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/*!
* NavScroll.js
* Version: 1.4.1
* Author: Jeroen Hammann
*
* Copyright (c) 2014 Jeroen Hammann
* Released under the MIT license
*/
;(function ($, window, document, undefined) {
'use strict';
var pluginName = 'navScroll',
defaults = {
// The time it takes to scroll to the element (set this to 0 so it obviously won't show an animation).
scrollTime: 500,
// The class of the items which invokes the scroll animation. All anchor tags inside the element are clickable when the value is empty.
navItemClassName: '',
// Set the height of the navigation (to use as offset). 'auto' let's the plugin determine the height automatically, a number determines the height in px.
navHeight: 'auto',
// If your navigation hides and is used as a dropdown on small screens setting this to true hides the dropdown after a click.
mobileDropdown: false,
// Additionaly you can insert the mobile nav's classname here, when left empty the plugin searches for a <ul> in the same parent element.
mobileDropdownClassName: '',
// The window width, which functions as a breakpoint between desktop and mobile.
mobileBreakpoint: 1024,
// Set to 'true' if you want to enable scrollspy.
scrollSpy: false,
// Set to true if you want the parent of the anchor to have an active class instead of the anchor itself (only if ScrollSpy is enabled).
activeParent: false,
// Set the name of the active class. When left blank the class name will be 'active'.
activeClassName: 'active'
};
function NavScroll(element, options) {
this.element = element;
this.options = $.extend({
onScrollStart: function() {},
onScrollEnd: function() {}
}, defaults, options);
this._defaults = defaults;
this._name = pluginName;
this.init();
}
NavScroll.prototype = {
init: function() {
var self, options, element, navItem, navOffset, scrollTime;
self = this;
options = self.options;
element = self.element;
if (options.navItemClassName === '') {
navItem = $(element).find('a');
} else {
navItem = $(element).find('.' + options.navItemClassName);
}
if (options.navHeight === 'auto') {
navOffset = $(element).height();
} else if (isNaN(options.navHeight)) {
throw new Error ('\'navHeight\' only accepts \'auto\' or a number as value.');
} else {
navOffset = options.navHeight;
}
navItem.on('click', function(e){
var url, parts, target, targetOffset, targetTop;
url = this.href;
parts = url.split('#');
target = parts[1];
if (target !== undefined) {
e.preventDefault();
targetOffset = $('#' + target).offset();
targetTop = targetOffset.top;
}
if ($(this).data('scrolltime') !== undefined) {
scrollTime = $(this).data('scrolltime');
} else {
scrollTime = options.scrollTime;
}
if (options.mobileDropdown && $(window).width() >= 0 && $(window).width() <= options.mobileBreakpoint) {
if (options.mobileDropdownClassName === '') {
$(element).find('ul').slideUp('fast');
} else {
$('.' + options.mobileDropdownClassName).slideUp('fast');
}
}
$('html, body').stop().animate({
scrollTop: targetTop - navOffset
}, scrollTime).promise().done(function() {
options.onScrollEnd.call(this);
});
options.onScrollStart.call(this);
});
if (options.scrollSpy) {
var scrollItems;
scrollItems = [];
navItem.each(function() {
var scrollItemId = $(this).attr('href');
if (scrollItemId.charAt(0) === '#') {
scrollItems.push($(scrollItemId));
}
});
$(window).on('scroll', function () {
self.scrollspy(options, navItem, scrollItems);
});
self.scrollspy(options, navItem, scrollItems);
}
},
scrollspy: function(options, navItem, scrollItems) {
var scrollPos, changeBounds, i, l;
scrollPos = (document.documentElement && document.documentElement.scrollTop) || document.body.scrollTop;
changeBounds = window.innerHeight / 3 || document.documentElement.clientHeight / 3;
l = navItem.length;
for (i = 0; l > i; i++) {
var item = scrollItems[i];
if (item !== undefined) {
if (scrollPos > (item.offset().top - changeBounds)) {
if (options.activeParent) {
navItem.parent().removeClass(options.activeClassName);
$(navItem[i]).parent().addClass(options.activeClassName);
} else {
navItem.removeClass(options.activeClassName);
$(navItem[i]).addClass(options.activeClassName);
}
}
}
}
}
};
$.fn[pluginName] = function (options) {
return this.each(function () {
if (!$.data(this, 'plugin_' + pluginName)) {
$.data(this, 'plugin_' + pluginName,
new NavScroll(this, options));
}
});
};
})(jQuery, window, document);
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