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Atlas: ModalUpdateProgress - An UpdateProgress Control in Modal Popup Style

, 26 Jun 2007
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A progress indicator control that works in a modal popup style.

Sample Image - ModalUpdateProgress.jpg

Introduction

ASP.NET AJAX has a cool UpdateProgress control that provides a visual indicator while one or more of the UpdatePanel controls are being updated. However, it will be much more useful if all other elements on the page could be disabled when the UpdateProgress is shown. This led me to build the ModalUpdateProgress control in which the UpdateProgress will act as a modal popup.

How UpdateProgress Control Works

If you open up System.Web.Extensions.dll using reflector, you will be able to look up how UpdateProgress control works. Simply put, it implements IScriptControl's two methods GetScriptDescriptors() and GetScriptReferences(). According to the AJAX documentation, GetScriptDescriptors() returns a list of components, behaviors, and client controls required for the UpdateProgress control's client functionality; and GetScriptReferences() returns a list of client script library dependencies for the UpdateProgress control. In GetScriptDescriptors(), the UpdateProgress control registers a ScriptControlDescriptor with type name Sys.UI._UpdateProgress, which is a class available in MicrosoftAjaxWebForms.js (MicrosoftAjaxWebForms.js is one of the ASP.NET AJAX client script libraries, embedded in the System.Web.Extensions.dll). It is pretty straightforward to understand the logic in Sys.UI._UpdateProgress by looking into the debug version of MicrosoftAjaxWebForms.js.

Building the ModalUpdateProgress Control

First, we derive ModalUpdateProgress from UpdateProgress so that we can reuse its existing properties and interface. Then we need to override the two methods GetScriptDescriptors() and GetScriptReferences(), and implement the client-side script component. We will name the client script component as Sys.UI._ModalUpdateProgress, which in turn will be a sub class of Sys.UI._UpdateProgress.

The following is the detail implementation of GetScriptDescriptors() and GetScriptReferences():

/// <span class="code-SummaryComment"><summary>
</span>
/// Gets the script descriptors.
/// <span class="code-SummaryComment"></summary>
</span>
/// <span class="code-SummaryComment"><returns>A list of components, behaviors, and 
</span>
/// client controls required
/// for the ModalUpdateProgress control's client functionality
/// <span class="code-SummaryComment"></returns>
</span>
protected override IEnumerable<ScriptDescriptor> GetScriptDescriptors()
{
  if (((this.Page != null) && this.ScriptManager
      .SupportsPartialRendering) && this.Visible)
  {
    ScriptControlDescriptor desc = new ScriptControlDescriptor(
       "Sys.UI._ModalUpdateProgress", this.ClientID);
    string updatePanelClientID = null;
    if (!string.IsNullOrEmpty(this.AssociatedUpdatePanelID))
    {
        UpdatePanel panel = this.NamingContainer.FindControl(this
            .AssociatedUpdatePanelID) as UpdatePanel;
        if (panel == null)
        {
            panel = this.Page.FindControl(this
               .AssociatedUpdatePanelID) as UpdatePanel;
        }

        if (panel == null)
        {
            throw new InvalidOperationException(string.Format(
                CultureInfo.InvariantCulture, "No UpdatePanel 
                found for AssociatedUpdatePanelID '{0}'.",
                new object[] { this.AssociatedUpdatePanelID }));
        }

        updatePanelClientID = panel.ClientID;
    }

    string backgroundCssClass = null;
    string cancelControlID = null;
    if (!string.IsNullOrEmpty(this._backgroundCssClass))
    {
        backgroundCssClass = this._backgroundCssClass;
    }

    if (!string.IsNullOrEmpty(this._cancelControlID))
    {
        cancelControlID = this._cancelControlID;
    }

    desc.AddProperty("associatedUpdatePanelId", updatePanelClientID);
    desc.AddProperty("dynamicLayout", this.DynamicLayout);
    desc.AddProperty("displayAfter", this.DisplayAfter);
    desc.AddProperty("backgroundCssClass", backgroundCssClass);
    desc.AddProperty("cancelControlID", cancelControlID);
    yield return desc;
  }
}

/// <span class="code-SummaryComment"><summary>
</span>
/// Gets the script references.
/// <span class="code-SummaryComment"></summary>
</span>
/// <span class="code-SummaryComment"><returns>A list of client script library dependencies for the control.
</span>
/// <span class="code-SummaryComment"></returns>
</span>
protected override IEnumerable<ScriptReference> GetScriptReferences()
{
    yield return new ScriptReference("AjaxControls.ModalUpdateProgress.js", "
    AjaxControls");
}

Both methods return IEnumerable's that will be later handled by ScriptManager.

