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546 lines
No EOL
20 KiB
JavaScript
546 lines
No EOL
20 KiB
JavaScript
/*!
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* Stickyfill – `position: sticky` polyfill
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* v. 2.1.0 | https://github.com/wilddeer/stickyfill
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* MIT License
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*/
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;(function(window, document) {
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'use strict';
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/*
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* 1. Check if the browser supports `position: sticky` natively or is too old to run the polyfill.
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* If either of these is the case set `seppuku` flag. It will be checked later to disable key features
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* of the polyfill, but the API will remain functional to avoid breaking things.
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*/
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var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
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function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
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var seppuku = false;
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var isWindowDefined = typeof window !== 'undefined';
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// The polyfill can’t function properly without `window` or `window.getComputedStyle`.
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if (!isWindowDefined || !window.getComputedStyle) seppuku = true;
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// Dont’t get in a way if the browser supports `position: sticky` natively.
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else {
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(function () {
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var testNode = document.createElement('div');
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if (['', '-webkit-', '-moz-', '-ms-'].some(function (prefix) {
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try {
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testNode.style.position = prefix + 'sticky';
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} catch (e) {}
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return testNode.style.position != '';
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})) seppuku = true;
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})();
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}
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/*
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* 2. “Global” vars used across the polyfill
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*/
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var isInitialized = false;
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// Check if Shadow Root constructor exists to make further checks simpler
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var shadowRootExists = typeof ShadowRoot !== 'undefined';
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// Last saved scroll position
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var scroll = {
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top: null,
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left: null
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};
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// Array of created Sticky instances
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var stickies = [];
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/*
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* 3. Utility functions
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*/
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function extend(targetObj, sourceObject) {
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for (var key in sourceObject) {
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if (sourceObject.hasOwnProperty(key)) {
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targetObj[key] = sourceObject[key];
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}
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}
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}
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function parseNumeric(val) {
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return parseFloat(val) || 0;
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}
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function getDocOffsetTop(node) {
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var docOffsetTop = 0;
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while (node) {
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docOffsetTop += node.offsetTop;
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node = node.offsetParent;
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}
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return docOffsetTop;
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}
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/*
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* 4. Sticky class
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*/
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var Sticky = function () {
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function Sticky(node) {
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_classCallCheck(this, Sticky);
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if (!(node instanceof HTMLElement)) throw new Error('First argument must be HTMLElement');
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if (stickies.some(function (sticky) {
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return sticky._node === node;
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})) throw new Error('Stickyfill is already applied to this node');
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this._node = node;
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this._stickyMode = null;
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this._active = false;
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stickies.push(this);
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this.refresh();
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}
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_createClass(Sticky, [{
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key: 'refresh',
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value: function refresh() {
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if (seppuku || this._removed) return;
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if (this._active) this._deactivate();
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var node = this._node;
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/*
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* 1. Save node computed props
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*/
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var nodeComputedStyle = getComputedStyle(node);
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var nodeComputedProps = {
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position: nodeComputedStyle.position,
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top: nodeComputedStyle.top,
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display: nodeComputedStyle.display,
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marginTop: nodeComputedStyle.marginTop,
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marginBottom: nodeComputedStyle.marginBottom,
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marginLeft: nodeComputedStyle.marginLeft,
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marginRight: nodeComputedStyle.marginRight,
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cssFloat: nodeComputedStyle.cssFloat
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};
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/*
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* 2. Check if the node can be activated
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*/
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if (isNaN(parseFloat(nodeComputedProps.top)) || nodeComputedProps.display == 'table-cell' || nodeComputedProps.display == 'none') return;
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this._active = true;
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/*
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* 3. Check if the current node position is `sticky`. If it is, it means that the browser supports sticky positioning,
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* but the polyfill was force-enabled. We set the node’s position to `static` before continuing, so that the node
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* is in it’s initial position when we gather its params.
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*/
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var originalPosition = node.style.position;
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if (nodeComputedStyle.position == 'sticky' || nodeComputedStyle.position == '-webkit-sticky') node.style.position = 'static';
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/*
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* 4. Get necessary node parameters
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*/
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var referenceNode = node.parentNode;
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var parentNode = shadowRootExists && referenceNode instanceof ShadowRoot ? referenceNode.host : referenceNode;
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var nodeWinOffset = node.getBoundingClientRect();
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var parentWinOffset = parentNode.getBoundingClientRect();
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var parentComputedStyle = getComputedStyle(parentNode);
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this._parent = {
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node: parentNode,
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styles: {
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position: parentNode.style.position
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},
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offsetHeight: parentNode.offsetHeight
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};
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this._offsetToWindow = {
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left: nodeWinOffset.left,
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right: document.documentElement.clientWidth - nodeWinOffset.right
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};
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this._offsetToParent = {
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top: nodeWinOffset.top - parentWinOffset.top - parseNumeric(parentComputedStyle.borderTopWidth),
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left: nodeWinOffset.left - parentWinOffset.left - parseNumeric(parentComputedStyle.borderLeftWidth),
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right: -nodeWinOffset.right + parentWinOffset.right - parseNumeric(parentComputedStyle.borderRightWidth)
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};
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this._styles = {
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position: originalPosition,
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top: node.style.top,
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bottom: node.style.bottom,
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left: node.style.left,
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right: node.style.right,
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width: node.style.width,
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marginTop: node.style.marginTop,
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marginLeft: node.style.marginLeft,
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marginRight: node.style.marginRight
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};
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var nodeTopValue = parseNumeric(nodeComputedProps.top);
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this._limits = {
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start: nodeWinOffset.top + window.pageYOffset - nodeTopValue,
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end: parentWinOffset.top + window.pageYOffset + parentNode.offsetHeight - parseNumeric(parentComputedStyle.borderBottomWidth) - node.offsetHeight - nodeTopValue - parseNumeric(nodeComputedProps.marginBottom)
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};
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/*
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* 5. Ensure that the node will be positioned relatively to the parent node
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*/
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var parentPosition = parentComputedStyle.position;
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if (parentPosition != 'absolute' && parentPosition != 'relative') {
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parentNode.style.position = 'relative';
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}
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/*
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* 6. Recalc node position.
