VS 2008 - Databinding Dependant Dropdpwns In Formview?
Jan 5, 2010I am trying to do dependent dropdown in a formview. I am getting this error when I select the DDL1. I ma using VS2008 and with code behind in VB.
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GetCase will return a DataTable with just 1 row.Then on my aspx:
<asp:FormView DefaultMode="ReadOnly" runat="server" ID="FormView1" DataKeyNames="complaint_ID">
<ItemTemplate>
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</ItemTemplate>
</asp:FormView>
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[code]....
However, once the update is finished (and I call e.Cancel = true), the LoginView control does not databind its children... so they are all blank. The FormView's viewstate is still fine, as all the rest of the controls outside of the LoginView appear fine. I even handle the FormView_DataBound event and a Trace shows that the FormView is being databound on postback.
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[code]....
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<formview>
<edititemtemplate>
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<customGrid DataField="addresses">
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This is where I'm at.
[Code]....
[Code]....
So, I need to be able to bind the DS.InsertParameters.Add("PageTitle", ---) with the txPageTitle control in the Insert Template, same with the PageURL to txPageURL. Is there any easy way to do this from the code behind? I can't seem to find a way to add a parameter without needing to assign it a value.
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</ItemTemplate>
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[Code]....
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}
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[Code]....
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[code]....
Behind the scenes the control emits a RegularExpressionValidator based on the RefControl.ValidationFormat property.
This works fine, however the problem is that this architecture only allows us to validate with regexes. Now I need to add date format validation, based on the user's preferences (which aren't dependent on their UICulture).
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[code]....
Works okay on first page load, but on subsequent postbacks the validation doesn't work. I think the issue is that the data binding expression doesn't evaluate at all, but I'm not sure I understand why. I'm calling Page.DataBind() in Page_Init whether Page.IsPostBack or not, so shouldn't this work?
If you see I'm barking up the wrong tree, any alternative solutions to the same problem are also welcome.
EDIT
Managed to solve this problem. The issue was with the way ASP.NET page life cycle invokes the user control's events before the page's own events. The control values were being initialized before the data binding on the page could happen.
Because I still need to do the control initialization before Page_Load to subscribe the controls to viewstate, I simply moved the initialization logic to the Page.InitComplete event so the call to Page.DataBind() could get called first.
protected void Page_Init(object sender, EventArgs e)
{
Page.InitComplete += new EventHandler(Page_InitComplete);
}
So the event tree becomes
User Control Page_Init => Hook InitComplete handler
Page (aspx) Page_Init => Bind data
User Control Page_InitComplete => Initialize the control
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Dec 12, 2010In MainPage.aspx I have
<asp:HyperLink runat="server" NavigateUrl='<%#"http://google.pl"%>'>test</asp:HyperLink>
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When I do:
<asp:HyperLink runat="server" NavigateUrl='http://google.pl'>test</asp:HyperLink>
It works fine.
Why <%#"http://google.pl"%> does not work ?
How to debug it ?