/*!
* AnchorJS - v4.0.0 - 2017-06-02
* https://github.com/bryanbraun/anchorjs
* Copyright (c) 2017 Bryan Braun; Licensed MIT
*/
/* eslint-env amd, node */
// https://github.com/umdjs/umd/blob/master/templates/returnExports.js
(function(root, factory) {
'use strict';
if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module.
define([], factory);
} else if (typeof module === 'object' && module.exports) {
// Node. Does not work with strict CommonJS, but
// only CommonJS-like environments that support module.exports,
// like Node.
module.exports = factory();
} else {
// Browser globals (root is window)
root.AnchorJS = factory();
root.anchors = new root.AnchorJS();
}
})(this, function() {
'use strict';
function AnchorJS(options) {
this.options = options || {};
this.elements = [];
/**
* Assigns options to the internal options object, and provides defaults.
* @param {Object} opts - Options object
*/
function _applyRemainingDefaultOptions(opts) {
opts.icon = opts.hasOwnProperty('icon') ? opts.icon : '\ue9cb'; // Accepts characters (and also URLs?), like '#', '¶', '❡', or '§'.
opts.visible = opts.hasOwnProperty('visible') ? opts.visible : 'hover'; // Also accepts 'always' & 'touch'
opts.placement = opts.hasOwnProperty('placement')
? opts.placement
: 'right'; // Also accepts 'left'
opts.class = opts.hasOwnProperty('class') ? opts.class : ''; // Accepts any class name.
// Using Math.floor here will ensure the value is Number-cast and an integer.
opts.truncate = opts.hasOwnProperty('truncate')
? Math.floor(opts.truncate)
: 64; // Accepts any value that can be typecast to a number.
}
_applyRemainingDefaultOptions(this.options);
/**
* Checks to see if this device supports touch. Uses criteria pulled from Modernizr:
* https://github.com/Modernizr/Modernizr/blob/da22eb27631fc4957f67607fe6042e85c0a84656/feature-detects/touchevents.js#L40
* @returns {Boolean} - true if the current device supports touch.
*/
this.isTouchDevice = function() {
return !!(
'ontouchstart' in window ||
(window.DocumentTouch && document instanceof DocumentTouch)
);
};
/**
* Add anchor links to page elements.
* @param {String|Array|Nodelist} selector - A CSS selector for targeting the elements you wish to add anchor links
* to. Also accepts an array or nodeList containing the relavant elements.
* @returns {this} - The AnchorJS object
*/
this.add = function(selector) {
var elements,
elsWithIds,
idList,
elementID,
i,
index,
count,
tidyText,
newTidyText,
readableID,
anchor,
visibleOptionToUse,
indexesToDrop = [];
// We reapply options here because somebody may have overwritten the default options object when setting options.
// For example, this overwrites all options but visible:
//
// anchors.options = { visible: 'always'; }
_applyRemainingDefaultOptions(this.options);
visibleOptionToUse = this.options.visible;
if (visibleOptionToUse === 'touch') {
visibleOptionToUse = this.isTouchDevice() ? 'always' : 'hover';
}
// Provide a sensible default selector, if none is given.
if (!selector) {
selector = 'h2, h3, h4, h5, h6';
}
elements = _getElements(selector);
if (elements.length === 0) {
return this;
}
_addBaselineStyles();
// We produce a list of existing IDs so we don't generate a duplicate.
elsWithIds = document.querySelectorAll('[id]');
idList = [].map.call(elsWithIds, function assign(el) {
return el.id;
});
for (i = 0; i < elements.length; i++) {
if (this.hasAnchorJSLink(elements[i])) {
indexesToDrop.push(i);
continue;
}
if (elements[i].hasAttribute('id')) {
elementID = elements[i].getAttribute('id');
} else if (elements[i].hasAttribute('data-anchor-id')) {
elementID = elements[i].getAttribute('data-anchor-id');
} else {
tidyText = this.urlify(elements[i].textContent);
// Compare our generated ID to existing IDs (and increment it if needed)
// before we add it to the page.
newTidyText = tidyText;
count = 0;
do {
if (index !== undefined) {
newTidyText = tidyText + '-' + count;
}
index = idList.indexOf(newTidyText);
count += 1;
} while (index !== -1);
index = undefined;
idList.push(newTidyText);
elements[i].setAttribute('id', newTidyText);
elementID = newTidyText;
}
readableID = elementID.replace(/-/g, ' ');
// The following code builds the following DOM structure in a more effiecient (albeit opaque) way.
