451 lines
13 KiB
JavaScript
451 lines
13 KiB
JavaScript
'use strict';
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!function($) {
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/**
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* Sticky module.
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* @module foundation.sticky
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* @requires foundation.util.triggers
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* @requires foundation.util.mediaQuery
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*/
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class Sticky {
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/**
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* Creates a new instance of a sticky thing.
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* @class
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* @param {jQuery} element - jQuery object to make sticky.
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* @param {Object} options - options object passed when creating the element programmatically.
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*/
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constructor(element, options) {
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this.$element = element;
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this.options = $.extend({}, Sticky.defaults, this.$element.data(), options);
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this._init();
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Foundation.registerPlugin(this, 'Sticky');
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}
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/**
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* Initializes the sticky element by adding classes, getting/setting dimensions, breakpoints and attributes
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* @function
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* @private
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*/
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_init() {
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var $parent = this.$element.parent('[data-sticky-container]'),
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id = this.$element[0].id || Foundation.GetYoDigits(6, 'sticky'),
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_this = this;
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if (!$parent.length) {
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this.wasWrapped = true;
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}
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this.$container = $parent.length ? $parent : $(this.options.container).wrapInner(this.$element);
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this.$container.addClass(this.options.containerClass);
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this.$element.addClass(this.options.stickyClass)
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.attr({'data-resize': id});
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this.scrollCount = this.options.checkEvery;
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this.isStuck = false;
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$(window).one('load.zf.sticky', function(){
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if(_this.options.anchor !== ''){
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_this.$anchor = $('#' + _this.options.anchor);
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}else{
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_this._parsePoints();
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}
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_this._setSizes(function(){
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_this._calc(false);
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});
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_this._events(id.split('-').reverse().join('-'));
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});
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}
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/**
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* If using multiple elements as anchors, calculates the top and bottom pixel values the sticky thing should stick and unstick on.
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* @function
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* @private
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*/
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_parsePoints() {
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var top = this.options.topAnchor == "" ? 1 : this.options.topAnchor,
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btm = this.options.btmAnchor== "" ? document.documentElement.scrollHeight : this.options.btmAnchor,
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pts = [top, btm],
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breaks = {};
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for (var i = 0, len = pts.length; i < len && pts[i]; i++) {
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var pt;
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if (typeof pts[i] === 'number') {
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pt = pts[i];
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} else {
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var place = pts[i].split(':'),
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anchor = $(`#${place[0]}`);
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pt = anchor.offset().top;
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if (place[1] && place[1].toLowerCase() === 'bottom') {
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pt += anchor[0].getBoundingClientRect().height;
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}
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}
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breaks[i] = pt;
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}
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this.points = breaks;
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return;
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}
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/**
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* Adds event handlers for the scrolling element.
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* @private
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* @param {String} id - psuedo-random id for unique scroll event listener.
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*/
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_events(id) {
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var _this = this,
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scrollListener = this.scrollListener = `scroll.zf.${id}`;
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if (this.isOn) { return; }
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if (this.canStick) {
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this.isOn = true;
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$(window).off(scrollListener)
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.on(scrollListener, function(e) {
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if (_this.scrollCount === 0) {
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_this.scrollCount = _this.options.checkEvery;
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_this._setSizes(function() {
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_this._calc(false, window.pageYOffset);
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});
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} else {
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_this.scrollCount--;
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_this._calc(false, window.pageYOffset);
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}
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});
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}
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this.$element.off('resizeme.zf.trigger')
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.on('resizeme.zf.trigger', function(e, el) {
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_this._setSizes(function() {
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_this._calc(false);
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if (_this.canStick) {
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if (!_this.isOn) {
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_this._events(id);
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}
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} else if (_this.isOn) {
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_this._pauseListeners(scrollListener);
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}
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});
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});
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}
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/**
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* Removes event handlers for scroll and change events on anchor.
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* @fires Sticky#pause
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* @param {String} scrollListener - unique, namespaced scroll listener attached to `window`
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*/
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_pauseListeners(scrollListener) {
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this.isOn = false;
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$(window).off(scrollListener);
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/**
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* Fires when the plugin is paused due to resize event shrinking the view.
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* @event Sticky#pause
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* @private
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*/
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this.$element.trigger('pause.zf.sticky');
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}
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/**
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* Called on every `scroll` event and on `_init`
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* fires functions based on booleans and cached values
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* @param {Boolean} checkSizes - true if plugin should recalculate sizes and breakpoints.
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* @param {Number} scroll - current scroll position passed from scroll event cb function. If not passed, defaults to `window.pageYOffset`.
