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Diffstat (limited to 'examples/04-http-requests/src')
-rw-r--r-- | examples/04-http-requests/src/app.gleam | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/examples/04-http-requests/src/app.gleam b/examples/04-http-requests/src/app.gleam new file mode 100644 index 0000000..ac75d42 --- /dev/null +++ b/examples/04-http-requests/src/app.gleam @@ -0,0 +1,91 @@ +import gleam/dynamic +import gleam/option.{type Option, None, Some} +import lustre +import lustre/attribute +import lustre/effect.{type Effect} +import lustre/element.{type Element} +import lustre/element/html +import lustre/event +// Lustre_http is a community package that provides a simple API for making +// HTTP requests from your update function. You can find the docs for the package +// here: +// +// https://hexdocs.pm/lustre_http/index.html +import lustre_http.{type HttpOrJsonError} +// These examples are written with lustre_ui in mind. They'll work regardless, +// but to see what lustre_ui can do make sure to run each of these examples with +// the `--include-styles` flag: +// +// $ gleam run -m lustre/try -- --include-styles +// +// In your own apps, make sure to add the `lustre_ui` dependency and include the +// stylesheet somewhere. +import lustre/ui +import lustre/ui/aside + +// MAIN ------------------------------------------------------------------------ + +pub fn main() { + let app = lustre.application(init, update, view) + let assert Ok(_) = lustre.start(app, "#app", Nil) +} + +// MODEL ----------------------------------------------------------------------- + +type Model { + Model(quote: Option(String)) +} + +fn init(_) -> #(Model, Effect(Msg)) { + #(Model(quote: None), effect.none()) +} + +// UPDATE ---------------------------------------------------------------------- + +pub opaque type Msg { + Refresh + GotQuote(Result(String, HttpOrJsonError)) +} + +fn update(model: Model, msg: Msg) -> #(Model, Effect(Msg)) { + case msg { + Refresh -> #(model, get_quote()) + GotQuote(Ok(quote)) -> #(Model(quote: Some(quote)), effect.none()) + GotQuote(Error(_)) -> #(model, effect.none()) + } +} + +fn get_quote() -> Effect(Msg) { + let url = "https://api.quotable.io/random" + let decoder = dynamic.field("content", dynamic.string) + + lustre_http.get_as_json(url, GotQuote, decoder) +} + +// VIEW ------------------------------------------------------------------------ + +fn view(model: Model) -> Element(Msg) { + let styles = [#("width", "100vw"), #("height", "100vh")] + + ui.centre( + [attribute.style(styles)], + ui.aside( + [aside.min_width(70), attribute.style([#("width", "60ch")])], + view_quote(model.quote), + ui.button([event.on_click(Refresh)], [element.text("New quote")]), + ), + ) +} + +fn view_quote(quote: Option(String)) -> Element(msg) { + case quote { + Some(quote) -> + ui.stack([], [ + element.text("Someone once said..."), + html.p([attribute.style([#("font-style", "italic")])], [ + element.text(quote), + ]), + ]) + None -> html.p([], [element.text("Click the button to get a quote!")]) + } +} |