TextArea

Description #

<vaadin-text-area> is a web component for multi-line text input.

<vaadin-text-area label="Comment"></vaadin-text-area>

Prefixes and suffixes #

These are child elements of a <vaadin-text-area> that are displayed inline with the input, before or after. In order for an element to be considered as a prefix, it must have the slot attribute set to prefix (and similarly for suffix).

<vaadin-text-area label="Description">
  <div slot="prefix">Details:</div>
  <div slot="suffix">The end!</div>
</vaadin-text-area>

Styling #

The following custom properties are available for styling:

Custom property	Description	Default
--vaadin-field-default-width	Default width of the field	12em

<vaadin-text-area> provides the same set of shadow DOM parts and state attributes as <vaadin-text-field>. See <vaadin-text-field> for the styling documentation.

See Styling Components documentation.

Properties #

accessibleName #

Type: string | null | undefined

String used to label the component to screen reader users.

accessibleNameRef #

Type: string | null | undefined

Id of the element used as label of the component to screen reader users.

allowedCharPattern #

Type: string

A pattern matched against individual characters the user inputs.

When set, the field will prevent:

• keydown events if the entered key doesn't match /^allowedCharPattern$/
• paste events if the pasted text doesn't match /^allowedCharPattern*$/
• drop events if the dropped text doesn't match /^allowedCharPattern*$/

For example, to allow entering only numbers and minus signs, use: allowedCharPattern = "[\\d-]"

autocapitalize #

Type: "characters" | "none" | "off" | "on" | "sentences" | "words"

This is a property supported by Safari and Chrome that is used to control whether autocapitalization should be enabled when the user is entering/editing the text. Possible values are: characters: Characters capitalization. words: Words capitalization. sentences: Sentences capitalization. none: No capitalization.

autocomplete #

Type: string | undefined

Whether the value of the control can be automatically completed by the browser. List of available options at: https://developer.mozilla.org/en/docs/Web/HTML/Element/input#attr-autocomplete

autocorrect #

Type: boolean

This is a property supported by Safari that is used to control whether autocorrection should be enabled when the user is entering/editing the text. Possible values are: on: Enable autocorrection. off: Disable autocorrection.

autofocus #

Type: boolean

Specify that this control should have input focus when the page loads.

autoselect #

Type: boolean

If true, the input text gets fully selected when the field is focused using click or touch / tap.

clearButtonVisible #

Type: boolean

Set to true to display the clear icon which clears the input.

It is up to the component to choose where to place the clear icon: in the Shadow DOM or in the light DOM. In any way, a reference to the clear icon element should be provided via the clearElement getter.

disabled #

Type: boolean

If true, the user cannot interact with this element.

errorMessage #

Type: string | null | undefined

Error to show when the field is invalid.

helperText #

Type: string | null | undefined

String used for the helper text.

invalid #

Type: boolean

Set to true when the field is invalid.

label #

Type: string | null | undefined

The label text for the input node. When no light dom defined via [slot=label], this value will be used.

manualValidation #

Type: boolean

Set to true to enable manual validation mode. This mode disables automatic constraint validation, allowing you to control the validation process yourself. You can still trigger constraint validation manually with the validate() method or use checkValidity() to assess the component's validity without affecting the invalid state. In manual validation mode, you can also manipulate the invalid property directly through your application logic without conflicts with the component's internal validation.

maxlength #

Type: number | null | undefined

Maximum number of characters (in Unicode code points) that the user can enter.

maxRows #

Type: number | null | undefined

Maximum number of rows to expand to before the text area starts scrolling. This effectively sets a max-height on the input-field part. By default, it is not set, and the text area grows with the content without constraints.

minlength #

Type: number | null | undefined

Minimum number of characters (in Unicode code points) that the user can enter.

minRows #

Type: number

Minimum number of rows to show. Default is two rows.

When using a custom slotted textarea, the minimum number of rows are not applied for backwards compatibility.

name #

Type: string

The name of this field.

pattern #

Type: string

A regular expression that the value is checked against. The pattern must match the entire value, not just some subset.

placeholder #

Type: string

A hint to the user of what can be entered in the field.

readonly #

Type: boolean

When present, it specifies that the field is read-only.

required #

Type: boolean

Specifies that the user must fill in a value.

title #

Type: string

The text usually displayed in a tooltip popup when the mouse is over the field.

value #

Type: string

The value of the field.

Methods #

checkValidity #

Type: (() => boolean) & (() => boolean)

Returns true if the current textarea value satisfies all constraints (if any).

clear #

Type: () => void

Clear the value of the field.

scrollToEnd #

Type: () => void

Scrolls the textarea to the end if it has a vertical scrollbar.

scrollToStart #

Type: () => void

Scrolls the textarea to the start if it has a vertical scrollbar.

validate #

Type: () => boolean

Validates the field and sets the invalid property based on the result.

The method fires a validated event with the result of the validation.

Events #

change #

Type: TextAreaChangeEvent

Fired when the user commits a value change.

input #

Type: CustomEvent

Fired when the value is changed by the user: on every typing keystroke, and the value is cleared using the clear button.

invalid-changed #

Type: TextAreaInvalidChangedEvent

Fired when the invalid property changes.

validated #

Type: TextAreaValidatedEvent

Fired whenever the field is validated.

value-changed #

Type: TextAreaValueChangedEvent

Fired when the value property changes.

Types #

TextAreaChangeEvent #

/**
 * Fired when the user commits a value change.
 */
export type TextAreaChangeEvent = Event & {
  target: TextArea;
};

TextAreaInvalidChangedEvent #

/**
 * Fired when the `invalid` property changes.
 */
export type TextAreaInvalidChangedEvent = CustomEvent<{ value: boolean }>;

TextAreaValidatedEvent #

/**
 * Fired whenever the field is validated.
 */
export type TextAreaValidatedEvent = CustomEvent<{ valid: boolean }>;

TextAreaValueChangedEvent #

/**
 * Fired when the `value` property changes.
 */
export type TextAreaValueChangedEvent = CustomEvent<{ value: string }>;