# Trimmer

An HTML representation of a trimmer potentio meter.

## Default usage

Import the trimmer to your project:

```javascript
// ES6
import { trimmer } from '@navelpluisje/pcb-components/src';
// Or for example an Electron project
const { trimmer } = require('@navelpluisje/pcb-components/dist/umd');

// Then call the function. This will make the component avalaible in the DOM
trimmer();
```

When included you can use the `np-trimmer` tag to use it in your code.

```
<np-trimmer />
```

This will generate the next resistor:

![default dip switch](assets/trimmer-1.png)

## Value

By clicking the resistor, or the value, an inputfield will appear. Type the value of the resistor, blur the field and see the color-bands change to the corresponding colors for the value.

## Attributes

* `min` (default: 0): The minimal value of the trimmer
* `max` (default: 10): The maximal value of the trimmer
* `step` (default: 0.5): The step-size of the resistor
* `value` (default: 0): The initial value for the resistor
* `color`: The default color for the switch. This is the first parameter of the `hsl`-color, the color in degrees. ([More on HSL](https://developer.mozilla.org/en-US/docs/Web/CSS/color_value#hsl()))

> An example with most of the attributs set:
> ```html
>  <np-trimmer
>    max="6"
>    step="1"
>    value="2"
>    color="60"
>  ></np-trimmer>
> ```
>![default dip switch](assets/trimmer-value.png)


## Events

The trimmer has one event you can listen to: The `change` event. This works like the change event of any input-element. The current value of the trimmer is the value property of the event target.

```
  document.querySelector('np-trimmer')
    .addEventListener(
      'change',
      (evt) => console.log(evt.target.value)
    );
```
This will print the current value of the trimmer in the console