127 lines
4.8 KiB
JavaScript
Vendored
127 lines
4.8 KiB
JavaScript
Vendored
/*
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GreedyNav.js - http://lukejacksonn.com/actuate
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Licensed under the MIT license - http://opensource.org/licenses/MIT
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Copyright (c) 2015 Luke Jackson
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*/
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$(function() {
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var $btn = $("nav.greedy-nav .greedy-nav__toggle");
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var $vlinks = $("nav.greedy-nav .visible-links");
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var $hlinks = $("nav.greedy-nav .hidden-links");
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var $nav = $("nav.greedy-nav");
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var $logo = $('nav.greedy-nav .site-logo');
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var $logoImg = $('nav.greedy-nav .site-logo img');
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var $title = $("nav.greedy-nav .site-title");
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var $search = $('nav.greedy-nav button.search__toggle');
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var numOfItems, totalSpace, closingTime, breakWidths;
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// This function measures both hidden and visible links and sets the navbar breakpoints
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// This is called the first time the script runs and everytime the "check()" function detects a change of window width that reached a different CSS width breakpoint, which affects the size of navbar Items
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// Please note that "CSS width breakpoints" (which are only 4) !== "navbar breakpoints" (which are as many as the number of items on the navbar)
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function measureLinks(){
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numOfItems = 0;
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totalSpace = 0;
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closingTime = 1000;
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breakWidths = [];
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// Adds the width of a navItem in order to create breakpoints for the navbar
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function addWidth(i, w) {
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totalSpace += w;
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numOfItems += 1;
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breakWidths.push(totalSpace);
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}
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// Measures the width of hidden links by making a temporary clone of them and positioning under visible links
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function hiddenWidth(obj){
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var clone = obj.clone();
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clone.css("visibility","hidden");
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$vlinks.append(clone);
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addWidth(0, clone.outerWidth());
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clone.remove();
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}
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// Measure both visible and hidden links widths
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$vlinks.children().outerWidth(addWidth);
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$hlinks.children().each(function(){hiddenWidth($(this))});
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}
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// Get initial state
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measureLinks();
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var winWidth = $( window ).width();
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// Set the last measured CSS width breakpoint: 0: <768px, 1: <1024px, 2: < 1280px, 3: >= 1280px.
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var lastBreakpoint = winWidth < 768 ? 0 : winWidth < 1024 ? 1 : winWidth < 1280 ? 2 : 3;
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var availableSpace, numOfVisibleItems, requiredSpace, timer;
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function check() {
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winWidth = $( window ).width();
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// Set the current CSS width breakpoint: 0: <768px, 1: <1024px, 2: < 1280px, 3: >= 1280px.
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var curBreakpoint = winWidth < 768 ? 0 : winWidth < 1024 ? 1 : winWidth < 1280 ? 2 : 3;
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// If current breakpoint is different from last measured breakpoint, measureLinks again
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if(curBreakpoint !== lastBreakpoint) measureLinks();
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// Set the last measured CSS width breakpoint with the current breakpoint
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lastBreakpoint = curBreakpoint;
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// Get instant state
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numOfVisibleItems = $vlinks.children().length;
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// Decrease the width of visible elements from the nav innerWidth to find out the available space for navItems
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availableSpace = /* nav */ $nav.innerWidth()
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- /* logo */ ($logo.length !== 0 ? $logo.outerWidth(true) : 0)
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- /* title */ $title.outerWidth(true)
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- /* search */ ($search.length !== 0 ? $search.outerWidth(true) : 0)
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- /* toggle */ (numOfVisibleItems !== breakWidths.length ? $btn.outerWidth(true) : 0);
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requiredSpace = breakWidths[numOfVisibleItems - 1];
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// There is not enought space
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if (requiredSpace > availableSpace) {
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$vlinks.children().last().prependTo($hlinks);
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numOfVisibleItems -= 1;
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check();
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// There is more than enough space. If only one element is hidden, add the toggle width to the available space
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} else if (availableSpace + (numOfVisibleItems === breakWidths.length - 1?$btn.outerWidth(true):0) > breakWidths[numOfVisibleItems]) {
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$hlinks.children().first().appendTo($vlinks);
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numOfVisibleItems += 1;
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check();
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}
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// Update the button accordingly
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$btn.attr("count", numOfItems - numOfVisibleItems);
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if (numOfVisibleItems === numOfItems) {
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$btn.addClass('hidden');
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} else $btn.removeClass('hidden');
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}
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// Window listeners
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$(window).resize(function() {
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check();
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});
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$btn.on('click', function() {
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$hlinks.toggleClass('hidden');
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$(this).toggleClass('close');
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clearTimeout(timer);
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});
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$hlinks.on('mouseleave', function() {
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// Mouse has left, start the timer
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timer = setTimeout(function() {
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$hlinks.addClass('hidden');
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}, closingTime);
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}).on('mouseenter', function() {
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// Mouse is back, cancel the timer
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clearTimeout(timer);
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})
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// check if page has a logo
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if($logoImg.length !== 0){
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// check if logo is not loaded
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if(!($logoImg[0].complete || $logoImg[0].naturalWidth !== 0)){
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// if logo is not loaded wait for logo to load or fail to check
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$logoImg.one("load error", check);
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// if logo is already loaded just check
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} else check();
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// if page does not have a logo just check
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} else check();
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});
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