A port of the tutorial to GopherJS


A port of the tutorial to GopherJS using the go-angularjs wrapper.

This is a minimal fork of the original tutorial and I advice you to work through that one first if you don't know angular yet. My aim was to see how far the angularjs wrapper for gopherjs is. I stripped out all the testing of the tutorial until jet. I also got rid of all the nodejs tools like bower to focus on the gopherjs stuff.

Step 0 - Bootstrapping

Run go get to get the angularjs wrapper code. It also fetches the gopherjs package.

I included public/index.html which is simular to the original app/index.html but I link to CDN hosted versions of angularjs and bootstrap (again, to not use bower).

Run go run server.go and open localhost:3000 with your browser to get started.

It is a minimal http server that hosts the public directory, much like the example in the stdlib http.FileServer.

Step 1 - Static Template

I skipped this, nothing javascript related yet..

Step 2 - Angular Templates

Now the fun begins. The first controller in app/app.go is identical to the one in the original tutorial and is compiled to javascript like this: gopherjs build app/*.go. Which dumps a contollers.js and in the directory you ran the build command in. There is a nicer way to do this:

gopherjs build -w -o public/app.js app/*.go

The -o flag specifies where to write the output to and the -w watches for changes to the input source and rebuilds automatically.

Step 3 - Filtering Repeaters

This makes no changes to the controllers but I included the changes to the HTML for completness.

Step 4 - Two-way Data Binding

The Age field is added to the type Phone of the PhoneListCtrl to demo the orderBy feature of angular.

Step 5 - XHRs & Dependency Injection

Here we inject the HttpService of AngularJS into our controller to request JSON data of the phones, instead of hardcoding them all in our controller.

The wrapped service in go (*ng.HttpService) is pretty cool, in that it does the JSON unmarshall for you, just supply the type of data you expect as the first parameter. []Phone in this case and you are done.

One minor thing I tripped over at first is that you need to supply two arguments to the callback otherwise you get a panic like this: runtime error: index out of range and a callstack in js that is not really pretty... It comes down to this go code. The wrapped http service uses a hardcoded amount of arguments. I opend an pull request with a fix where it checks len(in) and gives you a nicer error if it is to short. My PR landed, you now get a error message, explaining that you need two arguments in the callback.

Step 6 - Templating Links & Images

This just addes some more ng-html markup to display the images of the phones as thumbnails.

Step 7 - Routing & Multiple Views

This step introduces multiple views using the ngRoute module. I took the chance to break out the controllers into named functions. If they grew more they could be moved out to other go files.

The only thing I need to complete this Step is the $routeParams, i need to investigate how the ngRoute module calls the controller. Pull Request #5 adds the missing $routeParams Wrapper.

Step 8 - More Templating

This adds the http request to the PhoneDetailCtrl and extends the template with detailed data.

There is an Issue regarding setting the phone data on $scope. It seems that string slices are somehoe mangled, they come out in go string representation in the templates, which in this case means that angular tries to set the src attribute of the img tags to something like http://localhost:3000/[%22img/phones/dell-streak-7.0.jpg%22,%22img/phones/dell-streak-7.1.jpg%22,%22img/phones/dell-streak-7.2.jpg%22,%22img/phones/dell-streak-7.3.jpg%22,%22img/phones/dell-streak-7.4.jpg%22,%22%22]. I added seperate scopes for these until it is fixed.

Step 9 - Filters

This just adds the Filter Module, basicly the same as in js.

Step 10 - Event Handlers

This just adds a simple ng-click handler to the thumbnails in the detail view to change the big image.


  • [ ] Step 11
  • [x] The gopherjs wrapper seems to miss the angularjs $routeParams
  • [ ] Something is wrong with []string inside structs
  • [ ] RouteProvider doesn't know about redirectTo
  • [x] Open Issue regarding the UTF8 encoding. It's here.
  • [ ] The testing part of the tutorial
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