// '<a class="anchorjs-link ' + this.options.class + '" href="#' + elementID + '" aria-label="Anchor link for: ' + readableID + '" data-anchorjs-icon="' + this.options.icon + '"></a>';
anchor = document.createElement('a');
anchor.className = 'anchorjs-link ' + this.options.class;
anchor.href = '#' + elementID;
anchor.setAttribute('aria-label', 'Anchor link for: ' + readableID);
anchor.setAttribute('data-anchorjs-icon', this.options.icon);
if (visibleOptionToUse === 'always') {
anchor.style.opacity = '1';
}
if (this.options.icon === '\ue9cb') {
anchor.style.font = '1em/1 anchorjs-icons';
// We set lineHeight = 1 here because the `anchorjs-icons` font family could otherwise affect the
// height of the heading. This isn't the case for icons with `placement: left`, so we restore
// line-height: inherit in that case, ensuring they remain positioned correctly. For more info,
// see https://github.com/bryanbraun/anchorjs/issues/39.
if (this.options.placement === 'left') {
anchor.style.lineHeight = 'inherit';
}
}
if (this.options.placement === 'left') {
anchor.style.position = 'absolute';
anchor.style.marginLeft = '-1em';
anchor.style.paddingRight = '0.5em';
elements[i].insertBefore(anchor, elements[i].firstChild);
} else {
// if the option provided is `right` (or anything else).
anchor.style.paddingLeft = '0.375em';
elements[i].appendChild(anchor);
}
}
for (i = 0; i < indexesToDrop.length; i++) {
elements.splice(indexesToDrop[i] - i, 1);
}
this.elements = this.elements.concat(elements);
return this;
};
/**
* Removes all anchorjs-links from elements targed by the selector.
* @param {String|Array|Nodelist} selector - A CSS selector string targeting elements with anchor links,
* OR a nodeList / array containing the DOM elements.
* @returns {this} - The AnchorJS object
*/
this.remove = function(selector) {
var index,
domAnchor,
elements = _getElements(selector);
for (var i = 0; i < elements.length; i++) {
domAnchor = elements[i].querySelector('.anchorjs-link');
if (domAnchor) {
// Drop the element from our main list, if it's in there.
index = this.elements.indexOf(elements[i]);
if (index !== -1) {
this.elements.splice(index, 1);
}
// Remove the anchor from the DOM.
elements[i].removeChild(domAnchor);
}
}
return this;
};
/**
* Removes all anchorjs links. Mostly used for tests.
*/
this.removeAll = function() {
this.remove(this.elements);
};
/**
* Urlify - Refine text so it makes a good ID.
*
* To do this, we remove apostrophes, replace nonsafe characters with hyphens,
* remove extra hyphens, truncate, trim hyphens, and make lowercase.
*
* @param {String} text - Any text. Usually pulled from the webpage element we are linking to.
* @returns {String} - hyphen-delimited text for use in IDs and URLs.
*/
this.urlify = function(text) {
// Regex for finding the nonsafe URL characters (many need escaping): & +$,:;=?@"#{}|^~[`%!'<>]./()*\
var nonsafeChars = /[& +$,:;=?@"#{}|^~[`%!'<>\]\.\/\(\)\*\\]/g,
urlText;
// The reason we include this _applyRemainingDefaultOptions is so urlify can be called independently,
// even after setting options. This can be useful for tests or other applications.
if (!this.options.truncate) {
_applyRemainingDefaultOptions(this.options);
}
// Note: we trim hyphens after truncating because truncating can cause dangling hyphens.
