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elmlang | general | Would be nice to know what the rest of the elm community thinks about fragments, but it seems no one is losing any sleep over that. | 2019-04-06T22:59:09.680500 | Maxwell |
elmlang | general | I don’t see the usefulness | 2019-04-06T23:10:28.680900 | Kris |
elmlang | general | If you need non-encapsulated lists in a keyed list, you can do that. Write a function `List (String, List (Html msg)) -> List (String, Html msg)`
the only use i see right now is for definition lists, though doing that without this function doesn’t seem much harder and the keys would make more sense.
My view on this right now is that it’s a nice trick for the react Dom to have, but I don’t think it’s necessary in Elm | 2019-04-07T01:30:48.685600 | Emilee |
elmlang | general | It makes a lot more sense for React because of the focus on 'components'. Fragments give you the ability to have a list of elements as a single component which lets your list use all the features that React components have. For Elm all you'd be getting is the ability to hide that it's a list. | 2019-04-07T01:43:29.687500 | Earlean |
elmlang | general | If such a thing did exist it would probably be called `Html.batch` as it does the same thing that `Cmd.batch` and `Sub.batch` do | 2019-04-07T01:44:57.688300 | Earlean |
elmlang | general | Thanks, <@Earlean>, that makes sense. | 2019-04-07T02:03:11.688700 | Maxwell |
elmlang | general | I have an issue with a `select` element, where it's using the first option from the list as value rather than the value in my model. | 2019-04-07T02:05:28.691000 | Maxwell |
elmlang | general | <https://ellie-app.com/5bWFYzmFShya1> | 2019-04-07T02:05:29.691100 | Maxwell |
elmlang | general | Did I do something wrong? The displayed text _is_ using the value from the model, so why isn't the `select` also? | 2019-04-07T02:11:58.692200 | Maxwell |
elmlang | general | <@Maxwell> that’s not how select works. you need to set the `selected` attribute on the selected option: <https://ellie-app.com/5bWQB3xPmmMa1> | 2019-04-07T02:18:06.692900 | Maida |
elmlang | general | Thanks, Peter. :100: | 2019-04-07T02:21:16.694000 | Maxwell |
elmlang | general | Do you know if Elm supports a select's element `multiple` attribute? It will cost me a bit of time to come up with an example for that so I'm asking in advance. | 2019-04-07T02:29:00.694800 | Maxwell |
elmlang | general | <https://package.elm-lang.org/packages/elm/html/latest/Html-Attributes#multiple> | 2019-04-07T03:26:29.695000 | Emilee |
elmlang | general | Generally, elms vdom supports arbitrary attributes via <https://package.elm-lang.org/packages/elm/html/latest/Html-Attributes#attribute> and even properties (like JavaScripts `myEl.someProp = ...` via <https://package.elm-lang.org/packages/elm/html/latest/Html-Attributes#property>
The latter is mainly useful for custom elements | 2019-04-07T03:28:39.695100 | Emilee |
elmlang | general | <@Maxwell> just pinging so you see this since my answer took quite a while :) | 2019-04-07T03:31:26.696500 | Emilee |
elmlang | general | Hello there! Someone advertised here a tool that was able to download elm docs for a project so that they are available offline. I can’t remember the name of this tool. Does anyone know what tool I’m talking about? | 2019-04-07T03:57:11.699200 | Concetta |
elmlang | general | <@Concetta> do you mean <https://www.npmjs.com/package/elm-doc-preview> | 2019-04-07T03:58:17.699500 | Earlean |
elmlang | general | great, thank you! | 2019-04-07T04:03:27.699800 | Concetta |
elmlang | general | You can definitely get it as a JSON value but you'd probably have to stop using the elm/file package and write your own stuff instead.
You'd create a file input element and use the `on` function from Html.Events to detect when a file is selected. `on` allows you to use a custom decoder on the JS event object. If just decode it to a `Json.Decode.Value` instead of a 'real' Elm type, you can pass that directly through a port.
So your custom decoder would be something like:
`<http://Json.Decode.at|Json.Decode.at> ["target", "files"] Json.Decode.value` | 2019-04-07T05:09:05.700000 | Ashlie |
elmlang | general | Anyone else feel that the new Http library (2.x) makes working with Http Tasks disproportionately hard - I feel like I am reimplementing almost all of the `Response -> Error` code because it is not exposed | 2019-04-07T06:01:29.701700 | Lynn |
elmlang | general | Never used it myself but you might like <https://package.elm-lang.org/packages/jinjor/elm-req/latest/> | 2019-04-07T06:24:38.701900 | Lea |
elmlang | general | We updates to http 2.x a while ago and we have not had any issues. Our back end systems send a common error format and we wrote a custom `Response -> OurAppError` function that knows how to deal with status codes and response body such that we can bubble meaningful errors to our applications.
