1/*! 2 * Theia Sticky Sidebar v1.4.0 3 * https://github.com/WeCodePixels/theia-sticky-sidebar 4 * 5 * Glues your website's sidebars, making them permanently visible while scrolling. 6 * 7 * Copyright 2013-2016 WeCodePixels and other contributors 8 * Released under the MIT license 9 */ 10 11(function ($) { 12 $.fn.theiaStickySidebar = function (options) { 13 var defaults = { 14 'containerSelector': '', 15 'additionalMarginTop': 0, 16 'additionalMarginBottom': 0, 17 'updateSidebarHeight': true, 18 'minWidth': 0, 19 'disableOnResponsiveLayouts': true, 20 'sidebarBehavior': 'modern' 21 }; 22 options = $.extend(defaults, options); 23 24 // Validate options 25 options.additionalMarginTop = parseInt(options.additionalMarginTop) || 0; 26 options.additionalMarginBottom = parseInt(options.additionalMarginBottom) || 0; 27 28 tryInitOrHookIntoEvents(options, this); 29 30 // Try doing init, otherwise hook into window.resize and document.scroll and try again then. 31 function tryInitOrHookIntoEvents(options, $that) { 32 var success = tryInit(options, $that); 33 34 if (!success) { 35 console.log('TST: Body width smaller than options.minWidth. Init is delayed.'); 36 37 $(document).scroll(function (options, $that) { 38 return function (evt) { 39 var success = tryInit(options, $that); 40 41 if (success) { 42 $(this).unbind(evt); 43 } 44 }; 45 }(options, $that)); 46 $(window).resize(function (options, $that) { 47 return function (evt) { 48 var success = tryInit(options, $that); 49 50 if (success) { 51 $(this).unbind(evt); 52 } 53 }; 54 }(options, $that)) 55 } 56 } 57 58 // Try doing init if proper conditions are met. 59 function tryInit(options, $that) { 60 if (options.initialized === true) { 61 return true; 62 } 63 64 if ($('body').width() < options.minWidth) { 65 return false; 66 } 67 68 init(options, $that); 69 70 return true; 71 } 72 73 // Init the sticky sidebar(s). 74 function init(options, $that) { 75 options.initialized = true; 76 77 // Add CSS 78 $('head').append($('<style>.theiaStickySidebar:after {content: ""; display: table; clear: both;}</style>')); 79 80 $that.each(function () { 81 var o = {}; 82 83 o.sidebar = $(this); 84 85 // Save options 86 o.options = options || {}; 87 88 // Get container 89 o.container = $(o.options.containerSelector); 90 if (o.container.size() == 0) { 91 o.container = o.sidebar.parent(); 92 } 93 94 // Create sticky sidebar 95 o.sidebar.parents().css('-webkit-transform', 'none'); // Fix for WebKit bug - https://code.google.com/p/chromium/issues/detail?id=20574 96 o.sidebar.css({ 97 'position': 'relative', 98 'overflow': 'visible', 99 // The "box-sizing" must be set to "content-box" because we set a fixed height to this element when the sticky
99sidebar has a fixed position. 100 '-webkit-box-sizing': 'border-box', 101 '-moz-box-sizing': 'border-box', 102 'box-sizing': 'border-box' 103 }); 104 105 // Get the sticky sidebar element. If none has been found, then create one. 106 o.stickySidebar = o.sidebar.find('.theiaStickySidebar'); 107 if (o.stickySidebar.length == 0) { 108 o.sidebar.find('script').remove(); // Remove <script> tags, otherwise they will be run again on the next line. 109 o.stickySidebar = $('<div>').addClass('theiaStickySidebar').append(o.sidebar.children()); 110 o.sidebar.append(o.stickySidebar); 111 } 112 113 // Get existing top and bottom margins and paddings 114 o.marginTop = parseInt(o.sidebar.css('margin-top')); 115 o.marginBottom = parseInt(o.sidebar.css('margin-bottom')); 116 o.paddingTop = parseInt(o.sidebar.css('padding-top')); 117 o.paddingBottom = parseInt(o.sidebar.css('padding-bottom')); 118
