sp-codes.de/bower_components/foundation-sites/js/foundation.magellan.js
2016-10-28 19:33:25 +02:00

223 lines
6 KiB
JavaScript

'use strict';
!function($) {
/**
* Magellan module.
* @module foundation.magellan
*/
class Magellan {
/**
* Creates a new instance of Magellan.
* @class
* @fires Magellan#init
* @param {Object} element - jQuery object to add the trigger to.
* @param {Object} options - Overrides to the default plugin settings.
*/
constructor(element, options) {
this.$element = element;
this.options = $.extend({}, Magellan.defaults, this.$element.data(), options);
this._init();
Foundation.registerPlugin(this, 'Magellan');
}
/**
* Initializes the Magellan plugin and calls functions to get equalizer functioning on load.
* @private
*/
_init() {
var id = this.$element[0].id || Foundation.GetYoDigits(6, 'magellan');
var _this = this;
this.$targets = $('[data-magellan-target]');
this.$links = this.$element.find('a');
this.$element.attr({
'data-resize': id,
'data-scroll': id,
'id': id
});
this.$active = $();
this.scrollPos = parseInt(window.pageYOffset, 10);
this._events();
}
/**
* Calculates an array of pixel values that are the demarcation lines between locations on the page.
* Can be invoked if new elements are added or the size of a location changes.
* @function
*/
calcPoints() {
var _this = this,
body = document.body,
html = document.documentElement;
this.points = [];
this.winHeight = Math.round(Math.max(window.innerHeight, html.clientHeight));
this.docHeight = Math.round(Math.max(body.scrollHeight, body.offsetHeight, html.clientHeight, html.scrollHeight, html.offsetHeight));
this.$targets.each(function(){
var $tar = $(this),
pt = Math.round($tar.offset().top - _this.options.threshold);
$tar.targetPoint = pt;
_this.points.push(pt);
});
}
/**
* Initializes events for Magellan.
* @private
*/
_events() {
var _this = this,
$body = $('html, body'),
opts = {
duration: _this.options.animationDuration,
easing: _this.options.animationEasing
};
$(window).one('load', function(){
if(_this.options.deepLinking){
if(location.hash){
_this.scrollToLoc(location.hash);
}
}
_this.calcPoints();
_this._updateActive();
});
this.$element.on({
'resizeme.zf.trigger': this.reflow.bind(this),
'scrollme.zf.trigger': this._updateActive.bind(this)
}).on('click.zf.magellan', 'a[href^="#"]', function(e) {
e.preventDefault();
var arrival = this.getAttribute('href');
_this.scrollToLoc(arrival);
});
}
/**
* Function to scroll to a given location on the page.
* @param {String} loc - a properly formatted jQuery id selector. Example: '#foo'
* @function
*/
scrollToLoc(loc) {
var scrollPos = Math.round($(loc).offset().top - this.options.threshold / 2 - this.options.barOffset);
$('html, body').stop(true).animate({ scrollTop: scrollPos }, this.options.animationDuration, this.options.animationEasing);
}
/**
* Calls necessary functions to update Magellan upon DOM change
* @function
*/
reflow() {
this.calcPoints();
this._updateActive();
}
/**
* Updates the visibility of an active location link, and updates the url hash for the page, if deepLinking enabled.
* @private
* @function
* @fires Magellan#update
*/
_updateActive(/*evt, elem, scrollPos*/) {
var winPos = /*scrollPos ||*/ parseInt(window.pageYOffset, 10),
curIdx;
if(winPos + this.winHeight === this.docHeight){ curIdx = this.points.length - 1; }
else if(winPos < this.points[0]){ curIdx = 0; }
else{
var isDown = this.scrollPos < winPos,
_this = this,
curVisible = this.points.filter(function(p, i){
return isDown ? p - _this.options.barOffset <= winPos : p - _this.options.barOffset - _this.options.threshold <= winPos;
});
curIdx = curVisible.length ? curVisible.length - 1 : 0;
}
this.$active.removeClass(this.options.activeClass);
this.$active = this.$links.eq(curIdx).addClass(this.options.activeClass);
if(this.options.deepLinking){
var hash = this.$active[0].getAttribute('href');
if(window.history.pushState){
window.history.pushState(null, null, hash);
}else{
window.location.hash = hash;
}
}
this.scrollPos = winPos;
/**
* Fires when magellan is finished updating to the new active element.
* @event Magellan#update
*/
this.$element.trigger('update.zf.magellan', [this.$active]);
}
/**
* Destroys an instance of Magellan and resets the url of the window.
* @function
*/
destroy() {
this.$element.off('.zf.trigger .zf.magellan')
.find(`.${this.options.activeClass}`).removeClass(this.options.activeClass);
if(this.options.deepLinking){
var hash = this.$active[0].getAttribute('href');
window.location.hash.replace(hash, '');
}
Foundation.unregisterPlugin(this);
}
}
/**
* Default settings for plugin
*/
Magellan.defaults = {
/**
* Amount of time, in ms, the animated scrolling should take between locations.
* @option
* @example 500
*/
animationDuration: 500,
/**
* Animation style to use when scrolling between locations.
* @option
* @example 'ease-in-out'
*/
animationEasing: 'linear',
/**
* Number of pixels to use as a marker for location changes.
* @option
* @example 50
*/
threshold: 50,
/**
* Class applied to the active locations link on the magellan container.
* @option
* @example 'active'
*/
activeClass: 'active',
/**
* Allows the script to manipulate the url of the current page, and if supported, alter the history.
* @option
* @example true
*/
deepLinking: false,
/**
* Number of pixels to offset the scroll of the page on item click if using a sticky nav bar.
* @option
* @example 25
*/
barOffset: 0
}
// Window exports
Foundation.plugin(Magellan, 'Magellan');
}(jQuery);