Manually Add an AJAX Request
Usually HTML elements have more client-side events than their server-side counterparts. For example, the asp:TextBox control implements only the TextChanged server-side event while the corresponding HTML element has a few more: OnMouseOver , OnMouseOut , OnKeyPress , OnKeyUp ,OnKeyDown , etc. If you want to AJAX-enable one of these client events you have to follow the instructions bellow:
Method I (Add the Attribute Declaratively)
- Add the OnKeyUp attribute and make it call a custom function:
<asp:TextBox onkeyup="TextBoxCustomAjax('TextBox1');" ID="TextBox1" runat="server">
</asp:TextBox>
- Implement the TextBoxCustomAjax function:
function TextBoxCustomAjax(eventArgs) {
$find("<%= RadAjaxManager1.ClientID %>").ajaxRequest(eventArgs);
}
- a. Implement the AjaxRequest server event of the RadAjaxManager :
protected void RadAjaxManager1_AjaxRequest(object sender, AjaxRequestEventArgs e)
{
if (e.Argument == TextBox1.ClientID)
{
Label1.Text = TextBox1.Text;
}
}
Protected Sub RadAjaxManager1_AjaxRequest(ByVal sender As Object, ByVal e As AjaxRequestEventArgs)
If e.Argument = TextBox1.ClientID Then
Label1.Text = TextBox1.Text
End If
End Sub
- b. In the designer, set RadAjaxManager1 to update Label1 .
Method II (Add the Attribute from Code-behind).
- Add the OnKeyUp attribute:
protected void Page_Load(object sender, EventArgs e)
{
TextBox1.Attributes.Add("onkeyup", RadAjaxManager1.GetAjaxRequestReference(TextBox1.ClientID));
}
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
TextBox1.Attributes.Add("onkeyup", RadAjaxManager1.GetAjaxRequestReference(TextBox1.ClientID))
End Sub
- Implement the AjaxRequest event of the RadAjaxManager :
protected void RadAjaxManager1_AjaxRequest(object sender, AjaxRequestEventArgs e)
{
if (e.Argument == TextBox1.ClientID)
{
Label1.Text = TextBox1.Text;
}
}
Protected Sub RadAjaxManager1_AjaxRequest(ByVal sender As Object, ByVal e As AjaxRequestEventArgs)
If e.Argument = TextBox1.ClientID Then
Label1.Text = TextBox1.Text
End If
End Sub
3.Set from the design-time configuration wizard that RadAjaxManager1 will update Label1 .