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* It’s important to do this before clone injection to avoid scrolling bug in Chrome.
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*/
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this._recalcPosition();
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/*
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* 7. Create a clone
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*/
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var clone = this._clone = {};
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clone.node = document.createElement('div');
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// Apply styles to the clone
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extend(clone.node.style, {
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width: nodeWinOffset.right - nodeWinOffset.left + 'px',
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height: nodeWinOffset.bottom - nodeWinOffset.top + 'px',
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marginTop: nodeComputedProps.marginTop,
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marginBottom: nodeComputedProps.marginBottom,
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marginLeft: nodeComputedProps.marginLeft,
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marginRight: nodeComputedProps.marginRight,
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cssFloat: nodeComputedProps.cssFloat,
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padding: 0,
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border: 0,
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borderSpacing: 0,
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fontSize: '1em',
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position: 'static'
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});
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referenceNode.insertBefore(clone.node, node);
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clone.docOffsetTop = getDocOffsetTop(clone.node);
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}
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}, {
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key: '_recalcPosition',
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value: function _recalcPosition() {
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if (!this._active || this._removed) return;
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var stickyMode = scroll.top <= this._limits.start ? 'start' : scroll.top >= this._limits.end ? 'end' : 'middle';
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if (this._stickyMode == stickyMode) return;
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switch (stickyMode) {
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case 'start':
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extend(this._node.style, {
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position: 'absolute',
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left: this._offsetToParent.left + 'px',
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right: this._offsetToParent.right + 'px',
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top: this._offsetToParent.top + 'px',
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bottom: 'auto',
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width: 'auto',
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marginLeft: 0,
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marginRight: 0,
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marginTop: 0
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});
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break;
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case 'middle':
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extend(this._node.style, {
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position: 'fixed',
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left: this._offsetToWindow.left + 'px',
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right: this._offsetToWindow.right + 'px',
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top: this._styles.top,
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bottom: 'auto',
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width: 'auto',
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marginLeft: 0,
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marginRight: 0,
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marginTop: 0
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});
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break;
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case 'end':
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extend(this._node.style, {
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position: 'absolute',
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left: this._offsetToParent.left + 'px',
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right: this._offsetToParent.right + 'px',
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top: 'auto',
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bottom: 0,
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width: 'auto',
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marginLeft: 0,
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marginRight: 0
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});
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break;
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}
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this._stickyMode = stickyMode;
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}
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}, {
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key: '_fastCheck',
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value: function _fastCheck() {
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if (!this._active || this._removed) return;
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if (Math.abs(getDocOffsetTop(this._clone.node) - this._clone.docOffsetTop) > 1 || Math.abs(this._parent.node.offsetHeight - this._parent.offsetHeight) > 1) this.refresh();
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}
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}, {
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key: '_deactivate',
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value: function _deactivate() {
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var _this = this;
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if (!this._active || this._removed) return;
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this._clone.node.parentNode.removeChild(this._clone.node);
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delete this._clone;
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extend(this._node.style, this._styles);
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delete this._styles;
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// Check whether element’s parent node is used by other stickies.
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// If not, restore parent node’s styles.
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if (!stickies.some(function (sticky) {
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return sticky !== _this && sticky._parent && sticky._parent.node === _this._parent.node;
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})) {
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extend(this._parent.node.style, this._parent.styles);
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}
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delete this._parent;
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this._stickyMode = null;
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this._active = false;
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delete this._offsetToWindow;
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delete this._offsetToParent;
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delete this._limits;
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}
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}, {
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key: 'remove',
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value: function remove() {
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var _this2 = this;
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this._deactivate();
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stickies.some(function (sticky, index) {
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if (sticky._node === _this2._node) {
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stickies.splice(index, 1);
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return true;
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}
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});
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this._removed = true;
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}
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}]);
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return Sticky;
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}();
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/*
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* 5. Stickyfill API
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*/
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var Stickyfill = {
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stickies: stickies,
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Sticky: Sticky,
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forceSticky: function forceSticky() {
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seppuku = false;
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init();
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this.refreshAll();
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},
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addOne: function addOne(node) {
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// Check whether it’s a node
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if (!(node instanceof HTMLElement)) {
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// Maybe it’s a node list of some sort?
