Error message in COLDfusion

Perhaps add an argument to your login method

<cfset err = "invalid username or password">

<cfset strFrontEnd.body = DisplayLoginForm(err)>


Btw, why does this line
 <cfset strFrontEnd.body = DisplayLoginForm()>
Appear before validating login?  Shouldn't it be after?
You would want to show the login page, if the user is not validated...

if the usre is not validated I want them to be redirected to the same page so they can login again

you may have this already throughout your app and I'm not seeing it, but normally I may see it in this order, processing the login before knowing whether or not to display the login form...

 --- is the user attempting to login right now?
<cfif isDefined ("form.txtUserName") and isDefined ("form.txtPassword")>
    check database for user and password
   <cfif login was successfull>
        define session
    </cfif>
</cfif>
<cfif NOT session.user.loggedIn>   --- is the session in place for the user
   show login page
   stop all other processing
</cfif>


again, you may be all set with this, so if you are, please ignore.  
 

Well I am providing auathentication against Active directory . But I have the same structure too. I added the arguments but still can not display the form
<cfcomponent displayname="login2" extends="tool">
<cffunction name="init" access="public" returntype="any" output="false">
            <cfargument name="CompanyID" required="true" type="numeric">            
            <cfargument name="webid" required="false" default="0">
            <cfargument name="datatype" required="false" default="0">
           
            <cfset super.init(CompanyID, arguments.webID, arguments.datatype)>
             <!--- create objects --->
            <cfset this.navigation = createObject("component", "hb50.navigation").init(CompanyID)>
            <cfset this.workflow = createObject("component", "hb50.workflow").init(CompanyID)>
            <cfset this.display = createObject("component", "hb50.display").init(CompanyID)>
            <cfset this.media = createObject("component", "hb50.media").init(this.CompanyID)>
            <cfset this.blnContent = true>
           
            <cfscript>
                  this.homeData = newFormData();
                  this.homeData.tablename = "tblExtranetOptions";
                  this.homeData.title = "Extranet Login Options";
                  columns = ArrayNew(1);
                 
                  xmlNav = this.navigation.getPublicNavXML();
                  x = StructNew();
                  x.varname = "optDefaultPage";
                  x.title = "Extranet Logged In Default Page";
                  x.type = TYPES.SELECT;
                  x.xml = xmlNav;
                  x.required = true;
                  x.multiple = FALSE;
                  ArrayAppend(columns, x);
                 
                  x = StructNew();
                  x.varname = "optLoggedOutDefaultPage";
                  x.title = "Extranet Logged Out Default Page";
                  x.type = TYPES.SELECT;
                  x.xml = xmlNav;
                  x.required = false;
                  x.multiple = FALSE;
                  ArrayAppend(columns, x);
                 
                  x = StructNew();
                  x.varname = "blnLDAP";
                  x.title = "Use LDAP for Authentication";
                  x.type = TYPES.BOOLEAN;
                  x.required = false;
                  ArrayAppend(columns, x);
                 
                  x = StructNew();
                  x.varname = "txtForgotPass";
                  x.title = "Forgot Password";
                  x.type = TYPES.HTML;
                  x.required = true;
                  ArrayAppend(columns, x);
                 
                  x = StructNew();
                  x.varname = "txtSuccessEmail";
                  x.title = "Password Emailed";
                  x.type = TYPES.HTML;
                  x.required = true;
                  ArrayAppend(columns, x);
                 
                  x = StructNew();
                  x.varname = "txtUnSuccessEmail";
                  x.title = "Password Not Emailed";
                  x.type = TYPES.HTML;
                  x.required = true;
                  ArrayAppend(columns, x);

                  x = StructNew();
                  x.varname = "txtLoginMessage";
                  x.title = "Login";
                  x.type = TYPES.HTML;
                  x.required = true;
                  ArrayAppend(columns, x);
                 
                  x = StructNew();
                  x.varname = "intRoleID";
                  x.title = "RoleId";
                  x.type = TYPES.NUMBER;
                  x.required = false;
                  ArrayAppend(columns, x);
                 
                 
                  this.homeData.columns = columns;
                  this.homeData.webid = this.webid;
                  this.homeData.blnWorkflow = false;
                  this.homeData.blnApproval = false;
                  this.homeData.blnLock = false;
                  this.homeData.blnVersion = false;
                  this.homeData.blnDelete = false;
                  this.homeData.blnPreview = false;
                  this.homeData.blnCategory = false;                  
                  this.homeData.blnScheduling = false;                  
                  this.homeData.blnMeta = true;                  
                  this.homeData.blnResources = false;
                  this.homeData.link = this.link;
                  this.homeData.varID = "intID";
                  return this;
            </cfscript>
      </cffunction>
     
      <cffunction name="getTabs" access="public" returntype="any">
            <cfxml variable="xmlNav">
                  <cfoutput>
                        <item>
                              <item caption="Login Options" id="1"/>
                        </item>
                  </cfoutput>
            </cfxml>
            <cfreturn xmlNav />
      </cffunction>
     
