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var gif_url;
// strings containing the names of all active GifDisplays
var active_displays_l = new Array();
// the current displayFrame
var current_display;
// the list of displayFrame objects
var displays_l = new Array();
function displayFrame(name)
{
this.name = name;
this.is_viewed = false;
this.viewed_l = new Array();
}
/*
This function is called onload. It creates the list of
displayFrame objects.
*/
function fillDisplayList()
{
var iframes_l = document.getElementsByTagName("iframe");
for (i = 0; i < iframes_l.length; i++)
{
displays_l[i] = new displayFrame(iframes_l[i].id);
}
// the default current is the first:
current_display = displays_l[0];
}
function makeCurrent(display_frame_name)
{
for (i = 0; i < displays_l.length; i++)
{
if (displays_l[i].name == display_frame_name)
{
break;
}
}
current_display = displays_l[i];
}
/*
Returns true if the display frame provided as an argument
is currently being viewed.
*/
function isViewed(display_frame_name)
{
for (i = 0; i < active_displays_l.length; i++)
{
if (active_displays_l[i] == display_frame_name)
{
return true;
}
}
return false;
}
//*************************************************************/
/*
These functions get called if the user clicks on the "start viewing"
or "stop viewing" buttons of a display frame. They set the is_viewed
field of the displayFrame object.
*/
function getDisplayFrame(display_frame_name)
{
for (i = 0; i < displays_l.length; i++)
{
if (displays_l[i].name == display_frame_name)
return displays_l[i];
}
}
function startViewing(display_frame_name)
{
var display = getDisplayFrame(display_frame_name);
if (display.is_viewed)
{
alert('This GifViewer is already active');
return;
}
display.is_viewed = true;
updateDisplay(display_frame_name);
}
function stopViewing(display_frame_name)
{
var display = getDisplayFrame(display_frame_name);
display.is_viewed = false;
}
/*
This function is initially called when the "start viewing" button
of a display frame is pressed and keeps calling itself every
[interval] msec, refreshing the frame until it becomes inactive.
*/
function updateDisplay(display_frame_name)
{
var interval = 5000;
var display_frame = getDisplayFrame(display_frame_name);
if (display_frame.is_viewed == true)
{
makeDisplayRequest(display_frame_name);
if (display_frame.viewed_l.length != 0)
{
window.frames[display_frame_name].location.href = getGifURL(display_frame_name);
}
}
var this_function_call = "updateDisplay('" + display_frame_name + "')";
setTimeout(this_function_call, interval);
}
//*************************************************************/
function getGifURL(display_frame_name)
{
var url = getContextURL();
url = url + "/temporary/" + display_frame_name + ".gif";
return url;
}
//*************************************************************/
function getDisplayRequestURL(display_frame_name)
{
url = getApplicationURL();
url = url + "/Request"
url = url + "?" + "RequestID=Draw"
url = url + "&" + "Current=" + contentViewer_current;
url = url + "&" + "DisplayFrameName=" + display_frame_name;
var display_frame = getDisplayFrame(display_frame_name);
for (i = 0; i < display_frame.viewed_l.length; i++)
{
url = url + "&" + "View=" + display_frame.viewed_l[i];
}
return url;
}
//*************************************************************/
function makeDisplayRequest(display_frame_name)
{
url = getDisplayRequestURL(display_frame_name);
// pass a reference to the updateGifURL function:
makeRequest(url, updateGifURL);
}
//*************************************************************/
function updateGifURL()
{
if (http_request.readyState == 4)
{
if (http_request.status == 200)
{
var xmldoc;
// Load the xml elements on javascript lists:
if (http_request != false)
{
xmldoc = http_request.responseXML;
gif_url = xmldoc.getElementsByTagName('fileURL').item(0).firstChild.data;
}
}
}
}
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