70 lines
2.1 KiB
JavaScript
70 lines
2.1 KiB
JavaScript
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/* Author: Mihai Bazon, September 2002
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* http://students.infoiasi.ro/~mishoo
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*
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* Table Of Content generator
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* Version: 0.4
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*
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* Feel free to use this script under the terms of the GNU General Public
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* License, as long as you do not remove or alter this notice.
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*/
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/* modified by Troy D. Hanson, September 2006. License: GPL */
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/* modified by Stuart Rackham, October 2006. License: GPL */
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function getText(el) {
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var text = "";
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for (var i = el.firstChild; i != null; i = i.nextSibling) {
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if (i.nodeType == 3 /* Node.TEXT_NODE */) // IE doesn't speak constants.
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text += i.data;
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else if (i.firstChild != null)
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text += getText(i);
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}
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return text;
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}
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function TocEntry(el, text, toclevel) {
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this.element = el;
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this.text = text;
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this.toclevel = toclevel;
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}
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function tocEntries(el, toclevels) {
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var result = new Array;
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var re = new RegExp('[hH]([2-'+(toclevels+1)+'])');
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// Function that scans the DOM tree for header elements (the DOM2
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// nodeIterator API would be a better technique but not supported by all
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// browsers).
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var iterate = function (el) {
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for (var i = el.firstChild; i != null; i = i.nextSibling) {
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if (i.nodeType == 1 /* Node.ELEMENT_NODE */) {
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var mo = re.exec(i.tagName)
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if (mo)
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result[result.length] = new TocEntry(i, getText(i), mo[1]-1);
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iterate(i);
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}
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}
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}
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iterate(el);
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return result;
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}
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// This function does the work. toclevels = 1..4.
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function generateToc(toclevels) {
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var toc = document.getElementById("toc");
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var entries = tocEntries(document.getElementsByTagName("body")[0], toclevels);
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for (var i = 0; i < entries.length; ++i) {
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var entry = entries[i];
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if (entry.element.id == "")
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entry.element.id = "toc" + i;
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var a = document.createElement("a");
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a.href = "#" + entry.element.id;
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a.appendChild(document.createTextNode(entry.text));
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var div = document.createElement("div");
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div.appendChild(a);
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div.className = "toclevel" + entry.toclevel;
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toc.appendChild(div);
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}
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if (entries.length == 0)
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document.getElementById("header").removeChild(toc);
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}
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