how to give default selection for checklist on checkbox selected

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Please help how can i give default selection to my checklist on checkbox selection
for eg:
<asp:checkbox id="chkbox1" runat= "server"/>

This is my main checkbox an on this selection my checklist value should be default true so that user can see the selection and i can save it as a parameter in my stored procedure
<asp:checkboxlist id="chkoptn" runat="server>
<asp:listitem>1<asp:listitem>
<asp:listitem>2<asp:listitem>
<asp:listitem>3<asp:listitem>
<asp:listitem>4<asp:listitem>

Please let me know how can i do

Posted 7-Aug-12 20:06pm

priti2010

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Sergey Alexandrovich Kryukov 8-Aug-12 2:14am

After postback, new selection to become default? Or one default for all cases?
--SA

2 solutions

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Prasad J · Answer 1 · 2012-08-07T20:16:00

Solution 2

In the aspx side you can specify the selected="true" to the listitem

XML

<asp:CheckBoxList ID="CheckBoxList1" runat="server">
            <asp:ListItem>Item1</asp:ListItem>
            <asp:ListItem>Item2</asp:ListItem>
            <asp:ListItem>Item3</asp:ListItem>
            <asp:ListItem Selected="True">Item4</asp:ListItem>
        </asp:CheckBoxList>

You can set it from the code-behind also,

C#

CheckBoxList1.Items[1].Selected = true;
CheckBoxList1.Items[2].Selected = true;

Posted 7-Aug-12 20:16pm

Prasad J

Comments

priti2010 8-Aug-12 2:21am

ok then how this value should be passed as parameter because if checked then values should get inserted

Prasad J 8-Aug-12 2:53am

You can get the checked values from the checkboxlist as:
string values = getCheckBoxValues();
private string getCheckBoxValues()
{
string value = "";
for (int loopIndex = 0; loopIndex < CheckBoxList1.Items.Count; loopIndex++)
{
if (CheckBoxList1.Items[loopIndex].Selected)
value += "true,";
else
value += "false,";
}
return value.TrimEnd(',');
}

Also, you can preset the values by calling
presetChechbox("true,true,false,false");
private void presetChechbox(string value)
{
string[] values = value.Split(',');
// Ensure both chechbox itexs and string contain same number of items.
if (values.Length != CheckBoxList1.Items.Count)
return;

for (int loopIndex = 0; loopIndex < CheckBoxList1.Items.Count; loopIndex++)
{
bool selectedVal=false;
bool.TryParse(values[loopIndex], out selectedVal);
CheckBoxList1.Items[loopIndex].Selected = selectedVal;
}
}

Sergey Alexandrovich Kryukov · Answer 2 · 2012-08-07T20:14:00

Solution 1

This is the attribute selected="true" to be added to one of the choices (a listitem, in terms of ASP.NET controls).

—SA

Posted 7-Aug-12 20:14pm

Sergey Alexandrovich Kryukov

Updated 7-Aug-12 20:15pm

v2

Comments

priti2010 8-Aug-12 2:18am

i have did that but i give me list of values whose listitem is checked or unchecked but i want it by default true on main checkbox select

Sergey Alexandrovich Kryukov 30-Oct-12 0:30am

Excuse me?
--SA