I have a FormView used to edit records but when the user presses the Button, it also needs to do some back-end stuff in the code-behind. For this I need to pass the ID of the record.
Currently this is my code in the page:
<asp:LinkButton ID="savebtn" runat="server" CausesValidation="True"
CommandName="Update" Text="Save Changes"
OnClick="setProcessProgress" CommandArgument='<%# Eval("id") %>' />
And this is a stripped-down version of my code-behind:
protected void setProcessProgress(object sender, FormViewCommandEventArgs e)
{
if (e.CommandName == "Update")
ID_p = Int32.Parse((string)e.CommandArgument);
}
I'm getting the No overload for 'setProcessProgress' matches delegate 'System.EventHandler'
I tried changing the EventArgs to CommandEventArgs and it didn't work either.
If I use OnCommand instead of OnClick it just doesn't call setProcessProgress. Any ideas?
According to the MSDN Documentation on FormViewCommandEventArgs.
The ItemCommand event is raised when a button within the FormView
control is clicked. This allows you to provide an event-handling
method that performs a custom routine whenever this event occurs.
Buttons within a FormView control can also invoke some of the built-in
functionality of the control. To perform one of these operations, set
the CommandName property of a button to one of the values in the
following table.
The event is not assigned to the Button's OnClick event, it is actually assigned to the FormViews ItemCommand Event
i.e
<asp:FormView ID="FormView1" runat="server"
onitemcommand="setProcessProgress">
<asp:LinkButton ID="savebtn" runat="server" CausesValidation="True"
CommandName="Update" Text="Save Changes"
CommandArgument='<%# Eval("id") %>'
protected void setProcessProgress(object sender, EventArgs e)
{
LinkButton btn = sender as LinkButton;
if (btn.CommandName=="Update")
{
...
Response.Write("Updated");
...
}
}
Maybe you can try EventArgs e in your method.
Related
Inside a RadGrid, I have a drop RadComboBox that is populated by a web service.
I am using an EditItemTemplate nested inside a GridTemplateColumn to hold it, as shown:
On the server side, how can I access the value chosen by the user from the RadComboBox?
<telerik:GridTemplateColumn UniqueName="UserCol" HeaderText="proto user" DataField="UserID">
<EditItemTemplate>
<telerik:RadComboBox ID="RadComboBox1" runat="server" AutoPostBack="false" CausesValidation="true"
Width="240" MaxHeight="200px" OnItemsRequested="ddEmployee_ItemsRequested" AllowCustomText="true"
EnableLoadOnDemand="true" ShowMoreResultsBox="true" EnableVirtualScrolling="true"
MarkFirstMatch="false" >
</telerik:RadComboBox>
</EditItemTemplate>
</telerik:GridTemplateColumn>
It depends on what event you're handling.
You can set AutoPostBack="true" and handle the OnSelectedIndexChanged event of the RadComboBox. This is very straightforward as you can get the selected value either from the EventArgs or from the sender object which is the RadComboBox itself.
Check this out: http://www.telerik.com/help/aspnet-ajax/combobox-server-side-selectedindexchanged.html
If you are handling a row operation event such as insert or update, you need to find the RadComboBox object from the GridItem (e.Item).
protected void RadGrid_RowOperation(object sender, Telerik.Web.UI.GridCommandEventArgs e)
{
// this will find the control
RadComboBox RadComboBox1 = (RadComboBox)(e.Item.FindControl("RadComboBox1"));
// so you can get the selected value
string value = RadComboBox1.SelectedValue;
}
I have two buttons in a ListView. With a click on the first Button I want to update the ListView-Item. With a click on the second button i want to update the ListView-Item and redirect to a different page. Both Buttons have a property CommandName="Update". I wanted to solve my problem with the CommandArgument-Property and the OnItemUpdated-Event, but I do not know how to get the value of this Property in the event.
<asp:ObjectDataSource ID="ods" runat="server" SelectMethod="Select" UpdateMethod="Update">
<SelectParameters>
<asp:Parameter ..... />
</SelectParameters>
<UpdateParameters>
<asp:Parameters .... />
</UpdateParameters>
</asp:ObjectDataSource>
<asp:ListView ID="lv" runat="server" DataSourceID="ods" DataKeyNames="ID" OnItemUpdated="lv_OnItemUpdated">
<ItemTemplate>...</ItemTemplate>
<EditItemTemplate>
<asp:Button ID="btnUpdate" runat="server" CommandName="Update"/>
<asp:Button ID="btnUpdate2" runat="server" CommandName="Update"/>
</EditItemTemplate>
</asp:ListView>
And in codebehind:
protected void lv_OnItemUpdated(object sender, ListViewUpdateEventArgs e)
{
...
}
Is it possible to decide in lv_OnItemUpdated which Button the user clicked?
I don't believe there is a way to distinguish which control issued the Update command, since sender is the ListView itself.
A workaround would be for you to give one button the CommandName "Update", and the other "UpdateRedirect".
The "UpdateRedirect" button will fire the ListView_ItemCommand event, and from there you can call ListView.UpdateItem, keeping your updating logic in there, and then redirect next.
