Reactjs TypeScript-我应该如何键入这些组件?
假设我有两个项目:A和B。这些项目有不同的选项。我想创建一个表单,允许我从两个项目中选择一个并设置该项目的选项。当我设置完选项后,我希望有一个处理程序来处理保存的选项 我无法正确键入它,因为A和B的选项不相交,所以当我将选项传递到特定的item form组件时,它会给我一个TypeScript错误 我将如何着手解决这个问题,或者更好地说,我将如何修改解决这个问题的方法 我在这里创建了一个示例应用程序: 错误类型“Options”不能分配给类型“OptionsA&OptionsB”。发生在此行中Reactjs TypeScript-我应该如何键入这些组件?,reactjs,typescript,forms,Reactjs,Typescript,Forms,假设我有两个项目:A和B。这些项目有不同的选项。我想创建一个表单,允许我从两个项目中选择一个并设置该项目的选项。当我设置完选项后,我希望有一个处理程序来处理保存的选项 我无法正确键入它,因为A和B的选项不相交,所以当我将选项传递到特定的item form组件时,它会给我一个TypeScript错误 我将如何着手解决这个问题,或者更好地说,我将如何修改解决这个问题的方法 我在这里创建了一个示例应用程序: 错误类型“Options”不能分配给类型“OptionsA&OptionsB”。发生在此行中
<Form options={options} setOptions={setOptions} />
这是主要的表单创建者:
import React, { useState, FC, useEffect } from "react";
import { OptionsAForm, OptionsA, defaultOptionsA } from "./OptionsAForm";
import { OptionsBForm, OptionsB, defaultOptionsB } from "./OptionsBForm";
type Options = OptionsA | OptionsB;
export const ItemCreator: FC = () => {
const [item, setItem] = useState<string>("A");
const [options, setOptions] = useState<Options>(defaultOptionsA);
useEffect(() => {
if (item === "A") {
setOptions(defaultOptionsA);
} else if (item === "B") {
setOptions(defaultOptionsB);
}
}, [item]);
let Form;
if (item === "A") {
Form = OptionsAForm;
} else if (item === "B") {
Form = OptionsBForm;
}
const handleSubmit = () => {
// do stuff with Options here
console.log(options);
};
return (
<div style={{ display: "flex", flexDirection: "column" }}>
<select value={item} onChange={(e) => setItem(e.target.value)}>
<option value="" disabled>
Select an item
</option>
<option value="A">A</option>
<option value="B">B</option>
</select>
{Form && options != null && (
<Form options={options} setOptions={setOptions} />
)}
<button onClick={handleSubmit}>Submit</button>
</div>
);
};
这些是选项的表格
import React, { FC } from "react";
export const defaultOptionsA: OptionsA = {
name: "",
color: ""
};
export interface OptionsA {
name: string;
color: string;
}
interface FormProps {
setOptions: (options: OptionsA) => void;
options: OptionsA;
}
export const OptionsAForm: FC<FormProps> = ({ options, setOptions }) => {
return (
<>
<input
placeholder="Name"
value={options.name}
onChange={(e) => setOptions({ ...options, name: e.target.value })}
/>
<input
placeholder="Color"
value={options.color}
onChange={(e) => setOptions({ ...options, color: e.target.value })}
/>
</>
);
};
更新了ItemCreator.tsx文件,添加了泛型类型选项
将有趣的代码直接放入您的问题中。我们不应该链接到其他网站-这可能会腐烂-来获取有趣的信息。我已经用相关的代码更新了我的帖子。另外,你必须使用useReducer,因为,您有相关的状态项=>一个useState中的选定项和另一个useState中的相应选项这些更新不会在ItemCreator componentAdd console.logoptions中批量更新;在这两个表单文件的函数content=>中,当您切换所选项目时,您将在控制台中看到一个错误check this:P.s.这个解决方案仍然可以通过使用泛型来改进。但是,我尝试尽可能少地重构。但是,如果您继续这样做,请让我知道,如果您愿意,我将使用useReducer删除一个示例代码,因为这应该是处理此场景中状态的正确方法,而不会由于部分状态更新而导致错误
import React, { FC } from "react";
export const defaultOptionsB: OptionsB = {
name: "",
weight: 0
};
export interface OptionsB {
name: string;
weight: number;
}
interface FormProps {
setOptions: (options: OptionsB) => void;
options: OptionsB;
}
export const OptionsBForm: FC<FormProps> = ({ options, setOptions }) => {
return (
<>
<input
placeholder="Name"
value={options.name}
onChange={(e) => setOptions({ ...options, name: e.target.value })}
/>
<input
type="number"
placeholder="weight"
value={options.weight}
onChange={(e) =>
setOptions({ ...options, weight: parseInt(e.target.value, 10) })
