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agnostic packages"],"sub_categories":["Scrolling"],"readme":"# scroll-watcher\n\n\u003cp align=\"center\"\u003e\n  \u003ca href=\"https://travis-ci.org/jonataswalker/scroll-watcher\"\u003e\n    \u003cimg src=\"https://travis-ci.org/jonataswalker/scroll-watcher.svg?branch=master\" alt=\"build status\"\u003e\n  \u003c/a\u003e\n  \u003ca href=\"https://www.npmjs.com/package/scroll-watcher\"\u003e\n    \u003cimg src=\"https://img.shields.io/npm/v/scroll-watcher.svg\"\n      alt=\"npm version\"\u003e\n  \u003c/a\u003e\n  \u003ca href=\"https://github.com/jonataswalker/scroll-watcher/blob/master/LICENSE.md\"\u003e\n    \u003cimg src=\"https://img.shields.io/npm/l/scroll-watcher.svg\"\n      alt=\"license\"\u003e\n  \u003c/a\u003e\n  \u003ca href=\"https://david-dm.org/jonataswalker/scroll-watcher\"\u003e\n    \u003cimg src=\"https://david-dm.org/jonataswalker/scroll-watcher/status.svg\"\n      alt=\"dependency status\"\u003e\n  \u003c/a\u003e\n  \u003ca href=\"https://david-dm.org/jonataswalker/scroll-watcher\"\u003e\n    \u003cimg src=\"https://david-dm.org/jonataswalker/scroll-watcher/dev-status.svg\" alt=\"devDependency status\"\u003e\n  \u003c/a\u003e\n\u003c/p\u003e\n\nA lightweight, blazing fast, [rAF](https://developer.mozilla.org/en-US/docs/Web/API/window/requestAnimationFrame) based, scroll watcher.\n\nA more up-to-date approach to this **_scrolling watchers_** stuff. Slightly inspired by [scrollMonitor](https://github.com/stutrek/scrollMonitor).\n\n### Demos\n\n\u0026#8594; [Scrolling, Moving and Recalculating](https://jonataswalker.github.io/scroll-watcher/examples/example.html)\n\n\u0026#8594; [Static Website Menu](https://jonataswalker.github.io/scroll-watcher/examples/example2.html)\n\n## How to use it?\n\n##### \u0026#8594; CDN Hosted - [jsDelivr](http://www.jsdelivr.com/projects/scroll-watcher)\n\n```HTML\n\u003cscript src=\"https://cdn.jsdelivr.net/npm/scroll-watcher@latest/dist/scroll-watcher.min.js\"\u003e\u003c/script\u003e\n```\n\n##### \u0026#8594; Self hosted\n\nDownload [latest release](https://github.com/jonataswalker/scroll-watcher/releases/latest).\n\n##### \u0026#8594; [NPM](https://www.npmjs.com/package/scroll-watcher)\n\n```shell\nnpm install scroll-watcher\n```\n\n##### Instantiate and watch for a specific (or a list) DOM element\n\n```javascript\nvar scroll = new ScrollWatcher();\nscroll\n  .watch(\"my-element\")\n  .on(\"enter\", function(evt) {\n    console.log(\"I'm partially inside viewport\");\n  })\n  .on(\"enter:full\", function(evt) {\n    console.log(\"I'm entirely within the viewport\");\n  })\n  .on(\"exit:partial\", function(evt) {\n    console.log(\"I'm partially out of viewport\");\n  })\n  .on(\"exit\", function(evt) {\n    console.log(\"I'm out of viewport\");\n  });\n```\n\n##### Make some decision when page is loaded (or reloaded)\n\n```javascript\nwatcher.on(\"page:load\", function(evt) {\n  // maybe trigger a scroll?\n  window.setTimeout(() =\u003e window.scrollBy(0, 1), 20);\n});\n```\n\n## Instance Methods\n\n### watch(target[, offset])\n\n- `target` - `{String|Element}` String or DOM node.\n- `offset` - `{Number|Object|undefined}` (optional) Element offset.\n\n###### Returns:\n\n- Methods\n  - `on/once/off` - common events\n  - `update` - updates the location of the element in relation to the document\n- Properties\n  - `target` - DOM node being watched\n\n#### windowAtBottom([offset])\n\n- `offset` - `{Number|undefined}` (optional) How far to offset.\n\n#### windowAtTop([offset])\n\n- `offset` - `{Number|undefined}` (optional) How far to offset.\n\n## Instance Events - `on/once/off`\n\nYou can simply watch for scrolling action:\n\n```javascript\nvar watcher = new ScrollWatcher();\nwatcher.on(\"scrolling\", function(evt) {\n  console.log(evt);\n});\n\n// or just once\nwatcher.once(\"scrolling\", function(evt) {\n  console.log(evt);\n});\n\n// and turn it off (later)\nwatcher.off(\"scrolling\");\n```\n\n## License\n\n[MIT](https://github.com/jonataswalker/scroll-watcher/blob/master/LICENSE.md)\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjonataswalker%2Fscroll-watcher","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fjonataswalker%2Fscroll-watcher","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjonataswalker%2Fscroll-watcher/lists"}