patternlibrary/sass/styleguide-builder/kss-assets/scrollspy.js
2018-06-20 21:38:13 -04:00

147 lines
3.7 KiB
JavaScript

(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
function ScrollSpy (wrapper, opt) {
this.doc = document;
this.wrapper = (typeof wrapper === 'string') ? this.doc.querySelector(wrapper) : wrapper;
this.nav = this.wrapper.querySelectorAll(opt.nav);
this.contents = [];
this.win = window;
this.winH = this.win.innerHeight;
this.className = opt.className;
this.callback = opt.callback;
this.init();
}
ScrollSpy.prototype.init = function () {
this.contents = this.getContents();
this.attachEvent();
};
ScrollSpy.prototype.getContents = function () {
var targetList = [];
for (var i = 0, max = this.nav.length; i < max; i++) {
var href = this.nav[i].href;
targetList.push(this.doc.getElementById(href.split('#')[1]));
}
return targetList;
};
ScrollSpy.prototype.attachEvent = function () {
this.win.addEventListener('load', (function () {
this.spy(this.callback);
}).bind(this));
var scrollingTimer;
this.win.addEventListener('scroll', (function () {
if (scrollingTimer) {
clearTimeout(scrollingTimer);
}
var _this = this;
scrollingTimer = setTimeout(function () {
_this.spy(_this.callback);
}, 10);
}).bind(this));
var resizingTimer;
this.win.addEventListener('resize', (function () {
if (resizingTimer) {
clearTimeout(resizingTimer);
}
var _this = this;
resizingTimer = setTimeout(function () {
_this.spy(_this.callback);
}, 10);
}).bind(this));
};
ScrollSpy.prototype.spy = function (cb) {
var elems = this.getElemsViewState();
this.markNav(elems);
if (typeof cb === 'function') {
cb(elems);
}
};
ScrollSpy.prototype.getElemsViewState = function () {
var elemsInView = [],
elemsOutView = [],
viewStatusList = [];
for (var i = 0, max = this.contents.length; i < max; i++) {
var currentContent = this.contents[i],
isInView = this.isInView(currentContent);
if (isInView) {
elemsInView.push(currentContent);
} else {
elemsOutView.push(currentContent);
}
viewStatusList.push(isInView);
}
return {
inView: elemsInView,
outView: elemsOutView,
viewStatusList: viewStatusList
};
};
ScrollSpy.prototype.isInView = function (el) {
var winH = this.winH,
scrollTop = this.doc.documentElement.scrollTop || this.doc.body.scrollTop,
scrollBottom = scrollTop + winH,
rect = el.getBoundingClientRect(),
elTop = rect.top + scrollTop,
elBottom = elTop + el.offsetHeight;
return (elTop < scrollBottom) && (elBottom > scrollTop);
};
ScrollSpy.prototype.markNav = function (elems) {
var navItems = this.nav,
isAlreadyMarked = false;
for (var i = 0, max = navItems.length; i < max; i++) {
if (elems.viewStatusList[i] && !isAlreadyMarked) {
isAlreadyMarked = true;
navItems[i].classList.add(this.className);
} else {
navItems[i].classList.remove(this.className);
}
}
};
module.exports = ScrollSpy;
},{}],2:[function(require,module,exports){
(function (global){
/**
* ScrollSpy
*
*/
var ScrollSpy = require('./modules/scrollspy');
global.ScrollSpy = module.exports = ScrollSpy;
}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./modules/scrollspy":1}]},{},[2]);