// swad.js: javascript functions
/*
SWAD (Shared Workspace At a Distance),
is a web platform developed at the University of Granada (Spain),
and used to support university teaching.
Copyright (C) 1999-2015 Antonio Caņas-Vargas
University of Granada (SPAIN) (acanas@ugr.es)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see .
*/
// Global variable used in refreshConnected()
var ActionAJAX;
// Global variables used in writeClock()
var IsToday;
var StrToday;
var Hour;
var Minute;
// Global variables used in writeClockConnected()
var NumUsrsCon;
var ListSeconds = new Array();
var countClockConnected = 0;
// Write a clock updated every minute
// IsToday, StrToday, Hour and Minute are global variables initialized before call this function
function writeClock() {
var StrHour = Hour;
var StrMinute = Minute;
var MidnightExceeded = false;
var PrintableClock;
if (Minute < 10)
StrMinute = "0" + StrMinute;
if (++Minute == 60) {
Minute = 0;
if (++Hour == 24) {
Hour = 0;
MidnightExceeded = true;
}
}
if (IsToday)
PrintableClock = StrToday + ", " + StrHour + ":" + StrMinute;
else
PrintableClock = StrHour + ":" + StrMinute;
if (MidnightExceeded)
IsToday = false; // For next call
document.getElementById('hm').innerHTML = PrintableClock;
setTimeout("writeClock()",60000);
}
function writeClockConnected() {
var BoxClock;
var Hours;
var Minutes;
var Seconds;
var StrMinutes;
var StrSeconds;
var PrintableClock;
countClockConnected++;
countClockConnected %= 10;
for (var i=0; i= 60) {
Hours = Math.floor(Minutes / 60);
Minutes %= 60;
} else
Hours = 0;
Seconds = ListSeconds[i] % 60;
if (Hours != 0) {
StrMinutes = ((Minutes < 10) ? "0" : "") + Minutes;
StrSeconds = ((Seconds < 10) ? "0" : "") + Seconds;
PrintableClock = Hours + ":" + StrMinutes + "'" + StrSeconds + """;
} else if (Minutes != 0) {
StrSeconds = ((Seconds < 10) ? "0" : "") + Seconds;
PrintableClock = Minutes + "'" + StrSeconds + """;
} else
PrintableClock = Seconds + """;
BoxClock.innerHTML = PrintableClock;
}
}
}
setTimeout("writeClockConnected()",1000); // refresh after 1 second
}
// Automatic refresh of connected users using AJAX. This function must be called from time to time
var objXMLHttpReqCon = false;
function refreshConnected() {
objXMLHttpReqCon = AJAXCreateObject();
if (objXMLHttpReqCon) {
var RefreshParams = RefreshParamNxtActCon + '&' + RefreshParamIdSes + '&' + RefreshParamCrsCod;
objXMLHttpReqCon.onreadystatechange = readConnUsrsData; // onreadystatechange must be lowercase
objXMLHttpReqCon.open('POST',ActionAJAX,true);
objXMLHttpReqCon.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
objXMLHttpReqCon.send(RefreshParams);
}
}
// Automatic refresh of last clicks using AJAX. This function must be called from time to time
var objXMLHttpReqLog = false;
function refreshLastClicks() {
objXMLHttpReqLog = AJAXCreateObject();
if (objXMLHttpReqLog) {
var RefreshParams = RefreshParamNxtActLog + '&' + RefreshParamIdSes + '&' + RefreshParamCrsCod;
objXMLHttpReqLog.onreadystatechange = readLastClicksData; // onreadystatechange must be lowercase
objXMLHttpReqLog.open('POST',ActionAJAX,true);
objXMLHttpReqLog.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
objXMLHttpReqLog.send(RefreshParams);
}
}
// Create AJAX object (try is unknown in earlier versions of Netscape, but works in IE5)
function AJAXCreateObject() {
var obj = false;
if (window.XMLHttpRequest) { // Mozilla, Safari,...
