//--------------------------------------------------------------
// Name: Utils.js
// Date: 06/26/05
// Desc: Handy utilities
//
// Copyright (C) 2002-5 nekotech SOFTWARE
//--------------------------------------------------------------
//--------------------------------------------------------------
// Get an object by id
//--------------------------------------------------------------
function GetObjectByID(id)
{
return(document.getElementById(id));
}
//--------------------------------------------------------------
// Get an image
//--------------------------------------------------------------
function GetImageByName(name)
{
return(document.images[name]);
}
//--------------------------------------------------------------
// Get a form
//--------------------------------------------------------------
function GetFormByName(name)
{
return(document.forms[name]);
}
//--------------------------------------------------------------
// Find the first selected radio button in a form
//--------------------------------------------------------------
function FirstCheckedRadio(form, startIndex)
{
var i;
var element;
for (i = startIndex; i < form.length; ++i)
{
element = form.elements[i];
if ((element.type == "radio") &&
(element.checked == true))
return(i);
}
return(-1);
}
//--------------------------------------------------------------
// Load the arguments from the URL location
//--------------------------------------------------------------
function GetArgs()
{
var args = new Object();
var query = location.search.substring(1);
var pairs = query.split("+");
for (var i = 0; i < pairs.length; ++i)
{
var pos = pairs[i].indexOf('=');
if (pos == -1)
continue;
var argName = pairs[i].substring(0, pos);
var value = pairs[i].substring(pos + 1);
args[argName] = unescape(value);
}
return(args);
}
//--------------------------------------------------------------
// Get the parent URL from url
//--------------------------------------------------------------
function ParentURL(url)
{
var slashChar = "\/";
var slashIdx = url.lastIndexOf(slashChar);
if (slashIdx == url.length)
slashIdx = url.lastIndexOf(slashChar, url.length - 1);
return(url.substring(0, slashIdx));
}
//--------------------------------------------------------------
// Find the lecture that corresponds to this lecture code, if any
//--------------------------------------------------------------
function LectureFromCode(code)
{
var lecture = playlist[code];
return(lecture);
}
//--------------------------------------------------------------
// Find the lecture that corresponds to this segment code, if any
//--------------------------------------------------------------
function LectureFromSegment(code)
{
var name, list;
var hasCode = 0;
for (name in playlist)
{
lecture = playlist[name];
if (SegmentIndexForCode(lecture, code) != -1)
{
hasCode = 1;
break;
}
}
return(hasCode ? name : "");
}
//--------------------------------------------------------------
// Return the index of the matching segment, -1 if none
//--------------------------------------------------------------
function SegmentIndexForCode(lecture, code)
{
var encoded = Encode(code);
for (var i = 0; i < lecture.length; ++i)
{
if (encoded == lecture[i])
return(i);
}
return(-1);
}
//--------------------------------------------------------------
// Return the index of the next segment, -1 if none
//--------------------------------------------------------------
function NextSegmentIndex(lecture, index)
{
if (index < (lecture.length - 1))
return(index + 1);
return(-1);
}
//--------------------------------------------------------------
// Get the base URL of the web page w/o search information
//--------------------------------------------------------------
function BaseURL(url)
{
var queryIdx = url.indexOf("?");
return(url.substring(0, queryIdx));
}
//--------------------------------------------------------------
// Get location of the Playlist Root folder
//--------------------------------------------------------------
function PlaylistRootURL(url)
{
var scriptsDir = ParentURL(url);
var root = ParentURL(scriptsDir);
if (document.location.protocol == "file:")
root += "/PlaylistsLocal/";
else
root += "/Playlists/";
return(root);
}
//--------------------------------------------------------------
// Build a URL for this lecture and index
//--------------------------------------------------------------
function BuildURL(baseURL, lecture, lectureCode, index, playMode)
{
var url = baseURL + "?P=" + playMode + "+L=" + lectureCode + "+S=";
if (playMode == "P")
url += Decode(lecture[index]);
else
url += (parseInt(index) + 1);
return(url);
}
//--------------------------------------------------------------
// Show links to the previous segments
//--------------------------------------------------------------
function PreviousSegments(baseURL, lecture, lectureCode, index)
{
var str = "";
if (index == 0)
return("None.
");
for (var i = 0; i < lecture.length; ++i)
{
if ((index == -1) ||
(i < index))
{
var newURL = BuildURL(baseURL, lecture, lectureCode, i, "P");
str += "Segment " + (i + 1) + ": ";
str += Decode(lecture[i]) + "<\/a>" + "
\n";
}
}
return(str);
}
//--------------------------------------------------------------
// Build the link to the rm file
//--------------------------------------------------------------
function RealMediaFile(url, lecture, index)
{
var alpha = "abcdefghijklmnopqrstuvwxyz";
var rm = url + "/../../Participatory/" + lectureCode + "/" + lectureCode + alpha.substr(index, 1) + ".rm";
return(rm);
}
function RealMediaCodeFile(url, index)
{
var rm = url + "/../../Common/";
if (index == -1)
rm += "Chirp.rm";
else
rm += index + ".rm";
return(rm);
}
//--------------------------------------------------------------
// Build the player for this link
//--------------------------------------------------------------
function EmbeddedPlayer(playlistURL, lecture, index, playMode, showSlider)
{
var str;
var rm = RealMediaFile(playlistURL, lecture, index);
if (playMode == "P")
{
var play = "