Question

In my MVC Application my form contains a checkbox and dropdownlist.When i check the checkbox to true i want to disable dropdownlist and vice versa. Also i want to populate a ‘None’ value as the selected item in dropdownlist, there is some other datas in dropdownlist populating from db. There have any solution? Please help me to resolve this.
Thanks

Answer 1

You will need to use javascript for this. With jQuery you could subscribe to the .change event of the checkbox and toggle the dropdown’s disabled attribute:

$(function() {
    $('#id_of_your_checkbox').change(function() {
        if ($(this).is(':checked')) {
            // disable the dropdown:
            $('#id_of_dropdown').attr('disabled', 'disabled');
        } else {
            $('#id_of_dropdown').removeAttr('disabled');
        }
    });
});

Also i want to populate a ‘None’ value as the selected item in dropdownlist

That’s not a pretty common requirement. You will have to add this item manually in front of the IEnumerable<SelectListItem> collection that you are passing as second argument to the DropDownListFor helper.