Change GridView Custom Button Text and Css on click event - css

I am working on a project where I am creating a dashboard for the Admin.
I have a UsersGridView which displays the data of the registered users in it.
Using the Template field for the Gridview I have created a button for that allows the Admin to with Lockout or Enable the user's to use the system.
<asp:TemplateField HeaderText="LockoutStatus">
<ItemTemplate>
<asp:Button ID="LockoutStatus" runat="server" CausesValidation="false" CommandName="LockoutStatus" Text="Enabled"
CommandArgument='<%# Eval("Id") %>' />
</ItemTemplate>
</asp:TemplateField>
In the RowCommand event how can I change the button CssClass and text if the user is locked out from the system.

There are several ways you can change the CssClass.
With the RowDataBound event.
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
//check if the row is d datarow
if (e.Row.RowType == DataControlRowType.DataRow)
{
//cast the row back to a datarowview
DataRowView row = e.Row.DataItem as DataRowView;
//use findcontrol to locate the butotn
Button btn = e.Row.FindControl("LockoutStatus") as Button;
//change the class based on a column value
if (row["ColumnName"].ToString() == "LockedOut")
{
btn.CssClass = "ClassA";
}
}
}
Or on the aspx page with a ternary operator.
<asp:Button ID="LockoutStatus" runat="server"
CssClass='<%# Eval("ColumnName").ToString() == "LockedOut" ? "ClassA" : "ClassB" %>'
Or as you wanted in the RowCommand event. You can use the CommandSource and cast it to a Button.
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
Button btn = e.CommandSource as Button;
btn.CssClass = "ClassA";
}

Related

set button visibility in code behind aspx.net

How can I set in my button_Click event, visibility of button in gridView to false?
All the time it give me an error:Compilation Error
Compiler Error Message: CS0103: The name 'btnTest' does not exist in the current context
<asp:GridView ID="GridView1" runat="server" OnRowDataBound="GridView2_RowDataBound">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Button ID="Button189" OnClick="Button189_Click" runat="server" Text="odzemi svez vrganj" />
<asp:Button ID="btnTest" runat="server" CommandName="odzemi" CssClass="button2" OnClick="btnTest_Click" Text="-" Width="100px" Font-Bold="True" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Following is my button event from where i want to hide button inside gridview.
protected void Button10_Click(object sender, EventArgs e)
{
btnTest.Visible = true;
Button189.Visible = false;
}
Use following code to set button visible property to True or False . The Button in gridview which will be clicked will act as sender. Doing so will give you the row id where the button is fired from and then you can find other controls and set your desired property on that particular row.
protected void Button189_Click(object sender, EventArgs e)
{
Button Btn = sender as Button;
GridViewRow gvRow = Btn.NamingContainer as GridViewRow;
int rowId = gvRow.RowIndex;
Button Button189 = GridView2.Rows[rowId].FindControl("Button189") as Button;
Button btnTest = GridView2.Rows[rowId].FindControl("btnTest") as Button;
Button189.Visible = false;
btnTest.Visible = true;
}
You need to loop through the gridview rows and find the control
foreach (GridViewRow row in grid.Rows)
{
if(row.RowType == DataControlRowType.DataRow)
{
var control = ((Button)row.FindControl("btnTest"));
if (control != NULL)
{
((Button)control).Visible = false;
}
}
}

