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49 lines
1.6 KiB
JavaScript
49 lines
1.6 KiB
JavaScript
/*!
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* AnchorJS - v0.1.0 - 2014-08-17
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* https://github.com/bryanbraun/anchorjs
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* Copyright (c) 2014 Bryan Braun; Licensed MIT
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*/
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function addAnchors(selector) {
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'use strict';
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// Sensible default selector, if none is provided.
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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('AnchorJS accepts only strings; you used a ' + typeof selector);
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}
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// Select any elements that match the provided selector.
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var elements = document.querySelectorAll(selector);
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// Loop through the selected elements.
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for (var i = 0; i < elements.length; i++) {
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var elementID;
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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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// We need to create an ID on our element. First, we find which text selection method is available to the browser.
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var textMethod = document.body.textContent ? 'textContent' : 'innerText';
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// Get the text inside our element
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var roughText = elements[i][textMethod];
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// Refine it so it makes a good ID. Makes all lowercase and hyphen separated.
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// Ex. Hello World > hello-world
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var tidyText = roughText.replace(/\s+/g, '-').toLowerCase();
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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', tidyText);
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// Grab it for use in our anchor.
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elementID = tidyText;
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}
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var anchor = '<a class="anchorjs-link" href="#' + elementID + '"><span class="anchorjs-icon"></span></a>';
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elements[i].innerHTML += anchor;
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}
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}
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