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 | Julio34 | | Asp.Net User |
| Using click event with datalist | 1/18/2007 9:30:15 AM |
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Hi, I'm trying to do a web application where an icon list is needed, something like the ListView in C#. I use datalist with it, displaying the text with a label, but, unlike C#, the label has no click event implemented. I need to display a context menu or, at least, get the label's text selected. Can someone help me to do that?
thanks!!! |
| Julio34 | | Asp.Net User |
| Re: Using click event with datalist | 1/18/2007 2:50:47 PM |
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Hi,
No, it doesn't. I create the DataList, ItemTemplate and all the structure from code-behind. However, the topic has changed a little because I switched the Label for the LinkButton, the display is the same and linkbutton does have onclick event implemented.
My problem now is when I click the button inside the DataList, instead of firing the event, everything disappears :S. Any ideas? |
| bstinson | | Asp.Net User |
| Re: Using click event with datalist | 1/18/2007 3:44:44 PM |
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Sounds like the datalist is not being re-bound in the code for your click event.
Brett Stinson [email protected] |
| Hope4sun | | Asp.Net User |
| Re: Using click event with datalist | 1/18/2007 3:45:15 PM |
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Ah yes, thats the good old event bubbling in the datalist control, the DataList control supports the following five events:
? ItemCommand
? UpdateCommand
? EditCommand
? DeleteCommand
? CancelCommand
When
a child control is created in the control, the type of event
to be raised in the containing control can be indicated by using the
CommandName property.
Les say for example, you want to raise an UpdateCommand event, you would specify the CommandName property like this:
<asp:LinkButton Text="Update this data!" CommandName="update" Runat="Server" /> this would call the update routine you had defined, i hope this sorts the problem out for you 
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| Julio34 | | Asp.Net User |
| Re: Using click event with datalist | 1/18/2007 4:36:13 PM |
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public class WebForm1 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.DataList DataList1;
protected System.Web.UI.WebControls.LinkButton lb;
override protected void OnInit(EventArgs e)
{
InitializeComponent();
ConectarBBDD();
base.OnInit(e);
}
private void InitializeComponent()
{
this.DataList1.UpdateCommand +=new DataListCommandEventHandler(DataList1_UpdateCommand);
}
private void DataList1_UpdateCommand(object source, DataListCommandEventArgs e)
{
//code to run when the event is fired
}
private void FillDataSet()
{
//Code to fill DataSet
}
private void FillDatalistDisp(DataSet ds)
{
DataList1.ItemTemplate = new DatalistLabelColumn();
DataList1.DataSource = ds.Tables[ "VEND"].DefaultView;
DataList1.DataBind();
}
}
//This class creates the ItemTemplate at runtime
public class DatalistButtonColumn : ITemplate
{
protected LinkButton lb;
public void InstantiateIn(Control container)
{
LinkButton lb = new LinkButton();
lb.CommandName = "DataList1_UpdateCommand";
lb.DataBinding += new EventHandler(this.BindButtonColumn);
container.Controls.Add(lb);
}
private void BindButtonColumn(object sender, EventArgs e)
{
LinkButton lbl = (LinkButton)sender;
DataListItem container = (DataListItem)lbl.NamingContainer ;
String strVals =Convert.ToString(DataBinder.Eval(((DataListItem)container).DataItem, "vend"));
lbl.Text = strVals;
}
} |
| Julio34 | | Asp.Net User |
| Re: Using click event with datalist | 1/18/2007 4:40:07 PM |
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It doesn't work, there's something obviously wrong there. Could you please help me, I posted the code above. (I misclicked enter, sorry) |
| Julio34 | | Asp.Net User |
| Re: Using click event with datalist | 1/18/2007 4:46:27 PM |
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Sorry, I messed that up, I'll repost it again better I hope
public class WebForm1 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.DataList DataList1; protected System.Web.UI.WebControls.LinkButton lb;
private void LlenarDatalistVend(DataSet ds)
{
DataList1.ItemTemplate = new DatalistButtonColumn("vnsdes");
DataList1.DataSource = ds.Tables["VEND"].DefaultView;
DataList1.DataBind();
}
#region C?digo generado por el Dise?ador de Web Forms
override protected void OnInit(EventArgs e)
{
InitializeComponent();
ConectarBBDD();
base.OnInit(e);
}
private void InitializeComponent()
{
this.DataList1.UpdateCommand +=new DataListCommandEventHandler(DataList1_UpdateCommand);
}private
void DataList1_UpdateCommand(object source, DataListCommandEventArgs e){ //Event code } #endregion } public class DatalistButtonColumn : ITemplate
{
string sCamp = "";
protected LinkButton lb;
public void InstantiateIn(Control container)
{
LinkButton lb = new LinkButton();
lb.CommandName = "DataList1_UpdateCommand";
lb.DataBinding += new EventHandler(this.BindLabelColumn);
container.Controls.Add(lb);
}
private void BindLabelColumn(object sender, EventArgs e)
{
LinkButton lbl = (LinkButton)sender;
DataListItem container = (DataListItem)lbl.NamingContainer ;
String strVals =Convert.ToString(DataBinder.Eval(((DataListItem)container).DataItem, sCamp));
lbl.Text = strVals;
}
}
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| Hope4sun | | Asp.Net User |
| Re: Using click event with datalist | 1/18/2007 6:40:36 PM |
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I've recreated some of your code and sorted out your issue on my machine at lease All i've done in the end is to make sure that the controls are added to the datalist during the page_init, also lb.CommandName needs to be lb.CommandName = "Update"; <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default8.aspx.cs" Inherits="Default8" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:TestConnectionString %>" SelectCommand="SELECT * FROM [Contacts]"></asp:SqlDataSource>
<asp:DataList ID="DataList1" runat="server" DataKeyField="ID" DataSourceID="SqlDataSource1" OnUpdateCommand="DataList1_UpdateCommand">
<ItemTemplate>
</ItemTemplate>
</asp:DataList>
</div>
</form>
</body>
</html>
public partial class Default8 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
//DataList1.DataSource = SqlDataSource1();
}
protected void Page_Init()
{
DataList1.ItemTemplate = new DatalistButtonColumn();
}
protected void DataList1_UpdateCommand(object source, DataListCommandEventArgs e)
{
LinkButton txt = (LinkButton)e.CommandSource;
Response.Write(txt.Text);
}
public class DatalistButtonColumn : ITemplate
{
protected LinkButton lb;
public void InstantiateIn(Control container)
{
LinkButton lb = new LinkButton();
lb.CommandName = "Update";
lb.DataBinding += new EventHandler(this.BindButtonColumn);
container.Controls.Add(lb);
}
private void BindButtonColumn(object sender, EventArgs e)
{
LinkButton lbl = (LinkButton)sender;
DataListItem container = (DataListItem)lbl.NamingContainer;
String strvals = Convert.ToString(DataBinder.Eval(((DataListItem)container).DataItem, "id"));
lbl.Text = strvals;
}
}
}
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| Julio34 | | Asp.Net User |
| Re: Using click event with datalist | 1/19/2007 10:58:49 AM |
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It works!! yeah, the problem was that the controls we're not initialized on the page_init, but don't you have problems with postback if the controls are loaded at the begining?
thx for the answers!!! |
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