Linkbutton click in a asp:GridView cell does not trigger OnRowCommand event

UI Feature: I have a GridView with few columns. Most important column is PcCode, which shows a string value for each row.
Expected: When I click on one of the cell from a row of that PcCode column another GridView should be displayed. However, when I am trying to use a asp:LinkButton for a cell, things just don't work. RowCommand does not get triggered when I click on a asp:LinkButton in the GridView cell. Where am I doing things wrong? Which way the expected functionality can be achieved? Thanks in advance for helping out a newbie.
In the following code I was trying to get a RowIndex and pass it through the CommandArgument and use a CommandName.
.aspx code
<asp:GridView ID="_UIProfitcenterTotalGridView" runat="server" CellPadding="4" ForeColor="#333333" GridLines="None" AllowPaging="True" PageSize="22" ShowFooter="True" AutoGenerateColumns="False"
DataKeyNames="ProfitcenterCode" EnableViewState="False"
OnRowDataBound="_UIProfitcenterTotalGridView_RowDataBound"
OnPageIndexChanging="_UIProfitcenterTotalGridView_PageIndexChanging"
OnRowCommand="_UIProfitcenterTotalGridView_OnRowCommand">
<Columns>
<asp:TemplateField HeaderText="PcCode" InsertVisible="False"
ShowHeader="False" SortExpression="ProfitcenterCode" FooterText="Total" FooterStyle-HorizontalAlign="Left">
<ItemTemplate>
<asp:LinkButton ID="_UIPCCodeLinkButton" runat="server" Text='<%# Eval("ProfitcenterCode") %>'
CommandName="Select"
CommandArgument='<%# ((GridViewRow) Container).RowIndex %>'>
</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
...
code behind for aspx.cs
protected void _UIProfitcenterTotalGridView_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "Select")
{
int index = Convert.ToInt32(e.CommandArgument);
GridViewRow row = _UIProfitcenterTotalGridView.Rows[index];
string ProfitcenterCode = _UIProfitcenterTotalGridView.DataKeys[_UIProfitcenterTotalGridView.SelectedIndex].Values["ProfitcenterCode"].ToString();
}
}
After the row is selected I need to take the selected row's value as a string and compare with a listitem to show a new GridView.
Tried
Using Link_Button_Click(Object sender, EventArgs e) and the following but failed.
protected void _UIProfitcenterTotalGridView_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "Select")
{string ProfitcenterCode = ((GridViewRow)(((LinkButton)e.CommandSource).NamingContainer)).Cells[2].Text;
}
}
I tried to use LinkButton_Click() event instead of RowCommand as jason suggested:
protected void LinkButton_Click(Object sender, EventArgs e)
{
LinkButton button = (LinkButton)sender;
GridViewRow row = (GridViewRow)button.NamingContainer;
if (row != null)
{
string theValue = ((LinkButton)sender).CommandArgument.ToString();
...
...
//code for the extra thing I needed to do after selecting a cell value.
}
}
However I still had the problem, which I figured out. The problem was the LinkButton was not binding to the rows thefore, it could not pass any value on selection. What was missing was the following code:
if (e.Row.RowType == DataControlRowType.DataRow)
{
LinkButton linkButton = new LinkButton();
linkButton.Text = e.Row.Cells[0].Text; //value of the first column from the grid
linkButton.Enabled = true;
linkButton.Click += new EventHandler(LinkButton_Click); //triggering the LinkButton event here.
e.Row.Cells[0].Controls.Add(linkButton);
}
You can use the sender object ( the link button that calls the event) and get the parent row from the gridview. Example:
Protected Sub linkButton_click(ByVal sender As Object, ByVal e As EventArgs)
'First cast the sender to a link button
Dim btn As LinkButton = CType(sender, LinkButton)
'now, if there is a command arguement, you can get that like this
Dim id As String = btn.CommandArgument
'to get the gridviewrow that the button is on:
Dim row As GridViewRow = CType(btn.NamingContainer, GridViewRow)
End Sub
It was hard to follow exactly what you were looking for, so if i missed something let me know and I will add it.
protected void linkButton_click(object sender, EventArgs e)
{
//First cast the sender to a link button
LinkButton btn = (LinkButton)sender;
//now, if there is a command arguement, you can get that like this
string id = btn.CommandArgument;
//to get the gridviewrow that the button is on:
GridViewRow row = (GridViewRow)btn.NamingContainer;
}
And change your linkbutton to:
<asp:LinkButton OnClick="linkButton_click" ID="_UIPCCodeLinkButton"
runat="server" Text='<%# Eval("ProfitcenterCode") %>'
CommandName="Select"
CommandArgument='<%# ((GridViewRow) Container).RowIndex %>'>

Why won't my LinkButton inside a GridView raise its OnClick event?

