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elmlang | general | I honestly don't care about any of the intermediate responses, just the last one in the queue. Alternately, I can just fire off all the original requests, ignoring their bodies, and just do a new GET at the end to get fresh data. But that still means being able to guarantee that the GET happens after all the others. | 2019-04-05T09:17:28.528900 | Gertrude |
elmlang | general | Hence why you could/should? chain the queries as tasks imo. | 2019-04-05T09:18:54.530500 | Antonette |
elmlang | general | Yeah. Are Tasks deterministic then? I see there is a `Task.sequence` at least | 2019-04-05T09:19:20.531700 | Gertrude |
elmlang | general | You'd be guaranteed to send them sequentially and to get a `Msg` only at the very end. | 2019-04-05T09:19:40.532400 | Antonette |
elmlang | general | And yes, they are :) that's why `Cmd`s are not. | 2019-04-05T09:20:07.533200 | Antonette |
elmlang | general | You can see `Cmd`s as a way to "wrap" `Task`s in a non-sequencial batch, and of not caring about success/failure when you don't want to. | 2019-04-05T09:21:32.535700 | Antonette |
elmlang | general | > Start with a list of tasks, and turn them into a single task that returns a list. The tasks will be run in order one-by-one and if any task fails the whole sequence fails.
Hmmm. That could be messy. If one of the requests fails that could leave me with half the batch undone? Also there seems to be no `jsonResolver` for HTTP tasks. | 2019-04-05T09:21:57.536400 | Gertrude |
elmlang | general | How do you currently handle batch failure? | 2019-04-05T09:23:57.539000 | Carman |
elmlang | general | Good point. It kinda ... doesn't yet. | 2019-04-05T09:24:30.539400 | Gertrude |
elmlang | general | I think this may be the point where it is just more sane to update the API. | 2019-04-05T09:25:15.540100 | Gertrude |
elmlang | general | Sounds like the better course of action to me (if you may). | 2019-04-05T09:25:56.541000 | Antonette |
elmlang | general | yeah, I'll have to see. The immediate endpoint is hours, but that's basically just a proxy for a third-party API | 2019-04-05T09:33:08.541700 | Gertrude |
elmlang | general | It needs to be a function to allow it to sync. The version I posted of my model features a solution that does sync. It's just ugly. | 2019-04-05T09:34:55.541800 | Willodean |
elmlang | general | I guess I don't understand how something goes out of sync in elm. The view should always reflect the current state of the model, no? | 2019-04-05T09:39:59.542300 | Sharon |
elmlang | general | hmm, should i decode stuff from javascript in the subscription function or in the update function? | 2019-04-05T09:39:59.542500 | Emilee |
elmlang | general | IMO as soon as possible. | 2019-04-05T09:40:19.542800 | Timika |
elmlang | general | <@Emilee> keep decoders as far away from your code as you can. :slightly_smiling_face: This means, as close to the edges of your app. | 2019-04-05T09:41:41.543500 | Maida |
elmlang | general | I prefer to interact with a module that handles every interaction with the server and is called from inside of the app with all the arguments needed to be able to reply with a `Cmd msg`. | 2019-04-05T09:43:25.545000 | Maida |
elmlang | general | This means that, in your context, I will always decode at the subscription. | 2019-04-05T09:43:56.545600 | Maida |
elmlang | general | that's fair | 2019-04-05T09:44:18.545900 | Emilee |
elmlang | general | How do people handle the (incredibly common) scenario where you have several form fields which all need to hold valid values before the form can be submitted (or the submit button enabled)?
