gurubot2/src/components/AddCrudItem/index.js

import React, { Component } from 'react';
import PropTypes from 'prop-types';

import Field from 'components/Field';

import './style.scss';

function getEmptyValue(type) {
    if (type === 'text' || type === 'textarea') {
        return '';
    }
    if (type === 'number') {
        return 0;
    }

    return null;
}

function makeEmptyFields(docFields) {
    return Object.keys(docFields).reduce((items, key) => ({
        ...items,
        [key]: getEmptyValue(docFields[key].type)
    }), {});
}

export default class AddCrudItem extends Component {
    static propTypes = {
        docFields: PropTypes.object.isRequired,
        onCreate: PropTypes.func.isRequired
    };

    constructor(props) {
        super(props);

        this.state = makeEmptyFields(props.docFields);

        this.onFieldChange = Object.keys(props.docFields).reduce((items, key) => ({
            ...items,
            [key]: event => {
                this.setState({
                    [key]: event.target.value
                });
            }
        }), {});
    }

    onCreate = () => {
        this.props.onCreate(this.state);

        this.setState(makeEmptyFields(this.props.docFields));
    };

    render() {
        const {
            docFields
        } = this.props;

        const fields = Object.keys(docFields).map(key => (
            <div key={key} className="field-wrapper">
                <span className="title">{key}</span>
                <Field
                    type={docFields[key].type}
                    value={this.state[key]}
                    onChange={this.onFieldChange[key]}
                />
            </div>
        ));

        return (
            <div className="add-field-wrapper">
                <div className="fields">
                    {fields}
                </div>
                <div className="meta">
                    <button className="button-add" onClick={this.onCreate}>{'Add'}</button>
                </div>
            </div>
        );
    }
}