To implement the client-side script component Sys.UI._ModalUpdateProgress, we can borrow scripts from the ModalPopup control available in the AJAX Control Toolkit. In order to get the script to work for the control, I have to make some minor tweakings, which won't be discussed here. For those who are interested, please look into the ModalUpdateProgress.js in the source for detailed implementation.

How to Use

Just like the UpdateProgress control, you can use the ProgressTemplate property to customize your progress indicator in ModalUpdateProgress.

The ModalUpdateProgress control has an extra property BackgroundCssClass which is used to set the CSS class for the background when the control is displayed. In addition, the ProgressTemplate can include a button that the user can click on to cancel the update in progress. In order for the cancel button to work, you should specify the CancelControlID property using the button ID in the ProgressTemplate.

The following shows an example of adding the ModalUpdateProgress to the page:

<asp:ModalUpdateProgress ID="ModalUpdateProgress1" DisplayAfter="0"
        runat="server" BackgroundCssClass="modalBackground">
 <ProgressTemplate>
  <div class="modalPopup">
     Loading <img src="indicator.gif" align="middle" />
  </div>
 </ProgressTemplate>
</asp:ModalUpdateProgress>

To see how it works, please check out the demo website I have included in the download. The ModalUpdateProgress control supports all the features that UpdateProgress has, including associating the ModalUpdateProgress with an UpdatePanel.

The control passed testing under IE6/7 and Firefox 2.0. Please leave your comments here if you find any problems.

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

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About the Author

Ting Huang

United States United States
Currently playing Wii...Just love it!

Comments and Discussions

 
QuestionMedium Trust Environment Pinmemberdarenh25-Jan-12 0:12 
QuestionAbout the code PinmemberAli Al Omairi(Abu AlHassan)18-Jun-11 22:47 
GeneralMy vote of 5 Pinmemberoctavio reyes15-Jun-11 5:56 
GeneralMy vote of 4 Pinmembersuren.info25-May-11 21:15 
GeneralMy vote of 5 Pinmemberdpjn31623-Sep-10 5:40 
GeneralNo DocType No Progress Modal [SOLVED] PinmemberRamkrishna Barot16-Sep-10 8:32 
GeneralError Sys.ArgumentUndefinedException PinmemberFedericko23-Jul-10 2:06 
GeneralModalupdateprogress not working Pinmemberprakk8827-Jan-10 1:21 
GeneralKB927917 With ModalUpdateProgress PinmemberDanila Korablin21-Jan-10 0:14 
General"Back" button navigation not working with ModalUpdateProgress Pinmemberim1dermike13-Nov-09 10:58 
GeneralLicense Pinmembercrashytje30-Jul-09 22:43 
GeneralHandler was not added sys.ui.domevent.addhandler getting this issue. PinmemberMember 350147124-Jun-09 1:24 
Questionother elements on the page NOT disabled when the ModalUpdateProgress is shown Pinmemberaparna guggilla7-Apr-09 19:49 
QuestionIs there any way to use it for all the requests made to server. PinmemberSaurabh Agrawall3-Apr-09 2:28 
QuestionDelay in Grayed out the background PinmemberM-o-h-a-n8-Feb-09 20:18 
GeneralGreat [modified] Pinmembermuencfra11-Nov-08 6:01 
GeneralRe: Great PinmemberMember 37380457-Dec-08 23:58 
QuestionNeed other form of display too... PinmemberSEKH it29-Oct-08 6:31 
QuestionDynamic message display? Pinmemberconraba20-Oct-08 6:56 
GeneralModalUpdateProgress problem using custom control Pinmembergigi746-Oct-08 22:48 
QuestionAssembly does not allow partially trusted callers Pinmembershalan9924-Sep-08 4:31 
Hi,
 
was wondering if anyone incurred this problem. The application im developing is to be hosted on a medium trust environment. Im developing in VS2005 on vista, so I changed my local trust settings to medium, and got the Security Exception error.
 
I see that the assembly is signed with an snk, but why am I still getting this error? Should I add the APTCA attribute to the "ModalUpdateProgress.cs" class? and if so, how?
 
Much thanx
AnswerRe: Assembly does not allow partially trusted callers PinmemberMember 43434843-Jun-09 19:31 
GeneralRe: Assembly does not allow partially trusted callers Pinmemberlogicaldna15-Jun-09 22:06 
QuestionWhich ajax library are you using here? Pinmemberefinkelb25-Jul-08 6:41 
GeneralModalpopup does not display..... PinmemberKamalmostofi2-Jul-08 3:07 

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