小编Jak*_*won的帖子

我是新来的反应。

我正在尝试使用下面的库来使用下拉菜单。

当我添加“required”属性时，它不会使用表单标记对其进行验证。

https://www.npmjs.com/package/react-select

import React from 'react';
import Select from 'react-select';

const options = [{
        value: 'chocolate',
        label: 'Chocolate'
    },
    {
        value: 'strawberry',
        label: 'Strawberry'
    },
    {
        value: 'vanilla',
        label: 'Vanilla'
    },
];

class App extends React.Component {
    state = {
        selectedOption: null,
    };
    handleChange = selectedOption => {
        this.setState({
            selectedOption
        });
        console.log(`Option selected:`, selectedOption);
    };
    render() {
        const {
            selectedOption
        } = this.state;

        return ( <
            Select value = {
                selectedOption
            }
            onChange = {
                this.handleChange
            }
            options …

任何人都可以帮助我解决 .env-cmd 问题吗？

env-cmd 错误：无法在路径中找到 .env 文件：.env.development at getEnvFile C:\Users\Jake\project\fcmanager-frontend\node_modules\env-cmd\dist\get-env-vars.js

package.json 文件：

  "scripts": {
    "start": "env-cmd -f .env.development react-scripts start",
    "build": "env-cmd -f .env.development react-scripts build",
    "start-prod": "env-cmd -f .env.production react-scripts start",
    "build-prod": "env-cmd -f .env.production react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },