How to handle / ignore a bad route with durandal?

Question

I\'m trying to conditionally block a route from being accessed. I think this can be done with guardRoute: http://durandaljs.com/documentation/Router/

Answer 1

You should use guardRoute before activating the router e.g. in shell.js. The example is taken from a Durandal 2.0 alpha site. AFAIK guardRoute hasn't changed from 1.2, but setting a breakpoint will allow you to figure out what arguments are passed in for 1.2. As a general rule, return true to allow navigation, false to prevent it and a hash or url value to redirect.

define(['plugins/router'], function (router) {

    // Redirecting from / to first route in route.map
    router.guardRoute = function(routeInfo, params, instance){
        if (params.fragment === ''){
            return routeInfo.router.routes[0].hash;
        }
        return true;
    };
    ...    

    return {
        ...
        router: router,
        activate: function () {
            router.map([
               ---
            ]);

            return router.activate();
        }
    };
});