# Matrix question A React block (a whole screen) in [Beamline](https://beamline.io/)'s [Research & design](https://beamline.io/components/apps/research-design) app. Live demo: https://beamline.io/components/matrix-question A matrix question and the participant's side of it, side by side. Rows (up to ten) share one set of choices (two to seven); Enter adds a row, several pasted lines add several choices and lines that don't fit are counted; one or several answers per row, rows and choices shuffled apart (each participant keeps their own order), an opt-out with its own label, every row required or not, and a phone layout of a grid or one row at a time. Empty rows, too few choices and duplicate labels are said; published locks the structure while labels still edit. The preview answers it as a participant on a desktop grid or a phone: opt-out clears the row's other answers, answers are kept when the layout changes, progress fills as rows are answered and Continue waits for required rows. ## Use it for - Writing a grid question where several statements share one scale, and seeing the participant's side as you write. - Any survey builder that needs rows against shared choices on desktop and phone. ## Not for - A single rating ([rating](https://beamline.io/components/rating)). - Reading answers back ([data-grid](https://beamline.io/components/data-grid), [bar-chart](https://beamline.io/components/bar-chart)). ## Anatomy - header: the product's mark and title; a lock note when published - editor: the question, rows with their count, choices with their count and an add field, answers per row, phone layout, shuffling, required, opt-out and its label; problems - preview: desktop or phone; the question, a progress bar per row, a grid with a column per choice (opt-out set apart) or one row at a time with Back and Next; Continue ## States - rows: empty row said; ten at most (add off) - choices: fewer than two said; seven at most (add off), pasted overflow counted (amber) - duplicate labels said - shuffled: said - published: structure locked (blue note), labels open - participant: unanswered, partial (progress), answered (Continue on), opt-out exclusive, several answers, recorded (green) - phone: a grid that scrolls sideways or one row at a time - right to left: the page mirrors ## Keyboard - Enter in a row adds the next row; Enter in the add field adds a choice; Tab through fields and grid cells; Space picks a cell; arrows move between a row's radio cells ## Motion Nothing moves; changes appear on input. ## Props | Prop | Type | Default | Description | | --- | --- | --- | --- | | `defaultValue` (required) | `MatrixDefinition` | — | Initial selection when uncontrolled; omitted by default. | | `defaultAnswers` | `Record` | — | Answers already given in the preview, by row id. | | `defaultPreview` | `"desktop" \| "mobile"` | — | | | `published` | `boolean` | — | The study is published: structure is locked, labels aren't. | | `seed` | `number` | — | Seeds the participant's shuffled order. | | `onChange` | `((value: MatrixDefinition) => void)` | — | | | `product` | `string` | — | Your product's name, shown as its mark. | | `className` | `string` | — | Classes on the documented visual root; no override by default. | | `ref` | `Ref` | — | Receives the documented native target or imperative handle; omitted by default. | ## Built from - [Avatar](https://beamline.io/components/avatar.md) - [Button](https://beamline.io/components/button.md) - [Checkbox](https://beamline.io/components/checkbox.md) - [Input](https://beamline.io/components/input.md) - [Label](https://beamline.io/components/label.md) - [Radio group](https://beamline.io/components/radio-group.md) - [Segmented control](https://beamline.io/components/segmented-control.md) - [Select](https://beamline.io/components/select.md) - [Spinner](https://beamline.io/components/spinner.md) - [Switch](https://beamline.io/components/switch.md) - [Text morph](https://beamline.io/components/text-morph.md) - [Tooltip](https://beamline.io/components/tooltip.md) ## Import ```tsx import { MatrixQuestion } from "@beamline/matrix-question"; ``` ## Get it Matrix question 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 Research & design - [Research synthesis](https://beamline.io/components/research-synthesis): A research study turned into evidence in one place. Transcripts: passages marked as accepted highlights or as the assistant's suggestions (dashed)… - [Study setup](https://beamline.io/components/study-setup): Set up an unmoderated test and its screener. Test: what's tested (a website, a prototype by its share link, an app by its store page), who takes it… - [Study flow](https://beamline.io/components/study-flow): A study's blocks in order, each with where people go next. A block that routes by its answer (multiple choice, scale, open question, prototype task) has… - [Participant review](https://beamline.io/components/participant-review): One participant's session, answer by answer, beside the list of everyone who took the study. The list filters (finished, left early, with a recording)… - [Click heatmap](https://beamline.io/components/click-heatmap): One screen of a usability task as it looked (your prototype's frame or a page built from your parts, scaled into a phone) with where people clicked over… - [Tree test](https://beamline.io/components/tree-test): A tree test: build a navigation tree and read where people went. Build: pages added at the top or under any page, indented under the page above or moved… - [Prototype task](https://beamline.io/components/prototype-task): A prototype task in a study. The linked prototype refreshes from the design keeping the task and paths (a start screen gone from the new version said, a… - [Task results](https://beamline.io/components/task-results): A usability task's results, from headline outcomes down to paths and screens. Outcomes (direct success, indirect success, gave up) say their share and… - [Prototype review](https://beamline.io/components/prototype-review): Reviewing a design file's clickable prototype. Present: the board on a stage with its wireframe, the flow chosen (an unavailable one can't be), Back… - [Report builder](https://beamline.io/components/report-builder): Build a chart from your metrics without code: choose metrics, how to group them over time, an optional breakdown, filters, the range and the chart, see… - [Report library](https://beamline.io/components/report-library): A business's reports in one place. The directory: reports by topic and group with search, each with what it answers; one this person can't open says why… - [Review page builder](https://beamline.io/components/review-page-builder): Building the page reviewers use to go through records one by one. The queue of records (one with no title shows its id instead of a blank); the record as… - [Database builder](https://beamline.io/components/database-builder): What a database does for the people who use it, built in one place. Templates: starting values per property (a relation default points at an existing… - [Workflow builder](https://beamline.io/components/workflow-builder): Automation rules for a SaaS without code: a trigger, conditions built with the query builder that branch into Yes and No, actions and waits, drawn as a… - [Workflow library](https://beamline.io/components/workflow-library): The automation library: every automation as a row (what starts it, whether it's live, a draft or paused, who owns it, when it last ran, and its runs this… - [Drawing board](https://beamline.io/components/drawing-board): A whiteboard a team already knows how to use, like FigJam: tools in a floating bar at the bottom (Select V, Hand H, Sticky note S, Shape R/O/D, Connector… - [Model workbench](https://beamline.io/components/model-workbench): A CAD model's workbench around a large isometric scene of its bodies, each shaded from its material's appearance with a soft ground shadow and an axis… - [Component properties](https://beamline.io/components/component-properties): A design system component from three sides. Its variants as a matrix on two chosen properties, the others filtering it, each cell drawing the variant; a… - [Slot editor](https://beamline.io/components/slot-editor): Slots in a design system component, from making to filling. The main component's layer tree with a checkbox per layer: a nested frame converts to a slot… 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).