ASP.NET AJAX UI

Re: HOWTO: Write controls compatible with UpdatePanel without linking to the ASP.NET AJAX DLL

stock — Thu, 25 Oct 2007 20:46:39 GMT

My ASP.NET Ajax page has a LinkButton under the UpdatePanel. When clicking the link button, another web page test.aspx will pop up in a new window. I used Eilon's ScriptManagerHelper class to register the javascript aiming to open a new window. Here is the event handler when clicking on the link button:

protected void lbutton_Click(object sender, EventArgs e)

{

System.Text.StringBuilder strBuilder = new System.Text.StringBuilder();

{

strBuilder.Append("<script language='javascript'>");

strBuilder.Append("x=0; y=0; if(screen){x=(screen.availWidth - 900)/2; y = (screen.availHeight - 700)/2;}");

strBuilder.Append("window.open('" + "../forms/test.aspx" + "', 'CustomPopUp', ");

strBuilder.Append("'width=900, height=600, left='+x+',top='+y+',screenX='+x+',screenY='+y+',menubar=yes, scrollbars=yes, status=yes, resizable=yes')");

strBuilder.Append("</script>");

}

ScriptManagerHelper.RegisterStartupScript(this, this.GetType(), "PopupScript", strBuilder.ToString(), true);

}

The new window cannot be opened. If just using “window.open();”, it cannot be opened either. Both of them have this error: There is no source code available for the current location. Any comments about this error? Thanks.

Re: HOWTO: Write controls compatible with UpdatePanel without linking to the ASP.NET AJAX DLL

LSU.Net — Mon, 26 Mar 2007 14:15:03 GMT

Alhambraeidos,

Hay dos funcciones que tienen el mismo nombre. Necesita usted usar ese sintactico:

        Type scriptManagerType = Type.GetType("System.Web.UI.ScriptManager, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35", false);
        if (scriptManagerType != null)
        {
            //ScriptManager.RegisterClientScriptResource(Control, Type, string);

            RegisterClientScriptResourceMethod = scriptManagerType.GetMethod("RegisterClientScriptResource", 
                new Type[] { typeof(Control), typeof(Type), typeof(System.String)});
        }

Re: HOWTO: Write controls compatible with UpdatePanel without linking to the ASP.NET AJAX DLL

alhambraeidos — Mon, 26 Mar 2007 12:51:37 GMT

Hello mister,

I'll try your code source in ASP.NET AJAX Release not Beta, and it fails in this line:

RegisterClientScriptResourceMethod = scriptManagerType.GetMethod("RegisterClientScriptResource");

The error is : Ambigous match found.

Any solution about this issue ?

Thanks, mister, regards

Re: HOWTO: Write controls compatible with UpdatePanel without linking to the ASP.NET AJAX DLL

Pluginbaby — Fri, 02 Feb 2007 22:32:04 GMT

Unfortunatly that still do not work for me.

I'm using ASP.NET AJAX RTM.

Is there a new way to detect if AJAX is enable ?

Re: HOWTO: Write controls compatible with UpdatePanel without linking to the ASP.NET AJAX DLL

kilik — Wed, 31 Jan 2007 14:24:39 GMT

Made a slight mistake in the solution. The Type array argument for the GetMethod() call for RegisterStartupScript and RegisterClientScriptBlock will need an array that looks like this:

parms = new Type[] { typeof(Control), typeof(Type), typeof(string), typeof(string), typeof(bool)};

Re: HOWTO: Write controls compatible with UpdatePanel without linking to the ASP.NET AJAX DLL

kilik — Wed, 31 Jan 2007 13:58:03 GMT

FYI - there seems to be an issue with the ScriptManagerHelper running against the release version of ASP.NET AJAX. There are now overloaded versions of RegisterClientScriptResource, RegisterStartupScript, and RegisterStartupScript so you'll need to qualify your calls to Type.GetMethod(). You'll get an 'Ambigous match found' exception if you run the code as is.

To resolve the issue simply set up a Type array...

Type[] parms = new Type[]{typeof(Control), typeof(Type), typeof(string)};

...and then pass that as the second argument to each of the GetMethod() calls.

Hope this helps.

