[英]Creating an asyncpostback from a control inside a repeater
I have a repeater whose ItemTemplate contains a PlaceHolder that I add input controls (ListBox, TextBox, CalendarExtender etc.) to on ItemDataBound: 我有一个转发器,该转发器的ItemTemplate包含一个PlaceHolder,我将输入控件(ListBox,TextBox,CalendarExtender等)添加到ItemDataBound上:
<asp:UpdatePanel ID="ReportParameterUpdatePanel" UpdateMode="Conditional" runat="server">
<ContentTemplate>
<asp:Repeater ID="ReportParameterEditRepeater" OnItemDataBound="ReportParameterEditRepeater_ItemDataBound" runat="server">
<ItemTemplate>
<asp:PlaceHolder runat="server" ID="ParameterEntryPlaceholder"></asp:PlaceHolder>
</ItemTemplate>
</asp:Repeater>
</ContentTemplate>
</asp:UpdatePanel>
How can I generate an asyncpostback from one of these TextBoxes inside the repeater (on TextChanged)? 如何从中继器中的这些TextBox之一(在TextChanged上)生成asyncpostback?
The control is created dynamically and I only want to create the postback under certain conditions, so it needs to be done from code behind. 该控件是动态创建的,我只想在特定条件下创建回发,因此需要从后面的代码中完成。
I have tried: 我努力了:
In ReportParameterEditRepeater_ItemDataBound you will need to assign a unique ID to each control, and then bind the text changed event. 在ReportParameterEditRepeater_ItemDataBound中,您需要为每个控件分配一个唯一的ID,然后绑定文本更改事件。 I then like to store those in session.
然后,我想将它们存储在会话中。 Then add it to your placeholder.
然后将其添加到您的占位符。 Below is how I did it in my site for a button click event:
以下是我在网站上针对按钮点击事件的操作方式:
TemplateControls_Headline ctrl = (TemplateControls_Headline)LoadControl("~/Controls/TemplateHeadline.ascx");
ctrl.ID = "MyCtrl_" + CMSSession.Current.AddedTemplateControls.Count;
ctrl.Remove.Click += new EventHandler(RemoveItem_OnClick);
MySession.Current.AddedTemplateControls.Add((Control)ctrl);
PlaceHolder ph = accAddTemplates.FindControl("phAddTemplateControlsArea") as PlaceHolder;
ph.Controls.Add(ctrl);
Then, in your OnInit of the page, you have to re-bind everything from the viewstate since you are creating them dynamically, this is where the unique id you created comes in (this is mainly for postbacks): 然后,在页面的OnInit中,由于要动态创建它们,因此必须重新绑定viewstate的所有内容,这是您创建的唯一ID出现的位置(主要用于回发):
protected override void OnInit(EventArgs e)
{
PlaceHolder ph = accAddTemplates.FindControl("phAddTemplateControlsArea") as PlaceHolder;
int counter = 0;
foreach (UserControl ctrl in MySession.Current.AddedTemplateControls)
{
ctrl.ID = "MyCtrl_" + counter;
ctrl.Remove.CommandArgument = counter.ToString();
ctrl.Remove.Click += new EventHandler(RemoveItem_OnClick);
counter++;
ph.Controls.Add(ctrl);
}
base.OnInit(e);
}
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