I am using one aspxGridview where I used checkbox. Now I need when I check any of the row particular column value I should get in server side to complete my business logic.
Below is the gridview used:
<dx:ASPxGridView KeyFieldName="PracticeID" ID="ASPxGrd" runat="server" ClientInstanceName="grid"
ClientIDMode="AutoID" AutoGenerateColumns="false" Width="100%" OnSelectionChanged="ASPxGrd_SelectionChanged">
<Columns>
<dx:GridViewDataColumn VisibleIndex="0" Name="CheckBoxColumn">
<DataItemTemplate>
<dx:ASPxCheckBox ID="ASPxCheckBox1" runat="server" OnCheckedChanged="ASPxCheckBox1_CheckedChanged" AutoPostBack="true">
</dx:ASPxCheckBox>
</DataItemTemplate>
</dx:GridViewDataColumn>
<dx:GridViewDataColumn FieldName="PracticeName" Caption="Description" VisibleIndex="1">
<FooterTemplate>
Total:
</FooterTemplate>
</dx:GridViewDataColumn>
</dx:ASPxGridView>
I have tried to use oncheckedevent in checkbox with auto postback true and used code to get selected row like below:
protected void ASPxCheckBox1_CheckedChanged(object sender, EventArgs e)
{
ASPxGridView grid = sender as ASPxGridView;
string currentMasterKey = Convert.ToString(grid.GetMasterRowKeyValue());
}
but getting null value of grid object.
Need help.
In your example you have used DataItemTemplate, so in that case the sender will be the control which is added in that data template i.e ASPxCheckBox and you are casting it to grid bcoz of that it is getting null.
try out below snippet.
protected void ASPxCheckBox1_CheckedChanged(object sender, EventArgs e)
{
ASPxCheckBox checkBox = sender as ASPxCheckBox;
var grid = (checkBox.NamingContainer as DevExpress.Web.ASPxGridView.GridViewDataItemTemplateContainer).Grid;
string currentMasterKey = Convert.ToString(grid.GetMasterRowKeyValue());
}
I found this answer before and it's working fine like below:
for (int i = 0; i < ASPxGrd.VisibleRowCount; i++)
{
ASPxCheckBox chk = ASPxGrd.FindRowCellTemplateControl(i, null, "ASPxCheckBox1") as ASPxCheckBox;
if (chk.Checked)
{
if (i == 0)
{
practiceName = ASPxGrd.GetRowValues(i, "PracticeName").ToString();
}
}
}
using this code i am able to get selected checkbox column value.
Related
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;
}
}
}
I'm having a problem trying to find a label control that is inside a GridView.
Please see my codes below:
<asp:GridView ID="MyGridView" runat="server">
<Columns>
<asp:TemplateField HeaderText="Date">
<ItemTemplate>
<asp:TextBox runat="server" ID="txtDate" MaxLength="10" Width="70" />
<asp:ImageButton ID="imgScoreDate" runat="server" ImageUrl="~/images/calendar.gif" />
<ajaxtoolkit:CalendarExtender ID="txtDate_CalendarExtender" runat="server" Enabled="True" Format="MM/dd/yyyy" TargetControlID="txtDate" PopupButtonID="imgDate" />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Name">
<ItemTemplate>
<asp:Label ID="lblName" runat="server"/>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
And here is my .cs file:
protected void LoadGridView()
{
//Do something else
foreach (GridViewRow row in MyGridView.Rows)
{
//Tried A
System.Web.UI.WebControls.Label lblName = row.FindControl("lblName") as System.Web.UI.WebControls.Label;
lblName.Text = "Name";
//Tried B
((System.Web.UI.WebControls.Label)row.FindControl("lblName")).Text = "Name";
}
}
I debug this code and it seems to work fine because my breakpoint is being hit each time the debugger runs. It even loops through my foreach block the same count as to how many rows my GridView has.
But I don't understand why my lblName control doesn't get the "Name" text as a value? Am I missing anything here? I tried both //Tried A and //Tried B methods but they both doesn't update my label's text.
Any help would be appreciated!
