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Title XML Advertising
Description XML and ASP solution for your advertising needs. Not only shall we display adverts, but also record number of impressions and click through's!
Category ASP » XML
Hits 379355
Code Select and Copy the Code
Ok; firstly, we have To identify the information we want To store. We need the actual advertising image, where the click Is To go To (target), And To keep proper HTML an ALTernative tag. Then we need To store the important information such As impressions And click through. So, we End up With a relatively simply XML structure. <advertlist> <advert clicks="0" impressions="0"> <id /> <url /> <image /> <alt /> <datecreated /> </advert> </advertlist> You'll also see that I've added a datecreated field, and a rather important ID field. The datecreated field is simply for information purposes. However, the ID field is used to uniquely identify adverts. This is used for efficiency, and to uniquely identify adverts quickly and easily! A typically populated file may be: <advertlist> <advert clicks="0" impressions="0"> <id>1</id> <url /> <image /> <alt /> <datecreated /> </advert> </advertlist> Now that we have defined the information we need, Next we need To define a way To display it. By using XSL this Is made relatively simple: <render id="displayadvert"> <html> <head> <title>XML Advertising</title> <meta name="Author" content="George Leithead" /> <meta name="AuthorContact" content="Code.Samples@InternetWideWorld.com" /> </head> <body> <table border="0" cellpadding="0" cellspacing="0" summary="Advert and Home page"> <tr> <td><A TARGET="_top"><xsl:attribute name="HREF">RecordMe.asp?id=<xsl:value-of Select="id"/>&url=<xsl:value-of Select="url"/>&image=<xsl:value-of Select="image"/></xsl:attribute><IMG BORDER="1" WIDTH="468" height="60"><xsl:attribute name="SRC"><xsl:value-of Select="image"/></xsl:attribute><xsl:attribute name="ALT"><xsl:value-of Select="alt"/></xsl:attribute></IMG></A><img src="http://forums.internetwideworld.com/Images/Blank.gif" width="1" height="1" alt="Weavel" /></td> </tr> </table> </body> </html> </render> Now we have our information, And a template To display it In, we Now need To Select an advert And display it using the XSL. In order To Do this, firstly we need Do implement a couple of functions. The first Is To load the actual XML source And the XSL style. Then we need a Function that transforms the XML And XSL To produce our required HTML. ' Define where the XML and XSL files can be found. ' Usually, put these two lines in the GLOBAL.ASA file! Application("AdPathXML") = Server.MapPath("Adverts.xml") ' Where the adverts are! Application("AdPathXSL") = Server.MapPath("Advertising.xsl") ' Where the adverts are! Function LoadAdverts() ' Create the links to the XML and XSL files Dim oSource Dim oStyle Set oSource = Server.CreateObject("Microsoft.FreeThreadedXMLDOM") oSource.async = False oSource.load Application("AdPathXML") ' Load the XML file!! Set oStyle = Server.CreateObject("Microsoft.FreeThreadedXMLDOM") oStyle.async = False oStyle.load Application("AdPathXSL") ' Load the XSL file!! Application.Lock Set Application("Advertsource") = oSource Set Application("Advertstyle") = oStyle Application.UnLock ' Tidy Up!!! Set oSource = Nothing Set oStyle = Nothing End Function Function DisplayAdvert(iID, sRender) ' Display a selected advert in the selected render style ' Simply supply the Advert ID and the render Dim oRequiredNode Dim oSource Dim oStyle Dim oOutNode Set oStyle = Application("Advertstyle") Set oSource = Application("Advertsource") Set oRequiredNode = oSource.selectSingleNode("advertlist/advert[id[. = """ & iID & """]]") If Not oRequiredNode Is Nothing Then Set oOutNode = oStyle.selectSingleNode("xsl:stylesheet/render[@id=""" & sRender & """]") If Not oOutNode Is Nothing Then ' Apply the style to the source! DisplayAdvert = oRequiredNode.transformNode(oOutNode) Else DisplayAdvert = "ERROR: Either the XSL file is incorrect or the render identifier is not found" End If Else DisplayAdvert = "ERROR: Either the advert identifier supplied is invalid of not found" End If ' Tidy Up!!! Set oOutNode = Nothing Set oRequiredNode = Nothing Set oStyle = Nothing Set oSource = Nothing End Function You'll notice that the DisplayAdvert function accepts two arguments, iID and sRender. The iID argument is the ID of the advert we wish to display, and the sRender argument allows us to specify the XSL style sheet we want to apply. That is, we can display the advert in a number of formats. So, we Now need To obtain the advert ID that we want To display. I've done this by randomly selecting a number between one and the maximum number of adverts that are available. Below you can see the code to do this. You'll also notice that there is some code in there to make sure that the selected advert ID actually exists, and if not, we select another random advert id. The code below is the actual advertising page. <%@ Language=VBScript %><% Option EXPLICIT%> <!--#INCLUDE FILE="Display_Advertising.inc.asp"--><% Dim oRoot ' The XML Root Object Dim oNode ' An XML Node object Dim iMaxID: iMaxID= 0 ' The Maximum ID of an Advert within the Root! Dim iAdvertNum: iAdvertNum= 1 ' The actual advert ID we are going to show! Dim bAdvertExists : bAdvertExists = False ' By default the advert does not exist! Dim iTimes: iTimes= 0 ' Record hw many times we've been round the loop! Dim iMaxTimes : iMaxTimes = 10' Maximum number of attempts before giving up! Dim sOutput: sOutput= ""' The output of the transformation ' Get the Advert source! Set oRoot = Application("Advertsource") ' Get the ROOT Node! Set oNode = oRoot.selectSingleNode("advertlist") On Error Resume Next ' Get the MAX ID of the Nodes within the root! iMaxID = CLng(oNode.lastChild.selectSingleNode("id").text) ' Make it a number! If Err.number <> 0 Then ' Saftey check! ' The Node does NOT contain any records!!! iMaxID = 0 Err.Clear() End If On Error goto 0 Set oNode = Nothing ' Tidy Up!!! Set oRoot = Nothing ' Tidy Up!!! ' Only IF there is an advert, do we want to get it! If iMaxID > 0 Then While (Not bAdvertExists) iTimes = iTimes + 1 ' Add 1 to the loop counter! Randomize() iAdvertNum = Int(iMaxID * Rnd + 1) ' Get an Advert ID Number ' Obviously, we need to ensure that the advert actually EXISTS!!! Set oNode = getAdvertFromID(iAdvertNum) ' Get the Node! If oNode Is Nothing Then ' This Advert ID does NOT exist!!! 'Response.Write("The advert number " & CStr(iAdvertNum) & " does not exist!") Else bAdvertExists = True ' The advert DOES exist! Call RecordImpression(iAdvertNum) ' Need to record the view impression!!!! sOutput = DisplayAdvert(iAdvertNum, "displayadvert") Response.Write(sOutput) ' Transform the XML output! End If Set oNode = Nothing ' Tidy Up!!! If iTimes > iMaxTimes Then bAdvertExists = True ' Limit the number of tries to 10...DON'T want to INFINATE loop!!! Wend If (Not bAdvertExists) Then Response.Write("No Adverts defined!") End If End If%>

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