/**
* Extend jquery with a scrollspy plugin.
* This watches the window scroll and fires events when elements are scrolled into viewport.
*
* throttle() and getTime() taken from Underscore.js
* https://github.com/jashkenas/underscore
*
* @author Copyright 2013 John Smart
* @license https://raw.github.com/thesmart/jquery-scrollspy/master/LICENSE
* @see https://github.com/thesmart
* @version 0.1.2
*/
(function($) {
var jWindow = $(window);
var elements = [];
var elementsInView = [];
var isSpying = false;
var ticks = 0;
var offset = {
top : 0,
right : 0,
bottom : 0,
left : 0,
}
/**
* Find elements that are within the boundary
* @param {number} top
* @param {number} right
* @param {number} bottom
* @param {number} left
* @return {jQuery} A collection of elements
*/
function findElements(top, right, bottom, left) {
var hits = $();
$.each(elements, function(i, element) {
var elTop = element.offset().top,
elLeft = element.offset().left,
elRight = elLeft + element.width(),
elBottom = elTop + element.height();
var isIntersect = !(elLeft > right ||
elRight < left ||
elTop > bottom ||
elBottom < top);
if (isIntersect) {
hits.push(element);
}
});
return hits;
}
/**
* Called when the user scrolls the window
*/
function onScroll() {
// unique tick id
++ticks;
// viewport rectangle
var top = jWindow.scrollTop(),
left = jWindow.scrollLeft(),
right = left + jWindow.width(),
bottom = top + jWindow.height();
// determine which elements are in view
var intersections = findElements(top+offset.top, right+offset.right, bottom+offset.bottom, left+offset.left);
$.each(intersections, function(i, element) {
var lastTick = element.data('scrollSpy:ticks');
if (typeof lastTick != 'number') {
// entered into view
element.triggerHandler('scrollSpy:enter');
}
// update tick id
element.data('scrollSpy:ticks', ticks);
});
// determine which elements are no longer in view
$.each(elementsInView, function(i, element) {
var lastTick = element.data('scrollSpy:ticks');
if (typeof lastTick == 'number' && lastTick !== ticks) {
// exited from view
element.triggerHandler('scrollSpy:exit');
element.data('scrollSpy:ticks', null);
}
});
// remember elements in view for next tick
elementsInView = intersections;
}
/**
* Called when window is resized
*/
function onWinSize() {
jWindow.trigger('scrollSpy:winSize');
}
/**
* Get time in ms
* @license https://raw.github.com/jashkenas/underscore/master/LICENSE
* @type {function}
* @return {number}
*/
var getTime = (Date.now || function () {
return new Date().getTime();
});
/**
* Returns a function, that, when invoked, will only be triggered at most once
* during a given window of time. Normally, the throttled function will run
* as much as it can, without ever going more than once per `wait` duration;
* but if you'd like to disable the execution on the leading edge, pass
* `{leading: false}`. To disable execution on the trailing edge, ditto.
* @license https://raw.github.com/jashkenas/underscore/master/LICENSE
* @param {function} func
* @param {number} wait
* @param {Object=} options
* @returns {Function}
*/
function throttle(func, wait, options) {
var context, args, result;
var timeout = null;
var previous = 0;
options || (options = {});
var later = function () {
previous = options.leading === false ? 0 : getTime();
timeout = null;
result = func.apply(context, args);
context = args = null;
};
return function () {
var now = getTime();
if (!previous && options.leading === false) previous = now;
var remaining = wait - (now - previous);
context = this;
args = arguments;
if (remaining <= 0) {
clearTimeout(timeout);
timeout = null;
previous = now;
result = func.apply(context, args);
context = args = null;
} else if (!timeout && options.trailing !== false) {
timeout = setTimeout(later, remaining);
}
return result;
};
};
/**
* Enables ScrollSpy using a selector
* @param {jQuery|string} selector The elements collection, or a selector
* @param {Object=} options Optional.
throttle : number -> scrollspy throttling. Default: 100 ms
offsetTop : number -> offset from top. Default: 0
offsetRight : number -> offset from right. Default: 0
offsetBottom : number -> offset from bottom. Default: 0
offsetLeft : number -> offset from left. Default: 0
* @returns {jQuery}
*/
$.scrollSpy = function(selector, options) {
selector = $(selector);
selector.each(function(i, element) {
elements.push($(element));
});
options = options || {
throttle: 100
};
offset.top = options.offsetTop || 0;
offset.right = options.offsetRight || 0;
offset.bottom = options.offsetBottom || 0;
offset.left = options.offsetLeft || 0;
var throttledScroll = throttle(onScroll, options.throttle || 100);
var readyScroll = function(){
$(document).ready(throttledScroll);
};
if (!isSpying) {
jWindow.on('scroll', readyScroll);
jWindow.on('resize', readyScroll);
isSpying = true;
}
// perform a scan once, after current execution context, and after dom is ready
setTimeout(readyScroll, 0);
return selector;
};
/**
* Listen for window resize events
* @param {Object=} options Optional. Set { throttle: number } to change throttling. Default: 100 ms
* @returns {jQuery} $(window)
*/
$.winSizeSpy = function(options) {
$.winSizeSpy = function() { return jWindow; }; // lock from multiple calls
options = options || {
throttle: 100
};
return jWindow.on('resize', throttle(onWinSize, options.throttle || 100));
};
/**
* Enables ScrollSpy on a collection of elements
* e.g. $('.scrollSpy').scrollSpy()
* @param {Object=} options Optional.
throttle : number -> scrollspy throttling. Default: 100 ms
offsetTop : number -> offset from top. Default: 0
offsetRight : number -> offset from right. Default: 0
offsetBottom : number -> offset from bottom. Default: 0
offsetLeft : number -> offset from left. Default: 0
* @returns {jQuery}
*/
$.fn.scrollSpy = function(options) {
return $.scrollSpy($(this), options);
};
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