Why do you insist on using the OnItemUpdated event?
Well there are 2 to 3 ways of doing it: One is of CommandArgument as:
<asp:Button id="Button1"
Text="Sort Ascending"
CommandName="Sort"
CommandArgument="Ascending"
OnCommand="CommandBtn_Click"
runat="server"/>
<asp:Button id="Button2"
Text="Sort Descending"
CommandName="Sort"
CommandArgument="Descending"
OnCommand="CommandBtn_Click"
runat="server"/>
and than on server side you can have:
void CommandBtn_Click(Object sender, CommandEventArgs e)
{
if(e.CommandName == "Sort")
//do you work and so on
}
or you can cast the sender as button and take it ID to see, which button was it:
((Button)sender)).ID
or you can get button ID as:
String ButtonID = Request["__EVENTTARGET"];
I hope it will help you in fixing your problem.
so you can have like:
protected void lv_OnItemUpdated(object sender, ListViewUpdateEventArgs e)
{
// either use e.CommandName
// or user ((Button)sender)).ID
}
Give each button a distinct name. Have the same event handling method in your code behind handle both button click events. Then check which button called the method.
EDIT: A workaround would be to use javascript to put the name of the clicked button into a hidden field on the form BEFORE it goes server side (using a client side script). Then in your Listview you could check the value of the hidden field to see which button was clicked.
Ok, yes, the itemcommand is what you want:
The lifecycle for an update or insert triggers both their native events AND the itemcommand event. The itemCommand event will occur prior to the itemUpdating or the itemInserting events.
So, you can create a boolean variable called called "bSecondButtonClicked" for example Add the command argument to both buttons with the Commandname='UPDATE". the e.command argument can be evaluated at the itemcommand event point. There set your Boolean variable (or however you implement it) to true. Then, at the itemupdating event, trigger your code based on the bSecondButtonClicked.
You need to get into the ItemCommand event of your ListView
protected void lstvw_ItemCommand(object sender, ListViewCommandEventArgs e)
{
switch (e.CommandName)
{
case "new":
try
{
//e.CommandArgument
//e.CommandSource
// do your stuff here
}
catch (Exception ex)
{
}
break;
default:
break;
}
}
I have this LinkButton here
<asp:LinkButton runat="server" ID="EditBtn" CssClass="LinkButton" Text="Edit" Width="45px" OnClientClick="Profiles_Edit" CommandName="edit" />
and I am trying to call this function in my code behind
protected void Profiles_Edit(Object sender, ListViewCommandEventArgs e)
{
//do something
}
but when I click on the button....nothing happens. My LinkButton is inside an ItemTemplate, which is inside a ListView, which is inside a ContentTemplate, which is inside a UpdatePanel....
What is wrong with the way I am calling it?
Thanks,
J
OnClientClick is for specifying the name of the JavaScript function on the client browser.
To call the server-side event, use OnClick.
Also, you may not need the CommandName attribute in this situation. It isn't clear where this LinkButton resides. If it's in a container like a ListView, you would handle it differently.
I am bit new to C# and got a question.
I have a class as below that simply return false ( this is just to test)
public class SetAuthority
{
public SetAuthority()
{
//
// TODO: Add constructor logic here
//
}
public static Boolean AuthorizedToAddEdit()
{
return false;
}
}
I have a DetailsView with two link buttons to Edit and add New record. I want to hide the link buttons based on the above class method returning value.
<ItemTemplate>
<asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False" visible='<%# SetAuthority.AuthorizedToAddEdit() %>'
CommandName="Edit" Text="Edit"></asp:LinkButton>
<asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="False" visible='<%# SetAuthority.AuthorizedToAddEdit() %>'
CommandName="New" Text="New"></asp:LinkButton>
</ItemTemplate>
Above works file and Edit and New link buttons are hidden when I run the program.
But the question is, I have a separate link button outside of the DetailsView. It is just a link to navigate to another page. I want to hide this in similar way using the same logic. I have the below code in my webform.
<asp:LinkButton ID="LinkButton5" runat="server" CausesValidation="False" visible='<%# SetAuthority.AuthorizedToAddEdit() %>'
CommandName="OpenAdminPage" Text="Open Admin Page"></asp:LinkButton>
But the link button is always visible and seems it is not calling the class and not getting the value back. It appeared to be the class not return any value and can someone help me to identify what is the different between having this and working in DetailsView and not working for a simple link button.
Note: have a workaround where I can call the same method in Page Load event that works fine without any issue. Code is below
protected void Page_Load(object sender, EventArgs e)
{
Boolean myAllowAdd;
myAllowAdd = SetAuthority.AuthorizedToAddEdit();
if (myAllowAdd == false)
{
LinkButton1.Visible = false;
}
}
The reason is that this is for databinding expressions only: <%# Since the DetailsView is databound it works there.
If you would DataBind the page it worked also for the LinkButton outside of the DetailsView:
protected void Page_Load(object sender, EventArgs e)
{
Page.DataBind();
}
inline asp.net tags... sorting them all out (<%$, <%=, <%, <%#, etc.)
