Hi,
I've been using CascadingDropDowns quite successfully in Atlas but have now hit a problem moving to ASP.NET AJAX.
I get a message saying "Element 'CascadingDropDownProperties' is not a known element. This can occur if there is a compilation error in the web site."
When I compile, I get an error message saying "'AjaxControlToolkit.CascadingDropDown' does not have a public property named 'CascadingDropDownProperties'".
In my VB code, I import the AjaxControlToolkit but I get a message saying "Type 'CascadingDropDownProperies' is not defined" and "'GetTargetProperties' is not a member of 'AjaxControlToolkit.CascadingDropDown'".
It almost seems as though CDD properties have been dropped, but that can't be right - can it?
I guess I must be missing something fundamental. Any ideas? I have pasted by code below and highlighted the offending lines...
-- Search.aspx --
<%@dotnet.itags.org. Page Language="VB" AutoEventWireup="true" CodeFile="Search.aspx.vb" MasterPageFile="~/MasterPage.master" Inherits="Search" Title="TiberPass: Property Search Page" %
<%@dotnet.itags.org. Register
Assembly="AjaxControlToolkit"
Namespace="AjaxControlToolkit"
TagPrefix="AjaxCTK"
%
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<AjaxCTK:CascadingDropDown ID="cdd" runat="server" >
<AjaxCTK:CascadingDropDownProperties
Category="Province"
PromptText="-- Any Province --"
ParentControlID="ddlRegion"
ServiceMethod="GetProvincesForRegion"
ServicePath="ListcountService.asmx"
TargetControlID="ddlProvince" />
<AjaxCTK:CascadingDropDownProperties
Category="Town"
ParentControlID="ddlProvince"
PromptText="-- Any Town --"
ServiceMethod="GetTownsForProvince"
ServicePath="ListcountService.asmx"
TargetControlID="ddlTown" />
<AjaxCTK:CascadingDropDownProperties
TargetControlID="ddlRegion"
Category="Region"
ServicePath="ListcountService.asmx"
ServiceMethod="GetRegions"
PromptText="-- Any Region --" />
</AjaxCTK:CascadingDropDown>
....
-- Search.aspx.vb --
Imports AjaxControlToolkit
Partial Class Search
Inherits SmartSessionPage
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
' Retrieve Atlas Cascading Dropdown settings from session variables
Dim properties AsCascadingDropDownProperties
' Region
properties = cdd.GetTargetProperties(ddlRegion)
If properties IsNot Nothing Then
If RegionID <> Nothing Then
properties.SelectedValue = RegionID
End If
End If
' Province
properties = cdd.GetTargetProperties(ddlProvince)
If properties IsNot Nothing Then
If ProvinceID <> Nothing Then
properties.SelectedValue = ProvinceID
End If
End If
' Town
properties = cdd.GetTargetProperties(ddlTown)
If properties IsNot Nothing Then
If TownID <> Nothing Then
properties.SelectedValue = TownID
End If
End If
End Sub
End Class
-- MasterPage.Master --
<%@dotnet.itags.org. Master Language="VB" %
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"
<script runat="server"
</script
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Tiber Pass</title>
<link rel="stylesheet" type="text/css" href="http://links.10026.com/?link=css/main.css"/>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:contentplaceholder id="ContentPlaceHolder1" runat="server">
</asp:contentplaceholder>
<asp:ScriptManager ID="ScriptManager1" runat="server" enablepartialrendering="true">
</asp:ScriptManager>
</div>
</form>
</body>
</html
-- Web.config --
<?xml version="1.0"?>
<configuration>
<configSections>
<sectionGroup name="microsoft.web" type="Microsoft.Web.Configuration.MicrosoftWebSectionGroup, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
<sectionGroup name="scripting" type="Microsoft.Web.Configuration.ScriptingSectionGroup, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
<sectionGroup name="webServices" type="Microsoft.Web.Configuration.ScriptingWebServicesSectionGroup, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
<section name="jsonSerialization" type="Microsoft.Web.Configuration.ScriptingJsonSerializationSection, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false"/>
<section name="profileService" type="Microsoft.Web.Configuration.ScriptingProfileServiceSection, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false"/>
<section name="authenticationService" type="Microsoft.Web.Configuration.ScriptingAuthenticationServiceSection, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false"/>
</sectionGroup>
</sectionGroup>
</sectionGroup>
</configSections>
<system.web>
<pages>
<controls>
<add tagPrefix="asp" namespace="Microsoft.Web.UI" assembly="Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
<add tagPrefix="asp" namespace="Microsoft.Web.UI.Controls" assembly="Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
<add tagPrefix="asp" namespace="Microsoft.Web.Preview.UI" assembly="Microsoft.Web.Preview"/>