I used to do something like this
```
case (field1, field2, field3, field4) of
(Just v1, Just v2, Just v3, Just v4) -> Just (submit v1 v2 v3 v4)
_ -> Nothing
```
but obviously that doesn’t work in Elm 0.19 | 2019-04-05T09:47:09.548900 | Felisa |
elmlang | general | <@Felisa> have some kind of validation | 2019-04-05T09:47:54.549300 | Maida |
elmlang | general | you can use something like `elm-validate` | 2019-04-05T09:48:34.549900 | Maida |
elmlang | general | Just a big stack of nested `if` statements then? | 2019-04-05T09:48:34.550000 | Felisa |
elmlang | general | Sorry if I wasn’t clear: I’m not asking how do you validate a single field, I’m asking about how you organise multiple validations now that tuples are limited to 3 elements | 2019-04-05T09:49:34.551200 | Felisa |
elmlang | general | `elm-validate` helps with that | 2019-04-05T09:51:10.551700 | Maida |
elmlang | general | if you don’t want to use a library, take a look at `elm-spa-example` to see how you can easily implement a validation:
<https://github.com/rtfeldman/elm-spa-example/blob/master/src/Page/Settings.elm#L356> | 2019-04-05T09:51:31.552800 | Maida |
elmlang | general | I usually use some data structure that models valid/invalid/initial and do a `mapN` on it | 2019-04-05T09:51:55.553500 | Carman |
elmlang | general | there's a bunch of form and validation libraries, for example <https://package.elm-lang.org/packages/hecrj/composable-form/latest/> | 2019-04-05T09:51:59.553600 | Emilee |
elmlang | general | And if you need something stronger than `elm-validate`, there's `the-validator` <https://package.elm-lang.org/packages/Bastes/the-validator/latest/> (cue Terminator credits soundtrack) | 2019-04-05T09:54:42.554500 | Antonette |
elmlang | general | :wink: | 2019-04-05T09:54:53.554800 | Antonette |
elmlang | general | Cool, thanks for all the pointer! :slightly_smiling_face: | 2019-04-05T09:54:55.554900 | Felisa |
elmlang | general | In your simplest case where you're using `Maybe` to model valid/invalid you can use a `mapN` function like:
```
Maybe.map4 (\v1 v2 v3 v4 -> doSomethingWith v1 v2 v3 v4)
field1
field2
field3
field4
``` | 2019-04-05T09:58:13.556800 | Carman |
elmlang | general | This will give you `Nothing` if any of the fields are `Nothing` just like in your code snippet above | 2019-04-05T09:58:45.557300 | Carman |
elmlang | general | and if all the fields are present it unwraps them and pass their values to the given lambda | 2019-04-05T09:59:07.557800 | Carman |
elmlang | general | That works but is limited tp `.map5` so not that much of an improvement over tuples. | 2019-04-05T10:02:06.558800 | Felisa |
elmlang | general | <@Felisa> if you need more you can use `Maybe.Extra.andMap` | 2019-04-05T10:11:22.559300 | Nana |
elmlang | general | Ah, cool! | 2019-04-05T10:11:51.559500 | Felisa |
elmlang | general | > Advanced functional programmers will recognize this as the implementation of <*>
I wouldn’t call myself an advanced functional programmer, but this is exactly what I was looking for! Thanks <@Nana> | 2019-04-05T10:15:21.560300 | Felisa |
elmlang | general | Does this hold true even if dependencies are at different versions? Or even some on Elm 0.19, some on 0.18? If the 0.19 apps are compiled w/optimize? | 2019-04-05T10:45:21.562300 | Tisa |
elmlang | general | As far as I can think of, that _should_ work | 2019-04-05T10:46:34.562500 | Huong |
elmlang | general | When compiling multiple main modules into a single file with `elm make --output bundle.js Main1.elm Main2.elm`, it all uses a single elm.json and shared code is deduplicated, however, in your case, you're merging the compiled artifacts under a single `Elm` variable. As far as I can think of, those are self-contained and it shouldn't matter whether they have shared or different deps/versions/options/.. | 2019-04-05T10:48:45.562700 | Huong |
