Textarea

Textarea edits multiple lines with cursor movement, selection, and configurable key bindings. Use Input for a single line.

Availability

Basic usage

Renderable API

import { TextareaRenderable, createCliRenderer } from "@opentui/core"

const renderer = await createCliRenderer()

const textarea = new TextareaRenderable(renderer, {
  id: "notes",
  width: 50,
  height: 6,
  placeholder: "Type notes here...",
  backgroundColor: "#1a1a1a",
  focusedBackgroundColor: "#222222",
  textColor: "#FFFFFF",
  cursorColor: "#00FF88",
})

renderer.root.add(textarea)
textarea.focus()

At 30 columns, longer text wraps at word boundaries:

textarea.width = 30
textarea.setText("Long lines wrap at word boundaries.\nKeep paragraphs readable.")

Notes
Long lines wrap at word
boundaries.
Keep paragraphs readable.

Submit handling

By default, Meta+Return and Meta+keypad Enter submit. To use another key, bind the submit action and listen for onSubmit:

import { TextareaRenderable } from "@opentui/core"

const textarea = new TextareaRenderable(renderer, {
  width: 50,
  height: 6,
  onSubmit: () => {
    console.log("Submitted:", textarea.plainText)
  },
  keyBindings: [{ name: "return", ctrl: true, action: "submit" }],
})

Placeholder styling

const textarea = new TextareaRenderable(renderer, {
  width: 40,
  height: 4,
  placeholder: "Type here",
  placeholderColor: "#666666",
})

Properties

If you omit a focused color, the constructor copies the corresponding base color. If you omit both values, the focused background is transparent, and the focused text uses #FFFFFF.

Useful properties

cursorCharacterOffset uses a display-cell offset as a JavaScript string index. Its result is not reliable after wide graphemes, line breaks, or joined emoji. Use logicalCursor, visualCursor, and the editing-buffer APIs for Unicode-aware work.

Cursor and selection control

TextareaRenderable and its base EditBufferRenderable expose a programmatic API. Use it to move the cursor, edit text, and control selections from your own key bindings or commands. Methods that accept { select: true } move the cursor and extend the selection to the new cursor position. Without that option, they clear the selection. If a selection exists, each of these methods except moveCursorUp() and moveCursorDown() then only moves the cursor to the selection start or end.

Cursor movement

textarea.setCursor(row, col)
textarea.moveCursorLeft()
textarea.moveCursorRight({ select: true })
textarea.moveCursorUp()
textarea.moveCursorDown()

textarea.moveWordForward({ select: true })
textarea.moveWordBackward()

textarea.gotoLine(0)
textarea.gotoLineStart()
textarea.gotoLineTextEnd()
textarea.gotoLineHome({ select: true }) // At column 0, moves to the end of the previous line
textarea.gotoLineEnd()
textarea.gotoVisualLineHome()
textarea.gotoVisualLineEnd()
textarea.gotoBufferHome()
textarea.gotoBufferEnd({ select: true })

Selection

Textarea uses the repeated-click behavior from Text selection. After a double-click or triple-click, the cursor stays on the clicked grapheme. A later Shift+Arrow keeps the selected text and continues the selection by cells, not by words or lines.

textarea.setSelection(start, end) // half-open [start, end) in both occupancy modes
textarea.setSelectionInclusive(start, end) // also selects the grapheme at end in cell mode
textarea.selectAll()
textarea.clearSelection()
textarea.deleteSelection()

Selecting keyboard focus in a draft:

Draft
Plan the release
Review keyboard focus
Ship the update

Editing

textarea.insertChar("a")
textarea.insertText("\ninserted")
textarea.deleteChar() // forward delete
textarea.deleteCharBackward() // backspace
textarea.deleteWordForward()
textarea.deleteWordBackward()
textarea.deleteToLineEnd()
textarea.deleteToLineStart()
textarea.deleteLine()
textarea.newLine()
textarea.undo()
textarea.redo()

These methods update the editor and request a render. If a selection exists, insertChar() and insertText() replace the selected text. deleteChar(), deleteCharBackward(), deleteWordForward(), and deleteWordBackward() delete it. Call clearSelection() when a command must clear the renderer's selection.

The default occupancy is cell: the selection covers both endpoint cells, so the first shift+right selects two cells. If you use a bar cursor (cursorStyle: { style: "line" }), also set selectionOccupancy: "boundary". The cursor style is visual only and never changes which text you select, copy, or delete.

Traits

The traits property tells a host UI which built-in keys the editor wants to capture. It also supplies a visual-suspension hint and an optional status label. Assigning traits with a different capture, suspend, or status value emits the traits-changed event. The listener receives the new and previous traits. A new object with the same values emits nothing.

import { EditBufferRenderableEvents, type EditorTraits } from "@opentui/core"

textarea.traits = {
  capture: ["escape", "submit"], // consume these before host binds
  suspend: false,
  status: "Composing reply",
} satisfies EditorTraits

textarea.on(EditBufferRenderableEvents.TRAITS_CHANGED, (traits) => {
  updateFooter(traits.status ?? "")
})

Traits reset to an empty object when you destroy the renderable. Use isEditBufferRenderable(renderable) if you need to distinguish editor renderables from plain text renderables in a generic tree.

Related concepts

Read Interaction, focus, and selection for focus and selection ownership. Read Text and terminal cells for the difference between buffer offsets, graphemes, and display cells.