jake/dark-mode
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add onInit and onChange callback function options

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This commit is contained in:
Jake Jarvis 2021-08-05 07:54:47 -04:00
parent 8b40221791
commit cfa1f575e3
Signed by: jake
GPG Key ID: 2B0C9CF251E69A39
6 changed files with 53 additions and 38 deletions
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4
README.md
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@ -20,6 +20,8 @@ Very simple CSS dark/light mode toggler with saved preference via local storage
- **classes:** An object containing the `<body>` class names for the light and dark themes. (optional, default: `{ light: "light", dark: "dark" }`) - **classes:** An object containing the `<body>` class names for the light and dark themes. (optional, default: `{ light: "light", dark: "dark" }`)
- **default:** The initial `<body>` class hard-coded into the HTML template. (optional, default: `"light"`) - **default:** The initial `<body>` class hard-coded into the HTML template. (optional, default: `"light"`)
- **storageKey:** Name of the `localStorage` key holding the user's preference. (optional, default: `"dark_mode_pref"`) - **storageKey:** Name of the `localStorage` key holding the user's preference. (optional, default: `"dark_mode_pref"`)
- **onInit(toggle?)** Callback function executed at the end of initialization. The toggle above is passed in if set. (optional, default: `null`)
- **onChange(theme?, toggle?)** Callback function executed when theme is switched. The new theme and the toggle above (if set) are passed in. (optional, default: `null`)
### Browser ### Browser
@ -83,8 +85,8 @@ darkMode.init({
## To-Do ## To-Do
- [ ] Support more than two themes - [ ] Support more than two themes
- [ ] Add callback function `onChange` (or `onToggle` etc.) passed in as an option
- [ ] Better readme docs - [ ] Better readme docs
- [x] Add callback function `onChange` (or `onToggle` etc.) passed in as an option
## License ## License

4
example/index.html
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@ -51,6 +51,10 @@
<script> <script>
window.darkMode.init({ window.darkMode.init({
toggle: document.querySelector(".dark-mode-toggle"), toggle: document.querySelector(".dark-mode-toggle"),
onInit: function (t) {
t.style.visibility = "visible";
console.log("Toggle is visible now that we know user has JS enabled.");
}
}); });
</script> </script>
</body> </body>

4
package.json
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@ -19,7 +19,7 @@
"scripts": { "scripts": {
"build": "rollup -c", "build": "rollup -c",
"lint": "eslint src/**/*.js", "lint": "eslint src/**/*.js",
"prepublishOnly": "yarn build" "prepublishOnly": "rm -rf dist && yarn build"
}, },
"dependencies": {}, "dependencies": {},
"devDependencies": { "devDependencies": {
@ -30,7 +30,7 @@
"@rollup/plugin-node-resolve": "^13.0.4", "@rollup/plugin-node-resolve": "^13.0.4",
"eslint": "^7.32.0", "eslint": "^7.32.0",
"eslint-plugin-compat": "^3.11.1", "eslint-plugin-compat": "^3.11.1",
"rollup": "^2.55.1", "rollup": "^2.56.0",
"rollup-plugin-copy": "^3.4.0", "rollup-plugin-copy": "^3.4.0",
"rollup-plugin-filesize": "^9.1.1", "rollup-plugin-filesize": "^9.1.1",
"rollup-plugin-terser": "^7.0.2" "rollup-plugin-terser": "^7.0.2"

2
src/index.d.ts vendored
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@ -3,4 +3,6 @@ export function init(options?: {
classes?: { dark: string, light: string }; classes?: { dark: string, light: string };
default?: string; default?: string;
storageKey?: string; storageKey?: string;
onInit?: (toggle?: HTMLElement) => void;
onChange?: (theme?: string, toggle?: HTMLElement) => void;
}): void; }): void;

13
src/index.js
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@ -31,6 +31,11 @@ const init = function (options) {
if (storageAvailable && !!remember) { if (storageAvailable && !!remember) {
localStorage.setItem(storageKey, theme); localStorage.setItem(storageKey, theme);
} }
// optional onChange callback function passed as option
if (typeof options.onChange === "function") {
options.onChange(theme, toggle);
}
}; };
// user has never clicked the button, so go by their OS preference until/if they do so // user has never clicked the button, so go by their OS preference until/if they do so
@ -72,9 +77,6 @@ const init = function (options) {
// don't freak out if page happens not to have a toggle // don't freak out if page happens not to have a toggle
if (toggle !== null) { if (toggle !== null) {
// toggle re-appears now that we know user has JS enabled
toggle.style.visibility = "visible";
// handle toggle click // handle toggle click
toggle.addEventListener("click", function () { toggle.addEventListener("click", function () {
// switch to the opposite theme & save preference in local storage // switch to the opposite theme & save preference in local storage
@ -85,6 +87,11 @@ const init = function (options) {
} }
}); });
} }
// optional onInit callback function passed as option
if (typeof options.onInit === "function") {
options.onInit(toggle);
}
}; };
// recommended method (by MDN) to detect localStorage availability: // recommended method (by MDN) to detect localStorage availability:

8
yarn.lock
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@ -3002,10 +3002,10 @@ rollup-plugin-terser@^7.0.2:
serialize-javascript "^4.0.0" serialize-javascript "^4.0.0"
terser "^5.0.0" terser "^5.0.0"
rollup@^2.55.1: rollup@^2.56.0:
version "2.55.1" version "2.56.0"
resolved "https://registry.yarnpkg.com/rollup/-/rollup-2.55.1.tgz#66a444648e2fb603d8e329e77a61c608a6510fda" resolved "https://registry.yarnpkg.com/rollup/-/rollup-2.56.0.tgz#daa832955d2b58f1ed52a3c4c85b7d1adaf076d0"
integrity sha512-1P9w5fpb6b4qroePh8vHKGIvPNxwoCQhjJpIqfZGHLKpZ0xcU2/XBmFxFbc9697/6bmHpmFTLk5R1dAQhFSo0g== integrity sha512-weEafgbjbHCnrtJPNyCrhYnjP62AkF04P0BcV/1mofy1+gytWln4VVB1OK462cq2EAyWzRDpTMheSP/o+quoiA==
optionalDependencies: optionalDependencies:
fsevents "~2.3.2" fsevents "~2.3.2"