query regarding the Ajax calendaExtender

Question

Dear Friends i have a query regarding the Ajax calendaExtender... in my form there are two date controls Start Date & End Date....i have use calendar extender on them...as well there is Dropdownlist control named PO Number i have written some code on its SelectedIndex_Change event....my problem is whenever i enter the Date's and select the PO Number from dropdownlist control the date values gets vanished or refreshed.....i also dont want the user to Edit date this so i made the Date's control(Start & End Date) as Read Only How can i get the Date values even if page gets refreshed on SelectedIndex_Change event of Dropdownlist control. Pl reply Aamir Khan

Manish Dwivedi · Answer

Hi  If the target TextBox is set as ReadOnly the value would be empty when post back. you can use a HiddenField to save the selected date value and then assign it to TextBox in client page load event. Please refer this code: @ Page Language=C# AutoEventWireup=false CodeBehind=TestSaveDateAfterPostBack.aspx.vb Inherits=CalendarUserControl.TestSaveDateAfterPostBack %> @ Register Assembly=AjaxControlToolkit Namespace=AjaxControlToolkit TagPrefix=cc1 %> xmlns = http://www.w3.org/1999/xhtml > runat = server > type = text/javascript language = javascript > function pageLoad () { if ( $get ( HiddenField1 ). value !=  ) { $get ( TextBox1 ). value = $get ( HiddenField1 ). value ; } } function clientChanged ( sender  args ) { $get ( HiddenField1 ). value = sender . _selectedDate . format ( sender . _format ); } id = form1 runat = server > ID = ScriptManager1 runat = server /> ID = up1 runat = server > ReadOnlyText: ID = TextBox1 runat = server ReadOnly = true > ID = CE runat = server Enabled = True TargetControlID = TextBox1 PopupButtonID = ImageButton1 Format = MM/dd/yyyy OnClientDateSelectionChanged =  clientChanged  /> ID = ImageButton1 runat = server /> ID = HiddenField1 runat = server /> /> ID = Button1 runat = server Text = PostBack />