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;(function ($, window, document, undefined) {
'use strict';
Foundation.libs['magellan-expedition'] = {
name : 'magellan-expedition',
version : '5.4.3',
settings : {
active_class: 'active',
threshold: 0, // pixels from the top of the expedition for it to become fixes
destination_threshold: 20, // pixels from the top of destination for it to be considered active
throttle_delay: 30, // calculation throttling to increase framerate
fixed_top: 0 // top distance in pixels assigend to the fixed element on scroll
},
init : function (scope, method, options) {
Foundation.inherit(this, 'throttle');
this.bindings(method, options);
},
events : function () {
var self = this,
S = self.S,
settings = self.settings;
// initialize expedition offset
self.set_expedition_position();
S(self.scope)
.off('.magellan')
.on('click.fndtn.magellan', '[' + self.add_namespace('data-magellan-arrival') + '] a[href^="#"]', function (e) {
e.preventDefault();
var expedition = $(this).closest('[' + self.attr_name() + ']'),
settings = expedition.data('magellan-expedition-init'),
hash = this.hash.split('#').join(''),
target = $("a[name='"+hash+"']");
if (target.length === 0) {
target = $('#'+hash);
}
// Account for expedition height if fixed position
var scroll_top = target.offset().top - settings.destination_threshold + 1;
scroll_top = scroll_top - expedition.outerHeight();
$('html, body').stop().animate({
'scrollTop': scroll_top
}, 700, 'swing', function () {
if(history.pushState) {
history.pushState(null, null, '#'+hash);
}
else {
location.hash = '#'+hash;
}
});
})
.on('scroll.fndtn.magellan', self.throttle(this.check_for_arrivals.bind(this), settings.throttle_delay));
$(window)
.on('resize.fndtn.magellan', self.throttle(this.set_expedition_position.bind(this), settings.throttle_delay));
},
check_for_arrivals : function() {
var self = this;
self.update_arrivals();
self.update_expedition_positions();
},
set_expedition_position : function() {
var self = this;
$('[' + this.attr_name() + '=fixed]', self.scope).each(function(idx, el) {
var expedition = $(this),
settings = expedition.data('magellan-expedition-init'),
styles = expedition.attr('styles'), // save styles
top_offset, fixed_top;
expedition.attr('style', '');
top_offset = expedition.offset().top + settings.threshold;
//set fixed-top by attribute
fixed_top = parseInt(expedition.data('magellan-fixed-top'));
if(!isNaN(fixed_top))
self.settings.fixed_top = fixed_top;
expedition.data(self.data_attr('magellan-top-offset'), top_offset);
expedition.attr('style', styles);
});
},
update_expedition_positions : function() {
var self = this,
window_top_offset = $(window).scrollTop();
$('[' + this.attr_name() + '=fixed]', self.scope).each(function() {
var expedition = $(this),
settings = expedition.data('magellan-expedition-init'),
styles = expedition.attr('style'), // save styles
top_offset = expedition.data('magellan-top-offset');
//scroll to the top distance
if (window_top_offset+self.settings.fixed_top >= top_offset) {
// Placeholder allows height calculations to be consistent even when
// appearing to switch between fixed/non-fixed placement
var placeholder = expedition.prev('[' + self.add_namespace('data-magellan-expedition-clone') + ']');
if (placeholder.length === 0) {
placeholder = expedition.clone();
placeholder.removeAttr(self.attr_name());
placeholder.attr(self.add_namespace('data-magellan-expedition-clone'),'');
expedition.before(placeholder);
}
expedition.css({position:'fixed', top: settings.fixed_top}).addClass('fixed');
} else {
expedition.prev('[' + self.add_namespace('data-magellan-expedition-clone') + ']').remove();
expedition.attr('style',styles).css('position','').css('top','').removeClass('fixed');
}
});
},
update_arrivals : function() {
var self = this,
window_top_offset = $(window).scrollTop();
$('[' + this.attr_name() + ']', self.scope).each(function() {
var expedition = $(this),
settings = expedition.data(self.attr_name(true) + '-init'),
offsets = self.offsets(expedition, window_top_offset),
arrivals = expedition.find('[' + self.add_namespace('data-magellan-arrival') + ']'),
active_item = false;
offsets.each(function(idx, item) {
if (item.viewport_offset >= item.top_offset) {
var arrivals = expedition.find('[' + self.add_namespace('data-magellan-arrival') + ']');
arrivals.not(item.arrival).removeClass(settings.active_class);
item.arrival.addClass(settings.active_class);
active_item = true;
return true;
}
});
if (!active_item) arrivals.removeClass(settings.active_class);
});
},
offsets : function(expedition, window_offset) {
var self = this,
settings = expedition.data(self.attr_name(true) + '-init'),
viewport_offset = window_offset;
return expedition.find('[' + self.add_namespace('data-magellan-arrival') + ']').map(function(idx, el) {
var name = $(this).data(self.data_attr('magellan-arrival')),
dest = $('[' + self.add_namespace('data-magellan-destination') + '=' + name + ']');
if (dest.length > 0) {
var top_offset = Math.floor(dest.offset().top - settings.destination_threshold - expedition.outerHeight());
return {
destination : dest,
arrival : $(this),
top_offset : top_offset,
viewport_offset : viewport_offset
}
}
}).sort(function(a, b) {
if (a.top_offset < b.top_offset) return -1;
if (a.top_offset > b.top_offset) return 1;
return 0;
});
},
data_attr: function (str) {
if (this.namespace.length > 0) {
return this.namespace + '-' + str;
}
return str;
},
off : function () {
this.S(this.scope).off('.magellan');
this.S(window).off('.magellan');
},
reflow : function () {
var self = this;
// remove placeholder expeditions used for height calculation purposes
$('[' + self.add_namespace('data-magellan-expedition-clone') + ']', self.scope).remove();
}
};
}(jQuery, window, window.document));
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