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elmlang | general | So the component’s model can know that the component requested a new field.
A component’s view is called when the top level data changes. | 2019-05-03T16:24:02.055500 | Leoma |
elmlang | general | So, if you are waiting for the first time that a particular relationship between a component’s history AND the data model exist, you will get that during a call to view. | 2019-05-03T16:25:06.055700 | Leoma |
elmlang | general | If you want to trigger some work when that happens, you will need to trigger it from view. | 2019-05-03T16:25:26.055900 | Leoma |
elmlang | general | I feel that for a stateful component "new data is available for rendering" should be a Msg too. | 2019-05-03T16:25:28.056100 | Jake |
elmlang | general | Same as it is at the top-level where you get a Msg from a port | 2019-05-03T16:26:06.056300 | Jake |
elmlang | general | Ok, there’s a problem with that, and the problem is that it is not enforcable with the type system | 2019-05-03T16:26:16.056500 | Leoma |
elmlang | general | <@Leoma> do you have a simplified example of how you know when your input is ready? | 2019-05-03T16:26:24.056700 | Chae |
elmlang | general | no i don’t | 2019-05-03T16:27:07.056900 | Leoma |
elmlang | general | I’m trying to explain more broadly | 2019-05-03T16:27:26.057100 | Leoma |
elmlang | general | Please give me a moment without more quesitons | 2019-05-03T16:27:40.057300 | Leoma |
elmlang | general | A component’s view can generate messages, (and a (component might have subscriptions). These will have a type of Component.Msg. So if another view/update uses them, it HAS to wrap them `type Msg = ... | MyComponentMsg Component.Msg` | 2019-05-03T16:29:31.057500 | Leoma |
elmlang | general | So, at this level, in update, when we get a `MyComponentMsg Component.Msg` it’s very clear how it must be handled. `Component.update` should be the only function with a type signature that can make use of these messages. | 2019-05-03T16:30:26.057700 | Leoma |
elmlang | general | So it is very easy and clear to enforce “a component’s model is the result of the history of events on that component” | 2019-05-03T16:30:58.057900 | Leoma |
elmlang | general | There is no way to easily enforce “I’m a component that needs it’s update called when particular data changes occur, and I really hope whoever is using me remembers to to that diligently” | 2019-05-03T16:31:57.058100 | Leoma |
elmlang | general | Consider that such a change could occur in any part of the parent’s update function, or any functions it calls. It is very challenging to enforce this cleanly. | 2019-05-03T16:32:55.058300 | Leoma |
elmlang | general | It also breaks the single source of truth as a component now has a copy of data that exists in it’s callee’s model. | 2019-05-03T16:33:37.058500 | Leoma |
elmlang | general | For those reasons, I’m convinced that there will be times you want to look at data coming in from the parent model, AND data available in the component’s model, and trigger an event. And the cleanest place to do this is during view. | 2019-05-03T16:34:35.058700 | Leoma |
elmlang | general | Does that all make sense? | 2019-05-03T16:34:45.058900 | Leoma |
elmlang | general | It does make sense | 2019-05-03T16:36:02.059100 | Chae |
elmlang | general | Yay! Thanks for listening. | 2019-05-03T16:36:19.059300 | Leoma |
elmlang | general | Am I understanding correctly that the view for this component is relying on data from it’s own model as well as a “parent” model? | 2019-05-03T16:38:48.059500 | Chae |
elmlang | general | Again, a component’s model is a function of it’s history. What a component renders is a function of it’s history AND ALSO what the callee passes into view.
Consider an info panel that can be toggled open and shut. The component’s model might have `{isOpen : Bool}`, and the view might be `view : String -> Model ->... | 2019-05-03T16:41:35.059800 | Leoma |
elmlang | general | So the implementation of view says “if my current model is open, render the toggle button and String passed in, else just render the toggle button” | 2019-05-03T16:42:30.060000 | Leoma |
elmlang | general | Ok! That makes a ton of sense to me as I’ve encountered that exact scenario many times (in React actually) | 2019-05-03T16:43:10.060200 | Chae |
elmlang | general | I’ve found that with something like that, it’s much easier to store things like `isOpen` and such in the parent/global state. The only time I use a “component” model is when the values in the local model are truly local. | 2019-05-03T16:45:26.060400 | Chae |
elmlang | general | Ok, so suppose we have a requirement that if a view is toggled open, and that rendered view contains a profanity, we need to log a message via http call. | 2019-05-03T16:45:29.060600 | Leoma |
elmlang | general | Hmm | 2019-05-03T16:47:27.061200 | Chae |
elmlang | general | Again. A component’s model is generated by a history of the events the component has generated. Other stuff is not a part of that model. There’s nothing else to it.