So yeah, we did need to write a custom error function, but I'd expect that eventually most apps would like to map errors into a type that is clear. | 2019-04-07T12:08:33.703000 | Charity |
elmlang | general | For example, it is helpful to know when a session expired vs getting an opaque 401 or 403 status and needing to figure it out.
Our servers send a correct status code and context in the body of the reponse which allow us to map it into an Error type which we can use to dispatch a Cmd. | 2019-04-07T12:11:26.703200 | Charity |
elmlang | general | I'm making some assumptions the issue here so hopefully this was helpful. :slightly_smiling_face: | 2019-04-07T12:13:10.703400 | Charity |
elmlang | general | thanks, that's an interesting observation | 2019-04-07T12:14:33.703600 | Lynn |
elmlang | general | What are you doing in the code inside of the port? I had a situation that was really easy to fix that might be the same thing. | 2019-04-07T12:16:03.703800 | Charity |
elmlang | general | what led to my question was the docs for Http.task “Just like request, but it creates a Task. This makes it possible to pair your HTTP request with Time.now if you need timestamps for some reason. This should be quite rare.” | 2019-04-07T12:18:31.704000 | Lynn |
elmlang | general | that felt like a rather narrow vision and what e.g. <@Charity> describes is a totally different reason for using task | 2019-04-07T12:19:17.704200 | Lynn |
elmlang | general | and then there is the simple desire to compose http requests, which was my main interest initially | 2019-04-07T12:19:47.704400 | Lynn |
elmlang | general | when you compose them, what is the use case?
Are you trying to run 2 things at a time or run things sequentially (e.g. get the time, then use the value of time to make an http req?) | 2019-04-07T12:20:36.704700 | Charity |
elmlang | general | no, mostly to create ‘joined’ data in a nosql database | 2019-04-07T12:21:10.705000 | Lynn |
elmlang | general | how does an Elm task help write a relationship to a db? (I apologize for not understanding :disappointed: ) | 2019-04-07T12:21:51.705200 | Charity |
elmlang | general | save on thing, and use the id returned to create the object that links to it. Doing that in one go rather than passing via the update function in between | 2019-04-07T12:22:38.705500 | Lynn |
elmlang | general | Ok.. so something like this?
open a db transaction
write something
update something
updatea something else
commit transaction | 2019-04-07T12:24:05.705700 | Charity |
elmlang | general | then if something in the task fails, rollback transaction | 2019-04-07T12:24:54.705900 | Charity |
elmlang | general | yes | 2019-04-07T12:26:05.706100 | Lynn |
elmlang | general | Aha.. my first thought is to put that transaction behind a single server endpoint. | 2019-04-07T12:36:41.706400 | Charity |
elmlang | general | I see what you are saying now. I've always pushed batches of operations to a new endpoint so unfortunately, I don't have much insight on what you are doing. | 2019-04-07T12:39:41.706600 | Charity |
elmlang | general | In our stack, we have the luxury of spinning up new API endpoints for batch operations on a DB. I know a lot of folks don't have this luxury. | 2019-04-07T12:41:20.706800 | Charity |
elmlang | general | for good or for bad, we currently put the balance of the DB organisation on the client side | 2019-04-07T12:41:34.707000 | Lynn |
elmlang | general | not sure where I should post this, but I'm facing a rather odd issue: <https://ellie-app.com/5c8kffC7j2fa1> | 2019-04-07T12:43:43.707600 | Krista |
elmlang | general | as you can see in this ellie, having a non breaking space in the wrong place (namely, inside a tag, where it shouldn't be) raises the error `InvalidCharacterError: String contains an invalid character` | 2019-04-07T12:44:44.707700 | Krista |
elmlang | general | having this error isn't the issue I'm facing, but rather the fact that *in my application* (a RSS reader) this causes an infinite "loop" : the application kinda "reloads" the content over and over, and ends up with an error somewhere in the virtualdom. So my real issue is that there's this infinite loop that brings my browser (and my CPU) to its knees. | 2019-04-07T12:46:29.707900 | Krista |
elmlang | general | any idea how I could investigate that, or maybe an idea of what could be causing the issue ? | 2019-04-07T12:47:49.708100 | Krista |
elmlang | general | Starting up a debugger seems to be a reasonable idea | 2019-04-07T13:02:57.708300 | Florencia |
elmlang | general | We discussed doing this but the overhead of writing my own elm/file was too much.
