ngrx-forms
Version:
Proper integration of forms in Angular 4 applications using ngrx
29 lines • 5.54 kB
JavaScript
import { SetErrorsAction } from '../../actions';
import { deepEquals, isEmpty } from '../../util';
export function setErrorsReducer(state, action) {
if (action.type !== SetErrorsAction.TYPE) {
return state;
}
if (state.isDisabled) {
return state;
}
if (state.errors === action.errors) {
return state;
}
if (deepEquals(state.errors, action.errors)) {
return state;
}
if (!action.errors || typeof action.errors !== 'object' || Array.isArray(action.errors)) {
throw new Error(`Control errors must be an object; got ${action.errors}`); // `;
}
if (Object.keys(action.errors).some(key => key.startsWith('$'))) {
throw new Error(`Control errors must not use $ as a prefix; got ${JSON.stringify(action.errors)}`); // `;
}
const asyncErrors = Object.keys(state.errors)
.filter(key => key.startsWith('$'))
.reduce((res, key) => Object.assign(res, { [key]: state.errors[key] }), {});
const newErrors = isEmpty(asyncErrors) ? action.errors : Object.assign(asyncErrors, action.errors);
const isValid = isEmpty(newErrors);
return Object.assign(Object.assign({}, state), { isValid, isInvalid: !isValid, errors: newErrors });
}
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