import { Story, Meta, Preview, html } from '@open-wc/demoing-storybook';
import { loadDefaultFeedbackMessages, MaxLength, MinLength, Required } from '@lion/validate';

import '../lion-textarea.js';

<Meta title="Forms/Textarea" parameters={{ component: 'lion-textarea' }} />

# Textarea

`lion-textarea` is a webcomponent that enhances the functionality of the native `<input type="textarea">` element.
Its purpose is to provide a way for users to write text that is multiple lines long.

<Preview>
  <Story name="default">
    {html`
      <lion-textarea label="Stops growing after 4 rows" max-rows="4"></lion-textarea>
    `}
  </Story>
</Preview>

Default rows is 2 and it will grow to max-rows of 6.

## Features

- `max-rows` attribute to set the amount of rows it should resize to, before it will scroll
- `rows` attribute to set the minimum amount of rows
- `readonly` attribute to prevent changing the content

## How to use

### Installation

```sh
npm i --save @lion/textarea
```

```js
import '@lion/textarea/lion-textarea.js';
```

## Examples

### Prefilled

You can prefill the textarea. If you want to prefill on multiline, you will have to add newline characters `'\n'`.

<Preview>
  <Story name="Prefilled">
    {html`
      <lion-textarea
        label="Prefilled"
        .modelValue=${['batman', 'and', 'robin'].join('\n')}
      ></lion-textarea>
    `}
  </Story>
</Preview>

### Disabled

The textarea can be disabled with the `disabled` attribute.

<Preview>
  <Story name="Disabled">
    {html`
      <lion-textarea label="Disabled" disabled></lion-textarea>
    `}
  </Story>
</Preview>

### Readonly

`readonly` attribute indicate that you can't change the content. Compared with `disabled` attribute, the `readonly` attribute doesn't prevent clicking or selecting the element.

<Preview>
  <Story name="Readonly">
    {html`
      <lion-textarea 
        label="Readonly" 
        readonly
        .modelValue=${['batman', 'and', 'robin'].join('\n')}
      ></lion-textarea>
    `}
  </Story>
</Preview>

### Stop growing

Use the `max-rows` attribute to make it stop growing after a certain amount of lines.

<Preview>
  <Story name="Stop growing">
    {html`
      <lion-textarea
        label="Stop growing"
        max-rows="4"
        .modelValue=${['batman', 'and', 'robin'].join('\n')}
      ></lion-textarea>
    `}
  </Story>
</Preview>

### Non-growing

To have a fixed size provide `rows` and `max-rows` with the same value.

<Preview>
  <Story name="Non-growing">
    {html`
      <lion-textarea label="Non Growing" rows="3" max-rows="3"></lion-textarea>
    `}
  </Story>
</Preview>

### Validation

The textarea can have validation.

<Story name="Validation">
  {() => {
    loadDefaultFeedbackMessages();
    return html`
      <lion-textarea
        .validators="${[new Required(), new MinLength(10), new MaxLength(400)]}"
        label="String"
        .modelValue="${'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.'}"
      ></lion-textarea>
    `;
  }}
</Story>

```js
import { loadDefaultFeedbackMessages, MaxLength, MinLength, Required } from '@lion/validate';

loadDefaultFeedbackMessages();
```

```html
<lion-textarea
  .validators="${[new Required(), new MinLength(10), new MaxLength(400)]}"
  label="String"
  .modelValue="${'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.'}"
></lion-textarea>
```