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73 lines
2.4 KiB
73 lines
2.4 KiB
import {reportError} from 'app/client/models/errors';
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import {ApiError} from 'app/common/ApiError';
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import {BaseAPI} from 'app/common/BaseAPI';
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import {dom, Observable} from 'grainjs';
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/**
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* Handles submission of an HTML form element.
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*
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* When the form is submitted, `onSubmit` will be called, followed by
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* either `onSuccess` or `onError`, depending on whether `onSubmit` threw any
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* unhandled errors. The `pending` observable is set to true until `onSubmit`
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* resolves.
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*/
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export function handleSubmit<T>(
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pending: Observable<boolean>,
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onSubmit: (fields: { [key: string]: string }, form: HTMLFormElement) => Promise<T> = submitForm,
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onSuccess: (v: T) => void = () => { /* noop */ },
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onError: (e: unknown) => void = (e) => reportError(e as string | Error)
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): (elem: HTMLFormElement) => void {
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return dom.on('submit', async (e, form) => {
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e.preventDefault();
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try {
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if (pending.get()) { return; }
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pending.set(true);
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const result = await onSubmit(formDataToObj(form), form).finally(() => pending.set(false));
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onSuccess(result);
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} catch (err) {
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onError(err);
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}
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});
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}
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/**
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* Convert a form to a JSON-stringifiable object, ignoring any File fields.
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*/
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export function formDataToObj(formElem: HTMLFormElement): { [key: string]: string } {
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// Use FormData to collect values (rather than e.g. finding <input> elements) to ensure we get
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// values from all form items correctly (e.g. checkboxes and textareas).
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const formData = new FormData(formElem);
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const data: { [key: string]: string } = {};
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for (const [name, value] of formData.entries()) {
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if (typeof value === 'string') {
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data[name] = value;
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}
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}
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return data;
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}
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/**
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* Submit a form using BaseAPI. Send inputs as JSON, and interpret any reply as JSON.
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*/
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export async function submitForm(fields: { [key: string]: string }, form: HTMLFormElement): Promise<any> {
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return BaseAPI.requestJson(form.action, {method: 'POST', body: JSON.stringify(fields)});
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}
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/**
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* Sets the error details on `errObs` if `err` is a 4XX error (except 401). Otherwise, reports the
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* error via the Notifier instance.
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*/
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export function handleFormError(err: unknown, errObs: Observable<string|null>) {
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if (
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err instanceof ApiError &&
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err.status !== 401 &&
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err.status >= 400 &&
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err.status < 500
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) {
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errObs.set(err.details?.userError ?? err.message);
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} else {
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reportError(err as Error|string);
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}
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}
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