theme-switcher-component v1.0.2
Binary theme switcher component
A web component that helps you implement and change two themes on a web page. See the live demo and the code example.
Table of Contents
Usage flow example
- Install
With npm
npm i theme-switcher-component
With yarn
yarn add theme-switcher-component
- Import and declare the web component in a HTML file
<html>
<head>
<!--- ... More code above ... --->
<import src="./node_modules/theme-switcher-component/switch.js" type="module" defer>
<!--- ... More code below ... --->
</head>
<body>
<theme-switcher themes="["dark", "light"]"></theme-switcher>
<p>Hellow World</p>
</body>
</html>- Define a default theme in a CSS file via css custom properties
/* Define the default theme variables in the root element */
:root{ --paragraph-color: black; }
/* Change the variables values defined in root */
body[data-theme="dark"]{ --paragraph-color: white; }
p { color: var(--paragraph-color) }Documentation
Rules
- The first theme of the array "themes" defines the default theme.
- Obviously only two themes can be defined, hence the word "Binary" in the name lol.
| Attributes | Type | Required | Description | Error |
|---|---|---|---|---|
| themes | JSONArray of Strings | Yes | The two themes to define | If more than two themes defined or themes attribute undefined |
| verbose | bool | No | Logs to console information about the state of the component | None |
| data-theme | String | No | Added after the component is rendered | None |
JavaScript interface
A.K.A the instance properties
This can be used programmatically, you can control it with javascript
| Property | Type | Description |
|---|---|---|
| verbose | bool | Logs to console information about the state of the component |
| currenState | number | The currentState of the state machine |
| currentTheme | String | The theme that is currently applied |
Do not use any of the methods like prepareTheme(), transition(), otherwise the component can be set to a wrong state, to make state changes with javascript use the click() method
CSS variables
The variables are defined on the host element, these are the default values
theme-switcher {
--switch-color: black;
--switch-width: 60px;
--switch-height: 34px;
--switch-radius: 34px;
--slider-width: 25px;
--slider-height: 25px;
--slider-margin: 4px 2px 0px 5px;
--slider-transition: .4s;
--slider-radius: 50%;
--slider-cursor: pointer;
--slider-color: white;
--slider-translatex-unswitched: translateX(0px);
--slider-translatex-switched: translateX(26px);
}What the component does
Adds and updates the data attribute "data-theme" to the body element which can be used in CSS to react when the value changes with attribute selectors.
Every time the theme changes gets set to local storage.
It handles the state via a super simple state machine inspired by this article.