58 lines
1.9 KiB
JavaScript
58 lines
1.9 KiB
JavaScript
// Kludge in HTML5 tag recognition in IE8
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document.createElement("section");
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document.createElement("article");
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(function() {
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if (!window.addEventListener) return;
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var pending = false, prevVal = null;
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function updateSoon() {
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if (!pending) {
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pending = true;
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setTimeout(update, 250);
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}
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}
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function update() {
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pending = false;
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var marks = document.getElementById("nav").getElementsByTagName("a"), found;
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for (var i = 0; i < marks.length; ++i) {
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var mark = marks[i], m;
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if (mark.getAttribute("data-default")) {
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if (found == null) found = i;
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} else if (m = mark.href.match(/#(.*)/)) {
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var ref = document.getElementById(m[1]);
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if (ref && ref.getBoundingClientRect().top < 50)
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found = i;
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}
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}
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if (found != null && found != prevVal) {
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prevVal = found;
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var lis = document.getElementById("nav").getElementsByTagName("li");
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for (var i = 0; i < lis.length; ++i) lis[i].className = "";
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for (var i = 0; i < marks.length; ++i) {
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if (found == i) {
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marks[i].className = "active";
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for (var n = marks[i]; n; n = n.parentNode)
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if (n.nodeName == "LI") n.className = "active";
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} else {
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marks[i].className = "";
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}
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}
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}
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}
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window.addEventListener("scroll", updateSoon);
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window.addEventListener("load", updateSoon);
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window.addEventListener("hashchange", function() {
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setTimeout(function() {
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var hash = document.location.hash, found = null, m;
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var marks = document.getElementById("nav").getElementsByTagName("a");
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for (var i = 0; i < marks.length; i++)
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if ((m = marks[i].href.match(/(#.*)/)) && m[1] == hash) { found = i; break; }
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if (found != null) for (var i = 0; i < marks.length; i++)
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marks[i].className = i == found ? "active" : "";
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}, 300);
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});
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})();
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