Uncheck the CheckBox box based on another CheckBox

Question

I want to select and deselect all the checkboxes when the user clicks on the first checkbox (All) . And if the user deactivates a flag, then only this flag and the first flag (All) should be unchecked and will not be changed to the rest of the flags.

I have Checkboxliston my page that I dynamically populate.

<asp:CheckBoxList runat="server" ID="cbExtList" />

Code for

private Extensions _extension = new Extensions();
private ExtCollection _extCollection = new ExtCollection();

_extCollection = _extension.GetAll();

Dictionary<int, string> dExtensions = new Dictionary<int, string>();

dExtensions.Add(0, "All");
foreach (Extensions ext in _extCollection)
{
    dExtensions.Add(ext.ID, ext.Extension);
}

this.cbExtList.DataSource = dExtensions;
this.cbExtList.DataTextField = "Value";
this.cbExtList.DataValueField = "Key";
this.cbExtList.DataBind();

Now everything is working fine. I just want to select all the extensions when I click on the first “All” checkbox in that Checkboxlist.

This is what I tried with a code based approach.

Using OnSelectedIndexChangedand InstallingAutoPostBack = True

<asp:CheckBoxList runat="server" ID="cbExtList" OnSelectedIndexChanged="cbExtList_OnSelectedIndexChanged" AutoPostBack="True" />

protected void cbExtList_OnSelectedIndexChanged(object sender, EventArgs e)
{
    try
    {
        if (Convert.ToInt32(this.cbExtList.SelectedItem.Value) == 0)
        {
            foreach (ListItem li in cbExtList.Items)
            {
                li.Selected = true;
            }
        }
        else
        {
            foreach (ListItem li in cbExtList.Items)
            {
                li.Selected = false;
            }
        }
    }
    catch (Exception ex)
    {
        Monitoring.WriteException(ex);
    }
}

Answer 1

Edited

JQuery .

JQuery , .

$(document).ready(function() {

    $('[id$=checkAllExts]').click(function () {
        $('input:checkbox').not(this).prop('checked', this.checked);
    });

    $("[id*=cbExtList_]").change(function () {
        if ($('input[id*=cbExtList_][type=checkbox]:checked').length == $('input[id*=cbExtList_][type=checkbox]').length) {
            $('[id$=checkAllExts]').prop('checked', true);
        } else {
            $('[id$=checkAllExts]').prop('checked', false);
        }
    });

});

ASP.NET JQuery, .

[ $= "" ]

, . .

[ * = "" ]

, .

$('[id$=checkAllExts]') , / .

$('[id$=cbExtList_]') , parent, .

CheckBoxList JavaScript .

JavaScript- .

<script type="text/javascript">
        var Counter;

        function ExtAll(CheckBox)
        {
            //Get target base & child control.
            var TargetBaseControl = document.getElementById('<%= this.leftCB.ClientID %>');
            var TargetChildControl = "cbExtList";

            //Get all the control of the type INPUT in the base control.
            var Inputs = TargetBaseControl.getElementsByTagName("input");

            //Checked/Unchecked all the checkBoxes.
            for (var n = 0; n < Inputs.length; ++n) {
                if (Inputs[n].type == 'checkbox' && Inputs[n].id.indexOf(TargetChildControl, 0) >= 0)
                    Inputs[n].checked = CheckBox.checked;
                //Reset Counter
            }
            Counter = CheckBox.checked ? TotalChkBx : 0;
        }

        function ChildClick(CheckBox, HCheckBox)
        {
            //get target base & child control.
            var HeaderCheckBox = document.getElementById(HCheckBox);

            //Modifiy Counter;            
            if(CheckBox.checked && Counter < TotalChkBx)
                Counter++;
            else if(Counter > 0) 
                Counter--;

            //Change state of the header CheckBox.
            if(Counter < TotalChkBx)
                HeaderCheckBox.checked = false;
            else if(Counter == TotalChkBx)
                HeaderCheckBox.checked = true;
        }
</script>

checkboxlist, / . javascript, onclick.

<div id="leftCB" class="lbl" style="padding-left: 0px;" runat="server">
    <asp:CheckBox runat="server" ID="checkAllExts" Text="All" onclick="javascript:ExtAll(this);" />
    <asp:CheckBoxList runat="server" ID="cbExtList" />
</div>

private Extensions _extension = new Extensions();
private ExtCollection _extCollection = new ExtCollection();

_extCollection = _extension.GetAll();

Dictionary<int, string> dExtensions = new Dictionary<int, string>();

foreach (Extensions ext in _extCollection)
{
    dExtensions.Add(ext.ID, ext.Extension);

    // Added the below line for the functionality of CheckBoxList
    // which adds an attribute with all of the checkboxes in the CheckBoxList

    this.cbExtList.Attributes["onclick"] = string.Format("javascript:ChildClick(this,'{0}');", this.checkAllExts.ClientID);
}

this.cbExtList.DataSource = dExtensions;
this.cbExtList.DataTextField = "Value";
this.cbExtList.DataValueField = "Key";
this.cbExtList.DataBind();

Answer 2

jQuery Javascript / All.

ASPX:

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
    <script src="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.8.23/jquery-ui.min.js" type="text/javascript"></script>

    <script type="text/javascript">
        var checkedState = false;

        function checkAll() {

            $("input[id^=cblMultiple]").each(function () {
                if ($(this).val() == 0) {
                    checkedState = $(this).is(":checked")
                }
                else {
                    $(this).attr("checked", checkedState)
                }
                //console.log(checkedState);
                //console.log($(this).val());
            });
        }

        $(document).ready(function () {
            $("input[id^=cblMultiple]").each(function () {
                if ($(this).val() == 0) {
                    $(this).on("click", checkAll);
                }
            });
        });

    </script>
</head>
<body>

    <form id="form1" runat="server">
        <asp:CheckBoxList runat="server" ID="cblMultiple"/>
    </form>
</body>
</html>

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        cblMultiple.Items.Add(new ListItem("All", "0"));
        for (int i = 1; i < 11; i++)
        {
            cblMultiple.Items.Add(new ListItem("All" + i, i.ToString()));
        }    
    }
}

Answer 3

Selected true/false:

for (int i = 0; i < cbExtList.Items.Count; i++)
        {
            cbExtList.Items[i].Selected = true;
        }