我正在创建一个饮料计数器,作为学习redux项目的一部分,该计数器将计算所消耗的饮料量。
我有一些初始状态,它有一个包含饮料集合和当前计数的饮料属性:
//State
{
drinks: {
coffee: 0,
water: 0,
}
//...
}
我创建了一个Counter
表示组件:
import React from 'react';
import PropTypes from 'prop-types';
import Button from './Button';
const ucFirst = string => string.charAt(0).toUpperCase() + string.slice(1);
const Counter = ({name, count, onIncrement, onDecrement}) => (
<div className="counter">
<h2>{ucFirst(name)}</h2>
<span>{count}</span>
<Button onClick={() => {onIncrement(name)}}>+</Button>
<Button onClick={() => {onDecrement(name)}}>-</Button>
</div>
);
Counter.propTypes = {
name: PropTypes.string.isRequired,
count: PropTypes.number.isRequired,
onIncrement: PropTypes.func.isRequired,
onDecrement: PropTypes.func.isRequired,
}
export default Counter;
然后是DrinkCounter
容器组件:
import { connect } from 'react-redux'
import { incrementDrink, decrementDrink } from '../actions'
import Counter from '../components/Counter'
const mapStateToProps = (state, ownProps) => ({
count: state.drinks[ownProps.drink],
name: ownProps.drink
})
const mapDispatchToProps = dispatch => ({
onIncrement: drink => dispatch(incrementDrink(drink)),
onDecrement: drink => dispatch(decrementDrink(drink))
})
export default connect(
mapStateToProps,
mapDispatchToProps
)(Counter)
如果我添加,这将按预期工作
<DrinksContainer name="coffee" />
进入我的CCD_ 3组件。
现在问题就从这里开始了,我想再创建两个组件——一个表示组件和一个容器,它们将映射到我的drinks
对象的键上,并为每个对象输出一个DrinkCounter
。我有以下代码,但我得到了错误"失败的道具类型:道具name
在Counter
中标记为必需,但其值为undefined
">
这里是List
容器:
import React, {Fragment} from 'react'
import PropTypes from 'prop-types'
import DrinkCounter from '../containers/DrinkCounter'
const List = ({drinks}) => {
return (
<Fragment>
{
Object.keys(drinks).map(
(drink, index) => (<DrinkCounter name={drink} key={index} />)
)
}
</Fragment>
)
}
List.propTypes = {
drinks: PropTypes.object.isRequired
}
export default List
这是DrinksList
容器:
import React from 'react';
import {connect} from 'react-redux';
import List from '../components/List';
const mapStateToProps = state => ({
drinks: state.drinks
})
export default connect(mapStateToProps)(List);
有人能解释一下我哪里错了吗?
我已经解决了这个问题,在List
组件中,我给DrinkCounter
提供了错误的道具,我正在传递name
,而实际上它应该是drink
。