elmlang | general | Is there a `Cmd` way to open an URL in a new tab (equivalent of `target=_blank`)? Or should I just head for ports? | 2019-04-05T11:29:53.563500 | Florencia |
elmlang | general | <@Florencia> I would head for ports if I were you and really, really needed not to just make a link with a `target="_blank"`. | 2019-04-05T11:35:09.564600 | Antonette |
elmlang | general | (and I don't really see why you wouldn't just make a link with a `target="_blank"`, but maybe you have in which case I'd be interested in knowing the context :slightly_smiling_face:) | 2019-04-05T11:35:51.565500 | Antonette |
elmlang | general | The current thing we do for `NavigateTo` Msgs is `Browser.Navigation.pushUrl` - so we already go the Cmd-instead-of-native-browser-behaviour route
(And I need to essentially implement a `NavigateToInNewTab`, so to speak) | 2019-04-05T11:37:19.566900 | Florencia |
elmlang | general | for ~some things~ UI links/buttons the link way is warranted, but sometimes you need to open an URL as a response to something different in `update` | 2019-04-05T11:38:01.567800 | Florencia |
elmlang | general | (I understand link's preferable though) | 2019-04-05T11:38:14.568100 | Florencia |
elmlang | general | it just doesn't cover all the usecases, it isn't a general solution | 2019-04-05T11:38:37.568500 | Florencia |
elmlang | general | Ah, yes, the case where you want to open the tab from a `Cmd`, I hadn't thought of that one. My bad. | 2019-04-05T11:40:26.569300 | Antonette |
elmlang | general | Then yes, using ports would be what makes the most amount of sense to me. | 2019-04-05T11:40:46.569800 | Antonette |
elmlang | general | Thx for validating my reasoning on this :) | 2019-04-05T11:42:22.570400 | Florencia |
elmlang | general | :wink: | 2019-04-05T11:42:28.570600 | Antonette |
elmlang | general | Weird minds think alike :slightly_smiling_face: | 2019-04-05T11:42:38.570900 | Antonette |
elmlang | general | Does anyone have experience using a date picker as a web component from Elm? I have been halfway successful with my experiments with <https://fooloomanzoo.github.io/datetime-picker/> , which is a polymer-based webcomponent, but I’m having issues binding to polymer’s property update events (don’t need anything fancy really, just want to pull the chosen value into elm’s state when component is updated) | 2019-04-05T12:36:29.576200 | Mardell |
elmlang | general | FWIW, I’m considering the web components approach as opposed to native-elm options because not needing to handle & store sub-component state/messages significantly simplifies my forms (based on hecrj/composable-form) | 2019-04-05T12:41:52.579100 | Mardell |
elmlang | general | > because not needing to handle & store sub-component state/messages significantly simplifies my forms
I’d kinda caution against using web-components for the express purpose of circumventing Elm’s architecture. | 2019-04-05T12:47:15.580200 | Theda |
elmlang | general | that’s mainly what we use web components for, I’d use effect modules but they are banned | 2019-04-05T12:56:36.582900 | Alicia |
elmlang | general | from a date picker you might want to be able to open it, close it, and get an event when a date is selected, it’s way easier to wire that up in a web component | 2019-04-05T12:57:37.583600 | Alicia |
elmlang | general | I know I'm a little late the conversation but I use <https://www.npmjs.com/package/chokidar-cli>. | 2019-04-05T13:07:19.583700 | Laurena |
elmlang | general | `chokidar "**/*.elm" -c "elm make src/Main.elm --output=elm.js" --initial` | 2019-04-05T13:07:22.584000 | Laurena |
elmlang | general | Usually in my package.json scripts:
```
"scripts": {
"build": "elm make src/Main.elm --output=elm.js",
"watch": "chokidar \"**/*.elm\" -c \"npm run build\" --initial"
},
``` | 2019-04-05T13:08:29.584200 | Laurena |
elmlang | general | Yes, we use a web component over Flatpickr for our date/time needs | 2019-04-05T13:15:54.584400 | Simon |
