如何在MVC 5 SPA模板中使用历史记录进行导航？

Question

I am struggling with the navigation in the VS2013 SPA MVC-5 template. I made 2 assumptions (because I couldn't find good references), but it seems I am wrong or it is just not working well:

• It thought that the navigation was be based on the typical spa # url encoding , for example to navigate to the users account management page directly one should be able to use: http://localhost:18759/#/manage

• I also thought that, when navigating across the website (single page) I thought that these # url's where formed by the default knockout.js files, which are included in the template. Combined with the previous assumption this would result in a proper history build-up.

http://localhost:18759/#/manage does not seems to navigate to the manage page (other # url's doesn't work either) .

I noticed some that some frameworks are available to handle this ( navrouter and sammy.js ) but as far as I can tell it takes quite some effort to implement them, especially if it's already in place in the template.

As for the reasons why I made these assumptions, there is an article here , which suggests this is in place due to this part:

// app.viewmodel.js - there is a method called "addViewModel()
if (typeof (options.navigatorFactory) !== "undefined") {
        navigator = options.navigatorFactory(self, dataModel);
    } else {
        //suggests "#"-hash navigation
        navigator = function () {
            window.location.hash = options.bindingMemberName;
        };
    } 

But in my own app.viewmodel.js these lines are without reference to the hash at all:

if (typeof (options.navigatorFactory) !== "undefined") {
        navigator = options.navigatorFactory(self, dataModel);
    } else {
        navigator = function () {
            self.errors.removeAll();
            self.view(viewItem);
        };
    }

There is a reference to the hash in app.viewmodel.js here, but this doesn't seem to handle the navigation:

// Private operations
function cleanUpLocation() {
    window.location.hash = "";

    if (typeof (history.pushState) !== "undefined") {
        history.pushState("", document.title, location.pathname);
    }
}

function getFragment() {
    if (window.location.hash.indexOf("#") === 0) {
        return parseQueryString(window.location.hash.substr(1));
    } else {
        return {};
    }
}

My code to navigate looks like this:

<ul class="nav navbar-nav navbar-right">
     <li data-bind="with: user"><a href="#" data-bind="click: manage">manage</a></li>
</ul>

and the navigation factory is pretty default like:

app.addViewModel({
    name: "Manage",
    bindingMemberName: "manage",
    factory: ManageViewModel,
    navigatorFactory: function (app) {
        return function (externalAccessToken, externalError) {
            app.errors.removeAll();
            app.view(app.Views.Manage);

            if (typeof (externalAccessToken) !== "undefined" || 
                typeof (externalError) !== "undefined") {
                   app.manage().addExternalLogin(externalAccessToken, externalError);
            } else {
                app.manage().load();
            };
        }
    }
});

question(s)

• Should this be working? If so, how can I fix it?
• Or do I need extra components like sammy.js or navrouter ?

Answer 1

After a day of struggling I came to the following conclusion:

• the # navigation doesn't seem present in the default VS2013 MVC 5 SPA template .

I managed to get it working, so I'll sum up the implementation method here.

Although pagerjs , suggested by Paul Manzotti, does the job pretty well, I have chosen to use sammy.js to perform the navigation. Other navigation frameworks should work just as well.

So the first step is to get it from nuget :

install-package sammy.js

After the installation of sammy.js we need to alter the default VS2013 MVC 5 SPA template 's javascript files. I'll sum it up:

First enable sammy.js . There are various options of where to put the code, but since I want to use it throughout the entire application I putted it in: ~/Scripts/app/_run.js like this:

//_run.js
$(function () {
    app.initialize();

    // Activate Knockout
    ko.validation.init({ grouping: { observable: false } });
    ko.applyBindings(app);

    //provides basic '#' navigation
    //run this function after the initialization of the
    //default knockout code.
    Sammy(function () {
        //"#:view" is the parameter's name of the data after the hash tag 
        //it is stored in "this.params.view"
        this.get('#:view', function () {
            //call the navigation functions
            //these are created in the default knockout initiallization
            app["_navigateTo" + this.params.view]();
        });
    }).run("#Home");//Specify the starting page of your application
 });

Next, I wanted the # navigation to work "out of the box". A crucial part is that on navigation the # parameter is added to the url So I needed to hook in the navigateTo functions. There is a way in ~/Scripts/app/app.viewmodel.js :

Change:

//app.viewmodel.js
...
// Add navigation member to AppViewModel (for example, app.NavigateToHome());
self["navigateTo" + options.name] = navigator;

To:

//app.viewmodel.js
...
// Add navigation member to AppViewModel (for example, app.NavigateToHome());
// Override default routing to just set the hash
self["navigateTo" + options.name] = function() {
            window.location.hash = options.name;
    };

    //this one is used by sammy to perform actual default routing
    self["_navigateTo" + options.name] = function() {
        navigator();
    };

A final detail has to be fixed, and that is when a user refreshes it's page, the default route will go to #Home . This is due to the following code in ~/Scripts/app/app.viewmodel.js :

//app.viewmodel.js
...
self.navigateToLoggedIn = function (userName, accessToken, persistent) {
    self.errors.removeAll();

    if (accessToken) {
        dataModel.setAccessToken(accessToken, persistent)
    }

    self.user(new UserInfoViewModel(self, userName, dataModel));

    //this line only routes to "#Home" when navigation
    //after the login... or register, or something else        
    if (window.location.hash === "#Login" || window.location.hash === "#Register")
        self.navigateToHome();
};

So add the proper if statement to this code and the # is in place.

The proper url to access the manage page will be:

http://localhost:18759/#Manage

I must say, I haven't had time to give it a proper review (the # url encoding might be used elsewhere and may cause collisions). I will update this post if I find some issues.

Another point: of course there are various alternatives in the way to hook into the routing. I have chosen these steps because they work in the case I am working on.