checkbox validation in asp.net C# or Javascript

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Hi frnds,

checkbox validation in asp.net C# or Javascript

I have 10 checkboxes on my webpage, from these atleast 3 checkboxes must be selected
User can select checkboxes in sequential order.

I need validation on submit button click.
(atleast 3 checkbox must be selected).

My checkboxes are from Checkbox1 to Checkbox10

Please can you help me.

Thanks.

Posted 8-Dec-14 22:52pm

Software Engineer 892

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DamithSL 9-Dec-14 5:08am

please update the question with html code and javascript which you already tried

3 solutions

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Thanks7872 · Answer 1 · 2014-12-08T23:20:00

C#

<script type="text/javascript">
       $(document).ready(function () {
           $("#btnSubmit").click(function () {
               if($('input[type=checkbox]:checked').length<3)
               {
                   //give error message
                   return false;
               }
             //this code will get executed if atleast 3 checkboxes are checked
           });
       });
   </script>

You can use this code inside function also. Onclientclick of button,call that function and proceed with button click accordingly.

Regards...

Praveen Kumar Upadhyay · Answer 2 · 2014-12-08T23:31:00

Below is the Javascript code which will check for at least 3 checkbox selected in sequence.

C#

function ValidateCheckboxes() {
            var inputElems = document.getElementsByTagName("input"),
            count = 0;
            for (var i = 0; i < inputElems.length; i++)
            {
                if (inputElems[i].type === "checkbox" && inputElems[i].checked === true)
                {
                    ++count;
                }
                else if (inputElems[i].type === "checkbox" && inputElems[i].checked === false)
                {
                    //This break section will ensure that checkboxes are selected in sequence  
                    break;
                }
            }

            if (count < 3) {
                alert("Please select at least 3 checkbox in sequence");
                return false;
            }

            return true;

        }

Aspx code

XML

<div id="checkboxes">
           <asp:CheckBox ID="CheckBox1" Text="1" runat="server" />
           <asp:CheckBox ID="CheckBox2" Text="2" runat="server" />
           <asp:CheckBox ID="CheckBox3" Text="3" runat="server" />
           <asp:CheckBox ID="CheckBox4" Text="4" runat="server" />
           <asp:CheckBox ID="CheckBox5" Text="5" runat="server" />
           <asp:CheckBox ID="CheckBox6" Text="6" runat="server" />
           <asp:CheckBox ID="CheckBox7" Text="7" runat="server" />
           <asp:CheckBox ID="CheckBox8" Text="8" runat="server" />
           <asp:CheckBox ID="CheckBox9" Text="9" runat="server" />
           <asp:CheckBox ID="CheckBox10" Text="10" runat="server" />
       </div>
       <asp:Button Text="CheckboxCheck" ID="btn_checkboxCheck" runat="server" OnClientClick="return ValidateCheckboxes();" />
   </div>

mudgilsks · Answer 3 · 2014-12-08T23:08:00

Solution 1

hi,

at the clicking of submit btn take a variable that hold the count of selected ckeckbox.

as variable a

a=0
if (checkbox1.checked=true)
a=a+1

VB

if (checkbox2.checked=true)
a=a+1

......

....

VB

if (checkbox10.checked=true)
a=a+1

if a>=3{
true
}

else
false

Posted 8-Dec-14 23:08pm

mudgilsks

checkbox validation in asp.net C# or Javascript

3 solutions

Solution 2

Solution 3

Solution 1

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