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reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":[],"created_at":"2026-01-12T10:42:39.726Z","updated_at":"2026-01-12T10:42:40.389Z","avatar_url":"https://github.com/fireyy.png","language":"JavaScript","funding_links":[],"categories":[],"sub_categories":[],"readme":"# kansatsu\n\n\u003e A wrapper of Intersection Observer API.\n\nKansatsu is a Japanese word [観察 (かんさつ)](https://en.wiktionary.org/wiki/観察) in Rōmaji, which means observe.\n\n## Getting started\n\nYou may need a library polyfills the native IntersectionObserver API in unsupporting browsers. [w3c IntersectionObserver polyfill](https://github.com/w3c/IntersectionObserver/tree/master/polyfill)\n\n## Install\n\nThis project uses [node](http://nodejs.org) and [npm](https://npmjs.com). Go check them out if you don't have them locally installed.\n\n```sh\n$ npm install --save kansatsu\n```\n\nor if you use [yarn](https://yarnpkg.com).\n\n```sh\n$ yarn add kansatsu\n```\n\nThen with a module bundler like [rollup](http://rollupjs.org/) or [webpack](https://webpack.js.org/), use as you would anything else:\n\n```javascript\n// using ES6 modules\nimport Kansatsu from 'kansatsu'\n\n// using CommonJS modules\nvar Kansatsu = require('kansatsu')\n```\n\nThe [UMD](https://github.com/umdjs/umd) build is also available on [unpkg](https://unpkg.com):\n\n```html\n\u003cscript src=\"//unpkg.com/kansatsu/dist/kansatsu.umd.js\"\u003e\u003c/script\u003e\n```\n\nThis exposes the `Kansatsu()` function as a global.\n\n* * *\n\n## Usage\n\n```html\n\u003cdiv class=\"man\"\u003e\u003c/div\u003e\n\u003cdiv class=\"man\"\u003e\u003c/div\u003e\n\u003cdiv class=\"man\"\u003e\u003c/div\u003e\n```\n\n```js\nimport Kansatsu from 'kansatsu';\n\nconst man = document.querySelectorAll('.man')\nlet kansatsu = Kansatsu({\n  offset: 100,\n  callback (el, isAppear, unwatch) {\n    if (isAppear) {\n      el.classList.add('is-appear')\n      unwatch()\n    }\n  }\n})\nArray.from(man).forEach(el =\u003e kansatsu.watch(el))\n```\n\n## Examples \u0026 Demos\n\n[**Real Example on JSFiddle**](https://jsfiddle.net/fireyy/g1740zm7/) ➡️\n\n## API\n\nKansatsu's API is organized as follows:\n\n### `Kansatsu(options: Object)`\n\nKansatsu will account for the following properties in options:\n\n  * `root` for `root` pass to the [`IntersectionObserver()`](https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API) API. Default null.\n  * `appear` for `threshold` pass to the [`IntersectionObserver()`](https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API) API. Default 0.\n  * `offset` the percent used by `rootMargin`. Default 0.\n      ```js\n        // offset 20\n        // rootMargin = '20% 0px'\n      ```\n  * `rootMargin` for `rootMargin` pass to the [`IntersectionObserver()`](https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API) API. Default '0%'.\n  * `callback` the callback fot the `observe` action.\n\n      ```js\n        callback (el, isAppear, unwatch) {\n          if (isAppear) {\n            el.classList.add('is-appear')\n            unwatch()\n          }\n        }\n      ```\n\n### `watch()`\n\nThe wrap for `observe`\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Ffireyy%2Fkansatsu","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Ffireyy%2Fkansatsu","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Ffireyy%2Fkansatsu/lists"}