knockout js pass parameter in knockout data binding using knockout safe binding

The documentation for ksb says (note #3 in particular , in bold):

The language used in KSB in the bindings is a superset of JSON, but a subset of Javascript. For convenience, I'll call it slang.

The binding language is closer to JSON than the Java language, so it is easier to describe its differences by comparing it to JSON. The binding language differs from JSON in the following ways:

1. it understands undefinedkeywords;
2. It looks for variables on $dataor $contextor globals (in that order);
3. Functions can be called ( but take no arguments );
4. The top-level function is called to thisset an object with the following keys: $data, $context, a global variable, $elementcorresponding to the state used to bind the corresponding element.

To work around this limitation, you can use custom binding handlers that wrap other custom binding handlers and provide binding functions for them.

ko.bindingHandlers.curry = {
    unwrap: function (valueAccessor, data) {
        var val = valueAccessor(),
            theFunction = data[val[1].token];
        return {
            bh: ko.bindingHandlers[val[0]],
            fnVa: function () {
                return theFunction.apply.bind(theFunction, theFunction, val.slice(2));
            }
        };
    },
    init: function (element, valueAccessor, allBindingsAccessor, data, context) {
        var spec = ko.bindingHandlers.curry.unwrap(valueAccessor, data),
            init = spec.bh.init;
        if (init) {
            init(element, spec.fnVa, allBindingsAccessor, data, context);
        }
    },
    update: function (element, valueAccessor, allBindingsAccessor, data, context) {
        var spec = ko.bindingHandlers.curry.unwrap(valueAccessor, data),
            update = spec.bh.update;
        if (update) {
            update(element, spec.fnVa, allBindingsAccessor, data, context);
        }
    }
};

Use it like this:

<button type="button" data-bind="curry:['click', btnClick, '1', '2']">short</button>

Demonstration violin .