586 lines
14 KiB
JavaScript
586 lines
14 KiB
JavaScript
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webshim.register('sticky', function($, webshim, window, document, undefined, featureOptions){
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"use strict";
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var uid = 0;
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var stickys = 0;
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var $window = $(window);
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function getCssValue(property, value, noPrefixes) {
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var prop = property + ':',
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el = document.createElement('test'),
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mStyle = el.style;
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if (!noPrefixes) {
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mStyle.cssText = prop + [ '-webkit-', '-moz-', '-ms-', '-o-', '' ].join(value + ';' + prop) + value + ';';
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} else {
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mStyle.cssText = prop + value;
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}
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return mStyle[ property ];
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}
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function getPos() {
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return {
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top: $.css(this, 'top'),
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bottom: $.css(this, 'bottom')
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};
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}
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var getWinScroll = (function () {
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var docElem;
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var prop = 'pageYOffset';
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return (prop in window) ?
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function () {
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return window[ prop ];
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} :
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((docElem = document.documentElement), function () {
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return docElem.scrollTop;
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})
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;
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})();
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var isTouch = 'ontouchstart' in window || window.matchMedia('(max-device-width: 721px)').matches;
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var support = {
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fixed: getCssValue('position', 'fixed', true),
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sticky: getCssValue('position', 'sticky')
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};
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var stickyMixin = {
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getPosition: function () {
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if(!this.isSticky){
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this.position = {
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top: this.$el.css('top'),
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bottom: this.$el.css('bottom')
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};
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if (((
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(this.position.top != 'auto' && this.position.bottom != 'auto') ||
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this.position.top == 'auto' && this.position.bottom == 'auto')) && this.$el.css('position') == 'static') {
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this.position = $.swap(this.$el[0], {position: 'absolute'}, getPos);
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}
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if (this.position.top !== 'auto') {
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this.ankered = 'top';
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} else if (this.position.bottom !== 'auto') {
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this.ankered = 'bottom';
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}
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if(this.ankered == 'top'){
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this.position.top = parseFloat(this.position.top, 10) || 0;
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} else if(this.ankered == 'bottom'){
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this.position.bottom = parseFloat(this.position.bottom, 10) || 0;
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}
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}
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},
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update: function (full) {
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if (!this.disabled && this.$el[0].offsetWidth) {
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if (full) {
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if(this.isSticky){
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this.removeSticky();
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}
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this.getPosition();
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}
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this.updateDimension();
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}
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},
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setTdWidth: function(){
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if(this.isTable){
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this.$el.find('td, th').each(this._setInlineWidth);
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}
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},
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_setInlineWidth: function(){
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$.data(this, 'inlineWidth', this.style.width);
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$(this).innerWidth($(this).innerWidth());
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},
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_restoreInlineWidth: function(){
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this.style.width = $.data(this, 'inlineWidth') || '';
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$.removeData(this, 'inlineWidth');
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},
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removeSticky: function(){
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this.$el.removeClass('ws-sticky-on');
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this.$el.css(this.stickyData.inline);
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this.$placeholder.detach();
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this.isSticky = false;
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if(this.isTable){
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this.$el.find('td, th').each(this._restoreInlineWidth);
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}
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},
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commonAddEvents: function(){
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var enableDisable;
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var that = this;
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var update = function() {
