Reactjs 将useState的状态分配给文本类型(HTMLSelectElement)时出现问题
我正在用typescript和react钩子构建一个todo应用程序,并尝试添加一个过滤器功能来显示“所有任务”、“完成”或“待完成”的任务。我试图在这里使用文字类型,但它给了我错误 /组件/Sort.tsx:Reactjs 将useState的状态分配给文本类型(HTMLSelectElement)时出现问题,reactjs,typescript,react-hooks,jsx,tsx,Reactjs,Typescript,React Hooks,Jsx,Tsx,我正在用typescript和react钩子构建一个todo应用程序,并尝试添加一个过滤器功能来显示“所有任务”、“完成”或“待完成”的任务。我试图在这里使用文字类型,但它给了我错误 /组件/Sort.tsx: import * as React from 'react'; interface SortProps { SelectByDone: (event: React.ChangeEvent<HTMLSelectElement>)=> void; Sele
import * as React from 'react';
interface SortProps {
SelectByDone: (event: React.ChangeEvent<HTMLSelectElement>)=> void;
SelectSortMethod: (event: React.ChangeEvent<HTMLSelectElement>)=> void;
}
const Sort: React.FunctionComponent<SortProps> = ({SelectByDone, SelectSortMethod}) => {
return (
<>
<label >Sort by:</label>
**<select onChange={SelectByDone}>
<option value="All Task">All Task</option>
<option value="Done">Done</option>
<option value="To Do">To Do</option>
</select>**
<select onChange={SelectSortMethod}>
<option value="Date Added">Date Added</option>
<option value="Due">Due</option>
<option value="Caption">Caption</option>
</select>
</>
);
};
export default Sort;
import*as React from'React';
接口排序程序{
SelectByDone:(事件:React.ChangeEvent)=>void;
SelectSortMethod:(事件:React.ChangeEvent)=>void;
}
常量排序:React.FunctionComponent=({SelectByDone,SelectSortMethod})=>{
返回(
排序方式:
**
所有任务
多恩
做
**
添加日期
应得的
说明文字
);
};
导出默认排序;
我认为选项值应该只给出“所有任务”/“完成”/“待完成”
然后将在my Topbar.tsx中呈现:
import * as React from 'react';
import Sort from './Sort';
import SearchBar from './SearchBar';
interface TopBarProps {
SelectByDone: (event: React.ChangeEvent<HTMLSelectElement>)=> void;
SelectSortMethod: (event: React.ChangeEvent<HTMLSelectElement>)=> void;
onSearchChange: (event: React.ChangeEvent<HTMLInputElement>) => void;
}
const TopBar: React.FunctionComponent<TopBarProps> = ({SelectByDone,SelectSortMethod,onSearchChange}) => {
return (
<>
<Sort SelectByDone={SelectByDone} SelectSortMethod={SelectSortMethod} />
<SearchBar onSearchChange={onSearchChange} />
</>
);
};
export default TopBar;
/组件/Topbar.tsx:
import * as React from 'react';
import Sort from './Sort';
import SearchBar from './SearchBar';
interface TopBarProps {
SelectByDone: (event: React.ChangeEvent<HTMLSelectElement>)=> void;
SelectSortMethod: (event: React.ChangeEvent<HTMLSelectElement>)=> void;
onSearchChange: (event: React.ChangeEvent<HTMLInputElement>) => void;
}
const TopBar: React.FunctionComponent<TopBarProps> = ({SelectByDone,SelectSortMethod,onSearchChange}) => {
return (
<>
<Sort SelectByDone={SelectByDone} SelectSortMethod={SelectSortMethod} />
<SearchBar onSearchChange={onSearchChange} />
</>
);
};
export default TopBar;
import*as React from'React';
从“./Sort”导入排序;
从“./SearchBar”导入搜索栏;
接口TopBarProps{
SelectByDone:(事件:React.ChangeEvent)=>void;
SelectSortMethod:(事件:React.ChangeEvent)=>void;
onSearchChange:(事件:React.ChangeEvent)=>void;
}
const TopBar:React.FunctionComponent=({SelectByDone,SelectSortMethod,onSearchChange})=>{
返回(
);
};
导出默认顶栏;
这是我的index.tsx:
import React, {useState} from "react";
import ReactDOM from "react-dom";
import TopBar from '../components/TopBar';
import TodosTable from '../components/TodosTable';
type DoneState = 'All Task' | 'Done' | 'To Do';
//...
const App = () => {
const [doneState, setDoneState] = useState<DoneState>('All Task')
const [searchText, setSearchText] = useState<string>('')
const selectByDone = (option: React.FormEvent<HTMLSelectElement>) => {
setDoneState(option.currentTarget.value);
}
// 'option.currentTarget.value' is underlined and gives error:
// Argument of type 'string' is not assignable to parameter of type 'SetStateAction<DoneState>'.
// (property) HTMLSelectElement.value: string
// Sets or retrieves the value which is returned to the server when the form control is submitted.
const onSearchChange = (event: React.FormEvent<HTMLInputElement>) => {
setSearchText(event.currentTarget.value);
}
//This works however
//...
return (
<>
<TopBar SelectByDone={selectByDone} SelectSortMethod={selectSortMethod} onSearchChange={onSearchChange} />
<TodosTable SelectByDoneState={doneState} SelectSortMethodState={sortMethodState} SearchText={searchText} TodosArray={todosArray} />
{//<AddTodoModal/>
}
</>
);
};
ReactDOM.render(
<App />,
document.getElementById("root")
);
import React,{useState}来自“React”;
从“react dom”导入react dom;
从“../components/TopBar”导入TopBar;
从“../components/TodosTable”导入TodosTable;
键入DoneState='All Task'|'Done'|'To Do';
//...
常量App=()=>{
const[donstate,setdonstate]=useState(“所有任务”)
常量[searchText,setSearchText]=useState(“”)
const selectByDone=(选项:React.FormEvent)=>{
setDoneState(option.currentTarget.value);
}
//“option.currentTarget.value”带下划线,并给出错误:
//“string”类型的参数不能分配给“SetStateAction”类型的参数。
//(属性)HTMLSelectElement.value:字符串
//设置或检索提交表单控件时返回给服务器的值。
const onSearchChange=(事件:React.FormEvent)=>{
setSearchText(event.currentTarget.value);
}
//然而,这是可行的
//...
返回(
{//
}
);
};
ReactDOM.render(
,
document.getElementById(“根”)
);
如何正确地将其分配给我的文字类型?我应该使用枚举吗?我应该为此(typescript-github页面)签出什么资源
多谢各位
编辑:感谢您的排版修复,但是仍然有一个错误,当所有任务都已定义时,您的界面上未定义所有任务。您应该像这样键入cast
const selectByDone = (option: React.FormEvent<HTMLSelectElement>) => {
setDoneState(option.currentTarget.value as DoneState);
}
const selectByDone=(选项:React.FormEvent)=>{
setDoneState(option.currentTarget.value作为DoneState);
}
option.currentTarget.value是字符串类型,无法分配给DoneState。
所有任务
不是DoneState的一部分,但所有任务
都是。