moparscape.org-smf/Themes/default/scripts/captcha.js

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// This file contains javascript associated with the captcha visual verification stuffs.
function smfCaptcha(imageURL, uniqueID, useLibrary, letterCount)
{
// By default the letter count is five.
if (!letterCount)
letterCount = 5;
uniqueID = uniqueID ? '_' + uniqueID : '';
autoCreate();
// Automatically get the captcha event handlers in place and the like.
function autoCreate()
{
// Is there anything to cycle images with - if so attach the refresh image function?
var cycleHandle = document.getElementById('visual_verification' + uniqueID + '_refresh');
if (cycleHandle)
{
createEventListener(cycleHandle);
cycleHandle.addEventListener('click', refreshImages, false);
}
// Maybe a voice is here to spread light?
var soundHandle = document.getElementById('visual_verification' + uniqueID + '_sound');
if (soundHandle)
{
createEventListener(soundHandle);
soundHandle.addEventListener('click', playSound, false);
}
}
// Change the images.
function refreshImages()
{
// Make sure we are using a new rand code.
var new_url = new String(imageURL);
new_url = new_url.substr(0, new_url.indexOf("rand=") + 5);
// Quick and dirty way of converting decimal to hex
var hexstr = "0123456789abcdef";
for(var i=0; i < 32; i++)
new_url = new_url + hexstr.substr(Math.floor(Math.random() * 16), 1);
if (useLibrary && document.getElementById("verification_image" + uniqueID))
{
document.getElementById("verification_image" + uniqueID).src = new_url;
}
else if (document.getElementById("verification_image" + uniqueID))
{
for (i = 1; i <= letterCount; i++)
if (document.getElementById("verification_image" + uniqueID + "_" + i))
document.getElementById("verification_image" + uniqueID + "_" + i).src = new_url + ";letter=" + i;
}
return false;
}
// Request a sound... play it Mr Soundman...
function playSound(ev)
{
if (!ev)
ev = window.event;
popupFailed = reqWin(imageURL + ";sound", 400, 120);
// Don't follow the link if the popup worked, which it would have done!
if (!popupFailed)
{
if (is_ie && ev.cancelBubble)
ev.cancelBubble = true;
else if (ev.stopPropagation)
{
ev.stopPropagation();
ev.preventDefault();
}
}
return popupFailed;
}
}