obj = new XMLHttpRequest();
} else if (window.ActiveXObject) { // IE
try {
obj = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
obj = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {}
}
}
return obj;
}
// Receives and show connected users data
function readConnUsrsData() {
if (objXMLHttpReqCon.readyState == 4) { // Check if data have been received
if (objXMLHttpReqCon.status == 200) {
var endOfDelay = objXMLHttpReqCon.responseText.indexOf('|',0); // Get separator position
var endOfNotif = objXMLHttpReqCon.responseText.indexOf('|',endOfDelay+1); // Get separator position
var endOfGblCon = objXMLHttpReqCon.responseText.indexOf('|',endOfNotif+1); // Get separator position
var endOfCrsCon = objXMLHttpReqCon.responseText.indexOf('|',endOfGblCon+1); // Get separator position
var endOfNumUsrs = objXMLHttpReqCon.responseText.indexOf('|',endOfCrsCon+1); // Get separator position
var delay = parseInt(objXMLHttpReqCon.responseText.substring(0,endOfDelay)); // Get refresh delay
var htmlNotif = objXMLHttpReqCon.responseText.substring(endOfDelay +1,endOfNotif); // Get HTML code for new notifications
var htmlGblCon = objXMLHttpReqCon.responseText.substring(endOfNotif +1,endOfGblCon); // Get HTML code for connected
var htmlCrsCon = objXMLHttpReqCon.responseText.substring(endOfGblCon+1,endOfCrsCon); // Get HTML code for course connected
var NumUsrsStr = objXMLHttpReqCon.responseText.substring(endOfCrsCon+1,endOfNumUsrs); // Get number of users
var startOfUsr;
var endOfUsr;
NumUsrsCon = (NumUsrsStr.length ? parseInt(NumUsrsStr) : 0);
var divNewNotif = document.getElementById('msg'); // Access to new notifications DIV
if (divNewNotif)
divNewNotif.innerHTML = (htmlNotif.length) ? htmlNotif : ''; // Update new notifications DIV
var divGblConnected = document.getElementById('globalconnected'); // Access to global connected DIV
if (divGblConnected)
divGblConnected.innerHTML = htmlGblCon; // Update global connected DIV
if (htmlCrsCon.length) {
var divCrsConnected = document.getElementById('courseconnected'); // Access to course connected DIV
if (divCrsConnected) {
divCrsConnected.innerHTML = htmlCrsCon; // Update course connected DIV
countClockConnected = 0; // Don't refresh again using writeClockConnected until past 10 seconds
startOfUsr = endOfNumUsrs + 1;
for (var NumUsr=0; NumUsr= 60000) // If refresh slower than 1 time each 60 seconds, do refresh; else abort
setTimeout("refreshConnected()",delay);
}
}
}
// Receives and show last clicks data
function readLastClicksData() {
if (objXMLHttpReqLog.readyState == 4) { // Check if data have been received
if (objXMLHttpReqLog.status == 200) {
var endOfDelay = objXMLHttpReqLog.responseText.indexOf('|',0); // Get separator position
var endOfLastClicks = objXMLHttpReqLog.responseText.indexOf('|',endOfDelay+1); // Get separator position
var delay = parseInt(objXMLHttpReqLog.responseText.substring(0,endOfDelay)); // Get refresh delay
var htmlLastClicks = objXMLHttpReqLog.responseText.substring(endOfDelay+1); // Get HTML code for last clicks
var divLastClicks = document.getElementById('lastclicks'); // Access to last click DIV
if (divLastClicks)
divLastClicks.innerHTML = htmlLastClicks; // Update global connected DIV
if (delay > 200) // If refresh slower than 1 time each 0.2 seconds, do refresh; else abort
setTimeout("refreshLastClicks()",delay);
}
}
}
// Zoom a user's photograph
function zoom(imagen,urlPhoto,shortName) {
var xPos = imagen.offsetLeft;
var yPos = imagen.offsetTop;
var tempEl = imagen.offsetParent;
while (tempEl != null) {
xPos += tempEl.offsetLeft;
yPos += tempEl.offsetTop;
tempEl = tempEl.offsetParent;
}
xPos -= (150+12);
yPos -= ((200+12)/2);
if (yPos < 0)
yPos = 0;
document.getElementById('zoomLyr').style.left = xPos + 'px';
document.getElementById('zoomLyr').style.top = yPos + 'px';
document.getElementById('zoomImg').src = urlPhoto;
document.getElementById('zoomTxt').innerHTML = '' + shortName + '';
}
// Exit from zooming a user's photograph
function noZoom(imagen) {
var xPos = -(150+12);
var yPos = -(200+12+88);
document.getElementById('zoomTxt').innerHTML = '';
document.getElementById('zoomImg').src='/icon/_.gif';
document.getElementById('zoomLyr').style.left = xPos + 'px';
document.getElementById('zoomLyr').style.top = yPos + 'px';
}
// Select or unselect a radio element in a form
function selectUnselectRadio (radio,groupRadios,numRadiosInGroup){
if (radio.IsChecked) radio.checked = false;
radio.IsChecked = !radio.IsChecked;
for (var i=0; i Days) DayForm.options[Days].selected = true;
for (var i=DayForm.options.length; i<=Days ; i++) // Create new days at start
{ var x = String (i); DayForm.options[i] = new Option(x,x); }
for (var i=DayForm.options.length-1; i>Days; i--) // Remove days at the end
DayForm.options[i] = null;
}
// Set a the date in a date form to a specified date
function setDateTo (elem,Day,Month,Year) {
document.getElementById('StartYear').options[Year].selected = true;
document.getElementById('StartMonth').options[Month].selected = true;
adjustDateForm (elem.form.StartDay,elem.form.StartMonth,elem.form.StartYear)
document.getElementById('StartDay').options[Day].selected = true;
document.getElementById('EndYear').options[Year].selected = true;
document.getElementById('EndMonth').options[Month].selected = true;
adjustDateForm (elem.form.EndDay,elem.form.EndMonth,elem.form.EndYear)
document.getElementById('EndDay').options[Day].selected = true;
}
// Adjust iFrame height to height of browser
function iFrameHeight () {
var h;
if (document.getElementById) {
if (self.innerHeight) // all except Explorer
h = self.innerHeight;
else if (document.documentElement && document.documentElement.clientHeight)
// Explorer 6 Strict Mode
h = document.documentElement.clientHeight;
else if (document.body) // other Explorers
h = document.body.clientHeight;
if (h == 0) h = 480;
else {
h = h - 210;
if (h < 200) h = 200;
}
document.getElementById('iframe_central').style.height = h;
}
}
// Change text of a test descriptor
function changeTxtTag(NumTag){
var Sel = document.getElementById('SelDesc'+NumTag);
document.getElementById('TagTxt'+NumTag).value = Sel.options[Sel.selectedIndex].value;
}
// Change selectors of test descriptors
function changeSelTag(NumTag){
var Sel = document.getElementById('SelDesc'+NumTag);
var Txt = document.getElementById('TagTxt'+NumTag);
for (var i=0; i