      <cffunction name="getBackEnd" access="public" returntype="string" output="true">
            <cfset this.workflow.verifyColumns(this.homeData)>
            <!--- process the form in the back end and inserted --->
            <cfset this.display.setActionMsg(this.workflow.processForm(this.homeData))>
            <!--- this actually get the record (only 1) and you continually edit the record after the first time --->
            <cfquery name="qryExtranetOptions" datasource="#this.datasource#">
                  SELECT *
                  FROM tblExtranetOptions
                  WHERE intCompanyID = #this.companyID#
            </cfquery>
            <cfif qryExtranetOptions.recordcount>
                  <cfset url.id = qryExtranetOptions.intID>
            </cfif>
            <cfset this.homeData.tabs[1] = StructNew()>
            <cfset this.homeData.tabs[1].caption = 'Default Pages'>
            <cfset this.homeData.tabs[1].columnlist = 'optDefaultPage,optLoggedOutDefaultPage,blnLDAP'>
            <cfset this.homeData.tabs[2] = StructNew()>
            <cfset this.homeData.tabs[2].caption = 'Login'>
            <cfset this.homeData.tabs[2].columnlist = 'txtLoginMessage'>
            <cfset this.homeData.tabs[3] = StructNew()>
            <cfset this.homeData.tabs[3].caption = 'Emailed'>
            <cfset this.homeData.tabs[3].columnlist = 'txtSuccessEmail'>
            <cfset this.homeData.tabs[4] = StructNew()>      `
            <cfset this.homeData.tabs[4].caption = 'Not Emailed'>
            <cfset this.homeData.tabs[4].columnlist = 'txtUnSuccessEmail'>
            <cfset this.homeData.tabs[5] = StructNew()>
            <cfset this.homeData.tabs[5].caption = 'Forgot'>
            <cfset this.homeData.tabs[5].columnlist = 'txtForgotPass'>
           
            <!--- when user clicks save, update all the blnldap settings for this company --->
            <cfif isDefined("form.button") AND FORM.button eq #translate('Save')#>
                  <cfset ldap = 0>
                  <cfif isDefined("form.BLNLDAP") AND FORM.BLNLDAP eq 'on'>
                        <cfset ldap = 1>
                  </cfif>

                  <cfquery name="qryUpdateLdap" datasource="#this.datasource#">
                        UPDATE tblExtranetOptions
                        SET blnLDAP = #ldap#                  
                        WHERE intCompanyID = #this.companyID#
                  </cfquery>
            </cfif>
            <cfreturn this.display.getAddEdit(this.homeData)>
      </cffunction>

      <cffunction name="DisplayLoginForm" access="public" returntype="string" output="false">
                  <cfargument name="txtMessage" type="string" required="yes">
           <cfsavecontent variable="txtOutput">
                  <cfoutput>
                  <div id="test">
                        <form   method="post"  name="form">
                              <b><i>User Name: </i></b><input type="text" name="txtUserName" size="20"><br />
                               <b><i>Password: </i></b><input type="password" name="txtPassword" size="20"><br />
                                          
                               <input type="submit" value="Login >>>" name="Login" >
                        </form>
                        </div>
                  </cfoutput>
            </cfsavecontent>
            <cfreturn txtOutput>
                 
      </cffunction>
     
     
      <cffunction name="getFrontEnd" access="public" returntype="struct" hint="Returns front end display." output="true" >
            <cfset var strFrontEnd = StructNew()>
            <cfset strFrontEnd.title = "">
            <cfset strFrontEnd.body = "">
   
            <cfquery name="qryOptions" datasource="#this.datasource#">
                  SELECT       optDefaultPage, txtLoginMessage, txtForgotPass, txtSuccessEmail, txtUnSuccessEmail,      optLoggedOutDefaultPage
                  FROM       tblExtranetOptions
                  WHERE      intCompanyID = #this.companyId#
            </cfquery>
           
            <cfset loginMsg = qryOptions.txtLoginMessage>
            <cfset strFrontEnd.body = DisplayLoginForm(loginMsg)>
           
           
            <!---check if the user is authenticated--->
         <cfsetting enablecfoutputonly="yes">
            <cfif isDefined ("form.txtUserName") and isDefined ("form.txtPassword")>
                  <cfset admin = createObject('component', 'hb50.ldap').init(this.companyId)>
                         
            <cftry>
                <cfset data = admin.login(FORM.txtUsername, FORM.txtPassword)>
<!---                 <cfset StructAppend(SESSION, data)>--->
                         <cfset SESSION.data=data />
                         
                  <cfcatch type="user">
                 
                        <cfset loginError = true>
                        <cfset loginErrorText = CFCATCH.message>
                        <cfoutput>#loginErrorText#</cfoutput>
                  </cfcatch>
            </cftry>
                  </cfif>
                         
               
            
                  
            <cfif isDefined("session.data") and session.data is true>
                  <cfset xmlNav = this.navigation.getPublicNavXML()>
                        <cfset xmlResult = searchXMLByID(xmlNav, qryOptions.optDefaultPage)>
                        <cfif not isSimpleValue(xmlResult)>
                              <cfset xmlParent = xmlResult[1]>
                              <cfset txtRedirectLink = xmlParent.xmlattributes.url>
                              <cfif xmlParent.xmlattributes.id NEQ this.webid>                                    
                                    <cflocation url="#txtRedirectLink#" addtoken="no">                              
                              </cfif>
                        </cfif>
                  <cfelse>
                  <cfset
                        <cfset xmlNav = this.navigation.getPublicNavXML()>
                        <cfset xmlResult = searchXMLByID(xmlNav, qryOptions.optLoggedOutDefaultPage)>
                        <cfif not isSimpleValue(xmlResult)>
                              <cfset xmlParent = xmlResult[1]>
                              <cfset txtRedirectLink = xmlParent.xmlattributes.url>
                              <cfif xmlParent.xmlattributes.id NEQ this.webid>                                    
                                    <cflocation url="#txtRedirectLink#" addtoken="no">                        
                                    
                              </cfif>
                        </cfif>
                  
            
            </cfif>
                  
                                                                                                                                                                                                                                                                                                      
           
            <cfreturn strFrontEnd />
      </cffunction>
        
        <cffunction name="logout" access="public" returntype="any">
      </cffunction>
        
        
      
     
</cfcomponent>