Javascript 连接不与 Redux-react 中的 StateLess 组件一起工作
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Connect not working with StateLess component in Redux-react
提问by sapy
I'm dispatching an action from some-other component , and store is getting updated with svgArrproperty, but though the following Stateless component connect'edto the store , it ain't getting updated when store changes for svgArr.
我正在从某个其他组件分派一个操作，并且 store 正在使用svgArr属性进行更新，但是尽管以下无状态组件connect'ed到 store ，但当 store 更改为 时它不会更新svgArr。
Is it how it suppose to behave as it's a stateless component ? Or am I doing something wrong ?
它是一个无状态组件的行为方式吗？还是我做错了什么？
const Layer = (props) => {
console.log(props.svgArr);
return (<div style = {
{
width: props.canvasWidth,
height: props.canvasWidth
}
}
className = {
styles.imgLayer
} > hi < /div>);
};
connect((state) => {
return {
svgArr: state.svgArr
};
}, Layer
);
export default Layer;
采纳答案by Thank you
Here's a rewrite of your code
这是你的代码的重写
import {connect} from 'react-redux';
// this should probably not be a free variable
const styles = {imgLayer: '???'};
const _Layer = ({canvasWidth}) => (
<div className={styles.imgLayer}
style={{
width: canvasWidth,
height: canvasWidth
}}
children="hi" />
);
const Layer = connect(
state => ({
svgArr: state.svgArr
})
)(_Layer);
export default Layer;
回答by sunnyto
You seem to be exporting Layer instead of the connected version of the Layer component.
您似乎正在导出图层而不是图层组件的连接版本。
If you look at the redux documentation: https://github.com/reactjs/react-redux/blob/master/docs/api.md#inject-dispatch-and-todos
如果您查看 redux 文档：https: //github.com/reactjs/react-redux/blob/master/docs/api.md#inject-dispatch-and-todos
It should be something like
它应该是这样的
function mapStateToProps(state) {
return {svgArr: state.svgArr}
}
export default connect(mapSTateToProps)(Layer)回答by Hymankobec
If you want to connect the stateless function you should wrap it into the another const:
如果你想连接无状态函数，你应该把它包装到另一个常量中：
const Layer = (props) => {
return (
<div >
</div>
);
};
export const ConnectedLayer = connect(mapStateToProps)(Layer);
