js-components-basic-qrcode.md

# qrcode

>  **NOTE**
>
>  This component is supported since API version 5. Updates will be marked with a superscript to indicate their earliest API version.

The **\<qrcode>** component is used to generate and display a QR code.

## Required Permissions

None


## Child Components

Not supported


## Attributes

In addition to the [universal attributes](../arkui-js/js-components-common-attributes.md), the following attributes are supported.

| Name   | Type    | Default Value | Mandatory  | Description                                      |
| ----- | ------ | ---- | ---- | ---------------------------------------- |
| value | string | -    | Yes   | Content used to generate the QR code.                             |
| type  | string | rect | No   | QR code type. Available values are as follows:<br>- **rect**: rectangular QR code.<br>- **circle**: round QR code.|


## Styles

In addition to the [universal styles](../arkui-js/js-components-common-styles.md), the following styles are supported.

| Name              | Type           | Default Value     | Mandatory  | Description      |
| ---------------- | ------------- | -------- | ---- | -------- |
| color            | &lt;color&gt; | \#000000 | No   | Color of the QR code.  |
| background-color | &lt;color&gt; | \#ffffff | No   | Background color of the QR code.|

>  **NOTE**
>  - If the values of **width** and **height** are different, the smaller value is used as the length of the QR code. The generated QR code is centered.
>
>
>  - If either **width** or **height** is set, the value is used as the length of the QR code. If neither of them is set, the default length 200 px is used.
>


## Events

The [universal events](../arkui-js/js-components-common-events.md) are supported.

## Methods

The [universal methods](../arkui-js/js-components-common-methods.md) are supported.


## Example

```html
<!-- xxx.hml -->
<div class="container">
  <qrcode value="{{qr_value}}" type="{{qr_type}}"
  style="color: {{qr_col}};background-color: {{qr_bcol}};width: {{qr_size}};height: {{qr_size}};margin-bottom: 70px;"></qrcode>
  <text class="txt">Type</text>
  <switch showtext="true" checked="true" texton="rect" textoff="circle" onchange="settype"></switch>
  <text class="txt">Color</text>
  <select onchange="setcol">
    <option for="{{col_list}}" value="{{$item}}">{{$item}}</option>
  </select>
  <text class="txt">Background Color</text>
  <select onchange="setbcol">
    <option for="{{bcol_list}}" value="{{$item}}">{{$item}}</option>
  </select>
</div>
```

```css
/* xxx.css */
.container {
  width: 100%;
  height: 100%;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
.txt {
  margin: 30px;
  color: orangered;
}
select{
  margin-top: 40px;
  margin-bottom: 40px;
}
```

```js
/* index.js */
export default {
  data: {
    qr_type: 'rect',
    qr_size: '300px',
    qr_col: '#87ceeb',
    col_list: ['#87ceeb','#fa8072','#da70d6','#80ff00ff','#00ff00ff'],
    qr_bcol: '#f0ffff',
    bcol_list: ['#f0ffff','#ffffe0','#d8bfd8']
  },
  settype(e) {
    if (e.checked) {
      this.qr_type = 'rect'
    } else {
      this.qr_type = 'circle'
    }
  },
  setcol(e) {
    this.qr_col = e.newValue
  },
  setbcol(e) {
    this.qr_bcol = e.newValue
  }
}
```

![12](figures/12.gif)