Thanks! Cheers!
You want to call LoadGridView inside PreRender. Basically, you want to call it after GridView is bound with data.
protected void Page_PreRender(object sender, EventArgs e)
{
LoadGridView();
}
Look at PreRender event of ASP.NET Page Life Cycle.
On your gridview add:
<asp:GridView OnRowDataBound="MyGridView_RowDataBound" ... />
Then define MyGridView_RowDataBound:
void CustomersGridView_RowDataBound(Object sender, GridViewRowEventArgs e)
{
Label l = (Label) e.Row.FindControl("lblName");
}
What I think is happening is the control is not recreated server side in its current spot.
try this
on .aspx page
<asp:GridView ID="MyGridView" runat="server"
onrowdatabound="MyGridView_RowDataBound" .../>
code behind ::
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
LoadGridView();
}
}
void LoadGridView()
{
DataTable dt = new DataTable();
// dt= call ur database method to get data
MyGridView.DataSource = dt;
MyGridView.DataBind();
}
protected void MyGridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
Label lbl_Name = (Label)e.Row.FindControl("lblName");
lbl_Name.Text = "Name";
}
}
cheers!
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 %>'>
I have datagrid with paging enabled that can have 10 rows per page. Also I have DataTable with 16 rows. I want to fill the datagrid dynamically with 'for' loop to go over all the DataTable and fill the DataGrid.
I understand that there is a problem when the counter will hit row 11. Do I need to change the page of the datagrid when counter will be 11? Because it doesnt let me add more than 10 rows in the datagrid.
Would appriciate if someone can tell me how to implement it.
Thanks in advance,
Greg
This is pretty much how I'd do it. I'm not using a for as the conditional checking of checkboxes is in ItemDataBound, by doing it this way the DataGrid will do all the paging for me.
Markup:
<asp:DataGrid runat="server" ID="MyDataGrid" AllowPaging="true" PageSize="10" OnPageIndexChanged="MyDataGrid_PageIndexChanged" OnItemDataBound="MyDataGrid_ItemDataBound" Autogeneratecolumns="false">
<Columns>
<asp:BoundColumn DataField="Number" HeaderText="Number" />
<asp:TemplateColumn>
<ItemTemplate>
<asp:CheckBox runat="server" ID="CheckBox" />
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:DataGrid>
Code-behind:
protected void Page_Load(object sender, EventArgs e)
{
DataTable numberDataTable;
if (!IsPostBack)
{
// Build a 16-row DataTable
numberDataTable = new DataTable();
numberDataTable.Columns.Add(new DataColumn("Number"));
for (int c = 1; c < 17; c++)
{
DataRow numberDataRow = numberDataTable.NewRow();
numberDataRow[0] = c;
numberDataTable.Rows.Add(numberDataRow);
}
ViewState.Add("Data", numberDataTable);
// DataBind the table into the DataGrid
MyDataGrid.DataSource = numberDataTable;
MyDataGrid.DataBind();
}
}
protected void MyDataGrid_PageIndexChanged(object sender, DataGridPageChangedEventArgs e)
{
DataTable numberDataTable;
// Get the DataTable out of Viewstate
numberDataTable = (DataTable)ViewState["Data"];
// Set the new page number
MyDataGrid.CurrentPageIndex = e.NewPageIndex;
// Bind the grid
MyDataGrid.DataSource = numberDataTable;
MyDataGrid.DataBind();
}
protected void MyDataGrid_ItemDataBound(object sender, DataGridItemEventArgs e)
{
DataRow numberDataRow;
// Selective checking of the CheckBox
// Only do this for Item and ALternatingItem, we don't do this for headers, footers etc
if (e.Item.ItemType == ListItemType.Item | e.Item.ItemType == ListItemType.AlternatingItem)
{
numberDataRow = ((DataRowView)e.Item.DataItem).Row;
// Check if we have an even number
if ((int.Parse(numberDataRow[0].ToString()) % 2) == 0)
{
// Find our checkbox control in the DataGrid for the current row and check it
CheckBox checkBox = (CheckBox)e.Item.FindControl("CheckBox");
checkBox.Checked = true;
}
}
}
This gives:
I have a GridView...
