我看不到甜甜圈,因为数据仅在保存 (cntrl+s) 后才设置为 [0,0,0],它会再次使用所需值呈现并显示甜甜圈。我正在使用 redux 商店,一切都在使用代码和操作。编码:
import { Component } from 'react';
import { Doughnut } from 'react-chartjs-2';
import { connect } from 'react-redux';
import { loadToys, removeToy } from '../store/Actions/toyActions'
class _Dashboard extends Component {
state = {
data: null
}
componentDidMount() {
this.props.loadToys()
this.onLoad()
}
onLoad = () => {
const adult = this.props.toys.filter(toy => toy.type === 'Adult').length
const funny = this.props.toys.filter(toy => toy.type === 'Funny').length
const educational = this.props.toys.filter(toy => toy.type === 'Educational').length
this.setState({
data: {
labels: ['Adult', 'Funny', 'Educational'],
datasets:
[{
backgroundColor: [
'rgb(255, 99, 132)',
'rgb(54, 162, 235)',
'rgb(255, 205, 86)'
],
hoverOffset: 4
,
data: [adult, funny, educational]
}
]
}
})
}
render() {
return (
<div> <h1>Toys by type</h1>
<Doughnut
data={this.state.data}
redraw
/>
</div >
);
}
}
const mapGlobalStateToProps = (state) => {
return {
toys: state.toyModule.toys
}
}
const mapDistpatchToProps = {
loadToys,
removeToy
}
export const Dashboard = connect(mapGlobalStateToProps, mapDistpatchToProps)(_Dashboard)