Summary Passing values into XSLT from ASP with an eye to overall performance and scalability of the web application.

Additional information

<!--setting up IXSLTemplate in global.asa--> <object id="Template" progid="Msxml2.XSLTemplate.3.0" runat="server" scope="application"></object> <script language="JScript" runat="server"> function Application_OnStart() { var XSLT = Server.CreateObject("Msxml2.FreeThreadedDOMDocument.3.0"); with (XSLT) { async = false; load(Server.MapPath("xslt/default.xsl")); //If No Errors Encountered, set the Template stylesheet //to the XSLT Object if (parseError.errorCode == 0) Template.stylesheet = XSLT; } //de-reference XSLT delete XSLT; //Set the variable to null to free resources XSLT = null; } </script> <!--Part 2: Calling the IXSLProcessor from an ASP Page--> <!--page1.asp--> <%@language="JScript"> <%Response.Buffer = true;%> <% //Notice here we don't have to instantiate a //Free Threaded DOM Object //which consumes more resources than //the Apartment Model DOM Object try { var XML = Server.CreateObject("Msxml2.DOMDocument.3.0"); with (XML) { async = false; load(Server.MapPath("data/data.xml")); with (XML.parseError) { if (errorCode == 0) { //Here we create the IXSLProcessor var Proc = Application.StaticObjects("Template").createProcessor(); if (Proc != null) { with (Proc) { input = XML; output = Response; addParameter("param1","yes"); transform(); } //delete object as soon as you can delete Proc; Proc = null; } else { throw "<div>IXSLProcessor Object could not be created.</div>"; } } else { throw "<div>XML Error (" + errorCode + ")<br />Reason: " + reason + "<br />Line: " + line + "</div>"; } } } //delete object as soon as you can delete XML; XML = null; } catch (e) { with (Response) { if (e == "[object Error~") { Write("<div>Runtime Error (" + e.number + ") Encountered</div>"); Write("<div>Description: " + e.description + "</div>"); } else { Write(e); } } } finally { if (typeof(XML) == "object" && XML != null) { delete XML; XML = null; } if (typeof(Proc) == "object" && Proc != null) { delete Proc; Proc = null; } CollectGarbage(); } /* We have only two objects instantiated in this page versus 4 if you create the IXSLTemplate in the page scope The next example shows how to pass parameters to ASP without using the expensive IXSLTemplate method in the page scope if you do not want to cache your stylesheets */ %> <!--end of Example of how to use the IXSLTemplate Properly--> <!--Generic JScript Function To Emulate IXSLProcessor Methods--> <!--Used To Provide Similar Interface But No Caching Of Stylesheets--> <% function Processor() { var XML = XSLT = errXSLT = errXML = null; this.stylesheet = function(param) { XSLT = SetXMLObject(param); if (XSLT == null) errXSLT = true; }; this.input = function(param) { XML = SetXMLObject(param); if (XML == null) errXML = true; }; this.addParameter = function(name,value) { if (XSLT != null && errXSLT == null ) { var oParam = XSLT.selectSingleNode("//xsl:param[@name='" + name + "'~"); if (oParam != null) { oParam.text = value; delete oParam; oParam = null; } } }; this.transform = function() { if (errXSLT == null && errXML == null && XML != null && XSLT != null) { XML.transformNodeToObject(XSLT,Response); } }; this.cleanup = function() { if (XML != null) { delete XML; XML = null; } if (XSLT != null) { delete XSLT; XSLT = null; } CollectGarbage(); }; } function SetXMLObject(param) { try { var oDOM = Server.CreateObject("Msxml2.DOMDocument.3.0"); with (oDOM) { async = false; if (String(param).indexOf(">") != -1) { loadXML(param); } else { load(Server.MapPath(param)); } with (oDOM.parseError) { if (errorCode != 0) { throw "<div>Parser Error: " + errorCode + "/nReason: " + reason + "/nLine: " + line + "</div>"; } } } return oDOM; } catch (e) { with (Response) { if (e == "[object Error~") { Write("<div>Runtime Error (" + e.number + ") Encountered.</div>"); Write("<div>Description: " + e.description + "</div>"); } else { Write(e); } } if (typeof(oDOM) == "object" && oDOM != null) { delete oDOM; oDOM = null; } return null; } } %>