Check/Uncheck All items in CheckBoxList in ASP.NET

Question

I have a CheckBoxList like following

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        CheckBoxList1.Items.Add(new ListItem("Check/Uncheck All","0"));
        CheckBoxList1.Items.Add(new ListItem("A","1"));
        CheckBoxList1.Items.Add(new ListItem("B","2"));
        CheckBoxList1.Items.Add(new ListItem("C", "3"));
        CheckBoxList1.Items.Add(new ListItem("D", "4"));
    }        
}

I want whenever the first item is checked to check the rest of the items and whenever unchecked to uncheck the rest. Also the user can select every item separately.

I want do this with code behind without JavaScript or JQuery.

Samiey Mehdi · Accepted Answer · 2013-10-04 05:56:09Z

6

Try this

protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e)
{
    string result = Request.Form["__EVENTTARGET"];
    int index1 = int.Parse(result.Substring(result.IndexOf("$") + 1));
    if (index1 == 0)
    {
        bool tf = CheckBoxList1.Items[index1].Selected ? true : false;
        CheckUncheckAll(tf);
    }
}
void CheckUncheckAll(bool tf)
{
    foreach (ListItem item in CheckBoxList1.Items)
    {
        item.Selected = tf;
    }
}

edited Oct 4, 2013 at 5:56

answered Sep 25, 2013 at 16:18

Samiey Mehdi

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1 Comment

Rani Radcliff Over a year ago

I was hoping this would work for me, but this line ' int index1 = int.Parse(result.Substring(result.IndexOf("$") + 1' throws error that string is in the wrong format.

Dale K · Accepted Answer · 2019-10-09 06:38:46Z

2

for(int index = 0; index < checkedListBox.Items.Count; ++index)
{
    checkedListBox.SetItemChecked(index, false);
}

edited Oct 9, 2019 at 6:38

Dale K

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answered Nov 25, 2014 at 12:54

user3895427

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Comments

Azadeh Khojandi · Accepted Answer · 2014-05-20 00:51:10Z

There is a generic way of having a select all item in asp CheckBoxList with using jquery. You can have as many as CheckBoxList controls on the form with the select all functionality. you only need to make sure

Your CheckBoxList has allowSelectAll Class
You added a ListItem to your checkbox list to allow users to select All with the value of All

chkBoxList.Items.Insert(0, new ListItem("All", "All"));

you Only need the following code

<script>
    $('.allowSelectAll :checkbox[value=All]').click(function () {
        var toggle = this.checked;
        $(this).closest('.allowSelectAll').find(":checkbox").attr("checked", toggle);
    });
</script>

In the following code spinet I have 4 Checkbox lists

<div >
<label>Experience 1</label>
<asp:CheckBoxList ID="chklstExp1" runat="server"  CssClass="allowSelectAll">
</asp:CheckBoxList>

<label>Experience 2</label>
<asp:CheckBoxList ID="chklstExp2" runat="server" CssClass="allowSelectAll">
</asp:CheckBoxList>

<label>Experience 3</label>
<asp:CheckBoxList ID="chklstExp3" runat="server" CssClass="allowSelectAll">
</asp:CheckBoxList>

<label>Location</label>
<asp:CheckBoxList ID="chklstLocation" runat="server" CssClass="allowSelectAll">
</asp:CheckBoxList>

<asp:Button runat="server" ID="btnShowReport" OnClick="btnShowReport_Click" Text="Show Report"/>
</div>

Bartłomiej Semańczyk · Accepted Answer · 2015-12-17 10:41:12Z

1

With this piece of code, you could be able to access the checkbox from C# code behind and could be able to check/uncheck them or even enable/disable them. Hope it might help.

foreach (ListItem item in CheckBoxList.Items) {
    item.Selected = true;
    item.Enabled = true;
}

edited Dec 17, 2015 at 10:41

Bartłomiej Semańczyk

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answered Dec 17, 2015 at 10:22

VAMSHI PAIDIMARRI

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Comments

Akash Sarawagi · Accepted Answer · 2013-09-25 17:37:57Z

0

in .aspx page please add autopostback="true" for checkboxlist

then please add this event. Its working i have checked it.

Private Sub CheckBoxList1_SelectedIndexChsanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles CheckBoxList1.SelectedIndexChanged
    Dim result As String = Request.Form("__EVENTTARGET")
    Dim checkedBox As String() = result.Split("$"c)
    Dim index As Integer = Integer.Parse(checkedBox(checkedBox.Length - 1))
    If CheckBoxList1.Items(index).Text = "Check/Uncheck All" Then
        Dim Chkbool As Boolean = CheckBoxList1.Items(index).Selected
        For Each item In CheckBoxList1.Items
            item.selected = Chkbool
        Next
    End If
End Sub

answered Sep 25, 2013 at 17:37

Akash Sarawagi

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Comments

EJoshuaS - Stand with Ukraine · Accepted Answer · 2017-02-28 05:16:45Z

0

For making items false you need to do:

checkList.ClearSelection();

For making items as true:

foreach (var item in checkList.Items.Cast<ListItem>().Where (li => li.Value == "1" || li.Value == "3" || li.Value == "5"))
{
   item.Selected = true;
}

edited Feb 28, 2017 at 5:16

EJoshuaS - Stand with Ukraine

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answered Feb 28, 2017 at 5:11

Anu

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Comments

ArunPratap · Accepted Answer · 2018-06-11 07:49:51Z

0

for Check all

foreach (ListItem item in CheckBoxList.Items)
{
    item.Selected = true;    
}

for unchek all

 CheckBoxList.ClearSelection();

answered Jun 11, 2018 at 7:49

ArunPratap

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Comments

Jitender Sharma · Accepted Answer · 2023-06-22 16:41:38Z

0

I have one radiobuttonlist and chechboxlist. checkboxlist's selection is changed automatically according to selection radiobuttonlist item selection. below are the image of output and code: hope it will help you.

protected void RadioButtonList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (RadioButtonList1.SelectedValue == "0")
        {
            foreach (ListItem item in CheckBoxList1.Items)
            {
                item.Selected = true;
            }
        }
        if (RadioButtonList1.SelectedValue == "1")
        {
            CheckBoxList1.ClearSelection();

        }

edited Jun 22, 2023 at 16:41

answered Jun 22, 2023 at 16:41

Jitender Sharma

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