我在我的小型项目中创建了多个复选框。我在给复选标记的同时检索复选框的信息时遇到问题。如果我在玩具上打上勾号,则该值应为toys
,或者如果我在toys
和lights
上打勾,则应该在控制台中同时获得玩具和灯光。
这是代码:
import React from "react";
import { render } from "react-dom";
import { Segment, Form, Checkbox, Button } from "semantic-ui-react";
import axios from "axios";
export default class ShowForm extends React.Component {
constructor(props) {
super(props);
this.state = {
event: ""
};
}
handleCheck = event => {
console.log("Hello", event);
};
render() {
return (
<div>
<Segment>
<Form>
<Checkbox label="Cake" onChange={this.handleCheck} />
<br />
<Checkbox label="Lights" onChange={this.handleCheck} />
<br />
<Checkbox label="Flowers" onChange={this.handleCheck} />
<br />
<Checkbox label="Toys" onChange={this.handleCheck} />
<br />
<Button onClick={this.handleSubmit}> Submit </Button>
</Form>
</Segment>
</div>
);
}
}
这是完整的代码:“ https://codesandbox.io/s/zealous-paper-p9zb5”
谁能帮我解决这个问题?
最佳答案
您需要一个数组来存储所有检查的状态。
handleCheck = id => () => { // Get indentify from each element
const { checkedList } = this.state;
const result = checkedList.includes(id) // Check if checked at this moment
? checkedList.filter(x => x !== id) // If checked, remove
: [...checkedList, id]; // If not, add
this.setState({ checkedList: result }, () => { // setState
console.log(this.state.checkedList); // setState is async, log in callback
});
};
并且,如果需要,可以将
Checkbox
组件设为通用组件,这样就不必将label
分别绑定在三个地方。<Checkbox
label="Cake"
onChange={this.handleCheck("Cake")}
checked={checkedList.includes("Cake")} // If included, checked
/>
另一个最小的可复制演示
在文本中尝试:
const list = [...Array(10).keys()].map(x => ({ id: x }));
const App = () => {
const [selected, setSelected] = React.useState([]);
const onChangeHandler = id => () => {
selected.includes(id)
? setSelected(selected.filter(x => x !== id))
: setSelected([...selected, id]);
};
const onRemove = () => {
setSelected([]);
};
return (
<div className="App">
{list.map(item => (
<input
type="checkbox"
key={item.id}
checked={selected.includes(item.id)}
onChange={onChangeHandler(item.id)}
/>
))}
<br />
<button onClick={onRemove}>Remove all</button>
<div>{selected.join(",")}</div>
</div>
);
}
ReactDOM.render(<App />, document.getElementById("root"));
<div id="root"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.12.0/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.12.0/umd/react-dom.production.min.js"></script>