<add tagPrefix="asp" namespace="Microsoft.Web.Preview.UI.Controls" assembly="Microsoft.Web.Preview"/>
</controls>
<tagMapping>
<add tagType="System.Web.UI.WebControls.CompareValidator" mappedTagType="Microsoft.Web.UI.Compatibility.CompareValidator, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
<add tagType="System.Web.UI.WebControls.CustomValidator" mappedTagType="Microsoft.Web.UI.Compatibility.CustomValidator, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
<add tagType="System.Web.UI.WebControls.RangeValidator" mappedTagType="Microsoft.Web.UI.Compatibility.RangeValidator, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
<add tagType="System.Web.UI.WebControls.RegularExpressionValidator" mappedTagType="Microsoft.Web.UI.Compatibility.RegularExpressionValidator, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
<add tagType="System.Web.UI.WebControls.RequiredFieldValidator" mappedTagType="Microsoft.Web.UI.Compatibility.RequiredFieldValidator, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
<add tagType="System.Web.UI.WebControls.ValidationSummary" mappedTagType="Microsoft.Web.UI.Compatibility.ValidationSummary, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
</tagMapping>
</pages>
<!--
Set compilation debug="true" to insert debugging
symbols into the compiled page. Because this
affects performance, set this value to true only
during development.
-->
<compilation debug="false">
<assemblies>
<add assembly="Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
<add assembly="System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/></assemblies>
</compilation>
<httpHandlers>
<remove verb="*" path="*.asmx"/>
<add verb="*" path="*.asmx" validate="false" type="Microsoft.Web.Script.Services.ScriptHandlerFactory, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
<add verb="GET" path="ScriptResource.axd" type="Microsoft.Web.Handlers.ScriptResourceHandler" validate="false"/>
</httpHandlers>
<httpModules>
<add name="WebResourceCompression" type="Microsoft.Web.Handlers.WebResourceCompressionModule, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
<add name="ScriptModule" type="Microsoft.Web.UI.ScriptModule, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
</httpModules>
</system.web>
<microsoft.web>
<scripting>
<webServices>
<!-- Uncomment this line to customize maxJsonLength and add a custom converter -->
<!--
<jsonSerialization maxJsonLength="500">
<converters>
<add name="ConvertMe" type="Acme.SubAcme.ConvertMeTypeConverter"/>
</converters>
</jsonSerialization>
-->
<!-- Uncomment this line to enable the authentication service. Include requireSSL="true" if appropriate. -->
<!--
<authenticationService enabled="true" requireSSL = "true|false"/>
-->
<!-- Uncomment these lines to enable the profile service. To allow profile properties to be retrieved
and modified in ASP.NET AJAX applications, you need to add each property name to the setProperties and
getProperties attributes. -->
<!--
<profileService enabled="true"
readAccessProperties="propertyname1,propertyname2"
writeAccessProperties="propertyname1,propertyname2" />
-->
</webServices>
</scripting>
</microsoft.web>
<system.webServer>
<validation validateIntegratedModeConfiguration="false"/>
<modules>
<add name="ScriptModule" preCondition="integratedMode" type="Microsoft.Web.UI.ScriptModule, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
</modules>
<handlers>
<remove name="WebServiceHandlerFactory-ISAPI-2.0"/>
<add name="ScriptHandlerFactory" verb="*" path="*.asmx" preCondition="integratedMode" type="Microsoft.Web.Script.Services.ScriptHandlerFactory, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
<add verb="GET" path="ScriptResource.axd" type="Microsoft.Web.Handlers.ScriptResourceHandler" validate="false"/>
</handlers>
</system.webServer>
</configuration
Android:
Hi,
I've been using CascadingDropDowns quite successfully in Atlas but have now hit a problem moving to ASP.NET AJAX.
I get a message saying "Element 'CascadingDropDownProperties' is not a known element. This can occur if there is a compilation error in the web site."When I compile, I get an error message saying "'AjaxControlToolkit.CascadingDropDown' does not have a public property named 'CascadingDropDownProperties'".
In my VB code, I import the AjaxControlToolkit but I get a message saying "Type 'CascadingDropDownProperies' is not defined" and "'GetTargetProperties' is not a member of 'AjaxControlToolkit.CascadingDropDown'".
It almost seems as though CDD properties have been dropped, but that can't be right - can it?
The properties have been moved for the new release of ASP.NET AJAX. There's more information in themigration guide for the toolkitand examples of how the new approach works in thesample page for the cascading dropdown control. I hope this helps!
