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## Viewfinder Webcomponent

![version](https://img.shields.io/npm/v/viewfinder-component.svg)
![downloads](https://img.shields.io/npm/dm/viewfinder-component.svg)
![jsdelivr](https://img.shields.io/jsdelivr/npm/hm/viewfinder-component.svg)

Viewfinder web component for barcode scanning.

![screenshot](https://github.com/xulihang/viewfinder-web-component/raw/main/screenshot.jpg)

[Online barcode scanner demo](https://starlit-duckanoo-55c6c9.netlify.app/)

### Usage

In your HTML, add the component:

```html
<view-finder></view-finder>
```


You can define the width, the height, the scan region and the styles like this:

```html
<view-finder 
  style="--scan-line-color:orange;
         --scan-rect-color:orange;"
  width="1280"
  height="720"
  left="320"
  right="960"
  top="180"
  bottom="540"
  preserve-aspect-ratio="xMidYMid slice">
</view-finder>
```

If you need to set multiple regions, then use the `regions` prop.

```js
document.querySelector("view-finder").regions = [
  {
    left:300,
    top:180,
    right: 500,
    bottom: 540,
  },
  {
    left:600,
    top:180,
    right: 800,
    bottom: 540,
  }
];
```

## Install this component

### Script tag

- Put a script tag similar to this 

   ```html
   <script type="module">
     import { defineCustomElements } from 'https://cdn.jsdelivr.net/npm/viewfinder-component/dist/esm/loader.js';
     defineCustomElements();
   </script>
   ```
   
   in the head of your index.html
   
- Then you can use the element anywhere in your template, JSX, html etc

### Node Modules
- Run `npm install viewfinder-component --save`
- Put a script tag similar to this 

   ```html
   <script type="module">
     import { defineCustomElements } from 'node_modules/viewfinder-component/dist/esm/loader.js';
     defineCustomElements();
   </script>
   ```
   
   in the head of your index.html
   
- Then you can use the element anywhere in your template, JSX, html etc