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help.js
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2003-06-07
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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998-1999 Netscape Communications Corporation. All
* Rights Reserved.
* Contributor(s):
* Original author: oeschger@netscape.com
* amended by: Peter Wilson (added sidebar tabs) */
//-------- global variables
var helpBrowser;
var helpWindow;
var helpSearchPanel;
var emptySearch;
var emptySearchText
var emptySearchLink
var helpTocPanel;
var helpIndexPanel;
var helpGlossaryPanel;
// Namespaces
const NC = "http://home.netscape.com/NC-rdf#";
const SN = "rdf:http://www.w3.org/1999/02/22-rdf-syntax-ns#";
const XML = "http://www.w3.org/XML/1998/namespace#"
const MAX_LEVEL = 40; // maximum depth of recursion in search datasources.
// Resources
var RDF = Components.classes["@mozilla.org/rdf/rdf-service;1"].getService(Components.interfaces.nsIRDFService);
var RDF_ROOT = RDF.GetResource("urn:root");
var NC_PANELLIST = RDF.GetResource(NC + "panellist");
var NC_PANELID = RDF.GetResource(NC + "panelid");
var NC_EMPTY_SEARCH_TEXT = RDF.GetResource(NC + "emptysearchtext");
var NC_EMPTY_SEARCH_LINK = RDF.GetResource(NC + "emptysearchlink");
var NC_DATASOURCES = RDF.GetResource(NC + "datasources");
var NC_SUBHEADINGS = RDF.GetResource(NC + "subheadings");
var NC_NAME = RDF.GetResource(NC + "name");
var NC_CHILD = RDF.GetResource(NC + "child");
var NC_LINK = RDF.GetResource(NC + "link");
var NC_TITLE = RDF.GetResource(NC + "title");
var NC_BASE = RDF.GetResource(NC + "base");
var NC_DEFAULTTOPIC = RDF.GetResource(NC + "defaulttopic");
var RDFCUtils = Components.classes["@mozilla.org/rdf/container-utils;1"].getService().
QueryInterface(Components.interfaces.nsIRDFContainerUtils);
var RDFContainer = Components.classes["@mozilla.org/rdf/container;1"].getService(Components.interfaces.nsIRDFContainer);
var CONSOLE_SERVICE = Components.classes['@mozilla.org/consoleservice;1'].getService(Components.interfaces.nsIConsoleService);
var urnID = 0;
var RE;
var helpFileURI;
var helpFileDS;
// Set from nc:base attribute on help rdf file. It may be used for prefix reduction on all links within
// the current help set.
var helpBaseURI;
const defaultHelpFile = "chrome://help/locale/mozillahelp.rdf";
// Set from nc:defaulttopic. It is used when the requested uri has no topic specified.
var defaultTopic = "welcome";
var searchDatasources = "rdf:null";
var searchDS = null;
const NSRESULT_RDF_SYNTAX_ERROR = 0x804e03f7;
// This function is called by dialogs/windows that want to display context-sensitive help
// These dialogs/windows should include the script chrome://help/content/contextHelp.js
function displayTopic(topic) {
if (!topic)
topic = defaultTopic;
var uri = getLink(topic);
if (!uri) // Topic not found - revert to default.
uri = getLink(defaultTopic);
loadURI(uri);
}
// Initialize the Help window
function init() {
//cache panel references.
helpWindow = document.getElementById("help");
helpSearchPanel = document.getElementById("help-search-panel");
helpTocPanel = document.getElementById("help-toc-tree");
helpIndexPanel = document.getElementById("help-index-tree");
helpGlossaryPanel = document.getElementById("help-glossary-tree");
helpBrowser = document.getElementById("help-content");
var URI = normalizeURI(decodeURIComponent(window.location.search));
helpFileURI = URI.helpFileURI;
var helpTopic = URI.topic;
helpBaseURI = helpFileURI.substring(0, helpFileURI.lastIndexOf("/")+1); // trailing "/" included.
