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// Except as noted, this content is licensed under Creative Commons
// Attribution 3.0
/* A little code to ease navigation of these documents.
*
* On window load we:
* + Generate a table of contents (godocs_generateTOC)
* + Add links up to the top of the doc from each section (godocs_addTopLinks)
*/
/* We want to do some stuff on page load (after the HTML is rendered).
So listen for that:
*/
function bindEvent(el, e, fn) {
if (el.addEventListener){
el.addEventListener(e, fn, false);
} else if (el.attachEvent){
el.attachEvent('on'+e, fn);
}
}
bindEvent(window, 'load', godocs_onload);
function godocs_onload() {
godocs_bindSearchEvents();
godocs_generateTOC();
godocs_addTopLinks();
godocs_bindExampleToggles();
}
function godocs_bindSearchEvents() {
var search = document.getElementById('search');
if (!search) {
// no search box (index disabled)
return;
}
function clearInactive() {
if (search.className == "inactive") {
search.value = "";
search.className = "";
}
}
function restoreInactive() {
if (search.value != "") {
return;
}
if (search.type != "search") {
search.value = search.getAttribute("placeholder");
}
search.className = "inactive";
}
restoreInactive();
bindEvent(search, 'focus', clearInactive);
bindEvent(search, 'blur', restoreInactive);
}
/* Generates a table of contents: looks for h2 and h3 elements and generates
* links. "Decorates" the element with id=="nav" with this table of contents.
*/
function godocs_generateTOC() {
var navbar = document.getElementById('nav');
if (!navbar) { return; }
var toc_items = [];
var i;
for (i = 0; i < navbar.parentNode.childNodes.length; i++) {
var node = navbar.parentNode.childNodes[i];
if ((node.tagName == 'h2') || (node.tagName == 'H2')) {
if (!node.id) {
node.id = 'tmp_' + i;
}
var text = godocs_nodeToText(node);
if (!text) { continue; }
var textNode = document.createTextNode(text);
var link = document.createElement('a');
link.href = '#' + node.id;
link.appendChild(textNode);
// Then create the item itself
var item = document.createElement('dt');
item.appendChild(link);
toc_items.push(item);
}
if ((node.tagName == 'h3') || (node.tagName == 'H3')) {
if (!node.id) {
node.id = 'tmp_' + i;
}
var text = godocs_nodeToText(node);
if (!text) { continue; }
var textNode = document.createTextNode(text);
var link = document.createElement('a');
link.href = '#' + node.id;
link.appendChild(textNode);
// Then create the item itself
var item = document.createElement('dd');
item.appendChild(link);
toc_items.push(item);
}
}
if (toc_items.length <= 1) { return; }
var dl1 = document.createElement('dl');
var dl2 = document.createElement('dl');
var split_index = (toc_items.length / 2) + 1;
if (split_index < 8) {
split_index = toc_items.length;
}
for (i = 0; i < split_index; i++) {
dl1.appendChild(toc_items[i]);
}
for (/* keep using i */; i < toc_items.length; i++) {
dl2.appendChild(toc_items[i]);
}
var tocTable = document.createElement('table');
navbar.appendChild(tocTable);
tocTable.className = 'unruled';
var tocBody = document.createElement('tbody');
tocTable.appendChild(tocBody);
var tocRow = document.createElement('tr');
tocBody.appendChild(tocRow);
// 1st column
var tocCell = document.createElement('td');
tocCell.className = 'first';
tocRow.appendChild(tocCell);
tocCell.appendChild(dl1);
// 2nd column
tocCell = document.createElement('td');
tocRow.appendChild(tocCell);
tocCell.appendChild(dl2);
}
/* Returns the "This sweet header" from <h2>This <i>sweet</i> header</h2>.
* Takes a node, returns a string.
*/
function godocs_nodeToText(node) {
var TEXT_NODE = 3; // Defined in Mozilla but not MSIE :(
var text = '';
for (var j = 0; j != node.childNodes.length; j++) {
var child = node.childNodes[j];
if (child.nodeType == TEXT_NODE) {
if (child.nodeValue != '[Top]') { //ok, that's a hack, but it works.
text = text + child.nodeValue;
}
} else {
text = text + godocs_nodeToText(child);
}
}
return text;
}
/* For each H2 heading, add a link up to the #top of the document.
* (As part of this: ensure existence of 'top' named anchor link
* (theoretically at doc's top).)
*/
function godocs_addTopLinks() {
/* Make sure there's a "top" to link to. */
var top = document.getElementById('top');
if (!top) {
document.body.id = 'top';
}
if (!document.getElementsByTagName) return; // no browser support
var headers = document.getElementsByTagName('h2');
for (var i = 0; i < headers.length; i++) {
var span = document.createElement('span');
span.className = 'navtop';
var link = document.createElement('a');
span.appendChild(link);
link.href = '#top';
var textNode = document.createTextNode('[Top]');
link.appendChild(textNode);
headers[i].appendChild(span);
}
}
function godocs_bindExampleToggles() {
var examples = document.getElementsByClassName("example");
for (var i = 0; i < examples.length; i++) {
var eg = examples[i];
godocs_bindExampleToggle(eg);
}
}
function godocs_bindExampleToggle(eg) {
var heading = eg.getElementsByClassName("exampleHeading");
for (var i = 0; i < heading.length; i++) {
bindEvent(heading[i], "click", function() {
if (eg.className == "example") {
eg.className = "exampleVisible";
} else {
eg.className = "example";
}
});
}
}
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