119 // Add a temporary padding rule to check for collapsable margins. 120 var collapsedTopHeight = o.stickySidebar.offset().top; 121 var collapsedBottomHeight = o.stickySidebar.outerHeight(); 122 o.stickySidebar.css('padding-top', 1); 123 o.stickySidebar.css('padding-bottom', 1); 124 collapsedTopHeight -= o.stickySidebar.offset().top; 125 collapsedBottomHeight = o.stickySidebar.outerHeight() - collapsedBottomHeight - collapsedTopHeight; 126 if (collapsedTopHeight == 0) { 127 o.stickySidebar.css('padding-top', 0); 128 o.stickySidebarPaddingTop = 0; 129 } 130 else { 131 o.stickySidebarPaddingTop = 1; 132 } 133 134 if (collapsedBottomHeight == 0) { 135 o.stickySidebar.css('padding-bottom', 0); 136 o.stickySidebarPaddingBottom = 0; 137 } 138 else { 139 o.stickySidebarPaddingBottom = 1; 140 } 141 142 // We use this to know whether the user is scrolling up or down. 143 o.previousScrollTop = null; 144 145 // Scroll top (value) when the sidebar has fixed position. 146 o.fixedScrollTop = 0; 147 148 // Set sidebar to default values. 149 resetSidebar(); 150 151 o.onScroll = function (o) { 152 // Stop if the sidebar isn't visible. 153 if (!o.stickySidebar.is(":visible")) { 154 return; 155 } 156 157 // Stop if the window is too small. 158 if ($('body').width() < o.options.minWidth) { 159 resetSidebar(); 160 return; 161 } 162 163 // Stop if the sidebar width is larger than the container width (e.g. the theme is responsive and the sidebar is now below the content) 164 if (o.options.disableOnResponsiveLayouts) { 165 var sidebarWidth = o.sidebar.outerWidth(o.sidebar.css('float') == 'none'); 166 167 if (sidebarWidth + 50 > o.container.width()) { 168 resetSidebar(); 169 return; 170 } 171 } 172 173 var scrollTop = $(document).scrollTop(); 174 var position = 'static'; 175 176 // If the user has scrolled down enough for the sidebar to be clipped at the top, then we can consider changing its position. 177 if (scrollTop >= o.container.offset().top + (o.paddingTop + o.marginTop - o.options.additionalMarginTop)) { 178 // The top and bottom offsets, used in various calculations. 179 var offsetTop = o.paddingTop + o.marginTop + options.additionalMarginTop; 180 var offsetBottom = o.paddingBottom + o.marginBottom + options.additionalMarginBottom; 181 182 // All top and bottom positions are relative to the window, not to the parent elemnts. 183 var containerTop = o.container.offset().top; 184 var containerBottom = o.container.offset().top + getClearedHeight(o.container); 185 186 // The top and bottom offsets relative to the window screen top (zero) and bottom (window height). 187 var windowOffsetTop = 0 + options.additionalMarginTop; 188 var windowOffsetBottom; 189 190 var sidebarSmallerThanWindow = (o.stickySidebar.outerHeight() + offsetTop + offsetBottom) < $(window).height(); 191 if (sidebarSmallerThanWindow) { 192 windowOffsetBottom = windowOffsetTop + o.stickySidebar.outerHeight(); 193 } 194 else { 195 windowOffsetBottom = $(window).height() - o.marginBottom - o.paddingBottom - options.additionalMarginBottom; 196 } 197 198 var staticLimitTop = containerTop - scrollTop + o.paddingTop + o.marginTop; 199 var staticLimitBottom = containerBottom - scrollTop - o.paddingBottom - o.marginBottom; 200 201 var top = o.stickySidebar.offset().top - scrollTop; 202 var scrollTopDiff = o.previousScrollTop - scrollTop; 203 204 // If the sidebar position is fixed, then it won't move up or down by itself. So, we manually adjust the top coordinate. 