The first time we can simultaneously look at “history of the events the component has generated” and “other stuff” is in view. | 2019-05-03T16:47:40.061400 | Leoma |
elmlang | general | And again, the type system makes it easy to enforce that Msg originating from a component are sent back to it’s update. Anything else is hopes/prayers and fighting the type system. | 2019-05-03T16:51:25.062300 | Leoma |
elmlang | general | My gut is telling me that `isOpen` should be part of the “parent” model. But I’m going to think about it for a bit.
Just over a year ago we had a situation where we needed to focus a field that could be inside a collapsed accordion view, and if so open that section of the form. We ended up moving the open state of the... | 2019-05-03T16:53:26.062500 | Chae |
elmlang | general | Right, so the toggle was an example. | 2019-05-03T16:56:55.062700 | Leoma |
elmlang | general | But if you agree that there is a possibility that some data should be in the component’s model, then I think the rest of my ideas hold. | 2019-05-03T16:57:52.062900 | Leoma |
elmlang | general | In any case, I’m not suggesting it’s impossible to avoid the need for `view : Model -> (Html Msg, Cmd Msg)`, I’m suggesting that at times, avoiding that need will be unnatural and problematic. | 2019-05-03T17:00:27.063100 | Leoma |
elmlang | general | Now, a custom element can use `dispatchEvent` in `connectedCallback` to trigger any event. Via this hack, one can trigger a Cmd Msg when something is rendered. Effectively giving you `view : Model -> (Html Msg, Cmd Msg)` | 2019-05-03T17:02:11.063300 | Leoma |
elmlang | general | I am using that now to make the rest of my code nicer. | 2019-05-03T17:02:37.063500 | Leoma |
elmlang | general | never mind, I've restarted elm-live and... it is working well. | 2019-05-03T17:06:28.063700 | Loralee |
elmlang | general | Garage startup, 3 guys dream big and want to change the world with the right “you”. (SF Bay Area Only)
Looking for “you” who are passionate about social networking platform.
Currently, we are looking for a designer and a full-stack software engineer. You can also contact us to make friends or share thoughts as being ... | 2019-05-03T19:54:37.064000 | Brigida |
elmlang | general | Erm | 2019-05-03T20:45:02.064400 | Danika |
elmlang | general | Probably not the most appropriate place for this | 2019-05-03T20:45:13.064800 | Danika |
elmlang | general | _maybe_ <#C0LUAGWRK|jobs> if you’re actually trying to hire someone... | 2019-05-03T20:45:34.065500 | Danika |
elmlang | general | :wave: hi, my team has been using this tool: <https://fractal.build/> and I was wondering if Elm + some webpack magic could serve as a replacement? Our workflow for building this auto documenting static site style guide is basically:
1. Build a SMACCS/BEM module, adhere to naming conventions, write the SCSS and the HT... | 2019-05-03T21:52:07.069800 | Winnifred |
elmlang | general | In Browser.Dom package docs, there's this code example,
```import Browser.Dom as Dom
import Task
type Msg = NoOp
jumpToBottom : String -> Cmd Msg
jumpToBottom id =
Dom.getViewportOf id
|> Task.andThen (\info -> Dom.setViewportOf id 0 info.scene.height)
|> Task.perform (\_ -> NoOp)```
Shouldn'... | 2019-05-04T05:11:20.071000 | Jae |
elmlang | general | <https://github.com/elm/browser/commit/8ea63a705801326d414707cb8fe12c4d4a62b5e4> :slightly_smiling_face: | 2019-05-04T05:12:21.071200 | Lea |
elmlang | general | Ah, thanks! | 2019-05-04T05:15:21.071400 | Jae |
elmlang | general | If I want to create a countdown, is there some trick to avoid an update every second (for second precision clock)? | 2019-05-04T05:57:09.072500 | Carter |
elmlang | general | No. | 2019-05-04T05:58:25.072700 | Niesha |
elmlang | general | Is there a problem with updating every second? | 2019-05-04T05:58:38.073000 | Ashton |
elmlang | general | <@Chin> I do lazy update of just the clock but if i do every second i get a quite high cpu average | 2019-05-04T06:08:30.074100 | Carter |
elmlang | general | Have you tried `Html.Lazy`? | 2019-05-04T06:35:38.074500 | Ashton |
elmlang | general | Just settings the value in your model every second shouldnt be too taxing, my expectation is that its _other_ stuff thats taxing the cpu, like recomputing the Dom after every update, even tho it hasnt changed. | 2019-05-04T06:36:56.076100 | Ashton |
elmlang | general | You can get some of your performance back with `Html.Lazy`, if thats the case. | 2019-05-04T06:37:18.076500 | Ashton |
elmlang | general | Has there been any progress on server-side Elm? I haven't checked in a year or so. | 2019-05-04T16:15:09.079100 | Gayla |
elmlang | general | You could use a `Platform.worker` with the html string library and fake it? <https://package.elm-lang.org/packages/zwilias/elm-html-string/2.0.2/Html-String>
No official progress though | 2019-05-04T16:29:38.080300 | Danika |
elmlang | general | Thanks. That's a nodejs API?