Honestly, being able to alias two versions of Elm/http would be ideal. | 2019-04-07T13:55:56.710200 | Cammy |
elmlang | general | Is there a chart somewhere with the big O performance of data structures in Elm? (If not, does anyone know what the big O is for appending an array to another array?) | 2019-04-07T14:38:56.711400 | Jae |
elmlang | general | It might be fastest to ask <@Patricia> | 2019-04-07T14:40:28.711500 | Florencia |
elmlang | general | I think there were some blogposts with performance but I don't know how much the implementation in elm/core has deviated from the original exploration repo | 2019-04-07T14:40:50.711700 | Florencia |
elmlang | general | I take it Robin is the person who implemented HAMT arrays in Elm? | 2019-04-07T14:41:25.712800 | Jae |
elmlang | general | It’s O(m) (m being nr of elements in the other Array, although that might change in the not too distant future) | 2019-04-07T14:41:40.713400 | Patricia |
elmlang | general | Thanks! | 2019-04-07T14:41:49.713600 | Jae |
elmlang | general | (And yes, I implemented the thing :) | 2019-04-07T14:42:06.714200 | Patricia |
elmlang | general | That tells me that there is a bug, and why, but sadly not why it results in a loop, which is my real issue here :/ | 2019-04-07T17:31:29.714800 | Krista |
elmlang | general | I’m wondering if there’s a comparison table for syntax and features between Elm and Typescript. I know there’s one for javascript that ~I can’t locate at the moment~. I plan to make one, but wondering if it already exists in some form. | 2019-04-07T20:09:04.716600 | Rheba |
elmlang | general | Like this: <https://elm-lang.org/docs/from-javascript>, but for typescript. | 2019-04-07T20:10:03.716700 | Rheba |
elmlang | general | That table lacks the feature comparison you're looking for. | 2019-04-08T01:44:15.717300 | Niesha |
elmlang | general | The main difference between Elm and Typescript is that Elm is pure and is a change of paradigm, whereas Typescript wants to encode the things JS is doing in a type system. | 2019-04-08T01:45:09.717500 | Niesha |
elmlang | general | I want to use highlight. JS highlight code, but when my page uses post request again to add content to the tag, the newly acquired content can't highlight, how can I solve it? | 2019-04-08T02:26:50.720000 | Carrie |
elmlang | general | I use "hljs.init Highlighting OnLoad ();" in the elm compiled HTML file, but before the post request, my page status is onload, highlight.js cannot render the newly acquired content. | 2019-04-08T02:36:50.720600 | Carrie |
elmlang | general | Using HLJS on content that's rendered by Elm is not great, since HLJS will change the DOM structure, making Elm's virtual-dom confused about the elements on the page. Maybe there's a custom element that incorporates highlighting for its contents? | 2019-04-08T03:07:39.721200 | Bert |
elmlang | general | Oh, I misunderstood you. I thought you wanted to debug the crash in the library, not the loop in your app. Sorry | 2019-04-08T03:09:06.721300 | Florencia |
elmlang | general | <https://github.com/elm/package.elm-lang.org> could see how elm does it, afaik the package website uses hljs too | 2019-04-08T03:26:49.722400 | Danika |
elmlang | general | I will try to find it. Thanks very much | 2019-04-08T03:45:40.722600 | Carrie |
elmlang | general | isn't TypeScript identical to JavaScript though? besides the type declarations | 2019-04-08T04:29:09.722700 | Nana |
elmlang | general | I suppose you could make a comparison between Elm's and TypeScript's type declaration, that could be useful | 2019-04-08T04:30:38.722900 | Nana |
elmlang | general | How to extract the response body from a status code 422 response in elm 0.19? In my case it includes important information what went wrong on the server (eg validation errors, like not unique email address on signup). But I can only extract the status code itself but nothing else from `BadStatus`. | 2019-04-08T08:44:02.726600 | Elisabeth |
elmlang | general | By defining this <https://package.elm-lang.org/packages/elm/http/latest/Http#expectStringResponse> | 2019-04-08T08:47:38.726900 | Lea |
elmlang | general | Assuming you mean Http 2.0.0 | 2019-04-08T08:48:15.727100 | Lea |
elmlang | general | <https://package.elm-lang.org/packages/jinjor/elm-req/latest/> could also be of help. | 2019-04-08T08:48:26.727300 | Jin |
elmlang | general | yes 2.0.0; Thanks for your quick reply! | 2019-04-08T08:52:09.727700 | Elisabeth |
elmlang | general | I kind of wish the error response would be returned as a `Value` or `String` by default :thinking_face: having to use `expectStringResponse` takes a lot of boilerplate, and isn't super simple for beginners | 2019-04-08T09:07:26.728000 | Nana |
elmlang | general | I guess it encourages defining you own error type | 2019-04-08T09:24:23.728400 | Lea |
elmlang | general | IMHO, the built in error type is sufficient for beginners. The ability to make a custom error type is great b/c everyone's upstream server sends down different things. Getting the custom error type and the abstraction defined early in a project will help for the life of the project.