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that.update();
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};
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var stickyMedia = this.$el.data('stickymedia');
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var media = window.matchMedia && stickyMedia ? matchMedia(stickyMedia) : false;
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$window.one('load', update);
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$(document).on('updateshadowdom' + this.evtid, update);
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this.$el.on('updatesticky'+ this.evtid, function(e){
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that.update(true);
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e.stopPropagation();
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});
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this.$el.on('disablesticky'+ this.evtid, function(e){
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that.disable(true);
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e.stopPropagation();
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});
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this.$el.on('enablesticky'+ this.evtid, function(e){
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that.disable(false);
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e.stopPropagation();
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});
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this.$el.on('remove'+ this.evtid+' destroysticky'+ this.evtid, function(e) {
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$window.off(that.evtid);
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$(document).off(that.evtid);
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that.$el.off(that.evtid);
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that.$parent.off(that.evtid);
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that.$el.removeData('wsSticky').removeClass('ws-sticky');
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if (that.$placeholder) {
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that.$el.removeClass('ws-sticky-on');
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that.$placeholder.remove();
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}
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stickys--;
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e.stopPropagation();
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});
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if(media && media.addListener){
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enableDisable = function(){
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that.disable(!media.matches);
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};
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media.addListener(enableDisable);
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enableDisable();
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}
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},
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disable: function(disable){
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if(!arguments.length){
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return this.disabled;
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}
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if(this.disabled != disable){
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this.disabled = !!disable;
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if(this.disabled){
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if(this.isSticky){
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this.removeSticky();
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}
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} else {
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this.update(true);
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}
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}
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},
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setSticky: function(){
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if (!this.$placeholder) {
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this.$placeholder = this.isTable ? $(this.$el[0].cloneNode(true)) : $(document.createElement(this.$el[0].nodeName || 'div'));
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this.$placeholder.addClass('ws-fixedsticky-placeholder').removeClass('ws-sticky');
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}
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this.setTdWidth();
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this.$placeholder
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.insertAfter(this.$el)
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.outerHeight(this.stickyData.outerHeight, true)
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.outerWidth(this.stickyData.outerWidth)
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;
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this.isSticky = true;
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this.$el.addClass('ws-sticky-on');
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if(!this.isTable){
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if( this.stickyData.width != this.$el.width()){
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this.$el.width(this.stickyData.width);
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}
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}
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},
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getCommonStickyData: function(){
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var marginTop = (parseFloat(this.$el.css('marginTop'), 10) || 0);
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this.stickyData.scrollTop = this.stickyData.top - marginTop;
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this.stickyData.outerHeight = this.$el.outerHeight(true);
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this.stickyData.bottom = this.stickyData.top + this.stickyData.outerHeight - marginTop;
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this.stickyData.width = this.$el.width();
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this.stickyData.outerWidth = this.$el.outerWidth();
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this.stickyData.marginLeft = parseFloat(this.$el.css('marginLeft'), 10) || 0;
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this.stickyData.offsetLeft = this.$el[0].offsetLeft;
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this.stickyData.inline.width = this.elStyle.width;
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this.stickyData.inline.marginLeft = this.elStyle.marginLeft;
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if(this.ankered == 'top'){
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this.stickyData.inline.top = this.elStyle.top;
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} else if(this.ankered == 'bottom'){
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this.stickyData.inline.bottom = this.elStyle.bottom;
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}
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},
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getCommonParentData: function(){
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this.parentData.paddingTop = (parseFloat(this.$parent.css('paddingTop'), 10) || 0);
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this.parentData.offsetTop = this.$parent.offset().top;
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this.parentData.top = this.parentData.offsetTop + (parseFloat(this.$parent.css('borderTopWidth'), 10) || 0) + this.parentData.paddingTop;
