@decidables/decidables-elementsWeb Components for Basic UI in decidables

This package provides basic user interface web components for use in all of the explorables. This facilitates a consistent look and feel. They try to use the native inputs when possible, but build on them for new elements like a switch, and composite elements like a slider with a linked spinner.

Usage

Install

yarn add @decidables/decidables-elements

Use

import '@decidables/decidables-elements';

A bare import is used to register the elements in the custom registry, so they are then available for use in HTML.

Contents

Components

DecidablesButton / <decidables-button>

Button for taking actions

Slots

• unnamed
  • Inline content as label

Attributes

• disabled: boolean = false
  • In disabled state user can't interact

Example

<decidables-button disabled>
  Click me
</decidables-button>

DecidablesSlider / <decidables-slider>

Slider w/spinner for selecting a numeric value from a range

Slots

• unnamed
  • Inline content as label

Attributes

• disabled: boolean = false
  • In disabled state user can't interact
• max: number = undefined
  • Maximum value the slider can take
• min: number = undefined
  • Minimum value the slider can take
• step: number = undefined
  • Amount that value increments with smallest movement of the slider
• value: number = undefined
  • Initial value of the slider

Example

<decidables-slider disabled max="0" min="100" step="2" value="50">
  Move me
</decidables-slider>

DecidablesSpinner / <decidables-spinner>

Text field w/spinner arrows for selecting a continuous numeric value

Slots

• unnamed
  • Inline content as label

Attributes

• disabled: boolean = false
  • In disabled state user can't interact
• max: number = undefined
  • Maximum value the slider can take
• min: number = undefined
  • Minimum value the slider can take
• step: number = undefined
  • Amount that value increments with smallest movement of the slider
• value: number = undefined
  • Initial value of the slider

Example

<decidables-spinner disabled max="0" min="100" step="2" value="50">
  Change me
</decidables-spinner>

DecidablesSwitch / <decidables-switch>

Switch for turning an option on or off

Slots

• unnamed
  • Inline content as label for on state
• off-label
  • Inline content as label for off state

Attributes

• disabled: boolean = false
  • In disabled state user can't interact
• checked: number = false
  • Whether the switch is on (true) or off (false)

Example

<decidables-switch disabled checked>
  <span>On</span>
  <span slot="off-label">Off</span>
</decidables-switch>

DecidablesToggleOption / <decidables-toggle-option>

One option in a toggle set

Slots

• unnamed
  • Inline content as label for option

Attributes

• disabled: boolean = false
  • In disabled state user can't interact
• checked: number = false
  • Whether the option is selected (true) or not ('false`)
• name: string = undefined
  • An identifier to be shared by all options in a mutually exclusive group
• value: string = undefined
  • An identifier specific to this option to uniquely identify it in the group

Example

<decidables-toggle-option disabled name="flavors" value="chocolate" checked>
  Chocolate
</decidables-toggle-option>

DecidablesToggle / <decidables-toggle>

Toggle for selecting one option from a set

Slots

• unnamed
  • Inline content as label for set
• label
  • Inline content as legend for options

Attributes

• disabled: boolean = false
  • In disabled state user can't interact

Example

<decidables-toggle disabled>
  <span>Pick one</span>
  <span slot="label">Flavors</span>
  <decidables-toggle-option disabled name="flavors" value="chocolate">
    Chocolate
  </decidables-toggle-option>
  <decidables-toggle-option disabled name="flavors" value="strawberry">
    Strawberry
  </decidables-toggle-option>
  <decidables-toggle-option disabled name="flavors" value="vanilla" checked>
    Vanilla
  </decidables-toggle-option>
</decidables-toggle>

Base class

DecidablesElement

Base class for all decidables web components

To define a new element:

export default class DecidablesSomething extends DecidablesElement {
  ...
}

This library is built on Lit, so the resulting DecidableElement is also a LitElement

Utilities

DecidablesConverterArray

Utility for attributes that can take an array of values

If you are defining a DecidablesElement with an attribute that can take an array of numbers, then you can use this to automatically convert between a space-separated list as the attribute and an Array of numbers as the property:

static get properties() {
  return {
    stuff: {
      attribute: 'values',
      converter: DecidablesConverterArray,
      reflect: true,
    },
  };
};

<decidables-something values="1.23 3.56 -2.97"></decidables-something>

And this.values will be the Array: [1.23 3.56 -2.97]

DecidablesConverterSet

Utility for attributes that can take a set of values

If you are defining a DecidablesElement with an attribute that can take a set of string values, then you can use this to automatically convert between a space-separated list as the attribute and a Set of strings as the property:

static get properties() {
  return {
    stuff: {
      attribute: 'stuff',
      converter: DecidablesConverterSet,
      reflect: true,
    },
  };
};

<decidables-something stuff="this that other"></decidables-something>

And this.stuff will be a Set with members: 'this', 'that', and 'other'

Development

Features/Bugs/Notes

• Custom spinner that looks better than User Agent spinners?
• Edge/IE11 - slider shadow is clipped
• Edge/IE11 - no arrows for numeric controls
• Firefox - spinner arrows look ugly and asymmetrical
• IE11 - No CSS variables outside custom elements (and not patched by ShadyCSS!)

Package Scripts

• yarn lint
  • Lints markdown, scripts and styles
• yarn test
  • Runs all tests and reports coverage in test/coverage/
• yarn test:watch
  • Runs all tests in watch mode and reports coverage in test/coverage/
• yarn test:file <filename>
  • Runs tests for a single file and reports coverage in test/coverage/
• yarn build
  • Builds bundles from src/ to lib/

File Organization

• decidables-elements/
  • lib/ (Bundles created from src/ by build) [autogenerated]
  • src/ (Source files)
  • test/ (Testing files)
    • coverage/ (Code coverage results) [autogenerated]
  • CHANGELOG.md (Based on conventional commits) [autogenerated]
  • gulpfile.js (Tasks for gulp)
  • package.json (Package config for yarn and npm)
  • README.md (This file)
  • rollup-stats.html (Report on js bundle composition and size) [autogenerated]

License

The content of this project is licensed under Creative Commons Attribution-ShareAlike 4.0 International License (CC-BY-SA-4.0) and the source code of this project is licensed under GNU General Public License v3.0 or any later version (GPL-3.0-or-later).