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*/
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_calc(checkSizes, scroll) {
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if (checkSizes) { this._setSizes(); }
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if (!this.canStick) {
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if (this.isStuck) {
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this._removeSticky(true);
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}
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return false;
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}
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if (!scroll) { scroll = window.pageYOffset; }
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if (scroll >= this.topPoint) {
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if (scroll <= this.bottomPoint) {
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if (!this.isStuck) {
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this._setSticky();
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}
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} else {
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if (this.isStuck) {
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this._removeSticky(false);
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}
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}
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} else {
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if (this.isStuck) {
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this._removeSticky(true);
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}
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}
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}
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/**
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* Causes the $element to become stuck.
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* Adds `position: fixed;`, and helper classes.
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* @fires Sticky#stuckto
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* @function
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* @private
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*/
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_setSticky() {
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var _this = this,
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stickTo = this.options.stickTo,
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mrgn = stickTo === 'top' ? 'marginTop' : 'marginBottom',
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notStuckTo = stickTo === 'top' ? 'bottom' : 'top',
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css = {};
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css[mrgn] = `${this.options[mrgn]}em`;
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css[stickTo] = 0;
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css[notStuckTo] = 'auto';
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css['left'] = this.$container.offset().left + parseInt(window.getComputedStyle(this.$container[0])["padding-left"], 10);
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this.isStuck = true;
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this.$element.removeClass(`is-anchored is-at-${notStuckTo}`)
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.addClass(`is-stuck is-at-${stickTo}`)
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.css(css)
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/**
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* Fires when the $element has become `position: fixed;`
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* Namespaced to `top` or `bottom`, e.g. `sticky.zf.stuckto:top`
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* @event Sticky#stuckto
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*/
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.trigger(`sticky.zf.stuckto:${stickTo}`);
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this.$element.on("transitionend webkitTransitionEnd oTransitionEnd otransitionend MSTransitionEnd", function() {
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_this._setSizes();
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});
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}
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/**
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* Causes the $element to become unstuck.
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* Removes `position: fixed;`, and helper classes.
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* Adds other helper classes.
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* @param {Boolean} isTop - tells the function if the $element should anchor to the top or bottom of its $anchor element.
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* @fires Sticky#unstuckfrom
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* @private
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*/
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_removeSticky(isTop) {
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var stickTo = this.options.stickTo,
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stickToTop = stickTo === 'top',
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css = {},
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anchorPt = (this.points ? this.points[1] - this.points[0] : this.anchorHeight) - this.elemHeight,
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mrgn = stickToTop ? 'marginTop' : 'marginBottom',
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notStuckTo = stickToTop ? 'bottom' : 'top',
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topOrBottom = isTop ? 'top' : 'bottom';
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css[mrgn] = 0;
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css['bottom'] = 'auto';
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if(isTop) {
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css['top'] = 0;
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} else {
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css['top'] = anchorPt;
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}
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css['left'] = '';
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this.isStuck = false;
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this.$element.removeClass(`is-stuck is-at-${stickTo}`)
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.addClass(`is-anchored is-at-${topOrBottom}`)
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.css(css)
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/**
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* Fires when the $element has become anchored.
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* Namespaced to `top` or `bottom`, e.g. `sticky.zf.unstuckfrom:bottom`
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* @event Sticky#unstuckfrom
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*/
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.trigger(`sticky.zf.unstuckfrom:${topOrBottom}`);
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}
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/**
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* Sets the $element and $container sizes for plugin.
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* Calls `_setBreakPoints`.
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* @param {Function} cb - optional callback function to fire on completion of `_setBreakPoints`.
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* @private
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*/
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_setSizes(cb) {
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this.canStick = Foundation.MediaQuery.atLeast(this.options.stickyOn);
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if (!this.canStick) { cb(); }
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var _this = this,
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newElemWidth = this.$container[0].getBoundingClientRect().width,
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comp = window.getComputedStyle(this.$container[0]),
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pdng = parseInt(comp['padding-right'], 10);
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if (this.$anchor && this.$anchor.length) {
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this.anchorHeight = this.$anchor[0].getBoundingClientRect().height;
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} else {
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this._parsePoints();
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}
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this.$element.css({
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'max-width': `${newElemWidth - pdng}px`
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});
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var newContainerHeight = this.$element[0].getBoundingClientRect().height || this.containerHeight;
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if (this.$element.css("display") == "none") {
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newContainerHeight = 0;
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}
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this.containerHeight = newContainerHeight;
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this.$container.css({
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height: newContainerHeight
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});
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this.elemHeight = newContainerHeight;
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if (this.isStuck) {
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this.$element.css({"left":this.$container.offset().left + parseInt(comp['padding-left'], 10)});
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}
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this._setBreakPoints(newContainerHeight, function() {
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if (cb) { cb(); }
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});
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}
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/**
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* Sets the upper and lower breakpoints for the element to become sticky/unsticky.
