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#

Bind a 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. You can move the cursor, edit text, and drive selections from your own key bindings or commands. All selection-aware movement methods accept { select: true } to extend the current selection instead of moving the cursor.

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 }) // Emacs-style smart home
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 as needed. Selection behavior depends on the method. Movement with { select: true } extends the selection. Call clearSelection() when a command must clear the global 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 a different EditorTraits object emits the traits-changed event.

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.