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[英]How are getState and dispatch imported in redux-thunk action creator?
[英]Redux-thunk: action creator automatically called
我有減速器:
import sliderInitialConfig from '../fixures';
export default (sliderConfig = sliderInitialConfig, action) => {
const {type, payload} = action;
switch(type) {
case "SELECT_CONFIG":
console.log(sliderConfig);
return sliderConfig.filter(item => item.id === payload);
default:
return sliderConfig;
}
}
我有動作創建者(使用redux-thunk)
export const selectConfig = (id) => dispatch => {
dispatch({type: "SELECT_CONFIG", payload: id})
};
我在使用AC的JSX代碼中有一部分。
{
sliderElements.map(item =>
<li
key={item.id}
className="btn"
onClick={this.props.selectConfig(item.id)}
>
{item.device}
</li>
)
}
因此,當我在瀏覽器中加載項目時,此AC將自動調用,而不是元素數組,而是收到空數組,如下所示:
{sliderElements: Array(4), fetchUser: ƒ, handleToken: ƒ, submitSurvey: ƒ, scrollMovement: ƒ, …}
sliderElements.js:7 (4) [{…}, {…}, {…}, {…}]0: {id: 1, device: "Apple iMac", image: "/static/media/mac_monitor.931c27aa.svg"}1: {id: 2, device: "Apple Macbook Pro", image: "/static/media/mackbook_pro.c9315d2b.png"}2: {id: 3, device: "MSI GP72VR 7RFX", image: "/static/media/iphone_X.bebbd7bc.jpg"}3: {id: 4, device: "Iphone X", image: "/static/media/msi_laptop.8190feed.jpg"}length: 4__proto__: Array(0)
sliderElements.js:7 [{…}]0: {id: 1, device: "Apple iMac", image: "/static/media/mac_monitor.931c27aa.svg"}length: 1__proto__: Array(0)
sliderElements.js:7 []
sliderElements.js:7 []
BlockFive.js:14 {sliderElements: Array(0), fetchUser: ƒ, handleToken: ƒ, submitSurvey: ƒ, scrollMovement: ƒ, …}
<li
key={item.id}
className="btn"
onClick={this.props.selectConfig(item.id)}
>
{item.device}
</li>
在這里,您正在調用 selectConfig函數。 您想將此函數傳遞給onClick屬性,但不調用它。 您還想定義要用作輸入值的值。 有兩種主要方法可以做到這一點;
咖喱;
getSelectConfig(id) => () => this.props.selectConfig(id) ... onClick={this.getSelectConfig(item.id)}
捆綁;
onClick={this.selectConfig.bind(this, item.id)}
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