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this.parentData.height = this.$parent.height();
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this.parentData.bottom = this.parentData.top + this.parentData.height;
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}
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};
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if(isTouch && featureOptions.touchStrategy == 'disable'){return;}
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function Sticky(dom) {
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uid++;
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stickys++;
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this.evtid = '.wsstickyid' + uid;
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this.$el = $(dom).data('wsSticky', this);
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this.isTable = this.$el.is('thead, tbody, tfoot');
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this.$parent = this.$el.parent();
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this.elStyle = dom.style;
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this.ankered = '';
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this.isSticky = false;
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this.$placeholder = null;
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this.stickyData = {inline: {}};
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this.parentData = {};
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this.getParentData = this.getCommonParentData;
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this.addEvents();
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this.update(true);
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}
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$.extend(Sticky.prototype, stickyMixin, {
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addEvents: function () {
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var that = this;
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this.commonAddEvents();
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$window
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.on('scroll' + this.evtid, function () {
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if (!that.disabled && that.ankered && that.$el[0].offsetWidth) {
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that.updatePos();
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}
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})
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;
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},
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getStickyData: function(){
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this.stickyData.top = this.$el.offset().top;
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this.getCommonStickyData();
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},
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updateDimension: function(fromPos){
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if(this.isSticky){
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this.removeSticky();
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}
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this.getParentData();
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this.getStickyData();
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if (this.ankered == 'bottom') {
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this.viewportBottomAnker = $window.height() - this.position.bottom;
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}
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if(!fromPos && this.ankered){
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this.updatePos(true);
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}
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},
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updatePos: function(fromDimension){
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var offset, shouldSticky, shouldMoveWith;
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var scroll = getWinScroll();
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if (this.ankered == 'top') {
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offset = scroll + this.position.top;
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if(this.stickyData.scrollTop < offset && scroll - 9 <= this.parentData.bottom){
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shouldMoveWith = ((offset + this.stickyData.outerHeight) - this.parentData.bottom) * -1;
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shouldSticky = true;
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}
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} else if (this.ankered == 'bottom') {
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offset = scroll + this.viewportBottomAnker;
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if(this.stickyData.bottom > offset &&
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offset + 9 >= this.parentData.top){
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shouldSticky = true;
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shouldMoveWith = offset - this.parentData.top - this.stickyData.outerHeight;
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}
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}
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if (shouldSticky) {
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if (!this.isSticky) {
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//updateDimension before layout trashing
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if(!fromDimension){
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this.updateDimension(true);
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}
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this.setSticky();
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}
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if(shouldMoveWith < 0){
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if(this.ankered == 'top'){
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this.elStyle.top = this.position.top + shouldMoveWith +'px';
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} else if(this.ankered == 'bottom'){
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this.elStyle.bottom = this.position.bottom + shouldMoveWith +'px';
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}
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}
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} else if (this.isSticky) {
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this.removeSticky();
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}
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}
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});
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function StickyParent(dom) {
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uid++;
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stickys++;
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this.evtid = '.wsstickyid' + uid;
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this.$el = $(dom).data('wsSticky', this);
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this.isTable = this.$el.is('thead, tbody, tfoot');
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this.$parent = this.$el.parent();
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this.elStyle = dom.style;
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this.ankered = '';
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this.isSticky = false;
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this.$placeholder = null;
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this.stickyData = {inline: {}};
