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1 // Kludge in HTML5 tag recognition in IE8
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2 document.createElement("section");
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3 document.createElement("article");
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4
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5 (function() {
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6 if (!window.addEventListener) return;
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7 var pending = false, prevVal = null;
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8
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9 function updateSoon() {
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10 if (!pending) {
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11 pending = true;
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12 setTimeout(update, 250);
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13 }
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14 }
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15
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16 function update() {
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17 pending = false;
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18 var marks = document.getElementById("nav").getElementsByTagName("a"), found;
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19 for (var i = 0; i < marks.length; ++i) {
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20 var mark = marks[i], m;
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21 if (mark.getAttribute("data-default")) {
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22 if (found == null) found = i;
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23 } else if (m = mark.href.match(/#(.*)/)) {
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24 var ref = document.getElementById(m[1]);
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25 if (ref && ref.getBoundingClientRect().top < 50)
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26 found = i;
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27 }
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28 }
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29 if (found != null && found != prevVal) {
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30 prevVal = found;
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31 var lis = document.getElementById("nav").getElementsByTagName("li");
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32 for (var i = 0; i < lis.length; ++i) lis[i].className = "";
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33 for (var i = 0; i < marks.length; ++i) {
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34 if (found == i) {
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35 marks[i].className = "active";
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36 for (var n = marks[i]; n; n = n.parentNode)
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37 if (n.nodeName == "LI") n.className = "active";
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38 } else {
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39 marks[i].className = "";
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40 }
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41 }
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42 }
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43 }
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44
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45 window.addEventListener("scroll", updateSoon);
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46 window.addEventListener("load", updateSoon);
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47 window.addEventListener("hashchange", function() {
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48 setTimeout(function() {
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49 var hash = document.location.hash, found = null, m;
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50 var marks = document.getElementById("nav").getElementsByTagName("a");
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51 for (var i = 0; i < marks.length; i++)
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52 if ((m = marks[i].href.match(/(#.*)/)) && m[1] == hash) { found = i; break; }
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53 if (found != null) for (var i = 0; i < marks.length; i++)
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54 marks[i].className = i == found ? "active" : "";
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55 }, 300);
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56 });
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57 })();
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