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* @param {Number} elemHeight - px value for sticky.$element height, calculated by `_setSizes`.
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* @param {Function} cb - optional callback function to be called on completion.
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* @private
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*/
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_setBreakPoints(elemHeight, cb) {
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if (!this.canStick) {
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if (cb) { cb(); }
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else { return false; }
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}
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var mTop = emCalc(this.options.marginTop),
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mBtm = emCalc(this.options.marginBottom),
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topPoint = this.points ? this.points[0] : this.$anchor.offset().top,
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bottomPoint = this.points ? this.points[1] : topPoint + this.anchorHeight,
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// topPoint = this.$anchor.offset().top || this.points[0],
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// bottomPoint = topPoint + this.anchorHeight || this.points[1],
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winHeight = window.innerHeight;
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if (this.options.stickTo === 'top') {
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topPoint -= mTop;
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bottomPoint -= (elemHeight + mTop);
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} else if (this.options.stickTo === 'bottom') {
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topPoint -= (winHeight - (elemHeight + mBtm));
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bottomPoint -= (winHeight - mBtm);
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} else {
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//this would be the stickTo: both option... tricky
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}
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this.topPoint = topPoint;
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this.bottomPoint = bottomPoint;
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if (cb) { cb(); }
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}
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/**
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* Destroys the current sticky element.
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* Resets the element to the top position first.
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* Removes event listeners, JS-added css properties and classes, and unwraps the $element if the JS added the $container.
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* @function
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*/
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destroy() {
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this._removeSticky(true);
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this.$element.removeClass(`${this.options.stickyClass} is-anchored is-at-top`)
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.css({
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height: '',
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top: '',
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bottom: '',
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'max-width': ''
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})
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.off('resizeme.zf.trigger');
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if (this.$anchor && this.$anchor.length) {
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this.$anchor.off('change.zf.sticky');
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}
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$(window).off(this.scrollListener);
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if (this.wasWrapped) {
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this.$element.unwrap();
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} else {
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this.$container.removeClass(this.options.containerClass)
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.css({
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height: ''
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});
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}
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Foundation.unregisterPlugin(this);
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}
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}
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Sticky.defaults = {
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/**
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* Customizable container template. Add your own classes for styling and sizing.
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* @option
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* @example '<div data-sticky-container class="small-6 columns"></div>'
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*/
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container: '<div data-sticky-container></div>',
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/**
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* Location in the view the element sticks to.
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* @option
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* @example 'top'
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*/
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stickTo: 'top',
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/**
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* If anchored to a single element, the id of that element.
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* @option
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* @example 'exampleId'
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*/
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anchor: '',
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/**
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* If using more than one element as anchor points, the id of the top anchor.
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* @option
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* @example 'exampleId:top'
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*/
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topAnchor: '',
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/**
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* If using more than one element as anchor points, the id of the bottom anchor.
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* @option
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* @example 'exampleId:bottom'
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*/
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btmAnchor: '',
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/**
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* Margin, in `em`'s to apply to the top of the element when it becomes sticky.
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* @option
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* @example 1
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*/
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marginTop: 1,
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/**
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* Margin, in `em`'s to apply to the bottom of the element when it becomes sticky.
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* @option
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* @example 1
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*/
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marginBottom: 1,
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/**
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* Breakpoint string that is the minimum screen size an element should become sticky.
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* @option
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* @example 'medium'
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*/
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stickyOn: 'medium',
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/**
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* Class applied to sticky element, and removed on destruction. Foundation defaults to `sticky`.
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* @option
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* @example 'sticky'
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*/
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stickyClass: 'sticky',
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/**
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* Class applied to sticky container. Foundation defaults to `sticky-container`.
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* @option
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* @example 'sticky-container'
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*/
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containerClass: 'sticky-container',
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/**
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* Number of scroll events between the plugin's recalculating sticky points. Setting it to `0` will cause it to recalc every scroll event, setting it to `-1` will prevent recalc on scroll.
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* @option
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* @example 50
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*/
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checkEvery: -1
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};
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/**
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* Helper function to calculate em values
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* @param Number {em} - number of em's to calculate into pixels
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*/
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function emCalc(em) {
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return parseInt(window.getComputedStyle(document.body, null).fontSize, 10) * em;
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}
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// Window exports
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Foundation.plugin(Sticky, 'Sticky');
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}(jQuery);
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