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gitweb.js: Add UI for selecting common timezone to display dates

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This will modify HTML, add CSS rules and add DOM event handlers so
that clicking on any date (the common part, not the localtime part)
will display a drop down menu to choose the timezone to change to.

Currently menu displays only the following timezones:

  utc
  local
  -1200
  -1100
  ...
  +1100
  +1200
  +1300
  +1400

In timezone selection menu each timezone is +1hr to the previous.  The
code is capable of handling fractional timezones, but those have not
been added to the menu.

All changes are saved to a cookie, so page changes and closing /
reopening browser retains the last known timezone setting used.

[jn: Changed from innerHTML to DOM, moved to event delegation for
onclick to trigger menu, added close button and cookie refreshing]

Helped-by: Kevin Cernekee <cernekee@gmail.com>
Signed-off-by: John 'Warthog9' Hawley <warthog9@eaglescrag.net>
Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
John 'Warthog9' Hawley 2011-04-28 21:04:10 +02:00 committed by Junio C Hamano
parent 291e52bd19
commit 2ae8da2552
4 changed files with 345 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
gitweb/gitweb.perl
View File

@ -3738,7 +3738,8 @@ sub git_footer_html {
(gitweb_check_feature('javascript-actions') ?
qq! fixLinks();\n! : '').
# last parameter to onloadTZSetup must be CSS class used by format_timestamp_html
qq! onloadTZSetup('local', 'gitweb_tz', 'datetime');\n!.
qq! var tz_cookie = { name: 'gitweb_tz', expires: 14, path: '/' };\n!. # in days
qq! onloadTZSetup('local', tz_cookie, 'datetime');\n!.
qq!};\n!.
qq!</script>\n!;
}

33
gitweb/static/gitweb.css
View File

@ -579,6 +579,39 @@ div.remote {
display: inline-block;
}
/* JavaScript-based timezone manipulation */
.popup { /* timezone selection UI */
position: absolute;
/* "top: 0; right: 0;" would be better, if not for bugs in browsers */
top: 0; left: 0;
border: 1px solid;
padding: 2px;
background-color: #f0f0f0;
font-style: normal;
color: #000000;
cursor: auto;
}
.close-button { /* close timezone selection UI without selecting */
/* float doesn't work within absolutely positioned container,
* if width of container is not set explicitly */
/* float: right; */
position: absolute;
top: 0px; right: 0px;
border: 1px solid green;
margin: 1px 1px 1px 1px;
padding-bottom: 2px;
width: 12px;
height: 10px;
font-size: 9px;
font-weight: bold;
text-align: center;
background-color: #fff0f0;
cursor: pointer;
}
/* Style definition generated by highlight 2.4.5, http://www.andre-simon.de/ */
/* Highlighting theme definition: */

