303 lines
9.5 KiB
JavaScript
303 lines
9.5 KiB
JavaScript
var entries = []; // list of news items
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var days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday",
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"Friday", "Saturday"];
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var months = ["January", "February", "March", "April", "May", "June", "July",
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"August", "September", "October", "November", "December"];
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// event complete: stop propagation of the event
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function stopPropagation(event) {
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if (event.preventDefault) {
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event.preventDefault();
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event.stopPropagation();
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} else {
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event.returnValue = false;
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}
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}
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// scroll back to the previous article
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function prevArticle(event) {
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var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
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for (var i=entries.length; --i>=0;) {
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if (!entries[i].anchor) continue;
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if (entries[i].anchor.offsetTop < scrollTop) {
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window.location.hash=entries[i].anchor.id;
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stopPropagation(event);
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break;
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}
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}
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}
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// advance to the next article
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function nextArticle(event) {
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var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
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for (var i=1; i<entries.length; i++) {
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if (!entries[i].anchor) continue;
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if (entries[i].anchor.offsetTop-20 >scrollTop) {
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window.location.hash=entries[i].anchor.id;
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stopPropagation(event);
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break;
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}
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}
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}
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// process keypresses
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function navkey(event) {
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var checkbox = document.getElementById('navkeys');
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if (!checkbox || !checkbox.checked) return;
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if (!event) event=window.event;
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if (event.originalTarget &&
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event.originalTarget.nodeName.toLowerCase() == 'input' &&
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event.originalTarget.id != 'navkeys') return;
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if (!document.documentElement) return;
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if (!entries[0].anchor || !entries[0].anchor.offsetTop) return;
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key=event.keyCode;
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if (key == 'J'.charCodeAt(0)) nextArticle(event);
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if (key == 'K'.charCodeAt(0)) prevArticle(event);
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}
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// create (or reset) a cookie
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function createCookie(name,value,days) {
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if (days) {
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var date = new Date();
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date.setTime(date.getTime()+(days*24*60*60*1000));
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var expires = "; expires="+date.toGMTString();
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}
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else expires = "";
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document.cookie = name+"="+value+expires+"; path=/";
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}
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// read a cookie
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function readCookie(name) {
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var nameEQ = name + "=";
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if (!document.cookie) return;
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var ca = document.cookie.split(';');
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for(var i=0;i < ca.length;i++) {
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var c = ca[i];
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while (c.charAt(0)==' ') c = c.substring(1,c.length);
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if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
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}
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return null;
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}
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// each time the value of the option changes, update the cookie
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function selectOption() {
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var checkbox = document.getElementById('navkeys');
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if (!checkbox) return;
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createCookie("navkeys", checkbox.checked?'true':'false', 365);
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}
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// add navkeys option to sidebar
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function addOption(event) {
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var sidebar = document.getElementById('sidebar');
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if (!sidebar) return;
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var h2 = null;
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for (var i=entries.length; --i>=0;) {
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if (document.getElementById("news-" + i)) break;
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if (entries[i].parent.offsetTop > 0) {
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var a = entries[i].anchor = document.createElement('a');
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a.id = "news-" + i;
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entries[i].parent.insertBefore(a, entries[i].parent.firstChild);
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if (h2 == null) h2 = document.createElement('h2');
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}
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}
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if (h2 != null && !document.getElementById("navkeys")) {
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h2.appendChild(document.createTextNode('Options'));
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sidebar.appendChild(h2);
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var form = document.createElement('form');
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var p = document.createElement('p');
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var input = document.createElement('input');
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input.type = "checkbox";
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input.id = "navkeys";
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p.appendChild(input);
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var a = document.createElement('a');
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a.title = "Navigate entries";
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a.appendChild(document.createTextNode('Enable '));
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var code = document.createElement('code');
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code.appendChild(document.createTextNode('J'));
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a.appendChild(code);
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a.appendChild(document.createTextNode(' and '));
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code = document.createElement('code');
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code.appendChild(document.createTextNode('K'));
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a.appendChild(code);
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a.appendChild(document.createTextNode(' keys'));
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p.appendChild(a);
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form.appendChild(p);
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sidebar.appendChild(form);
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var cookie = readCookie("navkeys");
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if (cookie && cookie == 'true') input.checked = true;
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input.onclick = selectOption;
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document.onkeydown = navkey;
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}
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}
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// Parse an HTML5-liberalized version of RFC 3339 datetime values
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Date.parseRFC3339 = function (string) {
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var date=new Date();
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date.setTime(0);
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var match = string.match(/(\d{4})-(\d\d)-(\d\d)\s*(?:[\sT]\s*(\d\d):(\d\d)(?::(\d\d))?(\.\d*)?\s*(Z|([-+])(\d\d):(\d\d))?)?/);
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if (!match) return;
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if (match[2]) match[2]--;
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if (match[7]) match[7] = (match[7]+'000').substring(1,4);
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var field = [null,'FullYear','Month','Date','Hours','Minutes','Seconds','Milliseconds'];
