<a data-bind="attr: { href: myUrl }">link with dynamic href</a>

ko.applyBindings({
  myUrl: ko.observable("http://www.stackoverflow.com")
});

Since there is no native href binding in KnockoutJS, you need to use a different feature to get dynamic links. The above example showcases the built-in attr binding to get a dynamic link.

href binding is not native to KnockoutJS, so to get dynamic links use a custom binding handler:

<a data-bind="href: myUrl">link with dynamic href</a>

ko.bindingHandlers['href'] = {
  update: function(element, valueAccessor) {
    element.href = ko.utils.unwrapObservable(valueAccessor());
  }
};