elmlang | general | Here’s a gist: <https://gist.github.com/aaronwhite/fd7c79f34ddc07cb6864fdb13b4b32c9> | 2019-04-05T13:15:56.584600 | Simon |
elmlang | general | Flatpickr has a good chunk of functionality, and this approach greatly simplifes the model/update burden, which means my team is far more likely to make use of them when its on the margin :slightly_smiling_face: | 2019-04-05T13:16:44.584800 | Simon |
elmlang | general | <@Theda> I’d generally agree with the sentiment of not circumventing the elm architecture, but in this case it’s a tradeoff of “where do we want to spend our dev time” — also being able to treat a datepicker in the same way we treat a plain text input, including the one-way data binding, doesn’t really strike me as circumvention. We’re just making use of the web platform to do a specialized and very compartmentalized task for us. | 2019-04-05T13:29:23.591100 | Mardell |
elmlang | general | Thanks so much, <@Simon>, this is definitely helpful. Interesting that you did the config via one big record as opposed to individual HTML attributes of the tag itself — I’m assuming this is because of how `foundDiff` is calculated in the `set config(newValue)` function to avoid re-instantiating? In what situation were config values being updated regularly? | 2019-04-05T13:46:16.591300 | Mardell |
elmlang | general | what’s elm 0.19 equivalent of elm-lang/color (if there’s any)? | 2019-04-05T13:59:59.591900 | Magdalena |
elmlang | general | I believe it's <https://package.elm-lang.org/packages/avh4/elm-color/latest/> | 2019-04-05T14:02:25.592300 | Kimbery |
elmlang | general | but it has slightly different API (for example there’s not toRgb func) | 2019-04-05T14:02:58.592900 | Magdalena |
elmlang | general | yeah, I believe those functions got moved to another package, not sure which though | 2019-04-05T14:04:08.593600 | Kimbery |
elmlang | general | hmm.. after fixing api, elm reactor now says “elm: thread blocked indefinitely in an MVar operation” is this known compiler issue? | 2019-04-05T14:07:46.594100 | Magdalena |
elmlang | general | rabbit hole goes deeper and i just wanted to use line-charts library :disappointed: | 2019-04-05T14:08:24.594800 | Magdalena |
elmlang | general | are you using `--debug`? otherwise try removing elm-stuff and a fresh compile | 2019-04-05T14:09:06.595300 | Virgie |
elmlang | general | Good q, that is the reason but more detail escapes me at the moment | 2019-04-05T14:09:46.596100 | Simon |
elmlang | general | nope, using elm reactor without --debug | 2019-04-05T14:10:08.596500 | Magdalena |
elmlang | general | Definitely know how that goes. Thanks again for the help & gist! | 2019-04-05T14:18:00.596600 | Mardell |
elmlang | general | No problem! We use web components for ChartJS, algolia, and image fallback if youre looking for more | 2019-04-05T14:18:50.597700 | Simon |
elmlang | general | I'm using JWTs to access my app's API and need to renew the token automatically if it's expired. I'm using auth0.js to renew the token so I need to use ports to call it but this means I can't just chain a request on after (using Tasks). | 2019-04-05T14:31:49.600400 | Kimbery |
elmlang | general | One option would be to queue up Cmds that need the JWT, with something like
```
type alias Model =
{ jwt : Jwt
}
type Jwt
= Ready String
| Renewing (List (String -> Cmd Msg))
``` | 2019-04-05T14:34:41.601200 | Kimbery |
elmlang | general | so I could queue up any requests that need the JWT until it's ready again | 2019-04-05T14:35:18.602000 | Kimbery |
elmlang | general | This means storing functions in the Model though... | 2019-04-05T14:35:41.602400 | Kimbery |
elmlang | general | Another option would be to model all of the requests
```
type Request
= FetchUsers
| FetchUser Int
```
and then queue those up
```
type Jwt
= Ready String
| Renewing (List Request)
```
This seems more idiomatic, but also long winded | 2019-04-05T14:37:35.603300 | Kimbery |
