I have created a ModalPopupExtender that contains 3 CascadingDropDownLists. The dropdowns work and are populated normally if I don't try and set a value. If I try and set a value for the first dropdown I get an ArgumentOutOfRangeException error. It seems like the value is trying to be set before the dropdown is populated. Does anyone know how I can fix this?
Thanks.
Nevermind. I got it.
Still trying to get these dropdowns to work. I have created a page with a single ddl that should be populated from the web service and has no parents but I still get the [method error 500] as the values, what am I mising here?
ddl.aspx
<%@dotnet.itags.org. Page Language="VB" AutoEventWireup="false" %>
<%@dotnet.itags.org. Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<%@dotnet.itags.org. Register Assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
Namespace="System.Web.UI" TagPrefix="asp" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager id="ScriptManager1" runat="server" EnablePartialRendering="true" >
</asp:ScriptManager>
<asp:DropDownList ID="Region" runat="server" >
</asp:DropDownList>
<cc1:CascadingDropDown
Category="Region"
Enabled="true"
PromptText="Please work..."
ID="CascadingDropDown2"
TargetControlID="Region"
ServiceMethod="GetCountries"
ServicePath="CountriesByRegion.asmx"
runat="server">
</cc1:CascadingDropDown>
</form>
</body>
</html>
CountriesByRegion.asmx
Imports System.Web
Imports System.Web.Services
Imports System.Web.Services.Protocols
Imports PFCEnergy.Refining.Country.Business
Imports System.Data
Imports AjaxControlToolkit
<WebService(Namespace:="http://tempuri.org/")> _
<WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _
<System.Web.Script.Services.ScriptService()> _
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Public Class CountriesByRegion
Inherits System.Web.Services.WebService
<WebMethod()> _
Public Shared Function GetCountries(ByVal knownCategoryValues As String, ByVal category As String) As CascadingDropDownNameValue()
Dim values As New _
System.Collections.Generic.List( _
Of AjaxControlToolkit.CascadingDropDownNameValue)
values.Add(New CascadingDropDownNameValue("foo", "bar"))
values.Add(New CascadingDropDownNameValue("bar", "foo"))
Return values.ToArray
End Function
End Class
Hi,
I too get the same error . Have you sorted the problem ?
Pls help if its working for u .
Thanks.
Yeah got it working, I added the bold and removed the struck through. Good luck.
Imports System.Web
Imports System.Web.Services
Imports System.Web.Services.Protocols
Imports System.Collections.Generic
Imports System.Data
Imports AjaxControlToolkit
<WebService(Namespace:="http://tempuri.org/")> _
<WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _
<System.Web.Script.Services.ScriptService()> _
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Public Class CountriesByRegion
Inherits System.Web.Services.WebService
<WebMethod()> _
PublicShared Function GetCountries(ByVal knownCategoryValues As String, ByVal category As String) As CascadingDropDownNameValue()
Dim values As New _
System.Collections.Generic.List( _
Of AjaxControlToolkit.CascadingDropDownNameValue)
values.Add(New CascadingDropDownNameValue("foo", "bar"))
values.Add(New CascadingDropDownNameValue("bar", "foo"))
Return values.ToArray
End Function
End Class
Hi,
Iam not using list as u did in web method, So i thinkImports System.Collections.Generic is not needed.
Then i am not using Static (C#) in function.
So what would be wrong in my case?
Thanks.
Hi everyone, I had the same problem and after a little tweaking it works!
Here is the tip:
Please make that the database datatype matches the .NET datatype.If you have a different datatype in your database, you should TYPE CAST it to the corresponding .NET type.
string make = (string)dr["Make"];
int makeId = (int)dr["MakeID"];
.NET Framework Type
ADO.NET Database Type
SQL Data Type
String
Varchar
Varchar()
String
Nvarchar
Nvarchar()
String
NChar
Nchar()
String
NText
NText
String
Text
Text
Double
BigInt
Float
DateTime
DateTime
Datetime
DateTime
SmallDateTime
Smalldatetime
Int
Int
Int
Int64
BigInt
Bigint
Int16
SmallInt
smallint
Byte[]
Binary
Binary()
Byte[]
Image
Image
Byte[]
VarBinary
Varbinary()
Byte
TinyInt
Tinyint
Bool
Bit
Bit
Decimal
Decimal
Decimal
Decimal
Money
Money
Decimal
SmallMoney
SmallMoney
Float
Float
Float
Guid
UniqueIdentifier
Uniqueidentifier
Real
Real
Real
I have created a custom control that contains 3 CascadingDropDown boxes.
