CODEWITHSUNDEEP
c#asp.net
Joe
Joe

Reputation: 6416

ASP.Net 3.5 ClientID Issue

I have a simple input element with runat="server". This field is nested in a couple of layers of user controls and I am pulling the ID with a getter but the ID given is not the full generated ID.

//UserControl2.ascx nested inside of UserControl1.ascx
...
<input type="text" runat="server" id="newTextBox" />
...

//UserControl1.ascx.cs nested inside of Page1.aspx
...
public string NewTextBoxId;
protected void UserControl2PlaceHolder_Load(object sender, EventArgs e)
{
    var c = LoadControl("~/Common/Controls/Shared/UserControl2.ascx");
    NewTextBoxId = ((App.Common.Controls.Shared.UserControl2) c).newTextBox.ClientID;
}

The issue is that NewTextBoxId is set to "newTextBox" instead of the fully generated "ct100_ct100_MainContent_etc._newTextBox". The input's ID is rendered properly in the HTML but NewTextBoxId is not set properly. To make matters a bit more odd, the input's ID is rendered as "newTextBox" on my local instance but when I deploy to our staging server, it is rendered as "ct100_ct100..._newTextBox" in the HTML. Any ideas on this?

Upvotes: 0

Views: 324

Answers (1)

Ken Henderson
Ken Henderson

Reputation: 2828

As noted in my comment. The LoadedControl c has to be added to the ControlCollection of the current control prior to calling c.ClientID. Adding to the ControlCollection will cause c to be initialized.

//UserControl2.ascx nested inside of UserControl1.ascx
...
<input type="text" runat="server" id="newTextBox" />
...

//UserControl1.ascx.cs nested inside of Page1.aspx
...
public string NewTextBoxId;
protected void UserControl2PlaceHolder_Load(object sender, EventArgs e) 
{
    var c = LoadControl("~/Common/Controls/Shared/UserControl2.ascx");
    this.Controls.Add(c);
    NewTextBoxId = ((App.Common.Controls.Shared.UserControl2) c).newTextBox.ClientID;
}

Upvotes: 1

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