How to disable the text entry in ASP.NET Web Forms DropDownCalendar?
You can disable the entry of text by rewriting the existing onkeydown event of DropDownCalendar control Textbox element. And the keys pressed can be validated in this event. Please refer the below code snippet
C#
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
//DropDownCalendar control attributes collections should be set before
''RenderChildren'' method.
CustomDropDownControl DropDownCalendarControl1 = new CustomDropDownControl();
//Add dropdown control in the PlaceHolder control list
PlaceHolder1.Controls.Add(DropDownCalendarControl1);
}
}
public class CustomDropDownControl : DropDownCalendarControl
{
protected override void RenderChildren(HtmlTextWriter writer)
{
//Insert the Validation script here.
this.m_textBox.Attributes["onkeydown"] = "if(!(event.keyCode<=57 && event.keyCode
=48)){if(!(event.keyCode <= 90 && event.keyCode >=65)){if(!(event.keyCode<=122 &&
event.keyCode >=97)){" + this.m_textBox.Attributes["onkeydown"] + "}else return
false;}else return false;}else return false;";
base.RenderChildren(writer);
}
}
VB
Public partial Class _Default : Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
Dim DropDownCalendarControl1 As CustomDropDownControl = New
CustomDropDownControl()
PlaceHolder1.Controls.Add(DropDownCalendarControl1)
End Sub
End Class
Public Class CustomDropDownControl : Inherits DropDownCalendarControl
Protected Overrides Sub RenderChildren(ByVal writer As HtmlTextWriter)
Me.m_textBox.Attributes("onkeydown") = "if(!(event.keyCode<=57 &&
event.keyCode >=48)){if(!(event.keyCode <= 90 && event.keyCode
>=65)){if(!(event.keyCode<=122 && event.keyCode >=97)){" &
Me.m_textBox.Attributes("onkeydown") & "}else return false;}else return false;}else return
false;"
MyBase.RenderChildren(writer)
End Sub
End Class
Note:
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