I would like to have the control fire a custom event when each of the "TextChanged" or "SelectedIndexChanged" events from the Drop Down items change.
I have added the appropriate "events" into my code behind, but they do not seem to fire. Does the JavaScript intercept them?
Any help would be greatly appreciated.
Thanks,
Bryan
Mr. Anson,
Perhaps you could point me in a better direction for my needs.
The Custom Control that I have created consists of 3 CascadingDropDowns that allow the user to select a Location, Skill, and Supervisor (basically this is like the Make/Model/Color sample for the car.).
My control works fine when I incorporate a button to run a report on a different page. My Button_OnClick event can see what values are in my control, and it will send them to the new page.
I would like to incorporate my current control on a page to help narrow down yet another Drop Down List.
In the CDD example, after the user selects the Make/Model/Color, I would like to pull a list of Vehicles by Year to select.
How would I go about hooking up a new CDD that requires the control to have filled in the Make/Model/Color before it can go out and find it's data?
I thought that I could do something like placing the control and drop down list inside an update panel, but I am a little fuzzy on how to continue from there.
Would I need to set up an Atlas Trigger?
Any help that you can provide would be greatly appreciated. It would even help if you could point me in a better direction.
Thanks, Bryan
If my Make/Model/Color are in a seperate control, how will I be able to give my Year CDD the parent that is inside the control? Can I just expose the CDD as a public member?
I don't want to add the Year CDD into my control. A different page may want to populate a different CDD from the data that the control provides.
I have a page where the cascadingdropdown is selecting the wrong item in the list on postback. I can verify that the JavaScript created by the AJAX controls says to select item "5::Description Here" yet item 4 gets selected when the page loads after post back. So you select the parent value, then the child, then click a button that does a postback (in this case a search) and when the two drop downs load the first one is selected correctly and the 2nd one, the cascading drop down, has selected the item above the correct item. If I continue to submit the form over and over the selected item just keeps moving up one spot. I attemted to remove any appended items, in my case one that says "-- Select --", as well as the prompttext as it appears to be an "index" issue, but that didn't solve the problem. I have the exact same dropdown fields on another form where they work just fine on postback. I don't want to post the whole page but here are the dropdowns in question. OfficeLocation is the parent and RateSchedule is the child.
<asp:DropDownListID="drpOfficeLocation"runat="server"AppendDataBoundItems="True"DataSourceID="srcOfficeLocations"DataTextField="Value"DataValueField="ID"Width="150px"EnableViewState="True">
<asp:ListItemValue="">-- Select --</asp:ListItem>
</asp:DropDownList>
<asp:DropDownListID="drpRateSchedule"runat="server"AppendDataBoundItems="True"
DataTextField="Value"DataValueField="ID"EnableViewState="False">
</asp:DropDownList>
<cc1:cascadingdropdownid="ccRates"runat="server"category="Location"loadingtext="Loading Rates..."parentcontrolid="drpOfficeLocation"
servicemethod="GetRateResults"servicepath="JobAJAX.asmx"targetcontrolid="drpRateSchedule"></cc1:cascadingdropdown>
You simply won't believe what I found to be the problem. My controls are in a table that has style="display:none;" and you click an image to show the table. Removing this "display:none" from the table allowed the JS to select the correct item in the dropdown. I added it back and it selected the wrong one again. I can't make any sense of this but that's the problem.
Hi,
I've created a new project following the video found here :http://www.asp.net/learn/ajax-videos/video-77.aspx
My code is the same as in the demo, but when I run the website, I have the "method error 500" in each dropdownlist instead of the makes, models and colors...
