Compute Anchor

This is a small package, listening scroll or wheel or touchmove event of the given DOM element, for compute the most compatible anchor in AnchorList. And its

Getting Started

Prerequisites

This package support both pc and mobile.

Installing

$ npm install compute-anchor

Usage

let dispose = computeAnchor({// add event listener on element
    element: document.getElementById('container'),
    anchors: ['title', 'getting start', 'installing', 'usage'],
    callback: anchor => console.log(anchor),
    offset: {
      top: 80,
      bottom: 0
    }
})

dispose()// remove event listener on element

API

computeAnchor

src/compute-anchor.js:26-33

This function accept an element and some other options, to start listening element's event for compute anchor

Parameters

• options {Object}
  • options.element {DOMNode} which dom element contains all anchors and its scrollable (optional, default window)
  • options.events {String[]} which events will add on options.elements (optional, default ['scroll','resize'])
  • options.anchors {String[]} all anchors you care about, and it just anchor name, don't start with #
  • options.callback {Function} callback will invoke when compute handler returns a new anchor if compute handler returns the same result, callback will not be invoked callback(anchor){}
  • options.defaultAnchor {String} if can't find any fit anchor, callback will receive defaultAnchor (optional, default '')
  • options.offset {Number[]} offset[0] is top offset, offset[1] is bottom offset when your input element has some fixed top or fixed bottom children, options.offset if useful (optional, default [0,0])
  • options.wait {Number} wait is time in MS for eventListener wait time (optional, default 20)

Returns Function the function to remove all eventListener on element

Running the tests

TODO

Contributing

There's no other contributor

Authors

teeeemoji mailto:teeeemoji@163.com

License

This project is licensed under the MIT License - see the LICENSE file for details

Task

important

• write test
• publish this package

others

• friendly way to write demo