Re: HOWTO: Write controls compatible with UpdatePanel without linking to the ASP.NET AJAX DLL

kilik — Wed, 31 Jan 2007 13:57:12 GMT

ScriptManagerHelper translated to VB.Net

LurkingVariable — Wed, 17 Jan 2007 17:46:25 GMT

Hey All, thanks Eilon, good stuff. Here is my first-draft VB.Net Translation of Eilon's ScriptManagerHelper, including the "filling in" of some areas he probably omitted for brevity (like IsMicrosoftAjaxAvailable and RegisterStartupScript):

Friend Class ScriptManagerHelper
    'from: http://forums.asp.net/thread/1445844.aspx, posted by Eilon, http://weblogs.asp.net/LeftSlipper/ 
    Private Shared ReadOnly ReflectionLock As Object = New Object()
    Private Shared MethodsInitialized As Boolean
    Private Shared RegisterClientScriptResourceMethod As System.Reflection.MethodInfo
    Private Shared RegisterStartupScriptMethod As System.Reflection.MethodInfo
    Private Shared mbIsMicrosoftAjaxAvailable As Boolean = False
    Private Shared Sub InitializeHelper()
        If Not MethodsInitialized Then
            SyncLock (ReflectionLock)
                If Not MethodsInitialized Then
                    'Eilon says we should use this...
                    'Dim scriptManagerType As Type = Type.GetType("Microsoft.Web.UI.ScriptManager, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35", False)
                    'but I found this worked for me...
                    Dim scriptManagerType As Type = Type.GetType("System.Web.UI.ScriptManager, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35", False)
                    If Not scriptManagerType Is Nothing Then
                        mbIsMicrosoftAjaxAvailable = True
                        RegisterClientScriptResourceMethod = scriptManagerType.GetMethod("RegisterClientScriptResource")
                        RegisterStartupScriptMethod = scriptManagerType.GetMethod("RegisterStartupScript")
                    End If
                    MethodsInitialized = True
                End If
            End SyncLock
        End If
    End Sub
    Public Shared Sub RegisterClientScriptResource(ByVal control As Control, ByVal type As Type, ByVal resourceName As String)
        InitializeHelper()
        If Not RegisterClientScriptResourceMethod Is Nothing Then
            RegisterClientScriptResourceMethod.Invoke(Nothing, New Object() {control, type, resourceName})
        Else
            control.Page.ClientScript.RegisterClientScriptResource(type, resourceName)
        End If
    End Sub
    Public Shared Sub RegisterStartupScript(ByVal control As Control, ByVal type As Type, ByVal key As String, ByVal script As String, ByVal addScriptTags As Boolean)
        InitializeHelper()
        If Not RegisterStartupScriptMethod Is Nothing Then
            RegisterStartupScriptMethod.Invoke(Nothing, New Object() {control, type, key, script, addScriptTags})
        Else
            control.Page.ClientScript.RegisterStartupScript(type, key, script, addScriptTags)
        End If
    End Sub
    Public Shared ReadOnly Property IsMicrosoftAjaxAvailable() As Boolean
        Get
            InitializeHelper()
            Return mbIsMicrosoftAjaxAvailable
        End Get
    End Property
End Class

Here's how I use this from my server control code:

    Protected Overrides Sub OnPreRender(ByVal e As System.EventArgs)
        MyBase.OnPreRender(e)
        'ScriptManagerHelper.RegisterClientScriptResource(Me, GetType(MyControl), "MyControl.js") '            
        '// Register initialization            
        ScriptManagerHelper.RegisterStartupScript(Me, GetType(MyControl), ClientID + "_Key", "MyC_ShowGroup('" & SelectedGroup.ToString & "');", True)
        If ScriptManagerHelper.IsMicrosoftAjaxAvailable Then
            ScriptManagerHelper.RegisterStartupScript(Me, GetType(MyControl), ClientID + "_Dispose", "document.getElementById('" + UniqueID + "').dispose = MyC_Dispose;", True)
        End If
    End Sub

Enjoy! -Monty

Re: HOWTO: Write controls compatible with UpdatePanel without linking to the ASP.NET AJAX DLL

chetan.sarode — Wed, 17 Jan 2007 04:41:20 GMT

Nice Article..

thxn for it [:)}

Re: HOWTO: Write controls compatible with UpdatePanel without linking to the ASP.NET AJAX DLL

infinitevs — Mon, 18 Dec 2006 13:34:20 GMT

In the article look under the section "Implementing Dispose". It dynamically adds an expando named "dispose" to the DOM element that points to a JavaScript function. There are two reasons you can't set the expando declaratively: 1. It's not valid XHTML, and 2. The value would be a string literal instead of an actual function.

