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HadCoffee will be a mobile web app to help you discover, save and share the best specialty coffee. Launching late 2020 with a Brisbane focus at first.

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Cafe Search Frontend Data Flow

The home screen will let you search for cafes, either by location, or by cafe name (or the combination of the two).

Today I made good progress with the frontend flow of data to support this feature. The app uses Vuex for state storage. This feature has three different Vue components accessing related data to manage the users search.

The quick location search will use the browser geolocation feature as a default, and that data will flow through to the search form via Vuex. If the user is searching for a cafe by name that content will also go through Vuex for global access.

When the search event is triggered the results component can access this state, and send the API request to the server and build out the result set.

The event listening process was a little tricky, as state properties are accessed via getters, and so the normal method of capturing events and passing to component properties won’t work. A combination of Vuex getters, computed properties and watchers lets the result component listen for the search action to do its work.

I can now work on the backend logic for the API endpoint and build out the results data.

I’m a little concerned that that work could get heavy as this is almost a mini-SPA now. Possibly Livewire would have been a good solution, but I’m not going to introduce new architecture at this point in the project development.

I may have to consider how to cache the search result if the user navigates away and comes back. I’d prefer to avoid having to refetch from the server as that delay is annoying when it’s data you have already accessed. Worst case scenario I guess is to capture search criteria in localStorage, and cache the result server side so the response comes in <100ms.

Development Work

Recently:

  • Setup CI / CD process to test and push to a staging server
  • Debugged some JS warnings related to the Vuex state store, and a slightly malformed server response to an API endpoint

Rating by Type of Coffee

Not all cafes will make white, espresso or filter coffees equally, or equally well. Some might have a focus on espresso and bit a little average for the whites, or vice versa. Rather than combining all their ratings and losing that granularity I will let users specify what sort of drink they had when rating a coffee.

screenshot of coffee type UI
WIP UI for selecting drink types

I think this will be important to help give better recommendations. A cafe might do stellar cappuccinos, but if they’re ordinary at a Long Black and that’s what you’re going to order the Cap won’t help you!

The feature does add quite a bit of complexity to the development though. I need to start tracking ratings separately for the drink categories, as well as in aggregate. The scoring algorithm will also ideally weight itself towards a users history and preferences too.

It also has frontend implications with extra UI, state management and icon design requirements. The image above is still, but I am working on building subtly animated SVG icons for the drink types to enhance the UX of choosing them. I’ve got a nice little stepped animation to show the selection action.

SVG

I love the flexibility of images-as-code and being able to add simple animation effects with CSS. I am a little concerned that bundling the SVG icons into Vue components will be adding more weight to the final JS build.

I think referencing a static SVG as an image will prevent me from being able to style and animate individual shapes with CSS. It needs to be an embedded object. When I’m already deep in a Vue component structure that means the icon also needs to be a Vue component (as opposed to server side injected SVG code).

In my defence though, I think most of the audience who are into visiting specialty coffee cafes for entertainment probably err towards having high end phones that are capable of dealing with the load. The JS will be cacheable and probably even service worker cached in the future, so it’s more a CPU/parsing issue.

Backend

Most of the backend adaptations are still to be done though, and the actual search weighting will happen later as I build that feature.

Glad to be Moving to Vuex State Management

The growing amount of data stored for a rated coffee would get difficult to manage within a single parent component. I’m glad I’ve started the work of using Vuex to control the global state. Passing this many props and events up and down the component chain would be quite messy.

Overall Progress

So much of the project framework is complete, but there are a few key features left to build.

  • Drink Type management described here
  • Reverse geocoding and caching so the app can refer to your suburb/city and not just Lat/Long
  • The main cafe search feature, using that geographic information and drink preferences
  • Ability for users to add missing cafes at the time they are entering a review. (This can use some of the existing backend code I have already written from an admin perspective)
  • Service Worker / PWA bundling. This will be very minimal for now. Home screen, and basic asset caching, but no real offline support.
  • Performance and A11Y review

Images

Coded a basic cafe banner image handler today.

  • Resizes to 2000px and 1000px variations
  • Creates WebP version for supporting browsers
  • Had to use GD for that, my install of Imagick didn’t have WebP support
  • File upload is sync, but resizing and cloud upload is Queued job so user doesn’t wait
  • Uploads to S3 and cleans up old file versions

The code that renders the image on the frontend cafe page is suuuper rough. Just gets a random size, rather than using srcset. Sniffs webp support and does cloud disk access right in the view. Definitely needs tidying up, still a good start though.

Sourcing 2000px images (wide on retina) might be difficult. A lot of photos on the web seem to be lower quality. Might have to ask users or cafes to submit a quality one!

Is it an App?

I’m trying to hold back on the scope creep and I’d planned not to PWA this thing, but so many people are asking if it’s a real app, or just a website.

Maybe it would be worth doing a 101 PWA with caching of the assets & home screen icon. Unless I do a lot more work none of the features would work offline though.

I’m not sure if that’s pointless, having an online-only PWA, or if in reality most users are online and they just need an icon launcher, fast loading, and no URL bar.

Maybe I’ll do that. If you’re offline I might be able to cache a list of Fav/To Try and at least render those?

Backend Work

I have made progress recently, but mostly on backend processes that I don’t think are super interesting to read about, and certainly not very visual. Stay tuned (if you want).

Dev Stats

JS not included. What’s a good package to count that?

Project code stats
763 “Code” LOC, 79 classes, 161 methods. Where’s my JS though?

Ratings, Favourites, A11Y, SVG & Lists

I made a nice chunk of progress on the ‘To Try’ feature of HadCoffee this weekend. This lets you bookmark cafés you’ve heard of and would like to try later. By default the list on HadCoffee will sort by proximity using your current location.

Screenshot of list of cafes to try
The list, sorted by proximity taking into account that some cafes have multiple locations. The coffee cup icon shows the cafe’s rating, and the star toggles it on your Favourites list.

Most of the recent work for this feature was on some nice-to-use buttons for toggling a cafe in your Favourites or To Try list. I had mostly built the ‘Fav star’ earlier, but improved it with a visual :focus indicator for keyboard accessibility.

See the Pen SVG Favourite by Mike (@mike_hasarms) on CodePen.0

The coffee cup icons are SVG based Vue components that receive rating data from the page and fill the cup appropriately.

I also worked on some basic animation of the button to add a cafe to the To Try list to make the transition to the active state a bit more obvious. I think little touches of movement make the thing more engaging to use as well.

screenshot of cafe action buttons
You can’t see it, but the last item on the ‘list’ animates in when clicked.

Accessibility

I spent a bit of time improving the A11Y of these (and other features). The Vue SVG components are keyboard accessible, labelled and indicate focus. I am planning to do a more thorough A11Y test before I release, but I’m certainly not leaving all of those concerns until the end of development.

Anonymous Users

Currently the Favourites and To Try lists require a user to be logged in. I had planned to allow anonymous users to begin keeping these lists for themselves in localStorage. The idea was to lower the barrier to entry to using the site. It does however add development complexity as the app needs to be able to use both local and server storage for those lists and load in data in different ways.

As this is a mostly server-rendered app all the initial page data is sent down with the page load, and populated into the Vue components. Supporting anon users will require separate logic to request their cafe data from an API endpoint.

That’s not hugely difficult, it’s just another thing to be done before launch.