From ccf76e430b7703db028966a845a966f50956f490 Mon Sep 17 00:00:00 2001
From: xue <>
Date: Mon, 5 Dec 2005 01:00:16 +0000
Subject:

---
 framework/Web/Javascripts/base/focus.js | 99 +++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 framework/Web/Javascripts/base/focus.js

(limited to 'framework/Web/Javascripts/base/focus.js')

diff --git a/framework/Web/Javascripts/base/focus.js b/framework/Web/Javascripts/base/focus.js
new file mode 100644
index 00000000..6c1359cd
--- /dev/null
+++ b/framework/Web/Javascripts/base/focus.js
@@ -0,0 +1,99 @@
+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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