This post originated from an RSS feed registered with .NET Buzz by Daniel Zeiß. Original Post: ComfortASP.NET - selective update & client text change event Feed Title: Daniel's Blog Feed URL: /error.aspx?aspxerrorpath=/danielz/Rss.aspx Feed Description: ComfortASP.NET - AJAX for all Latest .NET Buzz Posts Latest .NET Buzz Posts by Daniel Zeiß Latest Posts From Daniel's Blog

Maybe you are interested in some upcoming features of ComfortASP.NET.

Still going for the goal of pure server side programming, the next version of ComfortASP.NET comes with new Controls that provide some still missing features.

The first Control is called "PanelUpdater" and is used for a so called selective update. You can drop the PanelUpdater into a Panel and ComfortASP.NET will update only this certain Panel - if triggered to do so. This makes it possible to update only parts of the Page and keep UI free of updates you do not need or want.

The second Control is called "ClientEventTextChange" and is used to transport a Text Change event from client to server. Provided with the ID of the TextBox of which you want to get the events on the server it monitors text changes and fires a server side event in a case of any changes.

I implemented this new Example Page to demonstrate the new features.
The demo shows a Google search with Suggest features.

Below you can see the designer window of the Visual Studio Project:

Here is the Source Code - as you can see it's all pure Server Side code:
(ComfortASP.NET is integrated via HttpHandler)

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using ComfortASP;
using testComfortASP.Google;

namespace testComfortASP
{
 public class SelectiveUpdate : Page
 {
  protected ComfortASP_ClientEventTextChange ComfortASP_ClientEventTextChange1;
  protected Label Label1;
  protected ComfortASP_PanelUpdater ComfortASP_PanelUpdater1;
  protected ComfortASP_Manager ComfortASP_Manager1;
  protected Label LabelSearch;
  protected TextBox TextBoxSearchPhrase;
  protected System.Web.UI.WebControls.Panel PanelGoogleResult;
  protected System.Web.UI.WebControls.Panel Panel1;
  protected System.Web.UI.WebControls.LinkButton LinkButtonClearResults;
  protected System.Web.UI.WebControls.Button ButtonUpdate;
  protected System.Web.UI.WebControls.Panel Panel2;
  protected System.Web.UI.WebControls.Panel Panel3;
  protected Label LabelGoogleResults;
 
  override protected void OnInit(EventArgs e)
  {
   InitializeComponent();
   base.OnInit(e);
  }
  
  private void InitializeComponent()
  {   
   this.LinkButtonClearResults.Click += new System.EventHandler(this.LinkButtonClearResults_Click);
   this.ButtonUpdate.Click += new System.EventHandler(this.ButtonUpdate_Click);

   // Event Handler for new ComfortASP_ClientEventTextChange Control
   this.ComfortASP_ClientEventTextChange1.TextChanged +=
    new ComfortASP.ComfortASP_ClientEventTextChange.TextChangedHandler(
     this.ComfortASP_ClientEventTextChange1_TextChanged);
  }

  private void ComfortASP_ClientEventTextChange1_TextChanged(object sender, EventArgs e)
  {
   DoGoogleSearch();
  }

  private void ButtonUpdate_Click(object sender, System.EventArgs e)
  {
   DoGoogleSearch();
  }

  private void LinkButtonClearResults_Click(object sender, System.EventArgs e )
  {
   TextBoxSearchPhrase.Text = "";
   LabelGoogleResults.Text = "";
  }

  private void DoGoogleSearch()
  {
   string l_SearchPhrase = TextBoxSearchPhrase.Text;

   // Do search with at least 3 characters
   if( l_SearchPhrase.Length >= 3 )
   {
    try
    {
     LabelSearch.Text = ""+l_SearchPhrase+"";

     GoogleSearchService l_GoogleSearchService = new GoogleSearchService();

     GoogleSearchResult l_Result = l_GoogleSearchService.doGoogleSearch(
      "{my google key}",
      l_SearchPhrase, 0, 5, true, "", false, "", "", "");

     string l_Return = string.Empty;

     if( l_Result.resultElements.Length > 0 )
     {
      for (int i = 0; i < l_Result.resultElements.Length; i++)
      {
       l_Return += "<a href='" + l_Result.resultElements[i].URL+ "'>" + l_Result.resultElements[i].title + "</a><br>";
      }
      LabelGoogleResults.Text = l_Return;
      return;
     }
    } catch( Exception ) { }

    LabelGoogleResults.Text = "No Results found or Google search is not possible at the moment, please try again later!";
   }
  }
 }
}