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# 🦓 \<qr-code-element\>

v0.1.0 - 22-02-2023

QR-Code WebComponent based on Project Nayuki Qr Code Library. Nayuki project aims to be the best, clearest library for generating QR Codes. Get more info at official page:

https://www.nayuki.io/page/qr-code-generator-library

Nayuki Qr Code Library v1.8.0 - Javascript

**SVG**
SVG is the default graphic format the Qr Code is build-up in the \<qr-code-element\> . Define the size of the WebComponent with a CSS custom properties: 

```css
/* size the qr code if svg */
qr-code-element {
  --size: 7rem;
}
```

Keep in mind that you can style the background and tile colors of the Qr Code with the attribute *bkColor* and *tileColor* as you can see in attributes table.

When the QrCode is render in SVG format the *scale* attribute can be use to set a ratio between the Qr Code dimension and the *border*. 

**Canvas**
Set the attribute *graphic-element* to canvas and the qr code will be render in a HTMLCanvasElement. The size of the canvas is managed mainly from the *scale* attribute, so try to change the scale attribute until you find the right size. When you have the *scale* you want to use you can adjust the pixel size of the qr code with the CSS applied to the \<qr-code-element\> , do NOT use only the CSS to get a big size of the qr code, penalty loss in graphic definition.

```html
<qr-code-element
    text="Hello World"
    graphic-element="canvas"
    scale="10"
    error-correction="medium">
<qr-code-element>
```

```css
qr-code-element {
  --size: 11rem;
}
```


<p align="center">
  <a href="#examples">examples</a> •
  <a href="#usage">usage</a> •
  <a href="#api">api</a> •
  <a href="#accessibility">accessibility</a> •
  <a href="#todo">TODO</a> •
</p>

## Examples

![Qr-Code-Element](https://cicciosgamino.web.app/images/qr-code.png)

```html
<qr-code-element
    text="Hello World"
    error-correction="medium">
</qr-code-element>
```

## 🚀 Usage

1. Install package
```bash
npm install --save @cicciosgamino/qr-code-element
```

2. Import
```html
<!-- Import Js Module -->
<script type="module">
  // Importing this module registers <qr-code-element> as an HTMLElement
  //
  // Note this import is a bare module specifier, so it must be converted
  // to a path using a server such as @web/dev-server or vite
  import '@cicciosgamino/qr-code-element'
</script>
```

3. Place in your HTML
```html
<qr-code-element
  text="Hello World"
  error-correction="medium"
  mask-pattern="-1">
</qr-code-element>
```

4. Use the component with LitElement
```javascript
import * from '@cicciosgamino/qr-code-element'

render () {
  return html`
    <qr-code-element
      text="Hello World"
      graphic-element="canvas"
      error-correction="medium"
      mask-pattern="-1">
    </qr-code-element>
  `
}
```

5. Set the url attribute with

```javascript
// plain html
document.querySelector('qr-code-element')
			.setAttribute('text','@NEW TEXT >TO ENCODE!')

// in lit element
this.renderRoot.querySelector('qr-code-element')
			.setAttribute('text','@HELLO >> New new World!')
```

## 🐝 API

### 📒 Properties/Attributes

| Name | Type | Default | Description
| ------------- | ------------- | ---------- | -------------------------------
| text          | String | `'@cicciosgamino'`| The Unicode Text string to Encode
| graphic-element | String | `'svg'`         | Render Qr Code in SVG or Canvas element [svg | canvas]
| scale         | Number | `10`              | Scale of Qr - Number greather than 1
| border        | Number | `1`               | Border of Qr - Number greather or equal to 0
| bk-color      | String | `#fff`            | Background Color
| tile-color    | String | `#000`            | Tile Color 
| error-correction | String | `'MEDIUM'`     | Error Correction level - LOW | MEDIUM | QARTILE | HIGH 

### Methods

| Name         | Description
| ------------ | -------------
| `getStatistics() => {}`    | Get Statistics about the Qr Code generated

### Events

No Events

### 🧁 CSS Custom Properties

| Name | Default | Description
| --------------- | ------- | --------------------------------
| `--size`        | `11rem` | SIZExSIZE when graphic-element=svg
| `--icon-size`   | `15% of --size` | SIZExSIZE of centered icon | slotted svg icon

### 🤖 Write HTML and JavaScript
Import the component's JavaScript module, use the component in your HTML, and control it with JavaScript, just like you would with a built-in element such as `<button>`:

```html
<!doctype html>
<html>
  <head>
    <meta charset="utf-8">
    <title>My Example App</title>

    <!-- Add support for Web Components to older browsers. -->
    <script src="./node_modules/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>

  </head>
  <body>
    <!-- Use Web Components in your HTML like regular built-in elements. -->
    <qr-code-element
      error-correction="medium"
      mask-pattern="-1">
    </qr-code-element>

    <!-- The Material Web Components use standard JavaScript modules. -->
    <script type="module">

      // Importing this module registers <progress-ring> as an element that you
      // can use in this page.
      //
      // Note this import is a bare module specifier, so it must be converted
      // to a path using a server such as @web/dev-server or vite.
      import '@cicciosgamino/qr-code-element'

      // Standard DOM APIs work with Web Components just like they do for
      // built-in elements.
      const qrCodeElement = document.querySelector('qr-code-element')
    </script>
  </body>
</html>
```

### 🚀 Serve
Serve your HTML with any server or build process that supports bare module specifier resolution (see next section):

```bash
# use globally instelled
npm install -g @web/dev-server

# install the project dev-dependencies and npm run
npm install
npm run dev
```

### Examples
In this example will use the component with an input field, so you can insert the text you want to transform into the Qr Code.

```html
<body>

    <div class="text">

      <input
        id="qrtext"
        type="text"
        name="qrtext"
        placeholder="text here ...">
      <label for="qrtext">QrText</label>

    </div>
    
    <qr-code-element
      error-correction="medium"
      mask-pattern="-1">
    </qr-code-element>

  <noscript>
    Please enable JavaScript to view this website.
  </noscript>

  <!-- Import Js Module from local file -->
  <script type="module" src="../qr-code-element.js"></script>

  <script>

    window.addEventListener('DOMContentLoaded', (e) => {

      const qrText = document.getElementById('qrtext')

      qrText.addEventListener('input', (e) => {
        
        const qrCodeElement = document.querySelector('qr-code-element')
        qrCodeElement.setAttribute('text', event.target.value)
      })

    })
  </script>

</body>
```

Check the examples folder if you need to copy some styles.


## Contributing

Got **something interesting** you'd like to **share**? Learn about [contributing](https://github.com/CICCIOSGAMINO/init/blob/master/CONTRIBUTING.md).

# Accessibility

# 🔧 TODO
- [ ] Slot the SVG image for center - Working on (1/2 functionality already in place)
- [ ] Basic Unit testing
- [ ] A11y compatible ?

# License
[GNU General Public License v3.0](https://github.com/CICCIOSGAMINO/init/blob/master/LICENSE)

Made 🧑‍💻 by [@cicciosgamino](https://cicciosgamino.web.app)