205 if (o.stickySidebar.css('position') == 'fixed') { 206 if (o.options.sidebarBehavior == 'modern') { 207 top += scrollTopDiff; 208 } 209 } 210 211 if (o.options.sidebarBehavior == 'stick-to-top') { 212 top = options.additionalMarginTop; 213 } 214 215 if (o.options.sidebarBehavior == 'stick-to-bottom') { 216 top = windowOffsetBottom - o.stickySidebar.outerHeight(); 217 } 218 219 if (scrollTopDiff > 0) { // If the user is scrolling up. 220 top = Math.min(top, windowOffsetTop); 221 } 222 else { // If the user is scrolling down. 223 top = Math.max(top, windowOffsetBottom - o.stickySidebar.outerHeight()); 224 } 225 226 top = Math.max(top, staticLimitTop); 227 228 top = Math.min(top, staticLimitBottom - o.stickySidebar.outerHeight()); 229 230 // If the sidebar is the same height as the container, we won't use fixed positioning. 231 var sidebarSameHeightAsContainer = o.container.height() == o.stickySidebar.outerHeight(); 232 233 if (!sidebarSameHeightAsContainer && top == windowOffsetTop) { 234 position = 'fixed'; 235 } 236 else if (!sidebarSameHeightAsContainer && top == windowOffsetBottom - o.stickySidebar.outerHeight()) { 237 position = 'fixed'; 238 } 239 else if (scrollTop + top - o.sidebar.offset().top - o.paddingTop <= options.additionalMarginTop) { 240 // Stuck to the top of the page. No special behavior. 241 position = 'static'; 242 } 243 else { 244 // Stuck to the bottom of the page. 245 position = 'absolute'; 246 } 247 } 248 249 /*
250 * Performance notice: It's OK to set these CSS values at each resize/scroll, even if they don't change. 251 * It's way slower to first check if the values have changed. 252 */ 253 if (position == 'fixed') { 254 o.stickySidebar.css({ 255 'position': 'fixed', 256 'width': o.sidebar.width(), 257 'top': top, 258 'left': o.sidebar.offset().left + parseInt(o.sidebar.css('padding-left')) 259 }); 260 } 261 else if (position == 'absolute') { 262 var css = {}; 263 264 if (o.stickySidebar.css('position') != 'absolute') { 265 css.position = 'absolute'; 266 css.top = scrollTop + top - o.sidebar.offset().top - o.stickySidebarPaddingTop - o.stickySidebarPaddingBottom; 267 } 268 269 css.width = o.sidebar.width(); 270 css.left = ''; 271 272 o.stickySidebar.css(css); 273 } 274 else if (position == 'static') { 275 resetSidebar(); 276 } 277 278 if (position != 'static') { 279 if (o.options.updateSidebarHeight == true) { 280 o.sidebar.css({ 281 'min-height': o.stickySidebar.outerHeight() + o.stickySidebar.offset().top - o.sidebar.offset().top + o.paddingBottom 282 }); 283 } 284 } 285 286 o.previousScrollTop = scrollTop; 287 }; 288 289 // Initialize the sidebar's position. 290 o.onScroll(o); 291 292 // Recalculate the sidebar's position on every scroll and resize. 293 $(document).scroll(function (o) { 294 return function () { 295 o.onScroll(o); 296 }; 297 }(o)); 298 $(window).resize(function (o) { 299 return function () { 300 o.stickySidebar.css({'position': 'static'}); 301 o.onScroll(o); 302 }; 303 }(o)); 304 305 // Reset the sidebar to its default state 306 function resetSidebar() { 307 o.fixedScrollTop = 0; 308 o.sidebar.css({ 309 'min-height': '1px' 310 }); 311 o.stickySidebar.css({ 312 'position': 'static', 313 'width': '' 314 }); 315 } 316 317 // Get the height of a div as if its floated children were cleared. Note that this function fails if the floats are more than one level deep. 318 function getClearedHeight(e) { 319 var height = e.height(); 320 321 e.children().each(function () { 322 height = Math.max(height, $(this).height()); 323 }); 324 325 return height; 326 } 327 }); 328 } 329 } 330})(jQuery);
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