// Example string: // " ⚡⚡ Don't forget: URL fragments should be i18n-friendly, hyphenated, short, and clean."
urlText = text
.trim() // "⚡⚡ Don't forget: URL fragments should be i18n-friendly, hyphenated, short, and clean."
.replace(/\'/gi, '') // "⚡⚡ Dont forget: URL fragments should be i18n-friendly, hyphenated, short, and clean."
.replace(nonsafeChars, '-') // "⚡⚡-Dont-forget--URL-fragments-should-be-i18n-friendly--hyphenated--short--and-clean-"
.replace(/-{2,}/g, '-') // "⚡⚡-Dont-forget-URL-fragments-should-be-i18n-friendly-hyphenated-short-and-clean-"
.substring(0, this.options.truncate) // "⚡⚡-Dont-forget-URL-fragments-should-be-i18n-friendly-hyphenated-"
.replace(/^-+|-+$/gm, '') // "⚡⚡-Dont-forget-URL-fragments-should-be-i18n-friendly-hyphenated"
.toLowerCase(); // "⚡⚡-dont-forget-url-fragments-should-be-i18n-friendly-hyphenated"
return urlText;
};
/**
* Determines if this element already has an AnchorJS link on it.
* Uses this technique: http://stackoverflow.com/a/5898748/1154642
* @param {HTMLElemnt} el - a DOM node
* @returns {Boolean} true/false
*/
this.hasAnchorJSLink = function(el) {
var hasLeftAnchor =
el.firstChild &&
(' ' + el.firstChild.className + ' ').indexOf(' anchorjs-link ') > -1,
hasRightAnchor =
el.lastChild &&
(' ' + el.lastChild.className + ' ').indexOf(' anchorjs-link ') > -1;
return hasLeftAnchor || hasRightAnchor || false;
};
/**
* Turns a selector, nodeList, or array of elements into an array of elements (so we can use array methods).
* It also throws errors on any other inputs. Used to handle inputs to .add and .remove.
* @param {String|Array|Nodelist} input - A CSS selector string targeting elements with anchor links,
* OR a nodeList / array containing the DOM elements.
* @returns {Array} - An array containing the elements we want.
*/
function _getElements(input) {
var elements;
if (typeof input === 'string' || input instanceof String) {
// See https://davidwalsh.name/nodelist-array for the technique transforming nodeList -> Array.
elements = [].slice.call(document.querySelectorAll(input));
// I checked the 'input instanceof NodeList' test in IE9 and modern browsers and it worked for me.
} else if (Array.isArray(input) || input instanceof NodeList) {
elements = [].slice.call(input);
} else {
throw new Error('The selector provided to AnchorJS was invalid.');
}
return elements;
}
/**
* _addBaselineStyles
* Adds baseline styles to the page, used by all AnchorJS links irregardless of configuration.
*/
function _addBaselineStyles() {
// We don't want to add global baseline styles if they've been added before.