Does anyone know what this error code means ?
Thanks for your help.
Hi Dpin,
10.5 Server Error 5xx
Response status codes beginning with the digit "5" indicate cases in which the server is aware that it has erred or is incapable of performing the request. Except when responding to a HEAD request, the server should include an entity containing an explanation of the error situation, and whether it is a temporary or permanent condition. User agents should display any included entity to the user. These response codes are applicable to any request method.
10.5.1 500 Internal Server Error
The server encountered an unexpected condition which prevented it from fulfilling the request.
To resovle the kind of problem, we suggest that you should first check whether your WebService works fine or not. Then check the Control settings. If all these are ok, but your application doesn't work properly. Please add break points to your WebService and debug it step-by-step. Here is theuseful information. Please pay special attention to my last reply.
I hope this help.
Best regards,
Jonathan
Greetings,
I am a relative newcomer to ASP.Net AJAX. So hopefully the answer to this question will be quick and easy.
I've created a CascadingDropDown list that gets store locations based on the company. In some of these datasets there are as many as 6,000 - 10,000 records that need to be loaded into the TargetControl. This ends up being quite a lot of data. I was having problems with this origanally because of the default maxJsonLength in my webconfig which I've now corrected.
The TargetControl now gets loaded and it works with this one exception: For queries with exceptionally large datasets the client is taking up to 30 seconds or more to load the target control. I did caching on the server side in the webservice to cache data sets and that doesn't seem to be the problem. I've done some analysis with Fiddler v2.0 and it appears that the round trip request/response is taking only about a 5th of a second (see capture below):
Request Count: 1
Bytes Sent: 545
Bytes Received: 701,964
ACTUAL PERFORMANCE
-----
Requests started at: 13:58:38:1621
Responses completed at: 13:58:38:3496
Total Sequence time: 00:00:00.1875024
RESPONSE CODES
-----
HTTP/200: 1
RESPONSE BYTES (by Content-Type)
-----
~headers: 239
application/json: 701,725
So the question is: why does it take the CascadeDropDown control so long to load the data? What is client doing for the other 29.8124976 seconds?
When I did this web app in ASP.Net 2.0 (without AJAX), it was taking 2- 3 seconds max for these large data sets to load doing direct databasecalls.
Any help would be appreciated.
Thanks,
Scott Lance
Application Developer
Children's Miracle Network
I have the same problem in my application. Large sets of data are not uncommon in the large applications.
Can anybody, please, take a look at this
I have a dropdownlist created within a repeater that should cascade from another dropdownlist that is also generated within the repeater.
The problem that arises from this situation is when I go to set the CascadingDropDownProperties, I get this error:
Exception Details:System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
An unhandled exception was generated during the execution of thecurrent web request. Information regarding the origin and location ofthe exception can be identified using the exception stack trace below.[NullReferenceException: Object reference not set to an instance of an object.]
AtlasControlToolkit.CascadingDropDown.OnPreRender(EventArgs e) in d:\Depot\Atlas\agility\AtlasControls\MAIN\Src\ControlLibrary\CascadingDropDown\CascadingDropDownExtender.cs:60
System.Web.UI.Control.PreRenderRecursiveInternal() +77
System.Web.UI.Control.PreRenderRecursiveInternal() +161
System.Web.UI.Control.PreRenderRecursiveInternal() +161
System.Web.UI.Control.PreRenderRecursiveInternal() +161
System.Web.UI.Control.PreRenderRecursiveInternal() +161
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1360
cddpNew.TargetControlID = DropDownListControl.ClientID
Has anyone gotten a Cascading drop down to work within a repeater?Since that didn't work I decided to take another approach, which is to put the CascadingDropDown inside the repeater. This had it's own problem.
When trying to get the control from within the repeater during the function that handles the databinding event for the repeater I get the error:
Value of type 'System.Web.UI.Control cannot be converted to 'AtlasControlToolkit.CascadingDropDownProperties'.
