DBLookup with JavaScript and XPath

DBLookup with JavaScript and XPath

This code is my own version of a JavaScript DBLookup using XPath. It works with both categorized and non-categorized views. It is for Internet Explorer only. 

function dbLookup(dblDatabase,
dblView,dblKey,dblColumn,dblLimit){
//David Schmidt, 2005-10-27
try{
 dblColumn=dblColumn-1;
 var xmldoc=new ActiveXObject
("MSXML2.DOMDocument");
 xmldoc.async=false;
 docLimit=(dblLimit!="")?dblLimit:"-1";
 xmldoc.load("/"+dblDatabase+"/"+dblView+"
?readviewentries&expandview&PreFormat&count="
+docLimit);
 if(xmldoc.parseError.errorCode!=0){
  var xmlerror=xmldoc.parseError;
  errorstr="XSL error\n\nError code: "
+xmlerror.errorCode+"\nReason: "+
xmlerror.reason+"\nLine: "+xmlerror.line+"\nLine position: 
"+xmlerror.linepos+"\nsrcText: "
+xmlerror.srcText+"\nUrl:"+xmlerror.url+"\nFile position: 
"+xmlerror.filepos;
  alert(errorstr);
  return "error";
 }else{
  columnNode=xmldoc.documentElement.selectNodes
("/viewentries/viewentry/entrydata[@columnnumber='0' 
and .='"+dblKey+"']");
  dblArray=new Array();
  if(columnNode.length>0){
   if(columnNode.item(0).getAttribute("category")){
     NodePosition=
columnNode.item(0).parentNode.getAttribute("position");
     xmldoc.setProperty("SelectionLanguage", "XPath");
     xpathquery=
"/viewentries/viewentry/entrydata[starts-with
(../@position,'"+NodePosition+".') and 
@columnnumber="+dblColumn+"]";
     categoryNode= 
xmldoc.documentElement.selectNodes(xpathquery);

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     for(x=0;x<categoryNode.length;x++){
      dblArray[x]=categoryNode[x].childNodes(0).text;
     }
   }else{
    for(x=0;x<columnNode.length;x++){
     dblArray[x]=
columnNode[x].parentNode.childNodes(dblColumn).text;
    }
   }
  }
  return dblArray;
}
}catch(e){
 var errName=e.name;
 var errNumber=e.number & 0xFFFF;
 var errDescription=e.description;
 errMessage=e+"\n\nName: "+errName+"\nNumber: "
+errNumber+"\nDescription: "+errDescription;
 alert(errMessage);
 return error;
}
}

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This was first published in October 2005

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