Reactjs 用泛型来反应上下文
如何在React.CreateContext中使用泛型 我有这个:Reactjs 用泛型来反应上下文,reactjs,typescript,generics,react-context,Reactjs,Typescript,Generics,React Context,如何在React.CreateContext中使用泛型 我有这个: interface Props { } export interface SearchContextProps { dtos: any[]; } export const SearchContext = React.createContext<SearchContextProps>({ dtos: [] }); const SearchPage: React.FunctionComponent<P
interface Props {
}
export interface SearchContextProps {
dtos: any[];
}
export const SearchContext = React.createContext<SearchContextProps>({
dtos: []
});
const SearchPage: React.FunctionComponent<Props> = (props) => {
const [dtos, setDtos] = React.useState<any[]>([]);
const searchContext = {
dtos: dtos
};
return (
<SearchContext.Provider value={searchContext}>
...
</SearchContext.Provider>
);
}
export default SearchPage;
界面道具{
}
导出接口SearchContextProps{
DTO:任何[];
}
export const SearchContext=React.createContext({
DTO:[]
});
const SearchPage:React.FunctionComponent=(道具)=>{
const[dtos,setDtos]=React.useState([]);
const searchContext={
dtos:dtos
};
返回(
...
);
}
导出默认搜索页面;
现在我想使用泛型,所以我会写一些类似的东西:
interface Props<T> {
}
export interface SearchContextProps<T> {
dtos: T[];
}
export const SearchContext = React.createContext<SearchContextProps<T>>({
dtos: []
});
const SearchPage = <T extends object>(props: Props<T>) => {
const [dtos, setDtos] = React.useState<T[]>([]);
const searchContext = {
dtos: dtos
};
return (
<SearchContext.Provider value={searchContext}>
...
</SearchContext.Provider>
);
}
export default SearchPage;
界面道具{
}
导出接口SearchContextProps{
dtos:T[];
}
export const SearchContext=React.createContext({
DTO:[]
});
const SearchPage=(道具:道具)=>{
const[dtos,setDtos]=React.useState([]);
const searchContext={
dtos:dtos
};
返回(
...
);
}
导出默认搜索页面;
但我不知道我该如何去工作:
export const SearchContext = React.createContext<SearchContextProps<T>>({
export const SearchContext=React.createContext({
我如何在这里使用泛型,如何访问T
我尝试在组件内移动上下文:
interface Props<T> {
}
export interface SearchContextProps<T> {
dtos: T[];
}
const SearchPage = <T extends object>(props: Props<T>) => {
const [dtos, setDtos] = React.useState<T[]>([]);
const SearchContext = React.createContext<SearchContextProps<T>>({
dtos: [],
});
const searchContext = {
dtos: dtos,
};
return (
<SearchContext.Provider value={searchContext}>
...
</SearchContext.Provider>
);
}
export default SearchPage;
界面道具{
}
导出接口SearchContextProps{
dtos:T[];
}
const SearchPage=(道具:道具)=>{
const[dtos,setDtos]=React.useState([]);
const SearchContext=React.createContext({
DTO:[],
});
const searchContext={
dtos:dtos,
};
返回(
...
