How do I check if any checkboxes at all on the page are checked?

Question

I need to check, using jQuery, if any checkboxes on the page are checked. The particular checkbox set they are contained in doesn't matter, just any of them.

Any ideas?

Thanks!

Answer 1

var isChecked = $("input[type=checkbox]").is(":checked");

or

var isChecked = $('input:checkbox').is(':checked')

Answer 2

The following function returns true if there are any ticked checkboxes and false otherwise.

function anyCheckbox()
{
    var inputElements = document.getElementsByTagName("input");
    for (var i = 0; i < inputElements.length; i++)
        if (inputElements[i].type == "checkbox")
            if (inputElements[i].checked)
                return true;
    return false;
}