loadHelpRDF();
displayTopic(helpTopic);
// move to right end of screen
var width = document.documentElement.getAttribute("width");
var height = document.documentElement.getAttribute("height");
window.moveTo(screen.availWidth-width, (screen.availHeight-height)/2);
var sessionHistory = Components.classes["@mozilla.org/browser/shistory;1"]
.createInstance(Components.interfaces.nsISHistory);
getWebNavigation().sessionHistory = sessionHistory;
window.XULBrowserWindow = new nsHelpStatusHandler();
// hook up UI through progress listener
var interfaceRequestor = helpBrowser.docShell.QueryInterface(Components.interfaces.nsIInterfaceRequestor);
var webProgress = interfaceRequestor.getInterface(Components.interfaces.nsIWebProgress);
webProgress.addProgressListener(window.XULBrowserWindow, Components.interfaces.nsIWebProgress.NOTIFY_ALL);
}
function normalizeURI(uri) {
// uri in format [uri of help rdf file][?initial topic]
// if the whole uri or help file uri is omitted then the default help is assumed.
// unpack uri
var URI = {};
URI.helpFileURI = defaultHelpFile;
URI.topic = null;
// Case: No help uri at all.
if (uri) {
// remove leading ?
if (uri.substr(0,1) == "?")
uri = uri.substr(1);
var i = uri.indexOf("?");
// Case: Full uri with topic.
if ( i != -1) {
URI.helpFileURI = uri.substr(0,i);
URI.topic = uri.substr(i+1);
}
else {
// Case: uri with no topic.
if (uri.substr(0,7) == "chrome:")
URI.helpFileURI = uri;
else {
// Case: uri with topic only.
URI.topic = uri;
}
}
}
URI.uri = URI.helpFileURI + ((URI.topic)? "?" + URI.topic : "");
return URI;
}
function loadHelpRDF() {
if (!helpFileDS) {
try {
helpFileDS = RDF.GetDataSourceBlocking(helpFileURI);
}
catch (e if (e.result == NSRESULT_RDF_SYNTAX_ERROR)) {
log("Help file: " + helpFileURI + " contains a syntax error.");
}
catch (e) {
log("Help file: " + helpFileURI + " was not found.");
}
try {
helpWindow.setAttribute("title", getAttribute(helpFileDS, RDF_ROOT, NC_TITLE, ""));
helpBaseURI = getAttribute(helpFileDS, RDF_ROOT, NC_BASE, helpBaseURI);
defaultTopic = getAttribute(helpFileDS, RDF_ROOT, NC_DEFAULTTOPIC, "welcome");
var panelDefs = helpFileDS.GetTarget(RDF_ROOT, NC_PANELLIST, true);
RDFContainer.Init(helpFileDS, panelDefs);
var iterator = RDFContainer.GetElements();
while (iterator.hasMoreElements()) {
var panelDef = iterator.getNext();
var panelID = getAttribute(helpFileDS, panelDef, NC_PANELID, null);
var datasources = getAttribute(helpFileDS, panelDef, NC_DATASOURCES, "rdf:none");
datasources = normalizeLinks(helpBaseURI, datasources);
// cache additional datsources to augment search datasources.
if (panelID == "search") {
emptySearchText = getAttribute(helpFileDS, panelDef, NC_EMPTY_SEARCH_TEXT, null) || "No search items found." ;
emptySearchLink = getAttribute(helpFileDS, panelDef, NC_EMPTY_SEARCH_LINK, null) || "about:blank";
searchDatasources = datasources;
datasources = "rdf:null"; // but don't try to display them yet!
