Get multiple selected (checked) CheckBox values inside ASP.Net DataList as Comma Separated String using JavaScript

Hi nagaraju60,

Refer below code.

HTML

<asp:DataList ID="dlItems" runat="server">
    <ItemTemplate>
        <table>
            <tr>
                <td>
                    <asp:CheckBox ID="chk_Select" runat="server" />
                    <%# Eval("chkItem") %>
                </td>
            </tr>
        </table>
    </ItemTemplate>
</asp:DataList>
<br />
<input type="button" value="Get" onclick="GetSelected()" />
<script type="text/javascript">
    function GetSelected() {
        //Create an Array.
        var selected = new Array();
        //Reference the Table.
        var tblFruits = document.getElementById("dlItems");

        //Reference all the CheckBoxes in Table.
        var chks = tblFruits.getElementsByTagName("INPUT");

        // Loop and push the checked CheckBox value in Array.
        for (var i = 0; i < chks.length; i++) {
            if (chks[i].checked) {
                selected.push(chks[i].parentElement.textContent.trim());
            }
        }

        //Display the selected CheckBox values.
        if (selected.length > 0) {
            alert("Selected values: " + selected.join(","));
        } else {
            alert("Please selected one Item.");
        }
    };
</script>

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        System.Data.DataTable dt = new System.Data.DataTable();
        dt.Columns.Add("chkItem");
        dt.Rows.Add("A");
        dt.Rows.Add("B");
        dt.Rows.Add("C");
        dt.Rows.Add("D");
        dt.Rows.Add("E");
        dt.Rows.Add("F");
        this.dlItems.DataSource = dt;
        this.dlItems.DataBind();
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Dim dt As System.Data.DataTable = New System.Data.DataTable()
        dt.Columns.Add("chkItem")
        dt.Rows.Add("A")
        dt.Rows.Add("B")
        dt.Rows.Add("C")
        dt.Rows.Add("D")
        dt.Rows.Add("E")
        dt.Rows.Add("F")
        Me.dlItems.DataSource = dt
        Me.dlItems.DataBind()
    End If
End Sub