Trigger problem

Hello, I have an custom control with an event, Something like this

Partial

Class CustomControl_SearchInherits System.Web.UI.UserControl

End Class

Therein i have declared an event:

PublicEvent SelectedIndexChanged(ByVal senderAsObject,ByVal eAs System.EventArgs)

and in the html i have created an Listbox

<ASP:ListboxSelectionMode="Multiple"ID="_Listbox"runat="server"AutoPostBack="true"Height="100%"Width="400px"/>

then on the event Listbox.selectedIndexChanged i raise the event SelectedIndexChanged.

ProtectedSub Listbox_SelectedIndexChanged(ByVal senderAsObject,ByVal eAs System.EventArgs)Handles _Listbox.SelectedIndexChanged RaiseEvent SelectedIndexChanged(sender, e)EndSubNow when i try to hook up a selectedIndex event (from my custom control) on the TRIGGER property from the update panel, it wont work, Why not?, It doesnt even apear in the event property's of my custom control

Could you specify the control composition?

I mean , whether the update panel holds an instance of your CustomControl_Search, or the ListBox itself.

If it is the first case, it is quite natural that the update panel cannot be triggered by the SelectedIndex event of the list box.

Probably you could paste some more code here ?

Yani

Ok. Here is some more code:

This is the definition of the custom control

<%@.ControlLanguage="VB"AutoEventWireup="false"CodeFile="Search.ascx.vb"Inherits="CustomControl_Search"%>

<tablewidth="100%"height="100%"cellspacing="0"cellpadding="0"border="0"id="TableNav">

<trheight="12px">

<tdrowspan="4"style="width: 400px"class="IL">

<ASP:ListboxSelectionMode="Multiple"ID="_Listbox"runat="server"

Height="100%"Width="400px"/></td>

</tr>

</table>

ProtectedSub Listbox_SelectedIndexChanged(ByVal senderAsObject,ByVal eAs System.EventArgs)Handles _Listbox.SelectedIndexChanged

RaiseEvent SelectedIndexChanged(sender, e)

EndSub

PartialClass CustomControl_Search

Inherits System.Web.UI.UserControl

' declare events

PublicEvent SelectedIndexChanged(ByVal senderAsObject,ByVal eAs system.EventArgs)

PublicEvent Find_Clicked()

' handle event (in customcontrol)

ProtectedSub Listbox_SelectedIndexChanged(ByVal senderAsObject,ByVal eAs System.EventArgs)Handles _Listbox.SelectedIndexChanged

RaiseEvent SelectedIndexChanged(sender, e)

EndSub

EndClass

Then I use this custom contol in an aspx page, with 4 update panels, witch have a trigger on the SelectedIndexChanged event raised by Searchpnl

<tdcolspan="3"><uc4:SearchID="Searchpnl"runat="server/></td>

<cc1:UpdatePanelID="UpdatePanel1"runat="server"RenderMode="Inline">

<ContentTemplate>

-- Content --

</ContentTemplate>

<Triggers><cc1:ControlEventTriggerControlID="Searchpnl"EventName="SelectedIndexChanged"/></Triggers>

</cc1:UpdatePanel>

But I the whole page is updated, and I won't only the update panel to be updated. (that's where its for).

I can't see the SelectedIndexChanged event in the property's. I can't see it in the task pane from the updatepanel either.

Thanks in advance

If you want to get only the update panel updated, you need to put your search control into the update panel.

Other wise it wouldn't know whether to make a regular page post back or an ajax one.

If it does not work try registering your search control in the script manager

ScriptManager1.RegisterAsyncPostBackControl(Searchpnl);

Cheers,

Yani

While we work closely with the ASP.NET AJAX team when developing the Toolkit, they're the real experts on general ASP.NET AJAX issues. Your problem doesn't seem to be directly related to the Toolkit, so we'd appreciate if you considered posting to one of theother newsgroups such asAJAX Discussion and Suggestions. Your post will be more helpful to others looking for similar advice if it's in the right place. Thank you!

hi,

how can an activex control　trigger an event of the parent form's control?

for example, I have an activex control which is a button that when clicked, it will output the content of a textbox.

Public Function setText(txt As String)
msg = txt
End Function

Private Sub Button_login_Click()
MsgBox msg

End Sub

After the msgbox is displayed, I want to clear the text in the textbox located in the parent form.

Any idea?

thanks!

Sheila

trying to deserialize json to a C# class - do I use .Deserialize? .Deserialize<>?

Hello,

I have several classes that have been rendered to the client, each with their respective __Type properties. I have created a generic save() webmethod that I would like to invoke, passing any of the various serialized classes. But each attempt fails with various runtime errors. My original intent was:

[WebMethod]
public string save(object obj)
{
obj.save() // obj is casted to one of several c# classes depending upon the __Type property present
}

And I hoped/assumed that .NET Ajax would handle my deserializtion which it did not. My next attempt was to make the obj variable a string type and then try and deserialize manually inside the method. I have done this quite easily in the past with AjaxPro.

