select all checkbox in dropdown

my code is:

aspx page:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ddn.aspx.cs" Inherits="_Default" %>

Grid Validation

my .cs code is:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data;

public partial class _Default : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

DropDownList ddl = new DropDownList();

ddl.ID = "ddlChkList";

ListItem lstItem = new ListItem();

ddl.Items.Insert(0, lstItem);

ddl.Width = new Unit(155);

ddl.Attributes.Add("onmousedown", "showdivonClick()");

//ddl.Attributes.Add("onclick", "chkall()");

CheckBoxList chkBxLst = new CheckBoxList();

chkBxLst.ID = "chkLstItem";

chkBxLst.Attributes.Add("onmouseover", "showdiv()");

//chkBxLst.Attributes.Add("onclick", "chkall()");

DataTable dtListItem = GetListItem();

int rowNo = dtListItem.Rows.Count;

string lstValue = string.Empty;

string lstID = string.Empty;

for (int i = 0; i < rowNo - 1; i++)

{

lstValue = dtListItem.Rows[i]["Value"].ToString();

lstID = dtListItem.Rows[i]["ID"].ToString();

lstItem = new ListItem("" + lstValue + "", dtListItem.Rows[i]["ID"].ToString());

lstItem.Attributes.Add("onclick", "getSelectedItem('" + lstValue + "','" + i + "','" + lstID + "','listItem');");

chkBxLst.Items.Add(lstItem);

}

System.Web.UI.HtmlControls.HtmlGenericControl div = new System.Web.UI.HtmlControls.HtmlGenericControl("div");

div.ID = "divChkList";

div.Controls.Add(chkBxLst);

div.Style.Add("border", "black 1px solid");

div.Style.Add("width", "160px");

div.Style.Add("height", "180px");

div.Style.Add("overflow", "AUTO");

div.Style.Add("display", "none");

ppl.Controls.Add(ddl);

ppl.Controls.Add(div);

if (chkBxLst.SelectedIndex == 1)

{

}

public DataTable GetListItem()

{

DataTable table = new DataTable();

table.Columns.Add("ID", typeof(int));

table.Columns.Add("Value", typeof(string));

table.Rows.Add(1, "all");

table.Rows.Add(2, "ListItem2");

table.Rows.Add(3, "ListItem3");

table.Rows.Add(8, "ListItem8");

return table;

}

please give me a solution for this ....

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

Jaganathan Bantheswaran13y ago
First of all, dont use IDs for elements instead use CSS class names. Because there may be changes on element id conflict.

use same CSS class names for all the checkboxes like,

.check-box {
// style rules..
}

to select all the checkboxes,

jQuery:
$('.check-box') -- this will give you the all check boxes.

Javascript:
document.getElementByClassName('check-box');

You have missed to mention problem which you are facing.