如何从材质UI按钮组件访问主类功能?

Question

我想从 AddButton 中的 ToDo.js 文件中调用函数handleKeyPress().js以设置材质 UI 中按钮的操作onClick()。也许我应该以某种不同的方式为按钮设置点击操作？但是任何类型的进出口申报都对我不起作用。 我想了解一些函数访问规则，我是JS的新手( 请告诉我这里出了什么问题。

添加按钮.js

import React from 'react';
import PropTypes from 'prop-types';
import { withStyles } from '@material-ui/core/styles';
import Button from '@material-ui/core/Button';
import AddIcon from '@material-ui/icons/Add';
import {handleKey} from '../ToDo';
const styles = theme => ({
button: {
margin: theme.spacing.unit,
},
});
function FloatingActionButtons(props) {
const { classes } = props;
return (
<div>
<Button variant="fab" color="primary" aria-label="Add" className={classes.button} onClick={() => (handleKey)}>
<AddIcon />
</Button>
</div>
);
}
FloatingActionButtons.propTypes = {
classes: PropTypes.object.isRequired,
};
export default withStyles(styles)(FloatingActionButtons);

待办事项.js

import React, {Component} from 'react';
import './ToDo.css';
import ToDoItem from './components/ToDoItem';
import AppBar from './components/AppBar';
import AddButton from './components/AddButton';
import Logo from './assets/logo.png';
const appBar = <AppBar />
const addButton = <AddButton />
class ToDo extends Component {
constructor(props) {
super(props);
this.state = {
list: [
{
title: 'Cup cleaning',
todo: "Wash and take away the Kurzhiy's cup from WC"
},
{
title: 'Smoking rollton',
todo: 'Do some rollton and cigarettes'
},
{
title: 'Curious dream',
todo: 'Build a time machine'
}
],
title: '',
todo: ''
};
};
createNewToDoItem = () => {
this.setState(({ list, title, todo }) => ({
list: [
...list,
{
title,  
todo
}
],
title: '',
todo: ''
}));
};
handleKeyPress = e => {
if (e.target.value !== '') {
if (e.key === 'Enter') {
this.createNewToDoItem();
}
}
};
handleTitleInput = e => {
this.setState({
title: e.target.value,
});
};
handleTodoInput = e => {
this.setState({
todo: e.target.value
});
};
deleteItem = indexToDelete => {
this.setState(({ list }) => ({
list: list.filter((toDo, index) => index !== indexToDelete)
}));
};
editItem = (i, updTitle, updToDo) => {
let arr = this.state.list;
arr[i].title = updTitle;
arr[i].todo = updToDo;
this.setState ({list: arr});
};
eachToDo = (item, i) => {
return <ToDoItem
key={i}
title={item.title}
todo={item.todo}
deleteItem={this.deleteItem.bind(this, i)}
editItem={this.editItem.bind(this, i)}
/>
};
render() {
return (
<div className="ToDo">
<img className="Logo" src={Logo} alt="React logo"/>
<h1 className="ToDo-Header">{appBar}</h1>
<div className="ToDo-Container">
<div className="ToDo-Content">
{this.state.list.map(this.eachToDo)}
</div>
<div>
<input type="text" placeholder="Enter new title" value={this.state.title} onChange={this.handleTitleInput} onKeyPress={this.handleKeyPress}/>
<input type="text" placeholder="Enter new todo" value={this.state.todo} onChange={this.handleTodoInput} onKeyPress={this.handleKeyPress}/>
<button className="ToDo-Add" onClick={this.createNewToDoItem}>+</button>
<p>{addButton}</p>
</div>
</div>
</div>
);
}
}
export default ToDo;
export const handleKey = this.handleKeyPress;
console.log(handleKey)

Answer 1

你用这个来引用一个属性或一个方法而不是一个变量，所以你根本不应该在这里使用它。 其次，您必须先将handleKeyPress方法导入文件才能访问它，您确定该方法在此处const { classes } = props;吗？如果是，您应该将onclick={handleKeyPress((}指向一个函数，没有必要创建一个返回函数{类}而不是props的箭头函数，那么它应该可以工作