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this.parentData = {};
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if(this.$parent.css('position') == 'static'){
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this.$parent.css('position', 'relative');
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}
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this.updatePos2 = this.updatePos2.bind(this);
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this.addEvents();
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this.update(true);
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}
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$.extend(StickyParent.prototype, stickyMixin, {
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addEvents: function () {
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var that = this;
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this.commonAddEvents();
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this.$parent
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.on('scroll' + this.evtid, function () {
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if (that.ankered && that.$el[0].offsetWidth) {
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that.updatePos();
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}
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})
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;
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},
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getStickyData: function(){
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this.stickyData.top = this.$el[0].offsetTop;
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this.getCommonStickyData();
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},
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getParentData: function(){
|
||
|
|
this.getCommonParentData();
|
||
|
|
|
||
|
|
this.parentData.offsetBottom = this.parentData.top + this.$parent.outerHeight();
|
||
|
|
},
|
||
|
|
updateDimension: function(fromPos){
|
||
|
|
var add;
|
||
|
|
if(this.isSticky){
|
||
|
|
this.removeSticky();
|
||
|
|
}
|
||
|
|
this.getParentData();
|
||
|
|
this.getStickyData();
|
||
|
|
|
||
|
|
this.viewport = $window.height();
|
||
|
|
|
||
|
|
if(this.ankered == 'top'){
|
||
|
|
add = Math.abs(this.position.top) + 9;
|
||
|
|
} else if(this.ankered == 'bottom') {
|
||
|
|
add = Math.abs(this.position.bottom) + 9;
|
||
|
|
this.viewportBottomAnker = this.viewport - this.parentData.bottom;
|
||
|
|
this.compareBottom = this.stickyData.bottom + this.position.bottom;
|
||
|
|
|
||
|
|
this.addBottom = (this.parentData.bottom - this.parentData.paddingTop) - this.viewport;
|
||
|
|
}
|
||
|
|
|
||
|
|
this.viewPortMax = this.parentData.offsetBottom + add + 10;
|
||
|
|
this.viewPortMin = this.parentData.offsetTop - add - this.viewport;
|
||
|
|
|
||
|
|
if(!fromPos){
|
||
|
|
this.updatePos(true);
|
||
|
|
}
|
||
|
|
},
|
||
|
|
updatePos: function(fromDimension){
|
||
|
|
var offset, shouldSticky;
|
||
|
|
var scroll = this.$parent[0].scrollTop;
|
||
|
|
|
||
|
|
if (this.ankered == 'top') {
|
||
|
|
offset = scroll + this.position.top ;
|
||
|
|
if(this.stickyData.scrollTop - this.parentData.paddingTop < offset){
|
||
|
|
shouldSticky = true;
|
||
|
|
}
|
||
|
|
} else if (this.ankered == 'bottom') {
|
||
|
|
if(scroll + this.parentData.height < this.compareBottom){
|
||
|
|
shouldSticky = true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (shouldSticky) {
|
||
|
|
if (!this.isSticky) {
|
||
|
|
|
||
|
|
//updateDimension before layout trashing
|
||
|
|
if(!fromDimension){
|
||
|
|
this.updateDimension(true);
|
||
|
|
}
|
||
|
|
|
||
|
|
this.setSticky();
|
||
|
|
|
||
|
|
$window
|
||
|
|
.off('scroll' + this.evtid, this.updatePos2)
|
||
|
|
.on('scroll' + this.evtid, this.updatePos2)
|
||
|
|
;
|
||
|
|
this.updatePos2(true);
|
||
|
|
}
|
||
|
|
} else if (this.isSticky) {
|
||
|
|
this.removeSticky();
|
||
|
|
$window.off('scroll' + this.evtid, this.updatePos2);
|
||
|
|
}
|
||
|
|
},
|
||
|
|
updatePos2: function(init){
|
||
|
|
var scrollTop = getWinScroll();
|
||
|
|
|
||
|
|
if(init === true || (this.viewPortMax > scrollTop && scrollTop > this.viewPortMin)){
|
||
|
|
|
||
|
|
if(this.ankered == 'top'){
|
||
|
|
if(init === true || (this.viewPortMax > scrollTop && scrollTop > this.viewPortMin)){
|
||
|
|
this.elStyle.top = this.position.top + this.parentData.top - scrollTop +'px';
|
||
|
|
}
|
||
|
|
} else if(this.ankered == 'bottom'){
|
||
|
|
this.elStyle.bottom = this.position.bottom + (scrollTop - this.addBottom) +'px';
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
var loadDomSupport = function(){
|
||
|
|
loadDomSupport = $.noop;
|
||
|
|
webshim.ready('WINDOWLOAD', function(){
|
||
|
|
webshim.loader.loadList(['dom-extend']);
|
||
|
|
webshim.ready('dom-extend', function(){
|
||
|
|
webshim.addShadowDom();
|
||
|
|
});
|
||
|
|
});
|
||
|
|
};
|
||
|
|
|
||
|
|
var addSticky = function(){
|
||
|
|
var stickyData = $.data(this, 'wsSticky');
|
||
|
|
if(!stickyData){
|
||
|
|
var $parent = $(this).parent();
|
||
|
|
$(this).addClass('ws-sticky');
|
||
|
|
if(($parent.css('overflowY') || $parent.css('overflow') || 'visible') == 'visible'){
|
||
|
|
new Sticky(this);
|
||
|
|
} else {
|
||
|
|
//webshim.warn('currently not supported');
|
||
|
|
new StickyParent(this);
|
||
|
|
}
|
||
|
|
loadDomSupport();
|
||
|
|
} else if(stickyData.disable) {
|
||
|
|
stickyData.disable(false);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
if (!support.sticky && support.fixed) {
|
||
|
|
var selectors = {};
|
||
|
|
var createUpdateDomSearch = function(media, sels){
|
||
|
|
var i, created, elems;
|
||
|
|
|
||
|
|
var updated = [];
|
||
|
|
|
||
|
|
if(!selectors[media]){
|
||
|
|
selectors[media] = {sels: {}, string: '',
|
||
|
|
fn: function(context, insertedElement){
|
||
|
|
var elems = $(selectors[media].string, context).add(insertedElement.filter(selectors[media].string));
|
||
|
|
if(media){
|
||
|
|
elems.data('stickymedia', media);
|
||
|
|
}
|
||
|
|
elems.each(addSticky);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
created = true;
|
||
|
|
}
|
||
|
|
|
||
|
|
for(i = 0; i < sels.length; i++){
|
||
|
|
if(!selectors[media].sels[sels[i]]){
|
||
|
|
selectors[media].sels[sels[i]] = true;
|
||
|
|
updated.push(sels[i]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if(!created && !updated.length){return;}
|
||
|
|
|
||
|
|
selectors[media].string = Object.keys(selectors[media].sels).join(', ');
|
||
|
|
|
||
|
|
if(created){
|
||
|
|
$(function(){
|
||
|
|
webshim.addReady(selectors[media].fn);
|
||
|
|
});
|
||
|
|
} else if($.isReady){
|
||
|
|
elems = $(updated.join(', '));
|
||
|
|
if(media){
|
||
|
|
elems.data('stickymedia', media);
|
||
|
|
}
|
||
|
|
elems.each(addSticky);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
createUpdateDomSearch('', ['.ws-sticky']);
|
||
|
|
|
||
|
|
$(function(){
|
||
|
|
$(document).on('wssticky', function(e){
|
||
|
|
addSticky.call(e.target);
|
||
|
|
});
|
||
|
|
});
|
||
|
|
|
||
|
|
|
||
|
|
if(featureOptions.parseCSS){
|
||
|
|
if(window.Polyfill && Polyfill.prototype && Polyfill.prototype.doMatched){
|
||
|
|
var onEnableRule = function(rule){
|
||
|
|
var curSelectors = rule.getSelectors().split(/\,\s*/g);
|
||
|
|
var media = (!rule._rule.media || !rule._rule.media.length) ? '' : rule.getMedia();
|
||
|
|
createUpdateDomSearch(media || '', curSelectors);
|
||
|
|
};
|
||
|
|
|
||
|
|
Polyfill({declarations:["position:sticky"]})
|
||
|
|
.doMatched(function(rules){
|
||
|
|
rules.each(onEnableRule);
|
||
|
|
})
|
||
|
|
;
|
||
|
|
|
||
|
|
} else {
|
||
|
|
webshim.warn('Polyfill for CSS polyfilling made easy has to be included');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if(document.readyState == 'complete'){
|
||
|
|
webshim.isReady('WINDOWLOAD', true);
|
||
|
|
}
|
||
|
|
});
|