if (document.head.querySelector('style.anchorjs') !== null) {
return;
}
var style = document.createElement('style'),
linkRule =
' .anchorjs-link {' +
' opacity: 0;' +
' text-decoration: none;' +
' -webkit-font-smoothing: antialiased;' +
' -moz-osx-font-smoothing: grayscale;' +
' }',
hoverRule =
' *:hover > .anchorjs-link,' +
' .anchorjs-link:focus {' +
' opacity: 1;' +
' }',
anchorjsLinkFontFace =
' @font-face {' +
' font-family: "anchorjs-icons";' + // Icon from icomoon; 10px wide & 10px tall; 2 empty below & 4 above
' src: url(data:n/a;base64,AAEAAAALAIAAAwAwT1MvMg8yG2cAAAE4AAAAYGNtYXDp3gC3AAABpAAAAExnYXNwAAAAEAAAA9wAAAAIZ2x5ZlQCcfwAAAH4AAABCGhlYWQHFvHyAAAAvAAAADZoaGVhBnACFwAAAPQAAAAkaG10eASAADEAAAGYAAAADGxvY2EACACEAAAB8AAAAAhtYXhwAAYAVwAAARgAAAAgbmFtZQGOH9cAAAMAAAAAunBvc3QAAwAAAAADvAAAACAAAQAAAAEAAHzE2p9fDzz1AAkEAAAAAADRecUWAAAAANQA6R8AAAAAAoACwAAAAAgAAgAAAAAAAAABAAADwP/AAAACgAAA/9MCrQABAAAAAAAAAAAAAAAAAAAAAwABAAAAAwBVAAIAAAAAAAIAAAAAAAAAAAAAAAAAAAAAAAMCQAGQAAUAAAKZAswAAACPApkCzAAAAesAMwEJAAAAAAAAAAAAAAAAAAAAARAAAAAAAAAAAAAAAAAAAAAAQAAg//0DwP/AAEADwABAAAAAAQAAAAAAAAAAAAAAIAAAAAAAAAIAAAACgAAxAAAAAwAAAAMAAAAcAAEAAwAAABwAAwABAAAAHAAEADAAAAAIAAgAAgAAACDpy//9//8AAAAg6cv//f///+EWNwADAAEAAAAAAAAAAAAAAAAACACEAAEAAAAAAAAAAAAAAAAxAAACAAQARAKAAsAAKwBUAAABIiYnJjQ3NzY2MzIWFxYUBwcGIicmNDc3NjQnJiYjIgYHBwYUFxYUBwYGIwciJicmNDc3NjIXFhQHBwYUFxYWMzI2Nzc2NCcmNDc2MhcWFAcHBgYjARQGDAUtLXoWOR8fORYtLTgKGwoKCjgaGg0gEhIgDXoaGgkJBQwHdR85Fi0tOAobCgoKOBoaDSASEiANehoaCQkKGwotLXoWOR8BMwUFLYEuehYXFxYugC44CQkKGwo4GkoaDQ0NDXoaShoKGwoFBe8XFi6ALjgJCQobCjgaShoNDQ0NehpKGgobCgoKLYEuehYXAAAADACWAAEAAAAAAAEACAAAAAEAAAAAAAIAAwAIAAEAAAAAAAMACAAAAAEAAAAAAAQACAAAAAEAAAAAAAUAAQALAAEAAAAAAAYACAAAAAMAAQQJAAEAEAAMAAMAAQQJAAIABgAcAAMAAQQJAAMAEAAMAAMAAQQJAAQAEAAMAAMAAQQJAAUAAgAiAAMAAQQJAAYAEAAMYW5jaG9yanM0MDBAAGEAbgBjAGgAbwByAGoAcwA0ADAAMABAAAAAAwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABAAH//wAP) format("truetype");' +
' }',
pseudoElContent =
' [data-anchorjs-icon]::after {' +
' content: attr(data-anchorjs-icon);' +
' }',
firstStyleEl;
style.className = 'anchorjs';
style.appendChild(document.createTextNode('')); // Necessary for Webkit.
// We place it in the head with the other style tags, if possible, so as to
// not look out of place. We insert before the others so these styles can be
// overridden if necessary.
firstStyleEl = document.head.querySelector('[rel="stylesheet"], style');
if (firstStyleEl === undefined) {
document.head.appendChild(style);
} else {
document.head.insertBefore(style, firstStyleEl);
}
style.sheet.insertRule(linkRule, style.sheet.cssRules.length);
style.sheet.insertRule(hoverRule, style.sheet.cssRules.length);
style.sheet.insertRule(pseudoElContent, style.sheet.cssRules.length);
style.sheet.insertRule(anchorjsLinkFontFace, style.sheet.cssRules.length);
}
}
return AnchorJS;
});