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Prado.Focus = Class.create();
Prado.Focus.setFocus = function(id)
{
var target = document.getElementById ? document.getElementById(id) : document.all[id];
if(target && !Prado.Focus.canFocusOn(target))
{
target = Prado.Focus.findTarget(target);
}
if(target)
{
try
{
target.focus();
target.scrollIntoView(false);
if (window.__smartNav)
{
window.__smartNav.ae = target.id;
}
}
catch (e)
{
}
}
}
Prado.Focus.canFocusOn = function(element)
{
if(!element || !(element.tagName))
return false;
var tagName = element.tagName.toLowerCase();
return !element.disabled && (!element.type || element.type.toLowerCase() != "hidden") && Prado.Focus.isFocusableTag(tagName) && Prado.Focus.isVisible(element);
}
Prado.Focus.isFocusableTag = function(tagName)
{
return (tagName == "input" || tagName == "textarea" || tagName == "select" || tagName == "button" || tagName == "a");
}
Prado.Focus.findTarget = function(element)
{
if(!element || !(element.tagName))
{
return null;
}
var tagName = element.tagName.toLowerCase();
if (tagName == "undefined")
{
return null;
}
var children = element.childNodes;
if (children)
{
for(var i=0;i<children.length;i++)
{
try
{
if(Prado.Focus.canFocusOn(children[i]))
{
return children[i];
}
else
{
var target = Prado.Focus.findTarget(children[i]);
if(target)
{
return target;
}
}
}
catch (e)
{
}
}
}
return null;
}
Prado.Focus.isVisible = function(element)
{
var current = element;
while((typeof(current) != "undefined") && (current != null))
{
if(current.disabled || (typeof(current.style) != "undefined" && ((typeof(current.style.display) != "undefined" && current.style.display == "none") || (typeof(current.style.visibility) != "undefined" && current.style.visibility == "hidden") )))
{
return false;
}
if(typeof(current.parentNode) != "undefined" && current.parentNode != null && current.parentNode != current && current.parentNode.tagName.toLowerCase() != "body")
{
current = current.parentNode;
}
else
{
return true;
}
}
return true;
}
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