133 lines
2.9 KiB
JavaScript
133 lines
2.9 KiB
JavaScript
/**
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* Creates a table of contents inside the given element.
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*/
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function maketoc(element, enableSections)
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{
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enableSections = (enableSections != null) ? enableSections : true;
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let tmp = crawlDom(document.body, 2, 4, [], 30, enableSections);
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if (tmp.childNodes.length > 0)
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{
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element.appendChild(tmp);
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}
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}
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function crawlDom(parent, ignore, depth, chapters, indent, enableSections)
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{
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let doc = parent.ownerDocument;
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let toc = doc.createElement('ul');
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toc.style.listStyleType = 'none';
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let child = parent.firstChild;
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let lastLevel = 0;
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while (child != null)
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{
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let name = child.nodeName.toLowerCase();
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if (name.substring(0, 1) == 'h')
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{
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let tmp = name.substring(1, name.length);
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let currentLevel = parseInt(tmp);
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// Checks if rest of string is numeric and
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// header level is not beyond depth
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if (currentLevel == tmp && (depth == 0 || currentLevel <= depth))
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{
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// Deletes chapter numbers which are no longer used
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if (currentLevel < lastLevel)
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{
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chapters = chapters.slice(0, currentLevel + 1);
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}
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lastLevel = currentLevel;
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if (ignore <= 0)
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{
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if (chapters[currentLevel] == null)
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{
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chapters[currentLevel] = 0;
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}
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chapters[currentLevel]++;
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let sect = '';
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for (let i = 0; i < chapters.length; i++)
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{
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if (chapters[i] != null)
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{
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sect += chapters[i] + '.';
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}
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}
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let tmp = child.firstChild;
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while (tmp != null &&
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tmp.nodeType != 3)
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{
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tmp = tmp.nextSibling;
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}
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if (tmp != null)
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{
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sect = sect.substring(0, sect.length - 1);
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let title = tmp.nodeValue;
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let anchor = null;
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if (navigator.userAgent.indexOf('MSIE') >= 0)
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{
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// Setting the name tag here is a workaround for IE which sets the
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// submitName attribute instead when using setAttribute('name', sect)
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anchor = doc.createElement('<a name="'+sect+'"></a>');
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}
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else
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{
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anchor = doc.createElement('a');
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anchor.setAttribute('name', sect);
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}
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if (enableSections)
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{
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anchor.appendChild(doc.createTextNode(sect+' '));
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}
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child.insertBefore(anchor, tmp);
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// Adds entry in the table of contents
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let listItem = doc.createElement('li');
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listItem.style.paddingLeft = ((currentLevel - 1) * indent) + 'px';
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var anchor2 = doc.createElement('a');
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anchor2.setAttribute('href', '#'+sect);
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if (enableSections)
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{
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anchor2.appendChild(doc.createTextNode(sect + ' ' + title));
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}
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else
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{
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anchor2.appendChild(doc.createTextNode(title));
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}
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listItem.appendChild(anchor2);
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toc.appendChild(listItem);
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}
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}
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else
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{
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ignore--;
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}
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}
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}
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let tmp = crawlDom(child, 0, depth, chapters, indent);
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if (tmp.childNodes.length > 0)
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{
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toc.appendChild(tmp);
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}
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child = child.nextSibling;
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}
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return toc;
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}
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