Posted by rameshch on July 10, 2008
My button is in user control and i want to hide the button on page based on the differnts events.
it can be solved by the like this
on user control we need to write the function as
‘<%=btnShow.ClientID %>’).disabled=true ;}
function EnableButton() {document.getElementById(‘<%=btnShow.ClientID %>’).disabled=false ; }
function HideReportToExcel() { document.getElementById(‘<%=btnReportToExcel.ClientID %>’).style.visibility = “hidden” ; }
function ShowReportToExcel() {
document.getElementById( ‘<%=btnReportToExcel.ClientID %>’).style.visibility = “visible” ; }
on button we have to mention the style has
<asp:Button ID=”btnReportToExcel” runat=”server” Text=”Report To Excel” ValidationGroup=”submit” style=”visibility:hidden;“ />
another way
function ShowReportToExcel() {
document.getElementById( ‘<%=btnReportToExcel.ClientID %>’).Add.style(display, ’ ‘) ; }
function HideReportToExcel() {
document.getElementById( ‘<%=btnReportToExcel.ClientID %>’).Add.style(display, ’none ‘) ; }
<asp:Button ID=”btnReportToExcel” runat=”server” Text=”Report To Excel” ValidationGroup=”submit” style=”display:none;” OnClick=”OnClick_ReportTOExcel”/>
<asp:Button ID=”btnReportToExcel” runat=”server” Text=”Report To Excel” ValidationGroup=”submit” style=”display:none;” OnClick=”OnClick_ReportTOExcel”/>
on the code behind call this
string script = “if(document.getElementById(‘” + pnlConsumption.ClientID + “‘) != null) { document.getElementById(‘”+ pnlConsumption.ClientID + “‘).style.display=’none’; HideReportToExcel();}”;
ScriptManager.RegisterStartupScript(Page, GetType(), “hidegrid”, script, true);
Posted in Ajax and javaScript | Leave a Comment »
Posted by rameshch on July 10, 2008
when exporting excel in grid view am getting this error
System.Web.HttpException: Control ‘grdReport’ of type ‘GridView’ must be placed inside a form tag with runat=server. and
RegisterForEventValidation can only be called during Render();
The line: grdReport.RenderControl(htw); is tagged as the culprit. The original gridview is in a form tag with runat=server.
my solution as follows
<%@ Page Language="C#" AutoEventWireup="true" Codebehind="GridViewExport.aspx.cs"
Inherits="ForForums.GridViewExport" %>
<!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:GridView ID="CompanyListGridView" AutoGenerateColumns="false" CellPadding="3"
CellSpacing="1" HeaderStyle-HorizontalAlign="Left" RowStyle-VerticalAlign="top"
AlternatingRowStyle-VerticalAlign="top" RowStyle-BackColor="Lavender" AlternatingRowStyle-BackColor="LightBlue"
HeaderStyle-BackColor="#006699" HeaderStyle-ForeColor="White" BorderStyle="None"
BackColor="Black" GridLines="None" EmptyDataRowStyle-BackColor="Lavender" EmptyDataText="No records found."
OnRowCreated="OnRowCreated" runat="server">
<Columns>
<asp:BoundField DataField="CompanyName" ItemStyle-Width="300px" />
</Columns>
</asp:GridView>
<br />
<br />
<asp:Button ID="Button1" runat="server" Text="Export" OnClick="Button1_Click" />
</div>
</form>
</body>
</html>
GridViewExport.aspx.cs:
using System;
using System.Data;
using System.Data.Common;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using Microsoft.Practices.EnterpriseLibrary.Data;
namespace ForForums
{
public partial class GridViewExport : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Database db = DatabaseFactory.CreateDatabase();
LoadCompanyList(db);
}
}
protected void LoadCompanyList(Database db)
{
CompanyListGridView.DataSource = CompanyManager.GetCompanies(db);
CompanyListGridView.DataBind();
}
protected void OnRowCreated(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.Header)
foreach (TableCell headerCell in e.Row.Cells)
headerCell.Text = "Company Name";
}
protected void Button1_Click(object sender, EventArgs e)
{
GridViewExportUtil.Export("Companies.xls", this.CompanyListGridView);
}
}
}
And a class file, GridViewExport.cs :
using System;
using System.Data;
using System.Configuration;
using System.IO;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public class GridViewExportUtil
{
public static void Export(string fileName, GridView gv)
{
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.AddHeader(
"content-disposition", string.Format("attachment; filename={0}", fileName));
HttpContext.Current.Response.ContentType = "application/ms-excel";
using (StringWriter sw = new StringWriter())
{
using (HtmlTextWriter htw = new HtmlTextWriter(sw))
{
// Create a form to contain the grid
Table table = new Table();
// add the header row to the table
if (gv.HeaderRow != null)
{
GridViewExportUtil.PrepareControlForExport(gv.HeaderRow);
table.Rows.Add(gv.HeaderRow);
}
// add each of the data rows to the table
foreach (GridViewRow row in gv.Rows)
{
GridViewExportUtil.PrepareControlForExport(row);
table.Rows.Add(row);
}
// add the footer row to the table
if (gv.FooterRow != null)
{
GridViewExportUtil.PrepareControlForExport(gv.FooterRow);
table.Rows.Add(gv.FooterRow);
}
// render the table into the htmlwriter
table.RenderControl(htw);
// render the htmlwriter into the response
HttpContext.Current.Response.Write(sw.ToString());
HttpContext.Current.Response.End();
}
}
}
/// <summary>
/// Replace any of the contained controls with literals
/// </summary>
/// <param name="control"></param>
private static void PrepareControlForExport(Control control)
{
for (int i = 0; i < control.Controls.Count; i++)
{
Control current = control.Controls[i];
if (current is LinkButton)
{
control.Controls.Remove(current);
control.Controls.AddAt(i, new LiteralControl((current as LinkButton).Text));
}
else if (current is ImageButton)
{
control.Controls.Remove(current);
control.Controls.AddAt(i, new LiteralControl((current as ImageButton).AlternateText));
}
else if (current is HyperLink)
{
control.Controls.Remove(current);
control.Controls.AddAt(i, new LiteralControl((current as HyperLink).Text));
}
else if (current is DropDownList)
{
control.Controls.Remove(current);
control.Controls.AddAt(i, new LiteralControl((current as DropDownList).SelectedItem.Text));
}
else if (current is CheckBox)
{
control.Controls.Remove(current);
control.Controls.AddAt(i, new LiteralControl((current as CheckBox).Checked ? "True" : "False"));
}
if (current.HasControls())
{
GridViewExportUtil.PrepareControlForExport(current);
}
}
}
}
Posted in C# | 1 Comment »
Posted by rameshch on July 10, 2008
This is taken from the MSDN library:
the ASP.NET page framework also supports an automatic way to associate page events and methods. If the AutoEventWireup attribute of the Page directive is set to true (or if it is missing, since by default it is true), the page framework calls page events automatically, specifically the Page_Init and Page_Load methods. In that case, no explicit Handles clause or delegate is needed.
The disadvantage of the AutoEventWireup attribute is that it requires that the page event handlers have specific, predictable names. This limits your flexibility in how you name your event handlers. Therefore, in Visual Studio, the AutoEventWireup attribute is set to false by default and the designer generates explicit code to bind page events to methods.
If you do set AutoEventWireup to true, Visual Studio will generate code to bind the events and the page framework will automatically call events based on their names. This can result in the same event code being called twice when the page runs. As a consequence, you should always leave AutoEventWireup set to false when working in Visual Studio.
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