[WebMethod]
public string save(string obj)
{
System.Web.Script.Serialization.JavaScriptSerializer jser = new System.Web.Script.Serialization.JavaScriptSerializer()
myobj = (cs_class)jser.Deserialize<cs_class>(obj);

myobj.save();
obj.save() // obj is casted to one of several c# classes depending upon the __Type property present
}

I am now looking at System.Web.Script.Serialization.JavascriptSerializer.Deserialize<> and System.Web.Script.Serialization.JavascriptSerializer.DeserializeObject() but the documentation is sparse and there is no sample code and I'm not even sure I'm looking at the right thing.

Could anybody help me with this please?

Troy

In the case below, ASP.NET Ajax would deserialize the object to right type.

[WebMethod]
public string save(object obj)
{
obj.save() // obj is casted to one of several c# classes depending upon the __Type property present
}

However this only happens for the types that corrospond to type proxy that is generated (This way server side has control over what types can instantiated during deserialization). Please include [GenerateScriptType(typeof(YourType))] to your service class, for all the possible types that can be passed to 'save' webmethod.

In the case below, ASP.NET Ajax would deserialize the object to right type.

[WebMethod]
public string save(object obj)
{
obj.save() // obj is casted to one of several c# classes depending upon the __Type property present
}

However this only happens for the types that corrospond to type proxy that is generated (This way server side has control over what types can instantiated during deserialization). Please include [GenerateScriptType(typeof(YourType))] to your service class, for all the possible types that can be passed to 'save' webmethod.

Ankit,Thanks for your answer. However, I am still unsure where to continue from here. Obj is type object, a builtin C# type that I am using as a placeholder since I don't know what I am going to receive from the client. I can't call obj.save directly since it will try and call a save() method on the builtin object type (that doesn't exist). How do I coerce obj into thinking it is one of my allowable types? Moreover, the type that was actually received?

Also, I have added the [GenerateScriptType... decoration but I don't think it was needed. My classes were already successfully serialized to the client. When I inspect the DOM I can see all of my allowable classes and when I inspect the contents of the XHR post I see the full json text including __Type:

Troy

Sorry I somewhat misread your question ( I thought you said deserialization is not being handled properly by ASP.NET Ajax). Yes if the type is already referenced by your service class then you don't need the GenerateScriptType decoration.

Once you get Obj of type Object, you can call Obj.GetType() to get the type of the object. Based on the type you would need to cast to the type , and then call .save(). If you have control over the definations for all the types that you need to call .save() on , a better thing would be to define an interface with .save() method, and have all the types implement that interface.

Ankit, thank you so much. You've answered my first and most fundamental question which is "can it be done?" I understand conceptually what you are saying but I'm unsure how to actually implement it. I have control over all the interfaces. I have created an abstract class called Asset and then derived Bookmark and Collection from it. Both Bookmark and Collection override the abstract save() method. If you have the time would you be able to offer some sample code?

Thanks,

Troy

In a related question how can I go about ensuring the __Type property is present?

One of my webmethods is called getTemplate()

 [WebMethod] [ScriptMethod(UseHttpGet =true, ResponseFormat = ResponseFormat.Json)] [PrincipalPermission(SecurityAction.Demand, Role ="Users")]public adbeast.myadbeast.collection getTemplate() {return new adbeast.myadbeast.collection(); }

and it returns

{"__type":"adbeast.myadbeast.collection","collectionType":0,"id":0,"parentId":null,"title":"","description":"","urlIcon":"","ace":0,"assetsUpdated":false,"usernameCreated":"","usernameModified":"","dateCreated":"\/Date(-62135578800000)\/","dateUpdated":"\/Date(-62135578800000)\/","assetIds":{"BOOKMARK":[],"IMAGE":[],"NEWSSUBSCRIPTION":[],"SPOT":[]},"assetType":1}

I have another webmethod

  
 [WebMethod] [ScriptMethod(UseHttpGet =true, ResponseFormat = ResponseFormat.Json)] [PrincipalPermission(SecurityAction.Demand, Role ="Users")]public List getAssets(Int64[] arrAssetIds) {return adbeast.myadbeast.user.getAssets(currentUser.userName.ToString(), arrAssetIds); }

 that returns

 [{"collectionType":0,"id":72,"parentId":0,"title":"My Collection","description":"","urlIcon":"/thumbnails/","ace":31,"assetsUpdated":false,"usernameCreated":"troyf","usernameModified":"troyf","dateCreated":"\/Date(1179432532950)\/","dateUpdated":"\/Date(1179432577013)\/","assetIds":{"BOOKMARK":[92,93,94,95,96,70,71,70],"IMAGE":[],"NEWSSUBSCRIPTION":[],"SPOT":[]},"assetType":1}]  

I am not receiving the __Type property in the second example. Should I be writing a custom Converter for my classes? I am looking at http://ajax.asp.net/docs/mref/T_System_Web_Script_Serialization_JavaScriptSerializer.aspx and the examples but there is no indication that __Type is created if I build a custom converter.

Troy

Are both these methods in the same web service?

They are in separate webservices.

T.

Try adding [GenerateScriptType(typeof(adbeast.myadbeast.collection))] to the service class in second case. __type is only added for types that are for parameter types , return types for webmethods, and types in GenerateScriptType decorations.