How to make a CheckBoxList Validator

Question

I have a Checkboxlist, and I cannot provide it with a required authentication module or a custom validator. this gives me an exception at runtime.

Language: Vb.net with asp.net

Answer 1

no cannot apply the required field validator in the checkbox list

but you can use a special validator to test it

for the custom validator to work, you need to create your own function on the server or on the client side for verification, and one more thing when you use the custom validator is there is no need to pass the value in the property controltovalidate

Answer 2

with jQuery and ASP.Net CustomValidator:

function validateCheckBoxList(sender, args) {
    args.IsValid = ($("#CheckBoxListId :checked").length > 0);
}

<asp:CustomValidator ID="CustomValidator" runat="server" ErrorMessage="Required!" ClientValidationFunction="validateCheckBoxList"></asp:CustomValidator>

https://jsfiddle.net/t8qj4tqb/

Answer 3

function CheckBoxListValidator(source, arguments) {
            var Control;
            Control = document.getElementById("CKlistVehicleBodies").getElementsByTagName("input");
            var check = false;
            if (eval(Control)) {
                for (var i = 0; i < Control.length; i++) {
                    if (Control[i].tagName == 'INPUT') {

                        if (Control[i].checked) {
                            check = true;
                        }
                    }
                }
                if (!check)
                    arguments.IsValid = false;
                else
                    arguments.IsValid = true;
            }
        }

Answer 4

, , .NET, - , , . AJAX. , .

http://www.aboutfortunate.com/Component-Library/Checkboxlist-Required-Field-Validator.aspx

Answer 5

skmValidators .

Validator CheckBox CheckBoxList