}
// cache toc datasources for use by ID lookup.
var tree = document.getElementById("help-" + panelID + "-tree");
tree.setAttribute("datasources", datasources);
//if (panelID == "toc") {
if (tree.database) {
loadDatabases(tree.database, datasources);
tree.builder.rebuild();
}
//}
}
}
catch (e) {
log(e + "");
}
}
}
function loadDatabases(compositeDatabase, datasources) {
var ds = datasources.split(/\s+/);
for (var i=0; i < ds.length; ++i) {
if (ds[i] == "rdf:null" || ds[i] == "")
continue;
try {
// we need blocking here to ensure the database is loaded so getLink(topic) works.
var datasource = RDF.GetDataSourceBlocking(ds[i]);
if (datasource)
compositeDatabase.AddDataSource(datasource);
}
catch (e) {
log("Datasource: " + ds[i] + " was not found.");
}
}
}
// prepend helpBaseURI to list of space separated links if the don't start with "chrome:"
function normalizeLinks(helpBaseURI, links) {
if (!helpBaseURI)
return links;
var ls = links.split(/\s+/);
if (ls.length == 0)
return links;
for (var i=0; i < ls.length; ++i) {
if (ls[i] == "")
continue;
if (ls[i].substr(0,7) != "chrome:" && ls[i].substr(0,4) != "rdf:")
ls[i] = helpBaseURI + ls[i];
}
return ls.join(" ");
}
function getLink(ID) {
if (!ID)
return null;
// Note resources are stored in fileURL#ID format.
// We have one possible source for an ID for each datasource in the composite datasource.
// The first ID which matches is returned.
var tocTree = document.getElementById("help-toc-tree");
tocDS = tocTree.database;
if (tocDS == null)
return null;
var tocDatasources = tocTree.getAttribute("datasources");
var ds = tocDatasources.split(/\s+/);
for (var i=0; i < ds.length; ++i) {
if (ds[i] == "rdf:null" || ds[i] == "")
continue;
try {
var rdfID = ds[i] + "#" + ID;
var resource = RDF.GetResource(rdfID);
if (resource) {
var link = tocDS.GetTarget(resource, NC_LINK, true);
if (link) {
link = link.QueryInterface(Components.interfaces.nsIRDFLiteral);
if (link)
return link.Value;
else
return null;
}
}
}
catch (e) { log(rdfID + " " + e);}
}
return null;
}
// Called by contextHelp.js to determine if this window is displaying the requested help file.
function getHelpFileURI() {
return helpFileURI;
}
function getWebNavigation()
{
return helpBrowser.webNavigation;
}
function loadURI(uri)
{
if (uri.substr(0,7) != "chrome:")
uri = helpBaseURI + uri;
const nsIWebNavigation = Components.interfaces.nsIWebNavigation;
getWebNavigation().loadURI(uri, nsIWebNavigation.LOAD_FLAGS_NONE, null, null, null);
}
function goBack()
{
var webNavigation = getWebNavigation();
if (webNavigation.canGoBack)
webNavigation.goBack();
}
function goForward()
{
var webNavigation = getWebNavigation();
if (webNavigation.canGoForward)
webNavigation.goForward();
}
function goHome() {
// load "Welcome" page
displayTopic(defaultTopic);
}
function print()
{
try {
_content.print();
} catch (e) {
}
}
function createBackMenu(event)
{
return FillHistoryMenu(event.target, "back");
}
function createForwardMenu(event)
{
return FillHistoryMenu(event.target, "forward");
}
function gotoHistoryIndex(aEvent)
{
var index = aEvent.target.getAttribute("index");
if (!index)
return false;
try {
getWebNavigation().gotoIndex(index);
}
catch(ex) {
return false;
}
return true;
}
function BrowserBack()
{
try {
getWebNavigation().goBack();
}
catch(ex) {
}
UpdateBackForwardButtons();
}
function BrowserForward()
{
try {
getWebNavigation().goForward();
}
catch(ex) {
}
UpdateBackForwardButtons();
}
function nsHelpStatusHandler()
{
}
nsHelpStatusHandler.prototype =
{
onStateChange : function(aWebProgress, aRequest, aStateFlags, aStatus) {},
onProgressChange : function(aWebProgress, aRequest, aCurSelfProgress,
aMaxSelfProgress, aCurTotalProgress, aMaxTotalProgress) {},
onSecurityChange : function(aWebProgress, aRequest, state) {},
onLocationChange : function(aWebProgress, aRequest, aLocation)
{
UpdateBackForwardButtons();
},
QueryInterface : function(aIID)
{
if (aIID.equals(Components.interfaces.nsIWebProgressListener) ||
aIID.equals(Components.interfaces.nsISupportsWeakReference) ||
aIID.equals(Components.interfaces.nsIXULBrowserWindow) ||
aIID.equals(Components.interfaces.nsISupports))
return this;
throw Components.results.NS_NOINTERFACE;
},
setJSStatus : function(status) {},
setJSDefaultStatus : function(status) {},
setOverLink : function(link) {}
}
function UpdateBackForwardButtons()
{
var backBroadcaster = document.getElementById("canGoBack");
var forwardBroadcaster = document.getElementById("canGoForward");
var webNavigation = getWebNavigation();
// Avoid setting attributes on broadcasters if the value hasn't changed!