<asp:GridView EnableViewState="true"
ID="grdResults"
runat="server"
CssClass="resultsGrid"
OnRowDataBound="grdResults_OnRowDataBound"
AutoGenerateColumns="false"
HeaderStyle-CssClass="header"
OnRowCommand="grdResults_OnRowCommand">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="lblView"
runat="server"
Visible="false"
Text="View">
</asp:Label>
<asp:HyperLink ID="hypEdit"
runat="server"
Visible="false"
Text="(Edit)"
CssClass="edit">
</asp:HyperLink>
<asp:LinkButton ID="btnDelete"
runat="server"
Visible="false"
Text="(Delete)"
CssClass="delete"
CommandName="DeleteItem"
OnClientClick="return confirm('Are you sure you want to delete?')">
</asp:LinkButton>
<asp:HyperLink ID="hypSelect"
runat="server"
Visible="false"
Text="(Select)"
CssClass="select">
</asp:HyperLink>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
This has one static column containing a label two hyperlinks and a link button and also has a number of dynamically generated columns...
private void SetupColumnStructure(IEnumerable<string> columnNames)
{
var columnNumber = 0;
foreach (var columnName in columnNames)
{
var templateColumn = new TemplateField
{
ItemTemplate = new CellTemplate(columnName)
};
grdResults.Columns.Insert(columnNumber, templateColumn);
columnNumber++;
}
}
As part of the OnRowDataBound handler I retrieve one of the controls in the statically column and set some attributes on it...
protected void grdResults_OnRowDataBound(object sender, GridViewRowEventArgs e)
{
.
.
.
var row = e.Row;
var rowData = row.DataItem as Dictionary<string, object>;
if (rowData != null)
{
if ((bool)rowData[displayEditLink])
{
var hypEdit = (HyperLink)row.FindControl("hypEdit");
hypEdit.NavigateUrl = "~/Pages/Edit.aspx?action=Edit&objectType=" + rowData[objectTypeLiteral] + "&id=" + rowData[objectIdLiteral];
hypEdit.Visible = true;
}
}
.
.
.
}
This all works fine but no column names are displayed. So I then modify the SetupColumnStructure method so that the HeaderText is set on the template field like this...
private void SetupColumnStructure(IEnumerable<string> columnNames)
{
var columnNumber = 0;
foreach (var columnName in columnNames)
{
var templateColumn = new TemplateField
{
ItemTemplate = new CellTemplate(columnName),
HeaderText = columnName
};
grdResults.Columns.Insert(columnNumber, templateColumn);
columnNumber++;
}
}
For some reason this one extra line change causes the row.FindControl("hypEdit"); call in the OnRowDataBound handler to return null.Can anyone see something im missing here or has anyone experienced a similar issue?
UPDATE
I've made sure that I'm not referring to a header or footer row here. Also, if I step over the object reference exception this occurs for every item that is in the DataSource.
Not sure if this helps, but as I expected, when I stepped through the code the table has generated all the columns expected but all cells (DataControlFieldCells) contain no controls when the HeaderText is set, yet all expected controls when it isnt set.
All very strange. Let me know if you can spot anything else.
When you added the HeaderText, a new RowType was added to the gridview. You'll need to check what type of row raised the OnRowDataBound event and take the appropriate action. In your case, just checking if the e.Row.RowType is a DataRow should solve your problem:
protected void grdResults_OnRowDataBound(object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType == DataControlRowType.DataRow)
{
if ((bool)rowData[displayEditLink])
{
var hypEdit = (HyperLink)row.FindControl("hypEdit");
hypEdit.NavigateUrl = "~/Pages/Edit.aspx?action=Edit&objectType=" + rowData[objectTypeLiteral] + "&id=" + rowData[objectIdLiteral];
hypEdit.Visible = true;
}
}
}
Its because the control you are searching for is contained within another control. FindControl() does not look inside control collections of controls. You will need to write a recursiveFindControl() method.
Hope this helps a little!