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for (var i=1; i<=7; i++) if (match[i]) date['setUTC'+field[i]](match[i]);
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if (match[9]) date.setTime(date.getTime()+
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(match[9]=='-'?1:-1)*(match[10]*3600000+match[11]*60000) );
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return date.getTime();
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}
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// convert datetime to local date
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var localere = /^(\w+) (\d+) (\w+) \d+ 0?(\d\d?:\d\d):\d\d ([AP]M) (EST|EDT|CST|CDT|MST|MDT|PST|PDT)/;
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function localizeDate(element) {
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var date = new Date();
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date.setTime(Date.parseRFC3339(element.getAttribute('datetime')));
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if (!date.getTime()) return;
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var local = date.toLocaleString();
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var match = local.match(localere);
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if (match) { /* Firefox */
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element.innerHTML = match[4] + ' ' + match[5].toLowerCase();
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element.title = match[6] + " \u2014 " +
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match[1] + ', ' + match[3] + ' ' + match[2];
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return days[date.getDay()] + ', ' + months[date.getMonth()] + ' ' +
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date.getDate() + ', ' + date.getFullYear();
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} else {
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local = local.replace(/GMT(-\d\d\d\d) \(.*\)$/, '$1'); /* Webkit */
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element.title = element.innerHTML + ' GMT';
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element.innerHTML = local;
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return days[date.getDay()] + ', ' + date.getDate() + ' ' +
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months[date.getMonth()] + ' ' + date.getFullYear();
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}
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}
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// find entries (and localizeDates)
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function findEntries() {
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var times = document.getElementsByTagName('time');
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for (var i=0; i<times.length; i++) {
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if (times[i].title == "GMT") {
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var date = localizeDate(times[i]);
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var parent = times[i];
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while (parent &&
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(!parent.className || parent.className.split(' ')[0] != 'news')) {
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parent = parent.parentNode;
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}
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if (parent) {
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var info = entries[entries.length] = new Object();
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info.parent = parent;
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info.date = date;
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info.datetime = times[i].getAttribute('datetime').substring(0,10);
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}
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}
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}
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}
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// insert/remove date headers to indicate change of date in local time zone
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function moveDateHeaders() {
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var lastdate = ''
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for (var i=0; i<entries.length; i++) {
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var parent = entries[i].parent;
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var date = entries[i].date;
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sibling = parent.previousSibling;
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while (sibling && sibling.nodeType != 1) {
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sibling = sibling.previousSibling;
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}
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if (sibling && sibling.nodeName.toLowerCase() == 'h2') {
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if (lastdate == date) {
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sibling.parentNode.removeChild(sibling);
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} else {
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sibling.childNodes[0].innerHTML = date;
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sibling.childNodes[0].setAttribute('datetime',entries[i].datetime);
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lastdate = date;
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}
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} else if (lastdate != date) {
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var h2 = document.createElement('h2');
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var time = document.createElement('time');
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time.setAttribute('datetime',entries[i].datetime);
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time.appendChild(document.createTextNode(date));
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h2.appendChild(time);
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parent.parentNode.insertBefore(h2, parent);
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lastdate = date;
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}
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}
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}
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function moveSidebar() {
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var sidebar = document.getElementById('sidebar');
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if (sidebar.currentStyle && sidebar.currentStyle['float'] == 'none') return;
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if (window.getComputedStyle && document.defaultView.getComputedStyle(sidebar,null).getPropertyValue('float') == 'none') return;
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var h1 = sidebar.previousSibling;
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while (h1.nodeType != 1) h1=h1.previousSibling;
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if (h1.nodeName.toLowerCase() == 'h1') h1.parentNode.removeChild(h1);
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var footer = document.getElementById('footer');
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var ul = footer.lastChild;
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while (ul.nodeType != 1) ul=ul.previousSibling;
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var twisty = document.createElement('a');
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twisty.appendChild(document.createTextNode('\u25bc'));
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twisty.title = 'hide';
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twisty.onclick = function() {
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var display = 'block';
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if (this.childNodes[0].nodeValue == '\u25ba') {
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this.title = 'hide';
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this.childNodes[0].nodeValue = '\u25bc';
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} else {
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this.title = 'show';
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this.childNodes[0].nodeValue = '\u25ba';
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display = 'none';
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}
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ul.style.display = display;
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createCookie("subscriptions", display, 365);
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}
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var cookie = readCookie("subscriptions");
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if (cookie && cookie == 'none') twisty.onclick();
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for (var node=footer.lastChild; node; node=footer.lastChild) {
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if (twisty && node.nodeType == 1 && node.nodeName.toLowerCase() == 'h2') {
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node.appendChild(twisty);
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twisty = null;
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}
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footer.removeChild(node);
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sidebar.insertBefore(node, sidebar.firstChild);
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}
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var body = document.getElementById('body');
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sidebar.parentNode.removeChild(sidebar);
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body.parentNode.insertBefore(sidebar, body);
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}
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// adjust dates to local time zones, optionally provide navigation keys
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function personalize() {
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moveSidebar();
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findEntries();
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addOption();
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moveDateHeaders();
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}
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// hook event
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window.onload = personalize;
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if (document.addEventListener) {
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onDOMLoad = function() {
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window.onload = undefined;
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personalize();
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};
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document.addEventListener("DOMContentLoaded", onDOMLoad, false);
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}
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