// Remember, guys, setting attributes on elements is expensive! They
// get inherited into anonymous content, broadcast to other widgets, etc.!
// Don't do it if the value hasn't changed! - dwh
var backDisabled = (backBroadcaster.getAttribute("disabled") == "true");
var forwardDisabled = (forwardBroadcaster.getAttribute("disabled") == "true");
if (backDisabled == webNavigation.canGoBack)
backBroadcaster.setAttribute("disabled", !backDisabled);
if (forwardDisabled == webNavigation.canGoForward)
forwardBroadcaster.setAttribute("disabled", !forwardDisabled);
}
function find(again, reverse)
{
var focusedWindow = document.commandDispatcher.focusedWindow;
if (!focusedWindow || focusedWindow == window)
focusedWindow = window._content;
if (again)
findAgainInPage(helpBrowser, window._content, focusedWindow, reverse);
else
findInPage(helpBrowser, window._content, focusedWindow)
}
function getMarkupDocumentViewer()
{
return helpBrowser.markupDocumentViewer;
}
function BrowserReload()
{
const reloadFlags = Components.interfaces.nsIWebNavigation.LOAD_FLAGS_NONE;
return BrowserReloadWithFlags(reloadFlags);
}
function BrowserReloadWithFlags(reloadFlags)
{
try {
/* Need to get SessionHistory from docshell so that
* reload on framed pages will work right. This
* method should not be used for the context menu item "Reload frame".
* "Reload frame" should directly call into docshell as it does right now
*/
var sh = getWebNavigation().sessionHistory;
var webNav = sh.QueryInterface(Components.interfaces.nsIWebNavigation);
webNav.reload(reloadFlags);
}
catch(ex) {
}
}
// doc=null for regular page info, doc=owner document for frame info
function BrowserPageInfo(doc)
{
window.openDialog("chrome://navigator/content/pageInfo.xul",
"_blank",
"chrome,dialog=no",
doc);
}
function BrowserViewSource()
{
var focusedWindow = document.commandDispatcher.focusedWindow;
if (focusedWindow == window)
focusedWindow = _content;
if (focusedWindow)
var docCharset = "charset=" + focusedWindow.document.characterSet;
BrowserViewSourceOfURL(_content.location, docCharset);
}
function BrowserViewSourceOfURL(url, charset)
{
// try to open a view-source window while inheriting the charset (if any)
openDialog("chrome://navigator/content/viewSource.xul",
"_blank",
"scrollbars,resizable,chrome,dialog=no",
url, charset);
}
//Show the selected sidebar panel
function showPanel(panelId) {
helpSearchPanel.setAttribute("hidden", "true");
helpTocPanel.setAttribute("hidden", "true");
helpIndexPanel.setAttribute("hidden", "true");
helpGlossaryPanel.setAttribute("hidden", "true");
var thePanel = document.getElementById(panelId);
thePanel.setAttribute("hidden","false");
}
function onselect_loadURI(tree, columnName) {
try {
var row = tree.treeBoxObject.view.selection.currentIndex;
var properties = Components.classes["@mozilla.org/supports-array;1"].createInstance(Components.interfaces.nsISupportsArray);
tree.treeBoxObject.view.getCellProperties(row, columnName, properties);
if (!properties) return;
var uri = getPropertyValue(properties, "link-");
if (uri)
loadURI(uri);
}
catch (e) {}// when switching between tabs a spurious row number is returned.