It looks like this was the last word (Aug 21, 2018) <https://github.com/elm/browser/issues/19#issuecomment-414813158> | 2019-05-04T16:32:28.081100 | Gayla |
elmlang | general | You’d need to use ports in combination with the above html-string library. You could send the complete html string over a port and serve it with something like express | 2019-05-04T16:35:35.082500 | Danika |
elmlang | general | Might as well go with purescript. | 2019-05-04T16:40:15.083000 | Niesha |
elmlang | general | Hmm im not sure I’d agree with that, but I do think server side elm is still not “there” for anything but experimentation rn | 2019-05-04T16:41:55.084000 | Danika |
elmlang | general | anyone have an implementation of `Parser.deadEndsToString` ? | 2019-05-04T16:51:41.084800 | Simon |
elmlang | general | you mean something custom? | 2019-05-04T16:53:28.085000 | Virgie |
elmlang | general | The builtin one is a todo :sweat_smile: | 2019-05-04T16:54:04.085100 | Huong |
elmlang | general | It was surprising, I kept searching my code over and over for the errant “TODO” :rolling_on_the_floor_laughing: | 2019-05-04T16:54:31.085300 | Simon |
elmlang | general | There are some open PR’s with very simple implementations that you could use. It would be cool if someone were to make an implementation that can show relevant snippets from the original input along the way, though that’s more relevant to the Parser.Advanced modules I suppose | 2019-05-04T16:56:25.085500 | Huong |
elmlang | general | Appreciate it, will check there (And while that would be cool, I’m just looking to hammer out my parsers implementation gaps | 2019-05-04T16:57:12.085700 | Simon |
elmlang | general | Also kind of amazing/sad someone contributed a simple PR in good faith that just sits there :confused: | 2019-05-04T16:58:19.085900 | Simon |
elmlang | general | Ah, that code works the charm, thanks <@Huong> | 2019-05-04T17:01:48.086100 | Simon |
elmlang | general | linko? | 2019-05-04T20:09:48.086600 | Gayla |
elmlang | general | <https://github.com/elm/parser/pull/16/files> | 2019-05-04T20:10:10.086800 | Simon |
elmlang | general | It looks like no committer has looked at it. | 2019-05-04T20:12:32.087000 | Gayla |
elmlang | general | hence the sad part | 2019-05-04T20:12:48.087200 | Simon |
elmlang | general | The change from 2018 to 2019 does not make sense to me | 2019-05-05T07:44:27.087600 | Tobie |
elmlang | general | Is this the right way to produces a String with a `\0` char? I need to remove those from a String.
