Library tutorials & articles
Simple DOM Access
- Introduction
- JavaScript functions
- Client Code
- Simple SDA Access
- Live Example
Simple SDA Access
sda.js
var simpleDOMAccessDoc;
var sCurrentNodeKey;
sCurrentNodeKey="root";
var goBottomNode;
/*
Purpose: Returns the current key value.
Used with the next and previous
methods
*/
function getCurrentNodeKey()
{
return(sCurrentNodeKey);
}
/*
Purpose: Sets the current key
value. Used with the next and
previous methods.
*/
function setCurrentNodeKey(sKey)
{
sCurrentNodeKey=sKey;
}
/* purpose: provides navigation
forward through the xml tree.
Rule 1: check for a descendant
Rule 2: check for a sibling
Rule 3: check for parent nodes sibling
*/
function next()
{
var oNode;
var oCurrentNode;
var oOldNode;
var sRetText;
oNode=getNode(sCurrentNodeKey);
sRetText="";
/*Rule 1 - Check for a Descendant */
oCurrentNode=oNode.firstChild;
/*Rule 2 - Check for a Sibling */
if(oCurrentNode==null)
{
oCurrentNode=oNode.nextSibling;
}
/*Rule 3 - Check for Parent Node' Sibling */
if(oCurrentNode==null)
{
oCurrentNode=oNode.parentNode;
while (oCurrentNode!=null)
{
oOldNode=oCurrentNode;
oCurrentNode=oCurrentNode.nextSibling;
if (oCurrentNode==null)
{
oCurrentNode=oOldNode.parentNode;
}
else
{
sCurrentNodeKey=oCurrentNode.getAttribute("key");
break;
}
}
}
if (oCurrentNode != null)
{
sCurrentNodeKey=oCurrentNode.getAttribute("key");
sRetText=oCurrentNode.getAttribute("key");
}
else
{
sRetText=oNode.getAttribute("key");
}
return(sRetText);
}
/*
Purpose: provides navigation
back through the xml tree.
Rule 1&2- Find Sibling Node - Find the bottom-most child of the sibling*/
Rule 3 - Find Parent Node
*/
function previous()
{
var oNode;
var oCurrentNode;
var oOldNode;
var sRetText;
sRetText="";
/* Rule 1 - Find Sibling - Find the bottom-most child of
the sibling*/
oNode=getNode(sCurrentNodeKey);
oCurrentNode=oNode.previousSibling;
/* Rule 2 - Find Siblings bottom of the tree*/
if (oCurrentNode!=null)
{
goBottomNode=null;
bottomOfTree(oCurrentNode);
oCurrentNode=goBottomNode;
}
/* Rule 3 - Find Parent*/
if (oCurrentNode==null)
{
oOldNode=oCurrentNode;
oCurrentNode=oNode.parentNode;
if (oCurrentNode.getAttribute("key")=="root")
{
oCurrentNode=oOldNode;
}
}
if (oCurrentNode != null)
{
sCurrentNodeKey=oCurrentNode.getAttribute("key");
sRetText=oCurrentNode.getAttribute("key");
}
else
{
sRetText=oNode.getAttribute("key");
}
return(sRetText);
}
function simpleDOMAccessClass()
{
var sXML;
simpleDOMAccessDoc=new ActiveXObject("Microsoft.XMLDOM");
sXML="<xml>";
sXML=sXML+"<node parent_key=\'na\' key=\'root\' element_name=\'content\' >";
sXML=sXML+"</node>";
sXML=sXML+"</xml>";
simpleDOMAccessDoc.async = 0;
simpleDOMAccessDoc.loadXML(sXML);
}
/*Purpose: Add a node to the xml tree
1)Search for the parent node
2)Assign attribute values to the new node
3)Insert the new node into the xml tree
*/
function addNode(sParent_Key,sKey,sElementName)
{
var oNewNode;
var oParentNode;
var sCriteria;
oNewNode=simpleDOMAccessDoc.createElement("node");
/* 1-Search for Parent Node Match */
sCriteria="//node[@key $eq$ \ '"+sParent_Key+"\']";
oParentNode=simpleDOMAccessDoc.selectSingleNode(sCriteria);
/* 2-Insert new Node into Document Object Model (dom) structure*/
if(oParentNode!=null)
{
oNewNode.setAttribute("parent_key",sParent_Key);
oNewNode.setAttribute("key",sKey);
oNewNode.setAttribute("element_name",sElementName);
oParentNode.appendChild(oNewNode);
}
}
function setAttribute(sKey,sAttribute_Name,sValue)
{
var oNode;
oNode=getNode(sKey);
if (oNode != null)
{
oNode.setAttribute(sAttribute_Name,sValue);
}
}
function removeAttribute(sKey,sAttribute_Name)
{
var oNode;
oNode=getNode(sKey);
if (oNode != null)
{
oNode.removeAttribute(sAttribute_Name);
}
}
function bottomOfTree(oNode)
{
goBottomNode=oNode;
if (oNode.hasChildNodes()>0)
{
bottomOfTree(oNode.lastChild);
}
}
function traverseTree(oNode)
{
var oAttribute;
var sAttribute_Name;
var sAttribute_Value;
var sBuffer;
var i;
document.write("<dl>");
do
{
sBuffer=" attributes=(";
for (i=0; i<oNode.attributes.length; i++)
{
oAttribute=oNode.attributes[i];
sAttribute_Name=oAttribute.name;
sAttribute_Value=oAttribute.value;
sBuffer=sBuffer+sAttribute_Value+" ";
}
sBuffer=sBuffer+")";
document.write("<dt><ddr>"+oNode.getAttribute("element_name")+"
"+sBuffer);
if (oNode.hasChildNodes()>0)
{
traverseTree(oNode.firstChild);
}
oNode=oNode.nextSibling;
}
while(oNode != null);
document.write("</dl>");
}
/*Purpose:locate a specific node in the
xml structure by its "key" value
*/
function getNode(sKey)
{
var oNode;
sCriteria="//node[@key $eq$ \ '"+sKey+"\']";
oNode=simpleDOMAccessDoc.selectSingleNode(sCriteria);
if(oNode != null)
{
return(oNode);
}
else
{
alert("Node not found");
}
}
function getSimpleDOMAccessDocument()
{
return(simpleDOMAccessDoc);
}
/*Purpose: remove a node from the xml tree
1)Find the node
2)Find the node's parent
3)Invoke the parents removeChild method deleting
the node and its descendants from the xml tree.
*/
function deleteNode(sKey)
{
var oNode;
var oParentNode;
var sParent_Key;
oNode=getNode(sKey);
if (oNode != null)
{
sParent_Key=oNode.getAttribute("parent_key");
oParentNode=getNode(sParent_Key);
if (oParentNode != null)
{
oParentNode.removeChild(oNode);
}
}
}
var sda=new simpleDOMAccessClass();
sda.addNode=addNode;
sda.getNode=getNode;
sda.traverseTree=traverseTree;
sda.next=next;
sda.previous=previous;
sda.setAttribute=setAttribute;
sda.removeAttribute=removeAttribute;
sda.deleteNode=deleteNode;
sda.getCurrentNodeKey=getCurrentNodeKey;
sda.setCurrentNodeKey=setCurrentNodeKey;
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