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// Take first node from the list then
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if (node.length && node[0]) node = node[0];else return;
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}
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// Check if Stickyfill is already applied to the node
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// and return existing sticky
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for (var i = 0; i < stickies.length; i++) {
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if (stickies[i]._node === node) return stickies[i];
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}
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// Create and return new sticky
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return new Sticky(node);
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},
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add: function add(nodeList) {
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// If it’s a node make an array of one node
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if (nodeList instanceof HTMLElement) nodeList = [nodeList];
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// Check if the argument is an iterable of some sort
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if (!nodeList.length) return;
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// Add every element as a sticky and return an array of created Sticky instances
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var addedStickies = [];
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var _loop = function _loop(i) {
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var node = nodeList[i];
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// If it’s not an HTMLElement – create an empty element to preserve 1-to-1
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// correlation with input list
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if (!(node instanceof HTMLElement)) {
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addedStickies.push(void 0);
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return 'continue';
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}
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// If Stickyfill is already applied to the node
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// add existing sticky
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if (stickies.some(function (sticky) {
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if (sticky._node === node) {
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addedStickies.push(sticky);
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return true;
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}
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})) return 'continue';
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// Create and add new sticky
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addedStickies.push(new Sticky(node));
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};
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for (var i = 0; i < nodeList.length; i++) {
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var _ret2 = _loop(i);
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if (_ret2 === 'continue') continue;
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}
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return addedStickies;
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},
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refreshAll: function refreshAll() {
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stickies.forEach(function (sticky) {
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return sticky.refresh();
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});
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},
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removeOne: function removeOne(node) {
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// Check whether it’s a node
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if (!(node instanceof HTMLElement)) {
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// Maybe it’s a node list of some sort?
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// Take first node from the list then
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if (node.length && node[0]) node = node[0];else return;
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}
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// Remove the stickies bound to the nodes in the list
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stickies.some(function (sticky) {
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if (sticky._node === node) {
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sticky.remove();
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return true;
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}
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});
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},
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remove: function remove(nodeList) {
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// If it’s a node make an array of one node
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if (nodeList instanceof HTMLElement) nodeList = [nodeList];
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// Check if the argument is an iterable of some sort
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if (!nodeList.length) return;
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// Remove the stickies bound to the nodes in the list
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var _loop2 = function _loop2(i) {
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var node = nodeList[i];
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stickies.some(function (sticky) {
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if (sticky._node === node) {
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sticky.remove();
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return true;
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}
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});
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};
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for (var i = 0; i < nodeList.length; i++) {
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_loop2(i);
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}
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},
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removeAll: function removeAll() {
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while (stickies.length) {
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stickies[0].remove();
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}
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}
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};
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/*
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* 6. Setup events (unless the polyfill was disabled)
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*/
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function init() {
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if (isInitialized) {
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return;
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}
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isInitialized = true;
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// Watch for scroll position changes and trigger recalc/refresh if needed
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function checkScroll() {
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if (window.pageXOffset != scroll.left) {
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scroll.top = window.pageYOffset;
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scroll.left = window.pageXOffset;
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Stickyfill.refreshAll();
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} else if (window.pageYOffset != scroll.top) {
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scroll.top = window.pageYOffset;
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scroll.left = window.pageXOffset;
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// recalc position for all stickies
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stickies.forEach(function (sticky) {
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return sticky._recalcPosition();
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});
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}
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}
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checkScroll();
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window.addEventListener('scroll', checkScroll);
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// Watch for window resizes and device orientation changes and trigger refresh
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window.addEventListener('resize', Stickyfill.refreshAll);
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window.addEventListener('orientationchange', Stickyfill.refreshAll);
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//Fast dirty check for layout changes every 500ms
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var fastCheckTimer = void 0;
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function startFastCheckTimer() {
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fastCheckTimer = setInterval(function () {
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stickies.forEach(function (sticky) {
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return sticky._fastCheck();
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});
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}, 500);
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}
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function stopFastCheckTimer() {
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clearInterval(fastCheckTimer);
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}
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var docHiddenKey = void 0;
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var visibilityChangeEventName = void 0;
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if ('hidden' in document) {
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docHiddenKey = 'hidden';
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visibilityChangeEventName = 'visibilitychange';
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} else if ('webkitHidden' in document) {
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docHiddenKey = 'webkitHidden';
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visibilityChangeEventName = 'webkitvisibilitychange';
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}
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if (visibilityChangeEventName) {
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if (!document[docHiddenKey]) startFastCheckTimer();
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document.addEventListener(visibilityChangeEventName, function () {
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if (document[docHiddenKey]) {
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stopFastCheckTimer();
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} else {
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startFastCheckTimer();
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}
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});
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} else startFastCheckTimer();
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}
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if (!seppuku) init();
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/*
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* 7. Expose Stickyfill
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*/
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if (typeof module != 'undefined' && module.exports) {
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module.exports = Stickyfill;
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} else if (isWindowDefined) {
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window.Stickyfill = Stickyfill;
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}
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})(window, document); |
