ko-holdClick.js

ko.bindingHandlers.holdClick = {
    init: function (element, valueAccessor, allBindings, viewModel, bindingContext) {
        var timeoutId = 0;

        var option = valueAccessor() || {};

        $(element).mousedown(function () {
            timeoutId = setTimeout(option, 1000);
        }).bind('mouseup mouseleave', function () {
            clearTimeout(timeoutId);
        });
    },
};