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/** * [jQuery-stickit]{@link https://github.com/emn178/jquery-stickit} * * @version 0.2.14 * @author Chen, Yi-Cyuan [emn178@gmail.com] * @copyright Chen, Yi-Cyuan 2014-2017 * @license MIT */ (function ($) { var KEY = 'jquery-stickit'; var SPACER_KEY = KEY + '-spacer'; var SELECTOR = ':' + KEY; var IE7 = navigator.userAgent.indexOf('MSIE 7.0') != -1; var OFFSET = IE7 ? -2 : 0; var MUTATION = window.MutationObserver !== undefined; var animationend = 'animationend webkitAnimationEnd oAnimationEnd'; var transitionend = 'transitionend webkitTransitionEnd oTransitionEnd'; var fullscreenchange = 'webkitfullscreenchange mozfullscreenchange fullscreenchange MSFullscreenChange'; var Scope = window.StickScope = { Parent: 0, Document: 1 }; var Stick = { None: 0, Fixed: 1, Absolute: 2 }; var init = false, lock = false; $.expr[':'][KEY] = function (element) { return !!$(element).data(KEY); }; function Sticker(element, optionList) { this.element = $(element); this.lastValues = {}; if (!$.isArray(optionList)) { optionList = [optionList || {}]; } if (!optionList.length) { optionList.push({}); } this.optionList = optionList; var transform = this.element.css('transform') || ''; this.defaultZIndex = this.element.css('z-index') || 100; if (this.defaultZIndex == 'auto') { this.defaultZIndex = 100; } else if (this.defaultZIndex == '0' && transform != 'none') { this.defaultZIndex = 100; } this.updateOptions(); this.offsetY = 0; this.lastY = 0; this.stick = Stick.None; this.spacer = $('<div />'); this.spacer[0].id = element.id; this.spacer[0].className = element.className; this.spacer[0].style.cssText = element.style.cssText; this.spacer.addClass(SPACER_KEY); this.spacer[0].style.cssText += ';visibility: hidden !important;display: none !important'; this.spacer.insertAfter(this.element); if (this.element.parent().css('position') == 'static') { this.element.parent().css('position', 'relative'); } this.origWillChange = this.element.css('will-change'); if (this.origWillChange == 'auto') { this.element.css('will-change', 'transform'); } if (transform == 'none') { this.element.css('transform', 'translateZ(0)'); } else if (transform.indexOf('matrix3d') == -1) { this.element.css('transform', this.element.css('transform') + ' translateZ(0)'); } this.bound(); this.precalculate(); this.store(); } Sticker.prototype.trigger = function (eventName) { var name = 'on' + eventName.charAt(0).toUpperCase() + eventName.slice(1); if (this.options[name]) { this.options[name].call(this.element); } this.element.trigger('stickit:' + eventName); }; Sticker.prototype.isActive = function (options) { return (options.screenMinWidth === undefined || screenWidth >= options.screenMinWidth) && (options.screenMaxWidth === undefined || screenWidth <= options.screenMaxWidth); }; Sticker.prototype.updateCss = function (options) { if (this.element.hasClass(this.options.className) && options.className != this.options.className) { this.element.removeClass(this.options.className).addClass(options.className); } var update = {}; if (this.stick == Stick.Absolute) { if (this.options.extraHeight != options.extraHeight) { update.bottom = -this.options.extraHeight + 'px'; } } else { if (this.options.top != options.top) { update.top = (options.top + this.offsetY) + 'px'; } } if (this.options.zIndex != options.zIndex) { update.zIndex = this.getZIndex(options); } this.element.css(update); }; Sticker.prototype.updateOptions = function () { var activeKey = this.getActiveOptionsKey(); if (this.activeKey == activeKey) { return; } this.activeKey = activeKey; var options = this.getActiveOptions(); if (this.options) { if (!activeKey) { this.reset(); } else if (this.stick != Stick.None) { if (options.scope == this.options.scope) { this.updateCss(options); } else { this.reset(); setTimeout(this.locate.bind(this)); } } } this.options = options; this.zIndex = this.getZIndex(options); }; Sticker.prototype.getZIndex = function (options) { return options.zIndex === undefined ? this.defaultZIndex : options.zIndex; }; Sticker.prototype.getActiveOptionsKey = function () { var indices = []; for (var i = 0;i < this.optionList.length;++i) { if (this.isActive(this.optionList[i])) { indices.push(i); } } return indices.join('_'); }; Sticker.prototype.getActiveOptions = function () { var options = {}; for (var i = 0;i < this.optionList.length;++i) { var opt = this.optionList[i]; if (this.isActive(opt)) { $.extend(options, opt); } } options.scope = options.scope || Scope.Parent; options.className = options.className || 'stick'; options.top = options.top || 0; options.extraHeight = options.extraHeight || 0; if (options.overflowScrolling === undefined) { options.overflowScrolling = true; } return options; }; Sticker.prototype.store = function () { var element = this.element[0]; this.origStyle = { width: element.style.width, position: element.style.position, left: element.style.left, top: element.style.top, bottom: element.style.bottom, zIndex: element.style.zIndex }; }; Sticker.prototype.restore = function () { this.element.css(this.origStyle); }; Sticker.prototype.bound = function () { var element = this.element; if (!IE7 && element.css('box-sizing') == 'border-box') { var bl = parseFloat(element.css('border-left-width')) || 0; var br = parseFloat(element.css('border-right-width')) || 0; var pl = parseFloat(element.css('padding-left')) || 0; var pr = parseFloat(element.css('padding-right')) || 0; this.extraWidth = bl + br + pl + pr; } else { this.extraWidth = 0; } this.margin = { top: parseFloat(element.css('margin-top')) || 0, bottom: parseFloat(element.css('margin-bottom')) || 0, left: parseFloat(element.css('margin-left')) || 0, right: parseFloat(element.css('margin-right')) || 0 }; this.parent = { border: { bottom: parseFloat(element.parent().css('border-bottom-width')) || 0 } }; }; Sticker.prototype.precalculate = function () { this.baseTop = this.margin.top + this.options.top; this.basePadding = this.baseTop + this.margin.bottom; this.baseParentOffset = this.options.extraHeight - this.parent.border.bottom; this.offsetHeight = this.options.overflowScrolling ? Math.max(this.element.outerHeight(false) + this.basePadding - screenHeight, 0) : 0; this.minOffsetHeight = -this.offsetHeight; }; Sticker.prototype.reset = function () { if (this.stick == Stick.Absolute) { this.trigger('unend'); this.trigger('unstick'); } else if (this.stick == Stick.Fixed) { this.trigger('unstick'); } this.stick = Stick.None; this.spacer.css('width', this.origStyle.width); this.spacer[0].style.cssText += ';display: none !important'; this.restore(); this.element.removeClass(this.options.className); }; Sticker.prototype.setAbsolute = function (left) { if (this.stick == Stick.None) { this.element.addClass(this.options.className); this.trigger('stick'); this.trigger('end'); } else { this.trigger('end'); } this.stick = Stick.Absolute; this.element.css({ width: this.element.width() + this.extraWidth + 'px', position: 'absolute', top: this.origStyle.top, left: left + 'px', bottom: -this.options.extraHeight + 'px', 'z-index': this.zIndex }); }; Sticker.prototype.setFixed = function (left, lastY, offsetY) { if (this.stick == Stick.None) { this.element.addClass(this.options.className); this.trigger('stick'); } else { this.trigger('unend'); } if (!this.options.overflowScrolling) { offsetY = 0; } this.stick = Stick.Fixed; this.lastY = lastY; this.offsetY = offsetY; this.element.css({ width: this.element.width() + this.extraWidth + 'px', position: 'fixed', top: (this.options.top + offsetY) + 'px', left: left + 'px', bottom: this.origStyle.bottom, 'z-index': this.zIndex }); }; Sticker.prototype.updateScroll = function (newY) { if (this.offsetHeight == 0 || !this.options.overflowScrolling) { return; } var offsetY = Math.max(this.offsetY + newY - this.lastY, this.minOffsetHeight); offsetY = Math.min(offsetY, 0); this.lastY = newY; if (this.offsetY == offsetY) { return; } this.offsetY = offsetY; this.element.css('top', (this.options.top + this.offsetY) + 'px'); }; Sticker.prototype.isHeigher = function () { return this.options.scope == Scope.Parent && this.element.parent().height() <= this.element.outerHeight(false) + this.margin.bottom; }; Sticker.prototype.locate = function () { if (!this.activeKey) { return; } var rect, top, left, element = this.element, spacer = this.spacer; switch (this.stick) { case Stick.Fixed: rect = spacer[0].getBoundingClientRect(); top = rect.top - this.baseTop; if (top >= 0 || this.isHeigher()) { this.reset(); } else if (this.options.scope == Scope.Parent) { rect = element.parent()[0].getBoundingClientRect(); if (rect.bottom + this.baseParentOffset + this.offsetHeight <= element.outerHeight(false) + this.basePadding) { this.setAbsolute(this.spacer.position().left); } else { this.updateScroll(rect.bottom); } } else { this.updateScroll(rect.bottom); } break; case Stick.Absolute: rect = spacer[0].getBoundingClientRect(); top = rect.top - this.baseTop; left = rect.left - this.margin.left; if (top >= 0 || this.isHeigher()) { this.reset(); } else { rect = element.parent()[0].getBoundingClientRect(); if (rect.bottom + this.baseParentOffset + this.offsetHeight > element.outerHeight(false) + this.basePadding) { this.setFixed(left + OFFSET, rect.bottom, -this.offsetHeight); } } break; case Stick.None: /* falls through */ default: rect = element[0].getBoundingClientRect(); top = rect.top - this.baseTop; if (top >= 0 || this.isHeigher()) { return; } var rect2 = element.parent()[0].getBoundingClientRect(); spacer.height(element.height()); spacer.show(); left = rect.left - this.margin.left; if (this.options.scope == Scope.Document) { this.setFixed(left, rect.bottom, 0); } else { if (rect2.bottom + this.baseParentOffset + this.offsetHeight <= element.outerHeight(false) + this.basePadding) { this.setAbsolute(this.element.position().left); } else { this.setFixed(left + OFFSET, rect.bottom, 0); } } if (!spacer.width()) { spacer.width(element.width()); } break; } }; Sticker.prototype.refresh = function () { this.updateOptions(); this.bound(); this.precalculate(); if (this.stick == Stick.None) { this.locate(); return; } var element = this.element; var spacer = this.spacer; if (this.lastValues.width != spacer.width()) { element.width(this.lastValues.width = spacer.width()); } if (this.lastValues.height != element.height()) { spacer.height(this.lastValues.height = element.height()); } if (this.stick == Stick.Fixed) { var rect = this.spacer[0].getBoundingClientRect(); var left = rect.left - this.margin.left; if (this.lastValues.left != left + 'px') { element.css('left', this.lastValues.left = left + 'px'); } } this.locate(); }; Sticker.prototype.destroy = function () { this.reset(); this.spacer.remove(); this.element.removeData(KEY); }; Sticker.prototype.enableWillChange = function (enabled) { if (this.origWillChange != 'auto') { return; } this.element.css('will-change', enabled ? 'transform' : this.origWillChange); }; var screenHeight, screenWidth; function resize() { screenHeight = window.innerHeight || document.documentElement.clientHeight; screenWidth = window.innerWidth || document.documentElement.clientWidth; refresh(); } function refresh() { lock = true; $(SELECTOR).each(function () { $(this).data(KEY).refresh(); }); setTimeout(function () { lock = false; }); } function scroll() { lock = true; $(SELECTOR).each(function () { $(this).data(KEY).locate(); }); setTimeout(function () { lock = false; }); }; function onFullscreenChange() { var fullscreen = !!(document.fullscreenElement || document.mozFullScreenElement || document.webkitFullscreenElement || document.msFullscreenElement); $(SELECTOR).each(function () { $(this).data(KEY).enableWillChange(!fullscreen); }); } function mutationUpdate(records) { if (!lock) { refresh(); } } var PublicMethods = ['destroy', 'refresh']; $.fn.stickit = function (method, options) { // init if (typeof(method) == 'string') { if ($.inArray(method, PublicMethods) != -1) { var args = arguments; this.each(function () { var sticker = $(this).data(KEY); if (sticker) { sticker[method].apply(sticker, Array.prototype.slice.call(args, 1)); } }); } } else { if (!init) { init = true; resize(); $(document).ready(function () { $(window).bind('resize', resize).bind('scroll', scroll); $(document.body).bind(animationend + ' ' + transitionend, scroll); $(document).bind(fullscreenchange, onFullscreenChange); }); if (MUTATION) { var observer = new MutationObserver(mutationUpdate); observer.observe(document, { attributes: true, childList: true, characterData: true, subtree: true }); } } if ($.isArray(method)) { options = method; } else { options = Array.prototype.slice.call(arguments, 0); } this.each(function () { var sticker = new Sticker(this, options); $(this).data(KEY, sticker); sticker.locate(); }); } return this; }; $.stickit = { refresh: refresh }; })(jQuery);
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