How to pass a parameter to a computed function in Knockout?

Question

This is actually a continuation of this question that I asked earlier.

I needed to pass an element to a function to check if one of its children had a checked checkbox, and I got that working (described in the question above), but the answer given does not make any allowances for the checkbox to be observed. How would I go about detecting a change in a child element when my Knockout Binding is on a parent?

I cannot pass a parameter to ko.computed as I am told:

Cannot write a value to a ko.computed unless you specify a 'write' option

Any ideas?

Answer 1

Please check the writable computed article:

var _innerValue = 0;
var computedValue = ko.computed({
        read: function() {
            // you can put here some additional logic
            return _innerValue;
        },
        write: function(newValue) {
            // you can put here some additional logic
            _innerValue = newValue;
        }
    });

If you don't need any specific logic, you can use simple ko.observable .