Enable Disable TextBox on CheckBox selection in Table row using JavaScript

Hi Nehaadawa.

Kindly refer below sample.

HTML

<table id="tblDetails">
    <tr>
        <td><asp:CheckBox runat="server" /></td>
        <td><asp:TextBox runat="server" Enabled="false"></asp:TextBox></td>
    </tr>
    <tr>
        <td><asp:CheckBox runat="server" /></td>
        <td><asp:TextBox runat="server" Enabled="false"></asp:TextBox></td>
    </tr>
</table>
<script type="text/javascript">
    window.onload = function () {
        var table = document.getElementById("tblDetails");
        var tbody = table.getElementsByTagName("tbody")[0];
        tbody.onclick = function (e) {
            var target = e.target || e.srcElement;
            if (target && target.type === "checkbox") {
                var tr = target.parentNode.parentNode;
                var elems = tr.getElementsByTagName("input");
                for (var i = 1; i < elems.length; i++) {
                    elems[i].disabled = target.checked ? false : true;
                }
            }
        }
    }
</script>

Screenshot