Single Click
The single click button (Figure 1) is used to avoid multiple postbacks to the server. This feature is useful in database and/or e-mail send scenarios when the developer wants to prevent the users from submitting identical content multiple times to the server.
Figure 1: RadToggleButton with SingeClick functionality before and after click.
The following properties should be used to enable the single click functionality:
SingleClick - determines whether the RadToggleButton control will be immediately disabled after the user clicks it. Set it to true to enable the single click functionality.
SingleClickText - determines the text displayed in the RadToggleButton control after the button has been clicked and disabled. The original text will be retrieved after the server request execution. The property takes a plain text string.
Example 1: The code that enables the single click functionality in RadToggleButton from Figure 1.
<asp:TextBox ID="txtName" runat="server" />
<telerik:RadToggleButton runat="server" ID="RadToggleButton1" SingleClick="true" SingleClickText="Processing..." OnToggleStateChanged="RadToggleButton1_ToggleStateChanged">
<ToggleStates>
<telerik:ButtonToggleState Text="State 1">
</telerik:ButtonToggleState>
<telerik:ButtonToggleState Text="Submit" Selected="true">
</telerik:ButtonToggleState>
<telerik:ButtonToggleState Text="State 3">
</telerik:ButtonToggleState>
</ToggleStates>
</telerik:RadToggleButton>
<asp:Label ID="lblGreeting" runat="server" />
protected void RadToggleButton1_ToggleStateChanged(object sender, Telerik.Web.UI.ToggleButtonStateChangedEventArgs e)
{
if (Page.IsPostBack) System.Threading.Thread.Sleep(3000);
lblGreeting.Text = String.Format("Hello, {0}!", txtName.Text);
}
Protected Sub RadToggleButton1_ToggleStateChanged(sender As Object, e As Telerik.Web.UI.ToggleButtonStateChangedEventArgs) Handles RadToggleButton1.ToggleStateChanged
If Page.IsPostBack Then
System.Threading.Thread.Sleep(3000)
End If
lblGreeting.Text = String.Format("Hello, {0}!", txtName.Text)
End Sub
The submitted text is processed on the server side. Note that the method System.Threading.Thread.Sleep is used so that the disabled button can be examined after clicking it.