}
/** Search properties nsISupportsArray for an nsIAtom which starts with the given property name. **/
function getPropertyValue(properties, propName) {
for (var i=0; i< properties.Count(); ++i) {
var atom = properties.GetElementAt(i).QueryInterface(Components.interfaces.nsIAtom);
var atomValue = atom.GetUnicode();
if (atomValue.substr(0, propName.length) == propName)
return atomValue.substr(propName.length);
}
return null;
}
function doFind() {
var searchTree = document.getElementById("help-search-tree");
var findText = document.getElementById("findText");
// clear any previous results.
clearDatabases(searchTree.database);
// split search string into separate terms and compile into regexp's
RE = findText.value.split(/\s+/);
for (var i=0; i < RE.length; ++i) {
if (RE[i] == "")
continue;
if (RE[i].length > 3) {
RE[i] = new RegExp(RE[i].substring(0, RE[i].length-1) +"\w?", "i");
} else {
RE[i] = new RegExp(RE[i], "i");
}
}
emptySearch = true;
// search TOC
var resultsDS = Components.classes["@mozilla.org/rdf/datasource;1?name=in-memory-datasource"].createInstance(Components.interfaces.nsIRDFDataSource);
var tree = document.getElementById("help-toc-tree");
var sourceDS = tree.database;
doFindOnDatasource(resultsDS, sourceDS, RDF_ROOT, 0);
// search additional search datasources
if (searchDatasources != "rdf:null") {
if (!searchDS)
searchDS = loadCompositeDS(searchDatasources);
doFindOnDatasource(resultsDS, searchDS, RDF_ROOT, 0);
}
// search glossary.
tree = document.getElementById("help-glossary-tree");
sourceDS = tree.database;
if (!sourceDS) // If the glossary has never been displayed this will be null (sigh!).
sourceDS = loadCompositeDS(tree.datasources);
doFindOnDatasource(resultsDS, sourceDS, RDF_ROOT, 0);
if (emptySearch)
assertSearchEmpty(resultsDS);
// Add the datasource to the search tree
searchTree.database.AddDataSource(resultsDS);
searchTree.builder.rebuild();
}
function doEnabling() {
var findButton = document.getElementById("findButton");
var findTextbox = document.getElementById("findText");
findButton.disabled = !findTextbox.value;
}
function clearDatabases(compositeDataSource) {
var enumDS = compositeDataSource.GetDataSources()
while (enumDS.hasMoreElements()) {
var ds = enumDS.getNext();
compositeDataSource.RemoveDataSource(ds);
}
}
function doFindOnDatasource(resultsDS, sourceDS, resource, level) {
if (level > MAX_LEVEL) {
try {
log("Recursive reference to resource: " + resource.Value + ".");
}
catch (e) {
log("Recursive reference to unknown resource.");
}
return;
}
// find all SUBHEADING children of current resource.
var targets = sourceDS.GetTargets(resource, NC_SUBHEADINGS, true);
while (targets.hasMoreElements()) {
var target = targets.getNext();
target = target.QueryInterface(Components.interfaces.nsIRDFResource);
// The first child of a rdf:subheading should (must) be a rdf:seq.