Side-note: be careful with static in ASP.NET. The static method does not yet hurt. But if you'd also use static fields you'd enter a minefield since it would be shared across all requests. Your current code-behind "work-around" is the better approach anyway.
I want load two user controls on demand.
asp:UpdatePanel ID="UpdatePanel1" runat="server"
ContentTemplate
asp:Button ID="Button1" runat="server" Text="Button" UseSubmitBehavior="false"
OnClick="Button1_Click" /
div id='Div_UserControlPlace' enableviewstate="true" runat="server"
/div
/ContentTemplate
Triggers
asp:PostBackTrigger ControlID="Button1" /
/Triggers
/asp:UpdatePanel
asp:UpdatePanel ID="UpdatePanel2" runat="server"
ContentTemplate
asp:Button ID="Button2" runat="server" Text="Button" UseSubmitBehavior="false"
OnClick="Button2_Click" /
div id='Div_UserControlPlace2' enableviewstate="true" runat="server"
/div
/ContentTemplate
aspx.cs
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
Control FeaturedProductUserControl = new Control();
FeaturedProductUserControl = LoadControl("WebUserControl1.ascx");
FeaturedProductUserControl.EnableViewState = true;
Div_UserControlPlace.Controls.Add(FeaturedProductUserControl);
}
protected void Button2_Click(object sender, EventArgs e)
{
Control FeaturedProductUserControl2 = new Control();
FeaturedProductUserControl2 = LoadControl("WebUserControl2.ascx");
FeaturedProductUserControl2.EnableViewState = true;
Div_UserControlPlace2.Controls.Add(FeaturedProductUserControl2);
}
I load the first user control by clicking on the first button - this works properly but when I click on the other button to load the second UserControl, the first UserControl disappears and the second UserControl loads.
Thanks
IFA_User
You should use the Placeholder control to dynamically add your controls to the form.
Take a look at my last responses about dynamic controls:
OnClick event of dynamically created LinkButtons is not working
Dynamically Added DropDownlists Are Not Firing SelectedIndexChanged Event
Dynamically create an ImageButton
Now I already have some code working for demo purpose, each dynamic user controls keeps its state across post backs
This is the output:
ASPX
<asp:PlaceHolder runat="server" ID="addresses" /><br />
<asp:Button Text="Add Address" runat="server" ID="addAddress" OnClick="addAddress_Click" />
ASPX Code behind
protected void Page_PreLoad(object sender, EventArgs e)
{
for (int i = 0; i < this.DynamicControlsCount; i++)
{
var c = this.LoadControl("~/AddressControl.ascx");
this.addresses.Controls.Add(c);
}
}
protected void addAddress_Click(object sender, EventArgs e)
{
this.DynamicControlsCount++;
var c = this.LoadControl("~/AddressControl.ascx");
this.addresses.Controls.Add(c);
}
protected int DynamicControlsCount
{
get
{
if (this.ViewState["ac"] == null)
{
return 0;
}
return (int)this.ViewState["ac"];
}
set
{
this.ViewState["ac"] = value;
}
}
ASCX
<%# Control Language="C#" AutoEventWireup="true" CodeBehind="AddressControl.ascx.cs" Inherits="WebApplication1.AddressControl" %>
<asp:Panel ID="Panel1" runat="server" GroupingText="Address" DefaultButton="btnSave">
Street: <asp:TextBox runat="server" ID="txtStreet" /><br />
City: <asp:TextBox runat="server" ID="txtCity" /><br />
<asp:Button Text="Save" runat="server" ID="btnSave" OnClick="btnSave_Click" />
</asp:Panel>
<asp:Panel runat="server" GroupingText="Address Summary" Visible="false" ID="summary">
<asp:Label ID="lblStreet" runat="server" /><br />
<asp:Label ID="lblCity" runat="server" />
</asp:Panel>
ASCX Code behind
protected void btnSave_Click(object sender, EventArgs e)
{
this.summary.Visible = true;
this.lblCity.Text = "Selected city: " + this.txtCity.Text;
this.lblStreet.Text = "Selected street: " + this.txtStreet.Text;
}
When a user control is created in the HTML, asp.net will persist across postbacks without any user interaction. But if you are loading them programatically (dynamically), they will not persist accross postbacks. So if you load them programmatically, you have the added task of persisting them programmatically as well. Use the ViewState (or Session I suppose) to store what has been loaded and perhaps any other necessary information that needs to be loaded between postbacks. Every single postback will require you to reload every control or else they will disappear.
There are couple of ways of doing it:
U can load the UserControls using Ajax. Benefit of using Ajax, is ur page does not get post back, thus for example, on click event of Button1, call a ajax(traditional/Jquery) to load UserControl1, and on button click of Button2 User control2.
Put the two button in two different updated panel, by doing this the click event will only refresh a part of ur page.
U have to save somewhere (ViewState/Session),which buttons are clicked, and upon clicking of any button check the value of that variable, and explicit load the control.
Points to note - If u want to get ur data back when ur page made a complete postback, then u have to add the controls keeping in mind the Page load event cycle.