Disable button if all checkboxes are unchecked and enable it if at least one is checked

Question

I have a table with a checkbox in each row and a button below it. I want to disable the button if at least one checkbox is checked.

Answer 1

Try this:

var checkBoxes = $('tbody .myCheckBox');
checkBoxes.change(function () {
    $('#confirmButton').prop('disabled', checkBoxes.filter(':checked').length < 1);
});
checkBoxes.change(); // or add disabled="true" in the HTML

Demo

Explanation, to what I changed:

• Cached the checkbox element list/array to make it a bit faster: var checkBoxes = $('tbody .myCheckBox');
• removed the if/else statement and used prop() to change between disable= true/false.
• filtered the cached variable/array checkBoxes using filter() so it will only keep the checkboxes that are checked/selected.
• inside the second parameter of prop added a condition that will give true when there is more than one checked checkbox, or false if the condition is not met.