}
/>
</>
);
};
import React, { useState, FC, useEffect } from "react";
import { OptionsAForm, OptionsA, defaultOptionsA } from "./OptionsAForm";
import { OptionsBForm, OptionsB, defaultOptionsB } from "./OptionsBForm";
type OptionTypes = "A" | "B";
interface OptionsMap {
A: OptionsA;
B: OptionsB;
}
type Options<T = OptionTypes> = T extends OptionTypes ? OptionsMap[T] : null;
const isObjectEmpty = (obj: Record<string, any>) =>
Object.keys(obj).length === 0;
export const ItemCreator: FC = () => {
const [item, setItem] = useState<OptionTypes | "">("");
const [options, setOptions] = useState<Options | {}>({});
useEffect(() => {
if (item === "A") {
setOptions(defaultOptionsA);
} else if (item === "B") {
setOptions(defaultOptionsB);
}
}, [item]);
const handleSubmit = () => {
// do stuff with Options here
console.log(options);
};
return (
<div style={{ display: "flex", flexDirection: "column" }}>
<select
value={item}
onChange={(e) => setItem(e.target.value as OptionTypes)}
>
<option value="" disabled>
Select an item
</option>
<option value="A">A</option>
<option value="B">B</option>
</select>
{item === "A" && !isObjectEmpty(options) && (
<OptionsAForm
options={options as Options<"A">}
setOptions={setOptions}
/>
)}
{item === "B" && !isObjectEmpty(options) && (
<OptionsBForm
options={options as Options<"B">}
setOptions={setOptions}
/>
)}
<button onClick={handleSubmit}>Submit</button>
</div>
);
};
import React, { FC } from "react";
import { OptionsAForm, OptionsA, defaultOptionsA } from "./OptionsAForm";
import { OptionsBForm, OptionsB, defaultOptionsB } from "./OptionsBForm";
type OptionTypes = "A" | "B";
interface OptionsMap {
A: OptionsA;
B: OptionsB;
}
type Options<T = OptionTypes> = T extends OptionTypes ? OptionsMap[T] : null;
const isObjectEmpty = (obj: Record<string, any>) =>
Object.keys(obj).length === 0;
type Action =
| {
type: "SET_ITEM";
item: OptionTypes;
}
| {
type: "SET_OPTIONS";
options: Options;
};
interface IState {
item: OptionTypes | "";
options: Options | {};
}
const initialState: IState = {
item: "",
options: {}
};
function reducer(state: IState, action: Action): IState {
switch (action.type) {
case "SET_ITEM": {
const { item } = action;
return {
...state,
item,
options: item === "A" ? defaultOptionsA : defaultOptionsB
};
}
case "SET_OPTIONS": {
return {
...state,
options: action.options
};
}
default:
return state;
}
}
export const ItemCreator: FC = () => {
const [state, dispatch] = React.useReducer(reducer, initialState);
const { item, options } = state;
const setItem = (selectedItem: OptionTypes) =>
dispatch({ type: "SET_ITEM", item: selectedItem });
const setOptions = (options: Options) =>
dispatch({ type: "SET_OPTIONS", options });
const handleSubmit = () => {
// do stuff with Options here
console.log(options);
};
return (
<div style={{ display: "flex", flexDirection: "column" }}>
<select
value={item}
onChange={(e) => setItem(e.target.value as OptionTypes)}
>
<option value="" disabled>
Select an item
</option>
<option value="A">A</option>
<option value="B">B</option>
</select>
{item === "A" && !isObjectEmpty(options) && (
<OptionsAForm
options={options as Options<"A">}
setOptions={setOptions}
/>
)}
{item === "B" && !isObjectEmpty(options) && (
<OptionsBForm
options={options as Options<"B">}
setOptions={setOptions}
/>
)}
<button onClick={handleSubmit}>Submit</button>
</div>
);
};