accounts-frontend/src/components/ui/form/Form.tsx

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import React from 'react';
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import classNames from 'classnames';
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import logger from 'services/logger';
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import FormModel from './FormModel';
import styles from './form.scss';
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interface Props {
id: string;
isLoading: boolean;
form?: FormModel;
onSubmit: (form: FormModel | FormData) => void | Promise<void>;
onInvalid: (errors: { [errorKey: string]: string }) => void;
children: React.ReactNode;
}
interface State {
isTouched: boolean;
isLoading: boolean;
}
type InputElement = HTMLInputElement | HTMLTextAreaElement;
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export default class Form extends React.Component<Props, State> {
static defaultProps = {
id: 'default',
isLoading: false,
onSubmit() {},
onInvalid() {},
};
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state = {
isTouched: false,
isLoading: this.props.isLoading || false,
};
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formEl: HTMLFormElement | null;
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mounted = false;
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componentDidMount() {
if (this.props.form) {
this.props.form.addLoadingListener(this.onLoading);
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}
this.mounted = true;
}
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componentWillReceiveProps(nextProps: Props) {
if (nextProps.id !== this.props.id) {
this.setState({
isTouched: false,
});
}
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if (
typeof nextProps.isLoading !== 'undefined' &&
nextProps.isLoading !== this.state.isLoading
) {
this.setState({
isLoading: nextProps.isLoading,
});
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}
const nextForm = nextProps.form;
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if (nextForm && this.props.form && nextForm !== this.props.form) {
this.props.form.removeLoadingListener(this.onLoading);
nextForm.addLoadingListener(this.onLoading);
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}
}
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componentWillUnmount() {
if (this.props.form) {
this.props.form.removeLoadingListener(this.onLoading);
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}
this.mounted = false;
}
render() {
const { isLoading } = this.state;
return (
<form
className={classNames(styles.form, {
[styles.isFormLoading]: isLoading,
[styles.formTouched]: this.state.isTouched,
})}
onSubmit={this.onFormSubmit}
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ref={(el: HTMLFormElement | null) => (this.formEl = el)}
noValidate
>
{this.props.children}
</form>
);
}
submit() {
if (!this.state.isTouched) {
this.setState({
isTouched: true,
});
}
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const form = this.formEl;
if (!form) {
return;
}
if (form.checkValidity()) {
const result = this.props.onSubmit(
this.props.form ? this.props.form : new FormData(form),
);
if (result && result.then) {
this.setState({ isLoading: true });
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result
.catch((errors: { [key: string]: string }) => {
this.setErrors(errors);
})
.finally(() => this.mounted && this.setState({ isLoading: false }));
}
} else {
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const invalidEls: NodeListOf<InputElement> = form.querySelectorAll(
':invalid',
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);
const errors = {};
invalidEls[0].focus(); // focus on first error
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Array.from(invalidEls).reduce((acc, el: InputElement) => {
if (!el.name) {
logger.warn('Found an element without name', { el });
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return acc;
}
let errorMessage = el.validationMessage;
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if (el.validity.valueMissing) {
errorMessage = `error.${el.name}_required`;
} else if (el.validity.typeMismatch) {
errorMessage = `error.${el.name}_invalid`;
}
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acc[el.name] = errorMessage;
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return acc;
}, errors);
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this.setErrors(errors);
}
}
setErrors(errors: { [key: string]: string }) {
this.props.form && this.props.form.setErrors(errors);
this.props.onInvalid(errors);
}
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onFormSubmit = (event: React.FormEvent<HTMLFormElement>) => {
event.preventDefault();
this.submit();
};
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onLoading = (isLoading: boolean) => this.setState({ isLoading });
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}