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(function (window, document) {
"use strict";
var tabs = {};
function changeElementClass(element, classValue) {
if (element.getAttribute("className")) {
element.setAttribute("className", classValue);
} else {
element.setAttribute("class", classValue);
}
}
function getClassAttribute(element) {
if (element.getAttribute("className")) {
return element.getAttribute("className");
} else {
return element.getAttribute("class");
}
}
function addClass(element, classValue) {
changeElementClass(element, getClassAttribute(element) + " " + classValue);
}
function removeClass(element, classValue) {
changeElementClass(element, getClassAttribute(element).replace(classValue, ""));
}
function initTabs() {
var container = document.getElementById("tabs");
tabs.tabs = findTabs(container);
tabs.titles = findTitles(tabs.tabs);
tabs.headers = findHeaders(container);
tabs.select = select;
tabs.deselectAll = deselectAll;
tabs.select(0);
return true;
}
function getCheckBox() {
return document.getElementById("line-wrapping-toggle");
}
function getLabelForCheckBox() {
return document.getElementById("label-for-line-wrapping-toggle");
}
function findCodeBlocks() {
var spans = document.getElementById("tabs").getElementsByTagName("span");
var codeBlocks = [];
for (var i = 0; i < spans.length; ++i) {
if (spans[i].className.indexOf("code") >= 0) {
codeBlocks.push(spans[i]);
}
}
return codeBlocks;
}
function forAllCodeBlocks(operation) {
var codeBlocks = findCodeBlocks();
for (var i = 0; i < codeBlocks.length; ++i) {
operation(codeBlocks[i], "wrapped");
}
}
function toggleLineWrapping() {
var checkBox = getCheckBox();
if (checkBox.checked) {
forAllCodeBlocks(addClass);
} else {
forAllCodeBlocks(removeClass);
}
}
function initControls() {
if (findCodeBlocks().length > 0) {
var checkBox = getCheckBox();
var label = getLabelForCheckBox();
checkBox.onclick = toggleLineWrapping;
checkBox.checked = false;
removeClass(label, "hidden");
}
}
function switchTab() {
var id = this.id.substr(1);
for (var i = 0; i < tabs.tabs.length; i++) {
if (tabs.tabs[i].id === id) {
tabs.select(i);
break;
}
}
return false;
}
function select(i) {
this.deselectAll();
changeElementClass(this.tabs[i], "tab selected");
changeElementClass(this.headers[i], "selected");
while (this.headers[i].firstChild) {
this.headers[i].removeChild(this.headers[i].firstChild);
}
var h2 = document.createElement("H2");
h2.appendChild(document.createTextNode(this.titles[i]));
this.headers[i].appendChild(h2);
}
function deselectAll() {
for (var i = 0; i < this.tabs.length; i++) {
changeElementClass(this.tabs[i], "tab deselected");
changeElementClass(this.headers[i], "deselected");
while (this.headers[i].firstChild) {
this.headers[i].removeChild(this.headers[i].firstChild);
}
var a = document.createElement("A");
a.setAttribute("id", "ltab" + i);
a.setAttribute("href", "#tab" + i);
a.onclick = switchTab;
a.appendChild(document.createTextNode(this.titles[i]));
this.headers[i].appendChild(a);
}
}
function findTabs(container) {
return findChildElements(container, "DIV", "tab");
}
function findHeaders(container) {
var owner = findChildElements(container, "UL", "tabLinks");
return findChildElements(owner[0], "LI", null);
}
function findTitles(tabs) {
var titles = [];
for (var i = 0; i < tabs.length; i++) {
var tab = tabs[i];
var header = findChildElements(tab, "H2", null)[0];
header.parentNode.removeChild(header);
if (header.innerText) {
titles.push(header.innerText);
} else {
titles.push(header.textContent);
}
}
return titles;
}
function findChildElements(container, name, targetClass) {
var elements = [];
var children = container.childNodes;
for (var i = 0; i < children.length; i++) {
var child = children.item(i);
if (child.nodeType === 1 && child.nodeName === name) {
if (targetClass && child.className.indexOf(targetClass) < 0) {
continue;
}
elements.push(child);
}
}
return elements;
}
// Entry point.
window.onload = function() {
initTabs();
initControls();
};
} (window, window.document));
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