);
}
导出默认搜索页面;
但现在我不知道如何出口它
有什么帮助吗?我最终得到了:
import * as React from 'react';
interface Props<T> {}
export interface SearchContextProps<T> {
dtos: T[];
}
export const SearchContext = React.createContext<SearchContextProps<any>>({
dtos: [],
});
const SearchPage = <T extends object>(props: React.PropsWithChildren<Props<T>>) => {
const [dtos, setDtos] = React.useState<T[]>([]);
const searchContext = {
dtos: dtos,
};
return <SearchContext.Provider value={searchContext}>...</SearchContext.Provider>;
};
export default SearchPage;
import*as React from'React';
接口道具{}
导出接口SearchContextProps{
dtos:T[];
}
export const SearchContext=React.createContext({
DTO:[],
});
const SearchPage=(props:React.PropsWithChildren)=>{
const[dtos,setDtos]=React.useState([]);
const searchContext={
dtos:dtos,
};
返回。。。;
};
导出默认搜索页面;
以及消费者
const searchContext = React.useContext<SearchContextProps<Interfaces.FileDto>>(SearchContext)
const searchContext=React.useContext(searchContext)
我也尝试了一段时间,终于用我正在构建atm的向导解决了这个问题
提供程序部分与您的类似:
import React, { Dispatch, SetStateAction } from "react";
export interface IWizardContext<T> {
formData: T;
setFormData: Dispatch<SetStateAction<T>>;
}
export const WizardContext = React.createContext<IWizardContext<any>>({
formData: {},
setFormData: () => {},
});
const WizardProvider: React.FC = (props) => {
const [formData, setFormData] = React.useState<any>({});
return (
<WizardContext.Provider
value={{
formData: formData,
setFormData: setFormData,
}}
>
{props.children}
</WizardContext.Provider>
);
};
export default WizardProvider;
export function withWizardProvider<TProps = {}>(component: React.FC<TProps>) {
const Component = component;
return ((props: TProps) => {
return (
<WizardProvider>
<Component {...props} />
</WizardProvider>
);
}) as React.FC<TProps>;
}
import React,{Dispatch,SetStateAction}来自“React”;
导出接口IWizardContext{
formData:T;
setFormData:调度;
}
导出常量向导上下文=React.createContext({
formData:{},
setFormData:()=>{},
});
常量向导提供程序:React.FC=(道具)=>{
const[formData,setFormData]=React.useState({});
返回(
{props.children}
);
};
导出默认向导提供程序;
使用WizardProvider导出函数(组件:React.FC){
常数分量=分量;
返回((道具:TProps)=>{
返回(
);
})as.FC;
}
消费者:
import React from "react";
import {
IWizardContext,
withWizardProvider,
WizardContext,
} from "./WizardProvider";
interface ISampleWizardState {
name?: string;
lastName?: string;
}
const SampleWizard: React.FC = (props) => {
const wizard = React.useContext<IWizardContext<ISampleWizardState>>(
WizardContext
);
return (
<div
style={{
display: "flex",
justifyContent: "flex-start",
flexDirection: "column",
}}
>
<span>{`${wizard.formData.name || "John"} ${
wizard.formData.lastName || "Doe"
}`}</span>
<input
type="text"
name="name"
value={wizard.formData.name}
onChange={(e) => {
const text = e?.target?.value;
wizard.setFormData((prev) => ({
...prev,
name: text,
}));
}}
/>
<input
type="text"
name="lastName"
value={wizard.formData.lastName}
onChange={(e) => {
const text = e?.target?.value;
wizard.setFormData((prev) => ({
...prev,
lastName: text,
}));
}}
/>
</div>
);
};
export default withWizardProvider(SampleWizard);
从“React”导入React;
进口{
IWizardContext,
使用向导提供程序,
WizardContext,
}来自“/WizardProvider”;
接口是简单的向导状态{
名称?:字符串;
lastName?:字符串;
}
const SampleWizard:React.FC=(道具)=>{
const wizard=React.useContext(
向导上下文
);
返回(
{`${wizard.formData.name | |“John”}${
wizard.formData.lastName | |“Doe”
}`}
{
常量文本=e?目标?值;
wizard.setFormData((上一个)=>({
…上一页,
名称:文本,
}));
}}
/>
{
常量文本=e?目标?值;
wizard.setFormData((上一个)=>({
…上一页,
姓氏:text,
}));
}}
/>
);
};
使用向导提供程序导出默认值(SampleWizard);
因此,消费者的主要任务是在useContext中定义您的T:
React.useContext<IWizardContext<ISampleWizardState>>(WizardContext);
React.useContext(向导上下文);
Hi Simone,我目前正在处理同一主题。你找到解决方案了吗?是的,请看我自己的答案。你能添加SearchContext.Consumer?React.useContext(SearchContext)的示例吗