We did it in the middle/late phase of one project and we had to change a lot of code... The compiler helped, but it was still a bunch of work that could have been avoided. | 2019-04-08T09:38:20.728600 | Charity |
elmlang | general | <@Elisabeth> - here is a gist that shows how you can decode a response to whatever you like. I took this from one of our production apps. I hope this helps.
<https://gist.github.com/doanythingfordethklok/8b244264f4f5b7e999f4495c61053f15> | 2019-04-08T09:46:35.728800 | Charity |
elmlang | general | But it's kind of redundant to define your own `Error` type and create all the boilerplate, when typically the only difference is that you want to change `BadStatus Int` to `BadStatus CustomResponse` | 2019-04-08T09:46:36.729000 | Nana |
elmlang | general | which I'm guessing is why you didn't get around to it until later in the project | 2019-04-08T09:47:16.729200 | Nana |
elmlang | general | we didn't get around it until later in the project b/c we were working on our product and kicked bubbling friendly errors until the end of the project | 2019-04-08T09:48:10.729400 | Charity |
elmlang | general | the part is that http 2.0 came out in the middle of the project.. | 2019-04-08T09:49:09.729600 | Charity |
elmlang | general | I dont see much boilerplate. I see 1 type and 2 functions... and those things do exactly what my app needs them to do. | 2019-04-08T09:50:50.729800 | Charity |
elmlang | general | hmm, am I missing something here? as far as I can tell the object contains a field named uri? | 2019-04-08T09:58:11.730200 | Emilee |
elmlang | general | nevermind, apparently it was immutablejs, and because the toString is overridden you can't discern the two...^^ | 2019-04-08T10:01:24.731000 | Emilee |
elmlang | general | made a package for exactly this and more: <https://package.elm-lang.org/packages/jzxhuang/http-extras/latest/Http-Detailed>
Found that we had to do the same thing in every project so made the boilerplate code into a package, if you only need to do it once or twice it's may be better to just use `expectStringResponse` to handle it yourself as explained above :hugging_face: | 2019-04-08T10:16:23.731200 | Glenda |
elmlang | general | Hello! Does anyone have an idea why when I call `Browser.Navigation.Back`, `onUrlChange` is called twice, and feed first the current url and then the url I want to go back to? | 2019-04-08T11:24:42.733300 | Donya |
elmlang | general | <@Donya> I know there is some weird Chrome bug with popstate, is it happening in every browser for you? | 2019-04-08T11:31:49.735000 | Brady |
elmlang | general | i havent yet checked it in firefox | 2019-04-08T11:33:38.735300 | Donya |
elmlang | general | <@Brady> One minute... | 2019-04-08T11:33:50.735800 | Donya |
elmlang | general | <@Brady> Woah! It works in firefox | 2019-04-08T11:34:31.736100 | Donya |
elmlang | general | @ I apparently only have the problem in chrome | 2019-04-08T11:34:47.736400 | Donya |
elmlang | general | <@Brady> Is this a known issue? I've been tearing my hair out for the two hours trying to debug it :yum: | 2019-04-08T11:35:47.737300 | Donya |
elmlang | general | chrome bug is known issue, to avoid that issue we are storing url in our model, then `onUrlChange` we compare new url with the url in the model | 2019-04-08T11:41:50.739300 | Brady |
elmlang | general | got it. thanks so much for the help | 2019-04-08T11:43:20.739500 | Donya |
elmlang | general | Are there any recent benchmarks of Elm and overall performance comparison to other libraries like React? I'm looking into using Elm for a performance critical project and I want to gather some data first. | 2019-04-08T14:15:43.740600 | Dayna |
elmlang | general | What kind of metrics are you looking for? And what is the nature of the project? | 2019-04-08T14:20:39.740700 | Timika |
elmlang | general | There is this older blogpost by Evan about the VDOM performance: <https://elm-lang.org/blog/blazing-fast-html-round-two> | 2019-04-08T14:21:09.740900 | Timika |
elmlang | general | That is from way back in 2016, Elm has changed a lot since then. The nature of the project is a website where people will be betting on live events, imagine a lot of odds updating in real time and input latency is crucial, you don't want people to get upset because they missed their bet, especially on low-powered mobile devices. | 2019-04-08T14:23:10.741200 | Dayna |
elmlang | general | <https://krausest.github.io/js-framework-benchmark/current.html> | 2019-04-08T14:24:32.741400 | Lea |
elmlang | general | That’s very interesting. Especially the direct comparison between Elm and React there. | 2019-04-08T14:29:20.741700 | Timika |
elmlang | general | <https://medium.freecodecamp.org/a-realworld-comparison-of-front-end-frameworks-with-benchmarks-2019-update-4be0d3c78075> | 2019-04-08T14:32:01.742000 | Dayna |
elmlang | general | Indeed, I’m curious to see how much faster Elm can get over time | 2019-04-08T14:32:07.742300 | Lea |
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