demarches-normaliennes/app/javascript/controllers/turbo_controller.ts

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import { Actions } from '@coldwired/actions';
import { parseTurboStream } from '@coldwired/turbo-stream';
import invariant from 'tiny-invariant';
import { session as TurboSession, type StreamElement } from '@hotwired/turbo';
import { ApplicationController } from './application_controller';
type StreamRenderEvent = CustomEvent<{
render(streamElement: StreamElement): void;
}>;
type FrameRenderEvent = CustomEvent<{
render(currentElement: Element, newElement: Element): void;
}>;
export class TurboController extends ApplicationController {
static targets = ['spinner'];
declare readonly spinnerTargets: HTMLElement[];
#submitting = false;
#actions?: Actions;
// `actions` instrface exposes all available actions as methods and also `applyActions` method
// wich allows to apply a batch of actions. On top of regular `turbo-stream` actions we also
// expose `focus`, `enable`, `disable`, `show` and `hide` actions. Each action take a `targets`
// option (wich can be a CSS selector or a list of DOM nodes) and a `fragment` option (wich is a
// `DocumentFragment` and only required on "rendering" actions).
get actions() {
invariant(this.#actions, 'Actions not initialized');
return this.#actions;
}
connect() {
this.#actions = new Actions({
element: document.body,
schema: {
forceAttribute: 'data-turbo-force',
permanentAttribute: 'data-turbo-permanent',
focusGroupAttribute: 'data-turbo-focus-group',
focusDirectionAttribute: 'data-turbo-focus-direction',
hiddenClassName: 'hidden'
},
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debug: false
});
// actions#observe() is an interface over specialized mutation observers.
// They allow us to preserve certain HTML changes across mutations.
this.#actions.observe();
// setup spinner events
this.onGlobal('turbo:submit-start', () => this.startSpinner());
this.onGlobal('turbo:submit-end', () => this.stopSpinner());
this.onGlobal('turbo:fetch-request-error', () => this.stopSpinner());
// prevent scroll on turbo form submits
this.onGlobal('turbo:render', () => this.preventScrollIfNeeded());
// see: https://turbo.hotwired.dev/handbook/streams#custom-actions
this.onGlobal('turbo:before-stream-render', (event: StreamRenderEvent) => {
event.detail.render = (streamElement: StreamElement) =>
this.actions.applyActions([parseTurboStream(streamElement)]);
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});
// see: https://turbo.hotwired.dev/handbook/frames#custom-rendering
this.onGlobal('turbo:before-frame-render', (event: FrameRenderEvent) => {
event.detail.render = (currentElement, newElement) => {
// There is a bug in morphdom when it comes to mutate a custom element. It will miserably
// crash. We mutate its content instead.
const fragment = document.createDocumentFragment();
fragment.append(...newElement.childNodes);
this.actions.update({ targets: [currentElement], fragment });
};
});
}
private startSpinner() {
this.#submitting = true;
this.actions.show({ targets: this.spinnerTargets });
}
private stopSpinner() {
this.#submitting = false;
this.actions.hide({ targets: this.spinnerTargets });
}
private preventScrollIfNeeded() {
if (this.#submitting && TurboSession.navigator.currentVisit) {
TurboSession.navigator.currentVisit.scrolled = true;
}
}
}