TanchoToplineCargo/public/sunsarioverseas/js/lib/navigation.scrollspy.js

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JavaScript
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2024-05-05 04:47:49 +00:00

;(function ($, window, document, undefined) {
// Add our plugin to fn
$.fn.extend({
// Scrollspy is the name of the plugin
scrollspy: function (options) {
// Define our defaults
var defaults = {
namespace: 'scrollspy',
activeClass: 'active',
scrollSpeed: 500,
offset: 0,
container: window,
onChange: function(){},
onExit: function(){}
};
// Add any overriden options to a new object
options = $.extend({}, defaults, options);
// Adds two numbers together
var add = function (ex1, ex2) {
return parseInt(ex1, 10) + parseInt(ex2, 10);
}
// Find our elements
var findElements = function (links) {
// Declare our array
var elements = [];
// Loop through the links
for (var i = 0; i < links.length; i++) {
// Get our current link
var link = links[i];
// Get our hash
var hash = $(link).attr("href");
// Store our hash as an element
var element = $(hash);
// If we have an element matching the hash
if (element.length > 0) {
// Get our offset
var top = Math.floor(element.offset().top),
bottom = top + Math.floor(element.outerHeight());
// Add to our array
elements.push({ element: element, hash: hash, top: top, bottom: bottom });
}
}
// Return our elements
return elements;
};
// Find our link from a hash
var findLink = function (links, hash) {
// For each link
for (var i = 0; i < links.length; i++) {
// Get our current link
var link = $(links[i]);
// If our hash matches the link href
if (link.attr("href") === hash) {
// Return the link
return link;
}
}
};
// Reset classes on our elements
var resetClasses = function (links) {
// For each link
for (var i = 0; i < links.length; i++) {
// Get our current link
var link = $(links[i]);
// Remove the active class
link.parent().removeClass(options.activeClass);
}
};
// For each scrollspy instance
return this.each(function () {
// Declare our global variables
var element = this,
container = $(options.container);
// Get our objects
var links = $(element).find(".nav-menu").find('[href*="#"]');
// Loop through our links
for (var i = 0; i < links.length; i++) {
// Get our current link
var link = links[i];
// Bind the click event
$(link).on("click", function (e) {
// Get our target
var target = $(this).attr("href"),
$target = $(target);
// If we have the element
if ($target.length > 0) {
// Get it's scroll position
var top = add($target.offset().top, options.offset);
// Scroll to our position
$('html, body').animate({ scrollTop: top }, options.scrollSpeed);
// Prevent our link
e.preventDefault();
}
});
}
// Get our elements
var elements = findElements(links);
$(window).resize(function() {
elements = findElements(links);
});
// Add a listener to the window
container.on('scroll.' + options.namespace, function () {
// Get the position and store in an object
var position = {
top: add($(this).scrollTop(), Math.abs(options.offset)),
left: $(this).scrollLeft()
};
// Create a variable for our link
var link;
// Loop through our elements
for (var i = 0; i < elements.length; i++) {
// Get our current item
var current = elements[i];
// If we are within the boundries of our element
if (position.top >= current.top && position.top < current.bottom) {
// get our element
var hash = current.hash;
// Get the link
link = findLink(links, hash);
// If we have a link
if (link) {
// If we have an onChange function
if (options.onChange) {
// Fire our onChange function
options.onChange(current.element, $(element), position);
}
// Reset the classes on all other link
resetClasses(links);
// Add our active link to our parent
link.parent().addClass(options.activeClass);
// break our loop
break;
}
}
}
// If we don't have a link and we have a exit function
if (!link && options.onExit) {
// Fire our onChange function
options.onExit($(element), position);
}
});
});
}
});
})(jQuery, window, document, undefined);