Ah! That explains it. I thought I must have missed something pretty fundamental. Thanks for that.
I've been attempting to convert my code, but come across a problem when I try to use CascadingDropDownProperties and GetTargetProperties. I guess these don't exist any more but what do I use instead? Sorry if this seems basic, but I'm not very technical and am only using VB.NET reluctantly (I kind of hoped Atlas/Ajax would do it all for me, sigh). The examples are in C#.
I'm trying to set my drop down lists based on saved session variables. It was working OK in Atlas, but now I'm struggling. Any ideas? Here are the main parts of my code with the offending bits highlighted:
-- Search.aspx --
<AjaxCTK:CascadingDropDown
ID="cddProvince"
runat="server"
Category="Province"
PromptText="-- Any Province --"
ParentControlID="ddlRegion"
ServiceMethod="GetProvincesForRegion"
ServicePath="ListcountService.asmx"
TargetControlID="ddlProvince"
LoadingText="Loading Provinces..." />
<AjaxCTK:CascadingDropDown
ID="cddTown"
runat="server"
Category="Town"
ParentControlID="ddlProvince"
PromptText="-- Any Town --"
ServiceMethod="GetTownsForProvince"
ServicePath="ListcountService.asmx"
TargetControlID="ddlTown"
LoadingText="Loading Towns..." />
<AjaxCTK:CascadingDropDown
ID="cddRegion"
runat="server"
TargetControlID="ddlRegion"
Category="Region"
ServicePath="ListcountService.asmx"
ServiceMethod="GetRegions"
PromptText="-- Any Region --"
LoadingText="Loading Regions..." /
-- Search.aspx.vb --
Dim properties AsCascadingDropDownProperties
' Region
properties = cddRegion.GetTargetProperties(ddlRegion)
If properties IsNot Nothing Then
If RegionID <> Nothing Then
properties.SelectedValue = RegionID
properties = RegionID
End If
End If
Ah! That explains it. I thought I must have missed something pretty fundamental. Thanks for that.
I've been attempting to convert my code, but come across a problem when I try to use CascadingDropDownProperties and GetTargetProperties. I guess these don't exist any more but what do I use instead? Sorry if this seems basic, but I'm not very technical and am only using VB.NET reluctantly (I kind of hoped Atlas/Ajax would do it all for me, sigh). The examples are in C#.
I'm trying to set my drop down lists based on saved session variables. It was working OK in Atlas, but now I'm struggling. Any ideas? Here are the main parts of my code with the offending bits highlighted:
-- Search.aspx.vb --
Dim properties AsCascadingDropDownProperties' Region
properties = cddRegion.GetTargetProperties(ddlRegion)
If properties IsNot Nothing Then
If RegionID <> Nothing Then
properties.SelectedValue = RegionID
properties = RegionID
End If
End If
I think they changed how you access the individual dropdownlists. You can now directly access them, so if you want to set the selectedValue of the ddlRegion control, do this:
cddRegion.SelectedValue = RegionID
I assume RegionID is stored somewhere in Session. It sounds like you're doing that.
One thing I would watch out for is the order you set the selectedValues for the cascading dropdowns. I haven't used the control yet, but I assume it might have problems if you don't assign a value to the parent dropdownlist, then the one under it, then the one under it, and so on.
Best of luck, let us know how it went!
That's great. It's much easier now.
You're right, I'm storing RegionID, etc. as session variables. The idea is that the drop downs will retain the user selections when they return to this page. I had it working fine before.
Now I have a new problem. For some reason the code I have written in my search page to populate the drop downs is not being executed. I have set up 3 drop downs with 3 associated CDDs. The dropdowns should call service methods like "GetRegions" and "GetProvincesForRegion", etc. within ListCountService.asmx, but it never gets that far. The drop downs come up with a Method Error 500. I've put a breakpoint in GetRegions, but it doesn't get activated. Maybe it's something in my header? Before, I had EnableEventValidation, EnableViewState and AutoEventWireup set to false. Now I just have AutoEventWireup set to true and don't mention the other two.
The code for Search.aspx hasn't changed since my last post and I haven't touched the code in ListCountService.asmx. Besides, no matter how good or bad the code is, it just isn't running!
I really appreciate your help on this.
Andrew
Check out Cranzy's post inthis thread andthis blog post by Shawn Burke. I hope this helps!
Fantastic! That's solved it and it's all working fine now. Thanks very much. I'm pretty sure I wouldn't have spotted that other post or blog entry without a nudge in the right direction.
Thanks again,
Andrew
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