doc/assets/anchor.js
/*!
* AnchorJS - v1.2.1 - 2015-07-02
* https://github.com/bryanbraun/anchorjs
* Copyright (c) 2015 Bryan Braun; Licensed MIT
*/
function AnchorJS(options) {
'use strict';
this.options = options || {};
this._applyRemainingDefaultOptions = function(opts) {
this.options.icon = this.options.hasOwnProperty('icon') ? opts.icon : '\ue9cb'; // Accepts characters (and also URLs?), like '#', '¶', '❡', or '§'.
this.options.visible = this.options.hasOwnProperty('visible') ? opts.visible : 'hover'; // Also accepts 'always'
this.options.placement = this.options.hasOwnProperty('placement') ? opts.placement : 'right'; // Also accepts 'left'
this.options.class = this.options.hasOwnProperty('class') ? opts.class : ''; // Accepts any class name.
};
this._applyRemainingDefaultOptions(options);
this.add = function(selector) {
var elements,
elsWithIds,
idList,
elementID,
i,
roughText,
tidyText,
index,
count,
newTidyText,
readableID,
anchor;
this._applyRemainingDefaultOptions(this.options);
// Provide a sensible default selector, if none is given.
if (!selector) {
selector = 'h1, h2, h3, h4, h5, h6';
} else if (typeof selector !== 'string') {
throw new Error('The selector provided to AnchorJS was invalid.');
}
elements = document.querySelectorAll(selector);
if (elements.length === 0) {
return false;
}
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 (elements[i].hasAttribute('id')) {
elementID = elements[i].getAttribute('id');
} else {
roughText = elements[i].textContent;
// Refine it so it makes a good ID. Strip out non-safe characters, replace
// spaces with hyphens, truncate to 32 characters, and make toLowerCase.
//
// Example string: // '⚡⚡⚡ Unicode icons are cool--but they definitely don't belong in a URL fragment.'
tidyText = roughText.replace(/[^\w\s-]/gi, '') // ' Unicode icons are cool--but they definitely dont belong in a URL fragment'
.replace(/\s+/g, '-') // '-Unicode-icons-are-cool--but-they-definitely-dont-belong-in-a-URL-fragment'
.replace(/-{2,}/g, '-') // '-Unicode-icons-are-cool-but-they-definitely-dont-belong-in-a-URL-fragment'
.substring(0, 64) // '-Unicode-icons-are-cool-but-they-definitely-dont-belong-in-a-URL'
.replace(/^-+|-+$/gm, '') // 'Unicode-icons-are-cool-but-they-definitely-dont-belong-in-a-URL'
.toLowerCase(); // 'unicode-icons-are-cool-but-they-definitely-dont-belong-in-a-url'
// 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;
}
// .indexOf is supported in IE9+.
index = idList.indexOf(newTidyText);
count += 1;
} while (index !== -1);
index = undefined;
idList.push(newTidyText);
// Assign it to our element.
// Currently the setAttribute element is only supported in IE9 and above.
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 (this.options.visible === 'always') {
anchor.style.opacity = '1';
}
if (this.options.icon === '\ue9cb') {
anchor.style.fontFamily = 'anchorjs-icons';
anchor.style.fontStyle = 'normal';
anchor.style.fontVariant = 'normal';
anchor.style.fontWeight = 'normal';
anchor.style.lineHeight = 1;
}
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);
}
}
return this;
};
this.remove = function(selector) {
var domAnchor,
elements = document.querySelectorAll(selector);
for (var i = 0; i < elements.length; i++) {
domAnchor = elements[i].querySelector('.anchorjs-link');
if (domAnchor) {
elements[i].removeChild(domAnchor);
}
}
return this;
};
this._addBaselineStyles = function() {
// 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";' +
' font-style: normal;' +
' font-weight: normal;' + // Icon from icomoon; 10px wide & 10px tall; 2 empty below & 4 above
' src: url(data:application/x-font-ttf;charset=utf-8;base64,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) 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);
};
}
var anchors = new AnchorJS();