getting an error javascript:_dopostback('caldate','2285') in popup calendar


I am getting an error for a popup calendar as javascript:_dopostback('caldate','2285') when I try to select date from calendar. The code is in and .aspx.vb file of calendar control contains following code.


Sub Change_Date(ByVal sender As System.Object, ByVal e As System.EventArgs)

Dim strScript As String = "<script>window.opener.document.forms(0)." + control.Value + ".value = '"

strScript += calDate.SelectedDate.ToString("MM/dd/yyyy")

strScript += "';self.close()"

strScript += "</" + "script>"

RegisterClientScriptBlock("anything", strScript)

End Sub.

Will anybody pls tell me why I get this error.


7/20/2006 6:15:22 AM 24353 articles. 1 followers. Follow

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Without knowing the error message and line it involves, its hard to say. Here are a few things that could help:

1. Make sure the <script> tag is <script language='javascript'>.

2. See forms(0)? Switch to forms[0]. Its the official javascript syntax. While IE doesn't mind the parenthesis for an array, all other browsers don't handle it.

3. A common errors users make is that when an ID is used in the client-side, they use the same value as the ID property of the server side control. You should always use the ClientID property on the server side control. I don't see this in your scripts and while the doPostback has an ID ('caldate'), its generated by the calendar code, so its correct.

4. There is a good article on writing this kind of popup calendar:

I first used that article too, but since then, I learned that the popup calendar into a separate window design had some really frustrating problems:
1. Popup blockers could stop it.
2. The window doesn't float. So the user can accidentally click on another window and send the calendar behind the browser window.
3. Difficult to size it properly because browsers calculate the size of a table differently and the number of weeks changes between 4 and 6 rows.
4. Difficult to position near the toggle button.

So, like many people, I rewote the whole thing, abandoning the Microsoft Calendar control for one of my own that uses javascript to update (no post backs). This allows me to popup the calendar in the same window using absolutely positioned <DIV> tags. If you are trying to build a good UI on your site, consider using a third party DateTextBox with popup calendar. There are a lot since ASP.NET has been around for so long. Mine is Peter's Date Package. Others can be found at this site's Control Gallery,, and In fact, you will find a rich variety of controls with many good ideas and field tested for ASP.NET at these sites.

--- Peter Blum
Creator of Peter's Data Entry Suite (formerly Professional Validation And More and Peter's Date Package) and Peter's Polling Package
7/20/2006 5:32:35 PM

replace line -

RegisterClientScriptBlock("anything", strScript)


If (Not IsStartupScriptRegistered("clientScript")) Then

Page.RegisterStartupScript("clientScript", strscript)

End If

bye it will work

from -india

12/27/2007 10:48:20 AM

harminder singh,

Why are you answering a post that is over a year and a half old? Also your code does absolutely nothing different than the original poster's did.



12/27/2007 1:14:34 PM

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