I have a LinkButton inside a GridView (via an TemplateField). No matter what I try, the LinkButton will not invoke its event handler. I have tried both:
A traditional event handler ("OnClick")
A OnRowCommand event handler at the GridView level.
In both cases, I've debugged and it doesn't even catch the event handler.
If I move the LinkButton out on the page (so it's not in the GridView), it works fine, so I know the syntax is right.
Here is the "traditional" method:
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton Text="Cancel" ID="DeleteButton" CausesValidation="false" OnClick="CancelThis" runat="server" />
</ItemTemplate>
<asp:TemplateField>
What's interesting is if I remove the "CancelThis" method from the code behind, it throws an error. So I know it's aware of its event handler, because it looks for it when it compiles.
Here is the RowCommand method:
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton Text="Cancel" ID="DeleteButton" CausesValidation="false" CommandName="CancelThis" runat="server" />
</ItemTemplate>
<asp:TemplateField>
In this case, the GridView has:
OnRowCommand="GridView_RowCommand"
It postsback, but never hints at raising the event.
Any idea what I'm missing here?
How are you binding your GridView? Are you using a datasource control? If you are binding manually during Page_Load, it's possible that since the grid is binding every round trip, the event handler isn't catching properly. If this is the case, you may want to try something like:
protected void Page_Load(object sender, EventArgs e)
{
if(!Page.IsPostBack)
{
//do binding
}
}
Can you post sample binding code to go with your markup?
If you really want to force the issue, you could hook into the RowDataBound event on the Grid, find the button manually and add the handler in the code behind. Something like:
markup snippet:
<asp:GridView ID="gvTest" runat="server" OnRowDataBound="gvTest_RowDataBound" />
code behind:
protected void gvTest_RowDataBound(object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType == DataControlRowType.DataRow)
{
//find button in this row
LinkButton button = e.Row.FindControl("DeleteButton") as button;
if(button != null)
{
button.Click += new EventHandler("DeleteButton_Click");
}
}
}
protected void DeleteButton_Click(object sender, EventArgs e)
{
LinkButton button = (LinkButton)sender;
// do as needed based on button.
}
I'm not sure what the purpose of the button is, but assuming it is a row delete button, you may not want to take this approach as in the event handler, you don't have direct access to the row in question, like you would using the RowCommand event.
Is there a reason you're using the Template field? Vs say a ButtonField? If you use a ButtonField, then you can hook into the RowCommand event.
markup snippet:
<asp:GridView ID="gvTest" runat="server" OnRowCommand="gvTest_RowCommand">
<columns>
<asp:buttonfield buttontype="Link" commandname="Delete" text="Delete"/>
....
</columns>
</asp:GridView>
code behind:
protected void gvTest_RowCommand(object sender, GridViewCommandEventArgs e)
{
if(e.CommandName == "Delete")
{
//take action as needed on this row, for example
int rowIndex = Convert.ToInt32(e.CommandArgument);
GridViewRow currentRow = (sender as GridView).Rows[rowIndex];
//do something against the row...
}
}
You might want to consult MSDN docs on some of these topics:
RowCommandEvent
ButtonField class
EDIT:
To answer your question on the ButtonField - yes I don't see why you couldn't still deal with a buttonfield. Here's a snippet to find the buttonfield during row data bound and hide it (untested but I think would work...)
protected void gvTest_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
//let's assume your buttonfield is in column 1
// (you'd know this based on your markup...)
DataControlFieldCell cell = e.Row.Cells[1] as DataControlFieldCell;
if(cell != null)
{
ButtonField field = cell.ContainingField as ButtonField;
//based on your criteria, show or hide the button
field.Visible = false;
//or
field.Visible = true;
}
}
}
Is viewstate turned on on your GridView? This has caught me out numerous times.
<button onclick="window.open('<%#Eval("ReportLinks")%>', '_blank');" title='<%#Eval("ReportLinks")%>'> Link</button>

details view with Dropdownn control

in the modal pop up i am using detailsview control by default all the data would
be shown in label.
there will be an edit button down once the user clicks edit button all the lablel would be gone and text box and dropdown control should be present so that user can change the values and again update into database
looking forward for a solution. i dnt want to use sqlDatasource. i wanted it to do in .cs
thank you
here is how to:
<EditItemTemplate>
<asp:DropDownList ID="DropDownList1" runat="server" />
</EditItemTemplate>
protected void DetailsView1_DataBound(object sender, EventArgs e)
{
if (DetailsView1.CurrentMode == DetailsViewMode.Edit)
{
DropDownList ddl = DetailsView1.FindControl("DropDownList1") as DropDownList;
if (ddl != null)
{
ddl.DataSource = dataSource;
ddl.DataBind();
}
}
}

Using event of control under datalist

I have a datalist control which some controls(ex: button) are in it. I want to write some code into click event of button which is in the datalist control. But in the code behind page I can't see the name of controls into datalist. How can I solve this problem?
Attach your event to the controls in the OnItemCreated event of the datalist.
EDITED TO ADD SAMPLE
private void DataList_ItemCreated(object sender,
System.Web.UI.WebControls.DataListItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
Button btn = (Button)e.Item.FindControl("btnWhatever");
if (btn != null) btn.Click += new EventHandler(SomHandler);
}
}
If you don't want to add a handler to all the child events, you could instead add your code to the OnItemCommand.
<asp:DataList id="DataList1" runat="server">
<ItemTemplate>
<asp:Button ID="btnDoSomething" Runat=server CommandName="DoSomething"
CommandArgument="<%# DataBinder.Eval(Container.DataItem, "SomeID")
%>"></asp:LinkButton>
</ItemTemplate>
</asp:DataList>
protected void DataList1_ItemCommand(
object source, DataListCommandEventArgs e)
{
if (e.CommandName == "DoSomething")
{
//Do stuff
}
}

Resources