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How-to > Exclude controls from ajaxifying

Glossary Item Box

By default the AJAX Panel ajaxifies all controls placed inside. If you want to exclude a control from ajaxifying you can use the following approach:

Attributes OnClick and __doPostBack call

  1. Implement the realPostBack function into your aspx/ascx file 
  2. Add a custom OnClick attribute to the control (Button in this case).
    Example Title Copy Code
    <script type="text/javascript">
         function realPostBack(eventTarget, eventArgument)
     {
       __doPostBack(eventTarget, eventArgument);
     }
    </script>

    <    asp:Button ID="Button1" runat="server" Text="Button" />
    <    asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
    <    rad:RadAjaxPanel ID="RadAjaxPanel1" runat="server">
           <asp:LinkButton ID="LinkButton1" runat="server" Text="PostBack"></asp:LinkButton>
           <asp:LinkButton ID="LinkButton2" runat="server" Text="Ajax"></asp:LinkButton>
    </    rad:RadAjaxPanel>
    And in the code-behind (Page_Load event handler):

    C# Copy Code
    if (!Page.IsPostBack)
    {
       LinkButton1.Attributes.Add(     "onclick", string.Format("realPostBack(\"{0}\", \"\"); return false;", LinkButton1.UniqueID));
    }

    VB.NET Copy Code
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If Not Page.IsPostBack Then
            LinkButton1.Attributes.Add( "onclick", String.Format("realPostBack('{0}', ''); return false;", LinkButton1.UniqueID))
        End If
    End Sub

If you do not have a control that registers the __doPostBack function on the page you should add the following line in the Page_Load as well: 
this.Page.ClientScript.GetPostBackEventReference(this, "");

This will come handy when you want a single control to perform post-back for your scenario or you want to upload files from control in AJAX Panel.

 

Set EnableAJAX to false at OnRequestStart for the particular control/request

1. Hook OnRequestStart client event

2. Set args.EnableAJAX = false for the respective initiator

ASPX/ASCX Copy Code
  <script type="text/javascript">
           function RequestStart(sender, args)
           {
               if (args.EventTarget == "Button1")
               {
                   args.EnableAjax = false;
               }
           }
       </script>
       <rad:RadAjaxManager ID="RadAjaxManager1" runat="server">
           <AjaxSettings>
               <rad:AjaxSetting AjaxControlID="Panel1">
                   <UpdatedControls>
                       <rad:AjaxUpdatedControl ControlID="Label1" />
                   </UpdatedControls>
               </rad:AjaxSetting>
           </AjaxSettings>
           <ClientEvents OnRequestStart="RequestStart" />
       </rad:RadAjaxManager>
       <asp:Panel ID="Panel1" runat="server">
           <asp:Button ID="Button2" runat="server" Text="AJAX"/>
           <asp:Button ID="Button1" runat="server" Text="Postback instead of AJAX"/>
       </asp:Panel>
Exclude Dynamically Loaded Controls

In case you are loading the user control dynamically, the code if (!Page.IsPostBack) in the example above  in its Page_Load event handler is never executed. You can check for the attached OnClick event instead of the IsPostBack. For example:

C# Copy Code
protected void Page_Load(object sender, EventArgs e)
{
   bool isOnClickAttached = false;
   IEnumerator keys = this.CheckBox1.Attributes.Keys.GetEnumerator();
   while(keys.MoveNext())
   {
        if(keys.Current.Equals("onClick"))
       {
           isOnClickAttached = true;
           break;
       }
   }
   if(!isOnClickAttached)
       this.CheckBox1.Attributes.Add( "onClick", string.Format("realPostBack(\"{0}\", \"\"); return false;", this.CheckBox1.UniqueID));
}
VB.NET Copy Code
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
 Dim isOnClickAttached As Boolean = false
 Dim keys As IEnumerator = Me.CheckBox1.Attributes.Keys.GetEnumerator

 While keys.MoveNext
  If keys.Current.Equals("onClick") Then
   isOnClickAttached = true
   'TODO: Warning!!! break;If
  End If

 End While
 If Not isOnClickAttached Then
  Me.CheckBox1.Attributes.Add( "onClick", String.Format("realPostBack(\""{0}\"", \""\""); return false;", Me.CheckBox1.UniqueID))
 End If
End Sub

 

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