Javascript pattern: Conditional event handler

Question

Given e.g. a class instance of some sort has a state (e.g. \'active\', \'inactive\', …). The instance also attaches a click event to e.g. a link but the event handler does somet

Answer 1

I would keep the same handler and call the appropriate method within.

var Foo = (function(){

    function Foo() {

        this.state = 'active';

    }

    Foo.methodMapping = {
        active: 'a',
        inactive: 'b'
    };

    Foo.prototype = {

        a: function(){}.
        b: function(){},

        handler: function(el) {

            // This'll handle the event, I guess
            // (Assuming `this` refers to instance, not element)

            var state = this.state;
            if (state in Foo.methodMapping) {
                return this[Foo.methodMapping[state]].apply(this, arguments);
            } else {
                // (prob don't need to cover this case)
            }

        }

    };

    return Foo;

}());