// Should we test for a SEQ here?
doFindOnSeq(resultsDS, sourceDS, target, level+1);
}
}
function doFindOnSeq(resultsDS, sourceDS, resource, level) {
// load up an RDFContainer so we can access the contents of the current rdf:seq.
RDFContainer.Init(sourceDS, resource);
var targets = RDFContainer.GetElements();
while (targets.hasMoreElements()) {
var target = targets.getNext();
target = target.QueryInterface(Components.interfaces.nsIRDFResource);
var name = sourceDS.GetTarget(target, NC_NAME, true);
name = name.QueryInterface(Components.interfaces.nsIRDFLiteral);
if (isMatch(name.Value)) {
// we have found a search entry - add it to the results datasource.
// Get URL of html for this entry.
var link = sourceDS.GetTarget(target, NC_LINK, true);
link = link.QueryInterface(Components.interfaces.nsIRDFLiteral);
urnID++;
resultsDS.Assert(RDF_ROOT,
RDF.GetResource("http://home.netscape.com/NC-rdf#child"),
RDF.GetResource("urn:" + urnID),
true);
resultsDS.Assert(RDF.GetResource("urn:" + urnID),
RDF.GetResource("http://home.netscape.com/NC-rdf#name"),
name,
true);
resultsDS.Assert(RDF.GetResource("urn:" + urnID),
RDF.GetResource("http://home.netscape.com/NC-rdf#link"),
link,
true);
emptySearch = false;
}
// process any nested rdf:seq elements.
doFindOnDatasource(resultsDS, sourceDS, target, level+1);
}
}
function assertSearchEmpty(resultsDS) {
var resSearchEmpty = RDF.GetResource("urn:emptySearch");
resultsDS.Assert(RDF_ROOT,
NC_CHILD,
resSearchEmpty,
true);
resultsDS.Assert(resSearchEmpty,
NC_NAME,
RDF.GetLiteral(emptySearchText),
true);
resultsDS.Assert(resSearchEmpty,
NC_LINK,
RDF.GetLiteral(emptySearchLink),
true);
}
function isMatch(text) {
for (var i=0; i < RE.length; ++i ) {
if (!RE[i].test(text))
return false;
}
return true;
}
function loadCompositeDS(datasources) {
// We can't search on each individual datasource's - only the aggregate (for each sidebar tab)
// has the appropriate structure.
var compositeDS = Components.classes["@mozilla.org/rdf/datasource;1?name=composite-datasource"]
.createInstance(Components.interfaces.nsIRDFCompositeDataSource);
var ds = datasources.split(/\s+/);
for (var i=0; i < ds.length; ++i) {
if (ds[i] == "rdf:null" || ds[i] == "")
continue;
try {
// we need blocking here to ensure the database is loaded.
var sourceDS = RDF.GetDataSourceBlocking(ds[i]);
compositeDS.AddDataSource(sourceDS);
}
catch (e) {
log("Datasource: " + ds[i] + " was not found.");
}
}
return compositeDS;
}
function getAttribute(datasource, resource, attributeResourceName, defaultValue) {
var literal = datasource.GetTarget(resource, attributeResourceName, true);
if (!literal)
return defaultValue;
return getLiteralValue(literal, defaultValue);
}
function getLiteralValue(literal, defaultValue) {
if (literal) {
literal = literal.QueryInterface(Components.interfaces.nsIRDFLiteral);
if (literal)
return literal.Value;
}
if (defaultValue)
return defaultValue;
return null;
}
// Write debug string to javascript console.
function log(aText) {
CONSOLE_SERVICE.logStringMessage(aText);
}
//INDEX OPENING FUNCTION -- called in oncommand for index pane
// iterate over all the items in the outliner;
// open the ones at the top-level (i.e., expose the headings underneath
// the letters in the list.
function displayIndex() {
var treeview = helpIndexPanel.view;
var i = treeview.rowCount;
while (i--)
if (!treeview.getLevel(i) && !treeview.isContainerOpen(i))
treeview.toggleOpenState(i);
}