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foundation.magellan.js
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foundation.magellan.js
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/*jslint unparam: true, browser: true, indent: 2 */
;(function ($, window, document, undefined) {
'use strict';
Foundation.libs.magellan = {
name : 'magellan',
version : '4.2.0',
settings : {
activeClass: 'active'
},
init : function (scope, method, options) {
this.scope = scope || this.scope;
Foundation.inherit(this, 'data_options');
if (typeof method === 'object') {
$.extend(true, this.settings, method);
}
if (typeof method != 'string') {
if (!this.settings.init) {
this.fixed_magellan = $("[data-magellan-expedition]");
this.set_threshold();
this.last_destination = $('[data-magellan-destination]').last();
this.events();
}
return this.settings.init;
} else {
return this[method].call(this, options);
}
},
events : function () {
var self = this;
$(this.scope).on('arrival.fndtn.magellan', '[data-magellan-arrival]', function (e) {
var $destination = $(this),
$expedition = $destination.closest('[data-magellan-expedition]'),
activeClass = $expedition.attr('data-magellan-active-class')
|| self.settings.activeClass;
$destination
.closest('[data-magellan-expedition]')
.find('[data-magellan-arrival]')
.not($destination)
.removeClass(activeClass);
$destination.addClass(activeClass);
});
this.fixed_magellan
.on('update-position.fndtn.magellan', function(){
var $el = $(this);
// $el.data("magellan-fixed-position","");
// $el.data("magellan-top-offset", "");
})
.trigger('update-position');
$(window)
.on('resize.fndtn.magellan', function() {
this.fixed_magellan.trigger('update-position');
}.bind(this))
.on('scroll.fndtn.magellan', function() {
var windowScrollTop = $(window).scrollTop();
self.fixed_magellan.each(function() {
var $expedition = $(this);
if (typeof $expedition.data('magellan-top-offset') === 'undefined') {
$expedition.data('magellan-top-offset', $expedition.offset().top);
}
if (typeof $expedition.data('magellan-fixed-position') === 'undefined') {
$expedition.data('magellan-fixed-position', false)
}
var fixed_position = (windowScrollTop + self.settings.threshold) > $expedition.data("magellan-top-offset");
var attr = $expedition.attr('data-magellan-top-offset');
if ($expedition.data("magellan-fixed-position") != fixed_position) {
$expedition.data("magellan-fixed-position", fixed_position);
if (fixed_position) {
$expedition.css({position:"fixed", top:0});
} else {
$expedition.css({position:"", top:""});
}
if (fixed_position && typeof attr != 'undefined' && attr != false) {
$expedition.css({position:"fixed", top:attr + "px"});
}
}
});
});
if (this.last_destination.length > 0) {
$(window).on('scroll.fndtn.magellan', function (e) {
var windowScrollTop = $(window).scrollTop(),
scrolltopPlusHeight = windowScrollTop + $(window).height(),
lastDestinationTop = Math.ceil(self.last_destination.offset().top);
$('[data-magellan-destination]').each(function () {
var $destination = $(this),
destination_name = $destination.attr('data-magellan-destination'),
topOffset = $destination.offset().top - windowScrollTop;
if (topOffset <= self.settings.threshold) {
$("[data-magellan-arrival='" + destination_name + "']").trigger('arrival');
}
// In large screens we may hit the bottom of the page and dont reach the top of the last magellan-destination, so lets force it
if (scrolltopPlusHeight >= $(self.scope).height() && lastDestinationTop > windowScrollTop && lastDestinationTop < scrolltopPlusHeight) {
$('[data-magellan-arrival]').last().trigger('arrival');
}
});
});
}
this.settings.init = true;
},
set_threshold : function () {
if (!this.settings.threshold) {
this.settings.threshold = (this.fixed_magellan.length > 0) ?
this.outerHeight(this.fixed_magellan, true) : 0;
}
},
off : function () {
$(this.scope).off('.fndtn.magellan');
},
reflow : function () {}
};
}(Foundation.zj, this, this.document));

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