harmony 鸿蒙textarea

2022-08-09
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textarea

NOTE

This component is supported since API version 4. Updates will be marked with a superscript to indicate their earliest API version.

The <textarea> component provides a text box to receive multi-line text input.

Required Permissions

None

Child Components

Not supported

Attributes

In addition to the universal attributes, the following attributes are supported.

Name	Type	Default Value	Mandatory	Description
placeholder	string	-	No	Content of the hint text.
maxlength	number	-	No	Maximum number of characters that can be entered in the multi-line text box.
headericon	string	-	No	Icon displayed before text input. This icon does not support click events. The supported icon formats are JPG, PNG, and SVG.
extend	boolean	false	No	Whether a text box can be extended. If the value of this attribute is set to true, the height of the text box can adapt to the text.
value⁵⁺	string	-	No	Content in a multi-line text box.
showcounter⁵⁺	boolean	false	No	Whether to display the character counter for the text box. This attribute takes effect only when maxlength is set.
menuoptions⁵⁺	Array<MenuOption>	-	No	Menu options displayed after users click the More button.
autofocus⁶⁺	boolean	false	No	Whether to automatically obtain focus.
selectedstart⁶⁺	number	-1	No	Start position for text selection.
selectedend⁶⁺	number	-1	No	End position for text selection.
softkeyboardenabled⁶⁺	boolean	true	No	Whether to display the soft keyboard during editing.

Table 1 MenuOption⁵⁺

Name	Type	Description
icon	string	Path of the icon for a menu option.
content	string	Text content of a menu option.

Styles

In addition to the universal styles, the following styles are supported.

Name	Type	Default Value	Mandatory	Description
color	<color>	#e6000000	No	Text color of the multi-line text box.
font-size	<length>	16px	No	Font size of the multi-line text box.
allow-scale	boolean	true	No	Whether the font size changes with the system’s font size settings. If the config-changes tag of fontSize is configured for abilities in the config.json file, the setting takes effect without application restart.
placeholder-color	<color>	#99000000	No	Color of the hint text in the multi-line text box. This attribute is available when the component type is set to one of the following: text\|email\|date\|time\|number\|password.
font-weight	number \|string	normal	No	Font weight. For details, see font-weight of the <text> component.
font-family	string	sans-serif	No	Font family, in which fonts are separated by commas (,). Each font is set using a font name or font family name. The first font in the family or the specified custom font is used for the text.
caret-color⁶⁺	<color>	-	No	Color of the caret.

Events

In addition to the universal events, the following events are supported.

Name	Parameter	Description
change	{ text: newText, lines: textLines, height: textHeight }	Triggered when the input content changes. The input content, number of rows, and row height are obtained through the parameters. Since API version 5, if you change the value attribute directly, this event will not be triggered.
translate⁵⁺	{ value: selectedText }	Triggered when users click the translate button in the menu displayed after they select a text segment. The selected text content is returned.
share⁵⁺	{ value: selectedText }	Triggered when users click the share button in the menu displayed after they select a text segment. The selected text content is returned.
search⁵⁺	{ value: selectedText }	Triggered when users click the search button in the menu displayed after they select a text segment. The selected text content is returned.
optionselect⁵⁺	{ index:optionIndex, value: selectedText }	Triggered when users click a menu option in the menu displayed after they select a text segment. This event is valid only when the menuoptions attribute is set. The option index and selected text content are returned.
selectchange⁶⁺	{ start: number, end: number }	Triggered when the text selection changes.

Methods

The universal methods are supported.

Example

<!-- xxx.hml -->
<textarea id="textarea" class="textarea" extend="true" maxlength="20"
  headericon="/common/navigation_menu1_icon.svg" placeholder="Please input text"
  onchange="change">
</textarea>

/* xxx.css */
.textarea {
  placeholder-color: gray;
}

// xxx.js
import promptAction from '@ohos.promptAction';
export default {
change(e){
  promptAction.showToast({
    message: 'value: ' + e.text + ', lines: ' + e.lines + ', height: ' + e.height,
    duration: 3000,
  });
}
}

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