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Editorial Team
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Asked: 2026-05-31T11:27:03+00:00

Good Afternoon Developer, this is my content in asp .net, I want the user

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Good Afternoon Developer,
this is my content in asp .net, I want the user can check only 2 checkbox,exceeding that alert box should pop up.

 <body>
        <form id="form1" runat="server">
        <div>
            <table width="100%">
                <tr>
                    <td>
                    <asp:CheckBox id="q3a" runat="server" Text="Public" />
                    </td>
                    <td>
                    <asp:CheckBox id="q3b" runat="server" Text="void" />
                    </td>
                    <td>
                    <asp:CheckBox id="q3c" runat="server" Text="protected"/>
                    </td>
                    <td>
                    <asp:CheckBox id="q3d" runat="server" Text="return" />
                    </td>
                </tr>
            </table>
            <asp:Button ID="btnSubmit" Text="submit" runat="server"/>
        </div>
        </form>
    </body>

how can i write javascript for this, i have tried but can’t find any way out, Pls help…

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1 Answer

  1. Editorial Team

    You should stop the user the instant they try and select a third option so that only two checked values can ever be submitted and avoid server side validation.

    The client side onchange event should be hooked up to a function similar to this;

    function validationCheck(checkbox) {
  if(checkbox.checked) {
    var count = 0;

    count += document.getElementById('q3a').checked ? 1 : 0;
    count += document.getElementById('q3b').checked ? 1 : 0;
    count += document.getElementById('q3c').checked ? 1 : 0;
    count += document.getElementById('q3d').checked ? 1 : 0;

    if(count > 2) {
      alert('You may only select two options.');
      checkbox.checked = false;
    }
  }
}

    The input should render with onchange="validationCheck(this);".

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