Storybook Addon Knobs 

Knobs allow you to edit React props dynamically using the Storybook UI.
You can also use Knobs as a dynamic variable inside stories.

This is how Knobs look like:


> Checkout the above Live Storybook or watch this video.

Getting Started

First of all, you need to install knobs into your project as a dev dependency.

``js
npm i -D @kadira/storybook-addon-knobs
`

Then, configure it as an addon by adding it to your addons.js file (located in the Storybook config directory).

`js
// To get our default addons (actions and links)
import '@kadira/storybook/addons';
// To add the knobs addon
import '@kadira/storybook-addon-knobs/register'
`

Now, write your stories with knobs.

`js
import React from 'react';
import { storiesOf } from '@kadira/storybook';
import { withKnobs, text, boolean, number } from '@kadira/storybook-addon-knobs';

const stories = storiesOf('Storybook Knobs', module);

// Add the withKnobs decorator to add knobs support to your stories.
// You can also configure withKnobs as a global decorator.
stories.addDecorator(withKnobs);

// Knobs for React props
stories.add('with a button', () => (
disabled={boolean('Disabled', false)}
>
{text('Label', 'Hello Button')}

))

// Knobs as dynamic variables.
stories.add('as dynamic variables', () => {
const name = text('Name', 'Arunoda Susiripala');
const age = number('Age', 89);

const content = I am ${name} and I'm ${age} years old.;
return (

);
});
`

You can see your Knobs in a Storybook panel as shown below.


$3

* Introduction blog post.
* Watch this video on how to use knobs
* Live Storybook with Knobs
* Have a look at this sample Storybook repo.

Available Knobs

These are the knobs available for you to use. You can import these Knobs from the @kadira/storybook-addon-knobs module.
Here's how to import the text Knob.

`js
import { text } from '@kadira/storybook-addon-knobs';
`

Just like that, you can import any other following Knobs:

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Allows you to get some text from the user.

`js
const label = 'Your Name';
const defaultValue = 'Arunoda Susiripala';

const value = text(label, defaultValue);
`

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Allows you to get a boolean value from the user.

`js
const label = 'Agree?';
const defaultValue = false;

const value = boolean(label, defaultValue);
`

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Allows you to get a number from the user.

`js
const label = 'Age';
const defaultValue = 78;

const value = number(label, defaultValue);
`

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Allows you to get a number from the user using a range slider.

`js
const label = 'Temperature';
const defaultValue = 73;
const options = {
range: true,
min: 60,
max: 90,
step: 1,
};

const value = number(label, defaultValue, options);
`

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Allows you to get a color from the user.

`js
const label = 'Color';
const defaultValue = '#ff00ff';

const value = color(label, defaultValue);
`

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Allows you to get a JSON object from the user.

`js
const label = 'Styles';
const defaultValue = {
backgroundColor: 'red'
};

const value = object(label, defaultValue);
`

> Make sure to enter valid JSON syntax while editing values inside the knob.

$3

Allows you to get an array from the user.

`js
const label = 'Styles';
const defaultValue = ['Red']

const value = array(label, defaultValue);
`

> While editing values inside the knob, you will need to use a separator. By default it's a comma, but this can be
override by passing a separator variable.
> `js
> const separator = ':';
> const value = array(label, defaultValue, separator);
> `

$3

Allows you to get a value from a select box from the user.

`js
const label = 'Colors';
const options = {
red: 'Red',
blue: 'Blue',
yellow: 'Yellow',
};
const defaultValue = 'red';

const value = select(label, options, defaultValue);
`

> You can also provide options as an array like this: ['red', 'blue', 'yellow']

$3

Allow you to get date (and time) from the user.

`js
const label = 'Event Date';
const defaultValue = new Date('Jan 20 2017');
const value = date(label, defaultValue);
`

Typescript

If you are using typescript, make sure you have the type definitions installed for the following libs:

- node
- react

You can install them using npm i -S @types/node @types/react`, assuming you are using Typescript >2.0.