```null = String.fromChar '\u{0000}'``` | 2019-05-05T11:03:05.089900 | Hoa |
elmlang | general | Directly using `\0` doesn’t work | 2019-05-05T11:03:49.090500 | Hoa |
elmlang | general | So using `Byte.Parser` I thought to do something like: `String.replace null "" (P.string 64)` | 2019-05-05T11:05:11.091000 | Hoa |
elmlang | general | You could also do `"\u{0000}"` - no need to go through a `Char` first | 2019-05-05T11:28:42.093000 | Huong |
elmlang | general | Right! Simpler. | 2019-05-05T11:29:08.093300 | Hoa |
elmlang | general | Anyway, it works. :slightly_smiling_face: | 2019-05-05T11:29:14.093500 | Hoa |
elmlang | general | is there a good place to tell the Elm team on the rare occasions that a compiler message seems buggy or unenlightening? | 2019-05-05T13:34:24.095100 | Cher |
elmlang | general | <https://github.com/elm/compiler/issues> | 2019-05-05T13:46:42.095300 | Dede |
elmlang | general | <@Dede> thx! | 2019-05-05T13:50:40.095800 | Cher |
elmlang | general | There's also a dedicated repo for tracking bad error messages | 2019-05-05T13:56:09.096500 | Huong |
elmlang | general | <https://github.com/elm/error-message-catalog> that's the one. It's a good place for tracking suboptimal error messages | 2019-05-05T14:09:05.097500 | Huong |
elmlang | general | <@Huong> ah, even better. opened the issue | 2019-05-05T14:20:55.098400 | Cher |
elmlang | general | Do we know if there is any fix in works for those buggy type error messages? sth like
```
expecting:
Arg -> Result
but I got:
Arg -> Result
``` | 2019-05-05T16:11:46.100200 | Florencia |
elmlang | general | the way I understand it, the actual "actual" type is something else and this is a bug in the error reporting | 2019-05-05T16:13:07.102400 | Florencia |
elmlang | general | it's cropped up a few times since 0.19 | 2019-05-05T16:13:30.102900 | Florencia |
elmlang | general | there has been some reshuffling in error reporting in the compiler source since 0.19. Wouldn't normally notice but I'm using the elm compiler as a reference in a compiler construction course | 2019-05-05T16:51:04.103000 | Virgie |
elmlang | general | so, hopefully yes | 2019-05-05T16:51:18.103200 | Virgie |
elmlang | general | i was wondering, is there a reason why `Time.Posix` is not `comparable`? | 2019-05-06T09:40:11.106100 | Lilli |
elmlang | general | This way i can't use the `(>)` operator. Sure, i can write my function comparePosix, but maybe this change was made to avoid comparison? (?)
i'm a bit confused :sweat_smile: | 2019-05-06T09:42:31.107900 | Lilli |
elmlang | general | It’s not because `Time.Posix` shouldn’t be comparable. It’s because, more strongly, there are general rules for what is comparable. Basic types like numbers, strings, (not Bools), tuples, lists.
Because Time.Posix is not one of those, it isn’t comparable.
Because we have `posixToMillis` and `millisToPosix`, we can co... | 2019-05-06T09:54:49.108000 | Leoma |
elmlang | general | Hey everyone, Is someone familiar with the Random package? I'm using elm 0.19 and I can't find a way to use it nor install it | 2019-05-06T09:58:28.109400 | Wai |
elmlang | general | Can you check you’re trying to install `elm/random` (0.19 compatible) and not `elm-lang/random` (pre 0.19)? | 2019-05-06T10:00:22.110500 | Huong |
elmlang | general | `comparable` is compiler magic, and the magic doesn't support `Time.Posix`. You could probably make a PR. | 2019-05-06T10:00:35.110600 | Niesha |
elmlang | general | I tried it: ```elm-package install elm/random
Error: Could not find any packages named elm/random.``` | 2019-05-06T10:01:05.111200 | Wai |
elmlang | general | elm install elm/random | 2019-05-06T10:01:34.111500 | Danika |
elmlang | general | elm-package is 0.18 | 2019-05-06T10:01:40.111800 | Danika |
elmlang | general | OMG thanks | 2019-05-06T10:01:57.112000 | Wai |
elmlang | general | :smile: | 2019-05-06T10:02:19.112200 | Danika |
elmlang | general | something else... Is there a way when reading the doc to know to which elm version it apply ? | 2019-05-06T10:03:12.113100 | Wai |
elmlang | general | For official packages, elm/* is 0.19 and elm-lang/* is 0.18.
For others, the site will only show 0.19 packages when you search. Google still indexes a lot if 0.18 packages. The easiest way to check is look at the repo, if it has an elm-package.json its 0.18. | 2019-05-06T10:07:59.115700 | Danika |
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