beamline.io/components/duplicate-guard): A new record that watches for the one that already exists: as you type, the likely duplicates slide in beside the form with the fields that match lit and… - [Scan flow](https://beamline.io/components/scan-flow): A pick list that takes scans: each scan flies from the scan field into its row and fills that row's quantity ring, and the prompt moves to the next bin… - [Pack planner](https://beamline.io/components/pack-planner): The packing bench: the order's items sit in box outlines drawn to scale, each box filling to its padding line, weighing against its limit and naming the… - [Provenance lens](https://beamline.io/components/provenance-lens): Hold Alt (or press Lens) over any number on the page and see what makes it: hairline threads draw from the number to the rows, cards and documents on… - [Record time machine](https://beamline.io/components/record-time-machine): The record itself, rewound in place: a slim track of every change (a tick per change in its person's colour, hollow for automation, named moments as… - [Tension timeline](https://beamline.io/components/tension-timeline): A plan where slack is something you see: every dependency is a string from one task's end to the next one's start, sagging with the days it has to spare… - [Replay bar](https://beamline.io/components/replay-bar): Rewind for anything live: pause a stream, scrub back to the moment you missed (markers for the ones that matter), step one update at a time, replay at a… - [Event calendar](https://beamline.io/components/event-calendar): A schedule of events by day, week or month: events that overlap sit side by side, drag one to another time or day or pull its bottom edge to change its… - [Kanban board](https://beamline.io/components/kanban-board): Work as cards in columns by stage: drag a card (or lift it with Space and walk it with the arrows) to another column or place, the cards around it make… - [Data grid](https://beamline.io/components/data-grid): Virtualised local or server-driven grid: stable row IDs, manual sort and filters, pages or infinite loading, retry without losing rows, inline editing… - [Pivot table](https://beamline.io/components/pivot-table): Records summed up by the fields people choose: rows grouped by one or more fields that fold open level by level, columns split by another, one or more… - [Query builder](https://beamline.io/components/query-builder): Conditions people build by hand to pick out records: each rule is a field, an operator that fits the field (contains, between, in the last N days, is any… - [Sort order](https://beamline.io/components/sort-order): Several sort keys in order. Each key says its rank in words ("Sort by Plan, A to Z", "then by Size, largest first") with its order named for the field's… - [Metric rules](https://beamline.io/components/metric-rules): Ordered rules that colour a dashboard number. Each rule has a name for what its colour means ("At risk", not just red) and a tone (good, watch, act… - [Log viewer](https://beamline.io/components/log-viewer): Log lines as they stream: it follows the newest line until you scroll up, then counts what arrived and brings you back in one click; filter by level with… - [JSON viewer](https://beamline.io/components/json-viewer): A JSON value as a tree you can read and walk: branches open and close (one level, or all at once), closed ones preview what they hold, every value reads… - [JSON diff viewer](https://beamline.io/components/json-diff-viewer): Two versions of a JSON value compared as one tree: added keys marked +, removed ones struck through with −, changed values read old → new, unchanged keys… - [Import mapping](https://beamline.io/components/import-mapping): Map the columns of a file to the fields of one record type, see what every value becomes, then run the import and get an outcome for each row… - [Diff table](https://beamline.io/components/diff-table): Proposed edits to a table before they happen: new rows green, removals struck through, changed cells old → new; each change can be left out and Apply… - [Filter toolbar](https://beamline.io/components/filter-toolbar): The filters on a list kept in view: chips that remove themselves, Add filter with fields and their values, Clear all, and room for search or view controls. - [Table](https://beamline.io/components/table): A native HTML table for small datasets, composed with children or driven by records; shared server paging, sorting, filters, search, stable-ID selection… Part of [Beamline UI: polished, editable React components and complete screens for custom applications](https://beamline.io/). [Build your own style from any look; tokens, fonts, radii, motion; not only colours](https://beamline.io/docs/customize).