298
gitweb/static/js/adjust-timezone.js
View File

@ -7,34 +7,51 @@
*/
/**
* Get common timezone and adjust dates to use this common timezone.
* Get common timezone, add UI for changing timezones, and adjust
* dates to use requested common timezone.
*
* This function is called during onload event (added to window.onload).
*
* @param {String} tzDefault: default timezone, if there is no cookie
* @param {String} tzCookieName: name of cookie to store timezone
* @param {Object} tzCookieInfo: object literal with info about cookie to store timezone
* @param {String} tzCookieInfo.name: name of cookie to store timezone
* @param {String} tzClassName: denotes elements with date to be adjusted
*/
function onloadTZSetup(tzDefault, tzCookieName, tzClassName) {
var tzCookie = getCookie(tzCookieName);
var tz = tzCookie ? tzCookie : tzDefault;
function onloadTZSetup(tzDefault, tzCookieInfo, tzClassName) {
var tzCookieTZ = getCookie(tzCookieInfo.name, tzCookieInfo);
var tz = tzDefault;
if (tzCookieTZ) {
// set timezone to value saved in a cookie
tz = tzCookieTZ;
// refresh cookie, so its expiration counts from last use of gitweb
setCookie(tzCookieInfo.name, tzCookieTZ, tzCookieInfo);
}
// add UI for changing timezone
addChangeTZ(tz, tzCookieInfo, tzClassName);
// server-side of gitweb produces datetime in UTC,
// so if tz is 'utc' there is no need for changes
if (tz !== 'utc') {
fixDatetimeTZ(tz, tzClassName);
}
var nochange = tz === 'utc';
// adjust dates to use specified common timezone
fixDatetimeTZ(tz, tzClassName, nochange);
}
/* ...................................................................... */
/* Changing dates to use requested timezone */
/**
* Replace RFC-2822 dates contained in SPAN elements with tzClassName
* CSS class with equivalent dates in given timezone.
*
* @param {String} tz: numeric timezone in '(-|+)HHMM' format, or 'utc', or 'local'
* @param {String} tzClassName: specifies elements to be changed
* @param {Boolean} nochange: markup for timezone change, but don't change it
*/
function fixDatetimeTZ(tz, tzClassName) {
function fixDatetimeTZ(tz, tzClassName, nochange) {
// sanity check, method should be ensured by common-lib.js
if (!document.getElementsByClassName) {
return;
@ -48,13 +65,266 @@ function fixDatetimeTZ(tz, tzClassName) {
for (var i = 0, len = classesFound.length; i < len; i++) {
var curElement = classesFound[i];
// we use *.firstChild.data (W3C DOM) instead of *.innerHTML
// as the latter doesn't always work everywhere in every browser
var epoch = parseRFC2822Date(curElement.firstChild.data);
var adjusted = formatDateRFC2882(epoch, tz);
curElement.title = 'Click to change timezone';
if (!nochange) {
// we use *.firstChild.data (W3C DOM) instead of *.innerHTML
// as the latter doesn't always work everywhere in every browser
var epoch = parseRFC2822Date(curElement.firstChild.data);
var adjusted = formatDateRFC2882(epoch, tz);
curElement.firstChild.data = adjusted;
curElement.firstChild.data = adjusted;
}
}
}
/* ...................................................................... */
/* Adding triggers, generating timezone menu, displaying and hiding */
/**
* Adds triggers for UI to change common timezone used for dates in
* gitweb output: it marks up and/or creates item to click to invoke
* timezone change UI, creates timezone UI fragment to be attached,
* and installs appropriate onclick trigger (via event delegation).
*
* @param {String} tzSelected: pre-selected timezone,
* 'utc' or 'local' or '(-|+)HHMM'
* @param {Object} tzCookieInfo: object literal with info about cookie to store timezone
* @param {String} tzClassName: specifies elements to install trigger
*/
function addChangeTZ(tzSelected, tzCookieInfo, tzClassName) {
// make link to timezone UI discoverable
addCssRule('.'+tzClassName + ':hover',
'text-decoration: underline; cursor: help;');
// create form for selecting timezone (to be saved in a cookie)
var tzSelectFragment = document.createDocumentFragment();
tzSelectFragment = createChangeTZForm(tzSelectFragment,
tzSelected, tzCookieInfo, tzClassName);
// event delegation handler for timezone selection UI (clicking on entry)
// see http://www.nczonline.net/blog/2009/06/30/event-delegation-in-javascript/
// assumes that there is no existing document.onclick handler
document.onclick = function onclickHandler(event) {
//IE doesn't pass in the event object
event = event || window.event;
//IE uses srcElement as the target
var target = event.target || event.srcElement;
switch (target.className) {
case tzClassName:
// don't display timezone menu if it is already displayed
if (tzSelectFragment.childNodes.length > 0) {
displayChangeTZForm(target, tzSelectFragment);
}
break;
} // end switch
};
}
/**
* Create DocumentFragment with UI for changing common timezone in
* which dates are shown in.
*
* @param {DocumentFragment} documentFragment: where attach UI
* @param {String} tzSelected: default (pre-selected) timezone
* @param {Object} tzCookieInfo: object literal with info about cookie to store timezone
* @returns {DocumentFragment}
*/
function createChangeTZForm(documentFragment, tzSelected, tzCookieInfo, tzClassName) {
var div = document.createElement("div");
div.className = 'popup';
/* '<div class="close-button" title="(click on this box to close)">X</div>' */
var closeButton = document.createElement('div');
closeButton.className = 'close-button';
closeButton.title = '(click on this box to close)';
closeButton.appendChild(document.createTextNode('X'));
closeButton.onclick = closeTZFormHandler(documentFragment, tzClassName);
div.appendChild(closeButton);
/* 'Select timezone: <br clear="all">' */
div.appendChild(document.createTextNode('Select timezone: '));
var br = document.createElement('br');
br.clear = 'all';
div.appendChild(br);
/* '<select name="tzoffset">
* ...
* <option value="-0700">UTC-07:00</option>
* <option value="-0600">UTC-06:00</option>
* ...
* </select>' */
var select = document.createElement("select");
select.name = "tzoffset";
//select.style.clear = 'all';
select.appendChild(generateTZOptions(tzSelected));
select.onchange = selectTZHandler(documentFragment, tzCookieInfo, tzClassName);
div.appendChild(select);
documentFragment.appendChild(div);
return documentFragment;
}
/**
* Hide (remove from DOM) timezone change UI, ensuring that it is not
* garbage collected and that it can be re-enabled later.
*
* @param {DocumentFragment} documentFragment: contains detached UI
* @param {HTMLSelectElement} target: select element inside of UI
* @param {String} tzClassName: specifies element where UI was installed
* @returns {DocumentFragment} documentFragment
*/
function removeChangeTZForm(documentFragment, target, tzClassName) {
// find containing element, where we appended timezone selection UI
// `target' is somewhere inside timezone menu
var container = target.parentNode, popup = target;
while (container &&
container.className !== tzClassName) {
popup = container;
container = container.parentNode;
}
// safety check if we found correct container,
// and if it isn't deleted already
if (!container || !popup ||
container.className !== tzClassName ||
popup.className !== 'popup') {
return documentFragment;
}
// timezone selection UI was appended as last child
// see also displayChangeTZForm function
var removed = popup.parentNode.removeChild(popup);
if (documentFragment.firstChild !== removed) { // the only child
// re-append it so it would be available for next time
documentFragment.appendChild(removed);
}
// all of inline style was added by this script
// it is not really needed to remove it, but it is a good practice
container.removeAttribute('style');
return documentFragment;
}
/**
* Display UI for changing common timezone for dates in gitweb output.
* To be used from 'onclick' event handler.
*
* @param {HTMLElement} target: where to install/display UI
* @param {DocumentFragment} tzSelectFragment: timezone selection UI
*/
function displayChangeTZForm(target, tzSelectFragment) {
// for absolute positioning to be related to target element
target.style.position = 'relative';
target.style.display = 'inline-block';
// show/display UI for changing timezone
target.appendChild(tzSelectFragment);
}
/* ...................................................................... */
/* List of timezones for timezone selection menu */
/**
* Generate list of timezones for creating timezone select UI
*
* @returns {Object[]} list of e.g. { value: '+0100', descr: 'GMT+01:00' }
*/
function generateTZList() {
var timezones = [
{ value: "utc", descr: "UTC/GMT"},
{ value: "local", descr: "Local (per browser)"}
];
// generate all full hour timezones (no fractional timezones)
for (var x = -12, idx = timezones.length; x <= +14; x++, idx++) {
var hours = (x >= 0 ? '+' : '-') + padLeft(x >=0 ? x : -x, 2);
timezones[idx] = { value: hours + '00', descr: 'UTC' + hours + ':00'};
if (x === 0) {
timezones[idx].descr = 'UTC\u00B100:00'; // 'UTC&plusmn;00:00'
}
}
return timezones;
}
/**
* Generate <options> elements for timezone select UI
*
* @param {String} tzSelected: default timezone
* @returns {DocumentFragment} list of options elements to appendChild
*/
function generateTZOptions(tzSelected) {
var elems = document.createDocumentFragment();
var timezones = generateTZList();
for (var i = 0, len = timezones.length; i < len; i++) {
var tzone = timezones[i];
var option = document.createElement("option");
if (tzone.value === tzSelected) {
option.defaultSelected = true;
}
option.value = tzone.value;
option.appendChild(document.createTextNode(tzone.descr));
elems.appendChild(option);
}
return elems;
}
/* ...................................................................... */
/* Event handlers and/or their generators */
/**
* Create event handler that select timezone and closes timezone select UI.
* To be used as $('select[name="tzselect"]').onchange handler.
*
* @param {DocumentFragment} tzSelectFragment: timezone selection UI
* @param {Object} tzCookieInfo: object literal with info about cookie to store timezone
* @param {String} tzCookieInfo.name: name of cookie to save result of selection
* @param {String} tzClassName: specifies element where UI was installed
* @returns {Function} event handler
*/
function selectTZHandler(tzSelectFragment, tzCookieInfo, tzClassName) {
//return function selectTZ(event) {
return function (event) {
event = event || window.event;
var target = event.target || event.srcElement;
var selected = target.options.item(target.selectedIndex);
removeChangeTZForm(tzSelectFragment, target, tzClassName);
if (selected) {
selected.defaultSelected = true;
setCookie(tzCookieInfo.name, selected.value, tzCookieInfo);
fixDatetimeTZ(selected.value, tzClassName);
}
};
}
/**
* Create event handler that closes timezone select UI.
* To be used e.g. as $('.closebutton').onclick handler.
*
* @param {DocumentFragment} tzSelectFragment: timezone selection UI
* @param {String} tzClassName: specifies element where UI was installed
* @returns {Function} event handler
*/
function closeTZFormHandler(tzSelectFragment, tzClassName) {
//return function closeTZForm(event) {
return function (event) {
event = event || window.event;
var target = event.target || event.srcElement;
removeChangeTZForm(tzSelectFragment, target, tzClassName);
};
}
/* end of adjust-timezone.js */

27
gitweb/static/js/lib/common-lib.js
View File

@ -64,7 +64,7 @@ function padLeft(input, width, ch) {
/* ............................................................ */
/* Ajax */
/* Handling browser incompatibilities */
/**
* Create XMLHttpRequest object in cross-browser way
@ -88,6 +88,31 @@ function createRequestObject() {
}
/**
* Insert rule giving specified STYLE to given SELECTOR at the end of
* first CSS stylesheet.
*
* @param {String} selector: CSS selector, e.g. '.class'
* @param {String} style: rule contents, e.g. 'background-color: red;'
*/
function addCssRule(selector, style) {
var stylesheet = document.styleSheets[0];
var theRules = [];
if (stylesheet.cssRules) { // W3C way
theRules = stylesheet.cssRules;
} else if (stylesheet.rules) { // IE way
theRules = stylesheet.rules;
}
if (stylesheet.insertRule) { // W3C way
stylesheet.insertRule(selector + ' { ' + style + ' }', theRules.length);
} else if (stylesheet.addRule) { // IE way
stylesheet.addRule(selector, style);
}
}
/* ............................................................ */
/* Support for legacy browsers */