/****************************************************/
/* */
/* Script: picWin */
/* */
/* Author: Jim Salyer */
/* */
/* Purpose: This script displays an image at its */
/* exact dimensions in a pop-up window and */
/* can handle a given number of windows at */
/* a time, closing old ones to make room */
/* for new ones. This version also */
/* displays a "Loading Image..." window so */
/* the viewer knows what's going on. */
/* */
/****************************************************/
// determine the viewer's browser compatibility
var isComp = (document.all || document.layers || document.getElementById) ? true : false;
var picWins = new Array(); // array of windows
var maxWins = 3; // maximum # of windows that can be open at one time
var counter = 0; // counter to count up the # of windows that are open
var loader = null; // temporary loading window
var img = null; // image object
var initString; // function initialization string
var winNum; // window id holder
var winParms; // window parameters string
var winString; // HTML to write into the image window
var randNum; // random number holder for window id
var i; // global loop counter
function picWin(loc, name)
{
// error handler for old and third-party browsers
if (!isComp)
{
alert("Your browser is not compatible with this script.");
return;
}
// open temporary loading window
loader = window.open("", "", "location=no,menubar=no,toolbar=no,scrollbars=no,status=no," +
"height=100,width=200,left=" + (screen.width/2 - 100) + ",top=" + (screen.height/2 - 50));
loader.document.open();
loader.document.write('
Loading Image...
');
loader.document.close();
loader.focus();
// initialize image and window
img = new Image();
img.src = loc;
initWin(loc, name);
}
function initWin(loc, name)
{
// if the image has dimensions, open the window
// if not, wait until it does
if (img.height != 0 && img.width != 0)
openWin(loc, name);
else
{
initString = "initWin(\"" + loc + "\", \"" + name + "\")";
setTimeout(initString, 20);
}
}
function openWin(loc, name)
{
// remove closed windows from array
closePicWin();
// check if this image is already open
if (checkOpen(loc))
{
loader.close();
alert(loc + "\ris already open.");
return;
}
// error handler for random errors
if (img.height == 0 || img.width == 0)
{
loader.close();
alert("An error occurred while loading " + loc + ".");
return;
}
winNum = genWinID(); // create window id
// initialize parameters for the new window (scroll bars, toolbar, etc.)
winParms = "copyhistory=no,directories=no,location=no,menubar=no,resizable=no,scrollbars=no," +
"status=no,toolbar=no,height=" + (img.height + 25) + ",width=" + img.width + ",left=" +
(screen.width/2 - img.width/2) + ",top=" + (screen.height/2 - (img.height+25)/2);
// check if maximum number of windows are open
// if the max has been reached, close the first window
if (counter >= maxWins)
{
picWins.shift().close();
counter--;
}
// write content to be loaded into the new window
winString = "";
winString += '';
winString += '';
winString += '' + name + '';
winString += '';
winString += '';
winString += '';
winString += '
';
winString += '';
winString += '';
// close temporary loading window
// open new window and add it to the active window array
loader.close();
picWins.push(window.open("", winNum, winParms));
// load content into the new window
var currWin = picWins.length - 1;
picWins[currWin].document.open;
picWins[currWin].document.write(winString);
picWins[currWin].document.close();
picWins[currWin].focus();
counter++; // increment window counter
}
function genWinID()
{
randNum = parseInt(Math.random() * 1000);
for (var i=0; i