elmlang | general | never heard of that one :confused: | 2019-04-05T14:40:47.604200 | Nana |
elmlang | general | i have an address form that i want to use on multiple pages of my single page app. is this a case for Html.map (modelling it as kind of its own small elm app) or is there a better way? i would like to avoid having to handle all the different messages for field changes on all the pages that use the form.. | 2019-04-05T16:09:04.606400 | Daryl |
elmlang | general | <@Daryl> yup sounds like it | 2019-04-05T16:28:00.606700 | Nana |
elmlang | general | It might be worth it to reimplement auth0.js in Elm so you can use Tasks, it seems much cleaner than the other solutions you came up with. (I'm using JWT in my app and I chain Tasks.) | 2019-04-05T17:29:05.607400 | Kimiko |
elmlang | general | Is there a way to distinguish a UrlChange generated by the browser (i.e. back/forward buttons) from one generated by Browser.Navigation.pushUrl (i.e. from the app)? | 2019-04-05T17:57:41.608800 | Kimiko |
elmlang | general | <@Kimiko> You can make that distinction in onUrlRequest when the argument is a <https://package.elm-lang.org/packages/elm/browser/latest/Browser#UrlRequest>. By the time you are in onUrlChange that information is lost (unless you stashed it in your model somewhere.) | 2019-04-05T18:30:20.609600 | Dede |
elmlang | general | Yeah. Just to confirm, the `state` property of the `popstate` never makes it into Elm, which makes certain things harder | 2019-04-05T18:32:16.610600 | Kimiko |
elmlang | general | How does the vdom diff event handlers? Surely it doesn’t remove / recreate every update | 2019-04-05T19:05:57.612800 | Danika |
elmlang | general | taken. | 2019-04-06T01:29:43.613400 | Yolando |
elmlang | general | <@Danika> what are you trying to understand with this question? Are you looking for the actual implementation of the diffing algorithm that makes sure that event handling is happening efficiently? | 2019-04-06T05:08:15.614800 | Maida |
elmlang | general | Basically, yes some implementation details. The question just popped in my head as I was going to bed :sweat_smile: I’m working on a TEA-like js framework and while i probably won’t keep it, i wanted to implement my own vdom.
There’s a slight implementation difference where I have event listeners set up separately from the view; in hindsight because both Attributes and Events are part of the vdom elm should have an easier time knowing if / when to change events | 2019-04-06T05:15:00.618600 | Danika |
elmlang | general | In that case, just look at the JS source code for the virtual dom. Code looks pretty readable. | 2019-04-06T05:39:15.619300 | Maida |
elmlang | general | Has there been any discussion of supporting parameterized modules in Elm? Im curious what the pros/cons are for it. | 2019-04-06T06:04:19.620900 | Jae |
elmlang | general | Something like defining this
```
module OurModule parameterA exposing (ourFunction)
ourFunction =
parameterA
```
and then in another module referencing it with
```
import OurModule 5
-- Returns 5
a = OurModule.ourFunction
``` | 2019-04-06T06:04:26.621000 | Jae |
elmlang | general | I imagine this would be useful for any-dict implementations where instead of the dict storing the compare function or it needing to be supplied in every function call, it could be just supplied once when importing the package | 2019-04-06T06:06:20.621200 | Jae |
elmlang | general | If you wanted to import the same parameterized module multiple times then I imagine the syntax would look like this
```
import OurModule 5 as OurModule5
import OurModule 6 as OurModule6
-- Returns 5
a = OurModule5.ourFunction
-- Returns 6
b = OurModule6.ourFunction
``` | 2019-04-06T06:09:22.621400 | Jae |
elmlang | general | There have been discussions but they did not lead to any concrete conclusion. | 2019-04-06T07:25:53.621800 | Maida |
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