Thanks so much for clarifying this for me Eilon!!! This has helped me no-end, its great I finally have my head around this expando stuff :) Nonetheless I have a question for you, I was wondering if it were possible to use the "scriptmanager.RegisterExpandoAttribute()" method of the scriptmanager to register the expando instead of typing it directly?

kind regards,

infin.

Re: HOWTO: Write controls compatible with UpdatePanel without linking to the ASP.NET AJAX DLL

cnelson1 — Sat, 16 Dec 2006 05:51:41 GMT

Thanks for the info, Eilon.

Do I need to use the dispose function if I am not using attachevent? In my composite controls, I just use this.xxx.Attributes.Add() to attach my javascript to my controls. If there is some kind of dispose I need to use, can you give an example?

Thanks,

Carl

Re: HOWTO: Write controls compatible with UpdatePanel without linking to the ASP.NET AJAX DLL

yagimay — Tue, 28 Nov 2006 04:37:20 GMT

Thanks for the great post Eilon.

I was trying to clarify your post with ASP.NET AJAX Beta 2.
Instead of MathWidget register its scripts via ScriptManager, I
made it register via Page.ClientScript. I meant to ensure the control
not work on UpdatePanel unless it register its scripts via ScriptManager.

However it seems to work even when the scripts are registered via Page.ClientScript.
Is the post still valid with Beta 2 or has there been any enhancement ?

Here is what I do.

1. Modify MathWidget.cs to register scripts via Page.ClientScript.
------------------------------------------
MathWidget.cs
------------------------------------------
        protected override void OnPreRender(EventArgs e)
        {
            base.OnPreRender(e);
            // Register script library
            Page.ClientScript.RegisterClientScriptResource(
                typeof(MathWidget),
                "MathWizard.MathWidget.js");
            // Register initialization
            Page.ClientScript.RegisterStartupScript(
                typeof(MathWidget),
                ClientID + "_KeyStuff",
                "MathWidget_Initialize('" + ClientID + "');",
                true);
        }

2. (a) Generate WebForm and add UpdatePanel.
   (b) Place MathWidget, Button and Label on UpdatePanel.
    (c) Add following code (Button1.Click returns current time).
------------------------------------------
Default.aspx.cs
------------------------------------------
    protected void Button1_Click(object sender, EventArgs e)
    {
        Label1.Text = DateTime.Now.ToString();
    }

3. Debug WebForm.
   (a) Make sure MathWidget works.
   (b) Click Button. --- Label displays current time.
   (c) MathWidget still works.

Re: HOWTO: Write controls compatible with UpdatePanel without linking to the ASP.NET AJAX DLL

Eilon — Thu, 16 Nov 2006 17:06:58 GMT

Thanks,

Eilon

Re: HOWTO: Write controls compatible with UpdatePanel without linking to the ASP.NET AJAX DLL

infinitevs — Thu, 16 Nov 2006 14:50:56 GMT

Thanks eilon I appreciate the feedback, but can you please give me an example in code of what you mean? By expando do you mean, <element dispose="dispose" /> and if so how does one implement this, a simple example would be greatly appreciated..

thanks in advance,

kind regards,

infin.

Re: HOWTO: Write controls compatible with UpdatePanel without linking to the ASP.NET AJAX DLL

Eilon — Wed, 15 Nov 2006 23:34:14 GMT

The dispose expando is used to detach any resources that your control is using. If you don't implement dispose you could experience problems ranging from memory leaks to JavaScript errors to other broken behavior. The PageRequestManager (the client-side "brains" of UpdatePanel) will scan the DOM inside the UpdatePanel for elements supporting "dispose" functionality and invoke those methods to give them a chance to clean up their resources.

Thanks,

Eilon