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194 lines
8.9 KiB
194 lines
8.9 KiB
/*!
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* AnchorJS - v1.2.1 - 2015-07-02
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* https://github.com/bryanbraun/anchorjs
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* Copyright (c) 2015 Bryan Braun; Licensed MIT
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*/
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function AnchorJS(options) {
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'use strict'
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this.options = options || {}
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this._applyRemainingDefaultOptions = function (opts) {
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this.options.icon = this.options.hasOwnProperty('icon') ? opts.icon : '\ue9cb' // Accepts characters (and also URLs?), like '#', '¶', '❡', or '§'.
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this.options.visible = this.options.hasOwnProperty('visible') ? opts.visible : 'hover' // Also accepts 'always'
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this.options.placement = this.options.hasOwnProperty('placement') ? opts.placement : 'right' // Also accepts 'left'
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this.options.class = this.options.hasOwnProperty('class') ? opts.class : '' // Accepts any class name.
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}
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this._applyRemainingDefaultOptions(options)
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this.add = function (selector) {
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var elements,
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elsWithIds,
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idList,
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elementID,
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i,
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roughText,
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tidyText,
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index,
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count,
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newTidyText,
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readableID,
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anchor
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this._applyRemainingDefaultOptions(this.options)
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// Provide a sensible default selector, if none is given.
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if (!selector) {
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selector = 'h1, h2, h3, h4, h5, h6'
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} else if (typeof selector !== 'string') {
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throw new Error('The selector provided to AnchorJS was invalid.')
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}
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elements = document.querySelectorAll(selector)
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if (elements.length === 0) {
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return false
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}
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this._addBaselineStyles()
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// We produce a list of existing IDs so we don't generate a duplicate.
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elsWithIds = document.querySelectorAll('[id]')
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idList = [].map.call(elsWithIds, function assign(el) {
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return el.id
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})
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for (i = 0; i < elements.length; i++) {
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if (elements[i].hasAttribute('id')) {
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elementID = elements[i].getAttribute('id')
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} else {
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roughText = elements[i].textContent
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// Refine it so it makes a good ID. Strip out non-safe characters, replace
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// spaces with hyphens, truncate to 32 characters, and make toLowerCase.
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//
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// Example string: // '⚡⚡⚡ Unicode icons are cool--but they definitely don't belong in a URL fragment.'
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tidyText = roughText
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.replace(/[^\w\s-]/gi, '') // ' Unicode icons are cool--but they definitely dont belong in a URL fragment'
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.replace(/\s+/g, '-') // '-Unicode-icons-are-cool--but-they-definitely-dont-belong-in-a-URL-fragment'
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.replace(/-{2,}/g, '-') // '-Unicode-icons-are-cool-but-they-definitely-dont-belong-in-a-URL-fragment'
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.substring(0, 64) // '-Unicode-icons-are-cool-but-they-definitely-dont-belong-in-a-URL'
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.replace(/^-+|-+$/gm, '') // 'Unicode-icons-are-cool-but-they-definitely-dont-belong-in-a-URL'
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.toLowerCase() // 'unicode-icons-are-cool-but-they-definitely-dont-belong-in-a-url'
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// Compare our generated ID to existing IDs (and increment it if needed)
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// before we add it to the page.
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newTidyText = tidyText
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count = 0
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do {
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if (index !== undefined) {
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newTidyText = tidyText + '-' + count
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}
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// .indexOf is supported in IE9+.
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index = idList.indexOf(newTidyText)
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count += 1
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} while (index !== -1)
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index = undefined
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idList.push(newTidyText)
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// Assign it to our element.
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// Currently the setAttribute element is only supported in IE9 and above.
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elements[i].setAttribute('id', newTidyText)
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elementID = newTidyText
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}
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readableID = elementID.replace(/-/g, ' ')
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// The following code builds the following DOM structure in a more effiecient (albeit opaque) way.
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// '<a class="anchorjs-link ' + this.options.class + '" href="#' + elementID + '" aria-label="Anchor link for: ' + readableID + '" data-anchorjs-icon="' + this.options.icon + '"></a>';
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anchor = document.createElement('a')
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anchor.className = 'anchorjs-link ' + this.options.class
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anchor.href = '#' + elementID
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anchor.setAttribute('aria-label', 'Anchor link for: ' + readableID)
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anchor.setAttribute('data-anchorjs-icon', this.options.icon)
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if (this.options.visible === 'always') {
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anchor.style.opacity = '1'
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}
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if (this.options.icon === '\ue9cb') {
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anchor.style.fontFamily = 'anchorjs-icons'
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anchor.style.fontStyle = 'normal'
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anchor.style.fontVariant = 'normal'
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anchor.style.fontWeight = 'normal'
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anchor.style.lineHeight = 1
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}
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if (this.options.placement === 'left') {
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anchor.style.position = 'absolute'
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anchor.style.marginLeft = '-1em'
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anchor.style.paddingRight = '0.5em'
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elements[i].insertBefore(anchor, elements[i].firstChild)
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} else {
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// if the option provided is `right` (or anything else).
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anchor.style.paddingLeft = '0.375em'
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elements[i].appendChild(anchor)
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}
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}
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return this
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}
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this.remove = function (selector) {
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var domAnchor,
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elements = document.querySelectorAll(selector)
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for (var i = 0; i < elements.length; i++) {
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domAnchor = elements[i].querySelector('.anchorjs-link')
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if (domAnchor) {
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elements[i].removeChild(domAnchor)
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}
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}
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return this
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}
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this._addBaselineStyles = function () {
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// We don't want to add global baseline styles if they've been added before.
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if (document.head.querySelector('style.anchorjs') !== null) {
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return
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}
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var style = document.createElement('style'),
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linkRule =
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' .anchorjs-link {' +
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' opacity: 0;' +
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' text-decoration: none;' +
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' -webkit-font-smoothing: antialiased;' +
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' -moz-osx-font-smoothing: grayscale;' +
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' }',
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hoverRule =
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' *:hover > .anchorjs-link,' + ' .anchorjs-link:focus {' + ' opacity: 1;' + ' }',
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anchorjsLinkFontFace =
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' @font-face {' +
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' font-family: "anchorjs-icons";' +
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' font-style: normal;' +
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' font-weight: normal;' + // Icon from icomoon; 10px wide & 10px tall; 2 empty below & 4 above
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' src: url(data:application/x-font-ttf;charset=utf-8;base64,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) format("truetype");' +
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' }',
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pseudoElContent =
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' [data-anchorjs-icon]::after {' + ' content: attr(data-anchorjs-icon);' + ' }',
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firstStyleEl
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style.className = 'anchorjs'
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style.appendChild(document.createTextNode('')) // Necessary for Webkit.
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// We place it in the head with the other style tags, if possible, so as to
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// not look out of place. We insert before the others so these styles can be
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// overridden if necessary.
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firstStyleEl = document.head.querySelector('[rel="stylesheet"], style')
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if (firstStyleEl === undefined) {
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document.head.appendChild(style)
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} else {
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document.head.insertBefore(style, firstStyleEl)
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}
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style.sheet.insertRule(linkRule, style.sheet.cssRules.length)
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style.sheet.insertRule(hoverRule, style.sheet.cssRules.length)
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style.sheet.insertRule(pseudoElContent, style.sheet.cssRules.length)
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style.sheet.insertRule(anchorjsLinkFontFace, style.sheet.cssRules.length)
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}
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}
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var anchors = new AnchorJS()
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