我真是ReactJs的新手。我知道这是一个基本问题,但是我无法通过单选按钮触发事件。在我的网页中,我有两个用于显示性别信息的单选按钮。这些单选按钮的名称相同。
当用户单击单选按钮时,我要设置我的状态值。我尝试了Web中提到的所有解决方案,但无法设置性别值。
import React, { Component } from 'react'
import PropTypes from 'prop-types'
class App extends Component {
constructor(props) {
super(props)
this.renderGender = this.renderGender.bind(this)
this.setGender = this.setGender.bind(this)
this.state = {
loading: false,
error: false,
form: {},
gender: 'male'
}
}
setGender(e) {
this.setState({
gender: e.target.value
})
}
render() {
return (
<div className="container main">
{this.state.error ? (
<div className="alert alert-danger" role="alert">
Error
</div>
) : null}
<div className="row form-container">
<div className="col-md-7">
<div className="jumbotron jumbotron-fluid">
<div className="container">. . .</div>
</div>
</div>
<div className="col-md-5">
<form id="register-form" method="POST" onSubmit={this.onSubmit} autoComplete="off">
<input type="hidden" autoComplete="off" disabled />
{this.renderGender()}
</form>
</div>
</div>
</div>
)
}
renderGender() {
return (
<div>
<label htmlFor="">Gender</label>
<input type="radio" onClick={this.setGender} value="FEMALE" defaultChecked name="gender" /> Female
<input type="radio" onClick={this.setGender} value="MALE" name="gender" /> Male
</div>
)
}
}
App.propTypes = {}
export default App
当用户单击单选按钮时,不会调用我的setGender方法。此代码中我的错误是什么?
答案 0 :(得分:1)
在输入单选按钮中将onClick更改为onChange
例如:更改
<input type="radio" onClick={this.setGender} value="FEMALE" defaultChecked name="gender" />
收件人
<input type="radio" onChange={this.setGender} value="FEMALE" defaultChecked name="gender" />
答案 1 :(得分:1)
如果要将性别的状态变量保存为整数,则可以处理 在handleChange()函数中,如下所示:
import React from "react";
import ReactDOM from "react-dom";
class App extends React.Component {
constructor() {
super();
this.state = {
gender: ""
};
this.handleChange = this.handleChange.bind(this);
}
handleChange(event) {
const { name, value } = event.target;
this.setState({ [name]: value === "male" ? 1 : 0 });
}
render() {
const GENDER_TYPE = {
1: "male",
0: "female"
};
return (
<div className="App">
<h1>Radio batton example</h1>
<label>
<input
type="radio"
name="gender"
value="male"
checked={this.state.gender === 1}
onChange={this.handleChange}
/>{" "}
Male
</label>
<br />
<label>
<input
type="radio"
name="gender"
value="female"
checked={this.state.gender === 0}
onChange={this.handleChange}
/>{" "}
Female
</label>
<p>Chosen gender: {GENDER_TYPE[this.state.gender]}</p>
</div>
);
}
}
ReactDOM.render(<App />, document.getElementById("root"));
因此,单选按钮标记的值仍然为“ male”和“ female”,但在handleChange()函数中转换为整数,并将其保存为整数。
实时示例: