我正在尝试运行一个简单的应用程序,该应用程序以数组的形式呈现我一生获得的不同昵称.
我总共有两个组件,pushMe组件作为子按钮,nameFinder作为父按钮.我试图将我的display()方法作为onClick事件传递到pushMe按钮组件中,但该按钮不会呈现任何结果.我试图找出我所缺少的.
import React from "react";
import ReactDOM from "react-dom";
import "./styles.css";
import { PushMe } from "../components/PushMe";
class MyName extends React.Component {
display() {
//This will keep constant range from 1-10.
var pickNickname = Math.floor(Math.random() * 11);
let alias = ["Terrence", "T", "TT", "Trey"];
let name;
//This conditional statement will decide the name by determining a number from a variable.
if (pickNickname <= 5) {
name = <h1>Today, my name is {alias[0]}</h1>;
} else if ((pickNickname = 6 || 7)) {
name = <h1> Today, my name is {alias[1]}</h1>;
} else if ((pickNickname = 8)) {
name = <h1> Today, my name is {alias[2]}</h1>;
} else {
name = <h1> Today, my name is {alias[3]}</h1>;
}
}
render() {
return (
<div className="myNameApp">
<PushMe display={this.display} />
</div>
);
}
}
ReactDOM.render(<MyName />, document.getElementById("root"));
import React from "react";
export class PushMe extends React.Component {
render() {
return <button onClick={this.props.display}> Push Me </button>;
}
}
解决方法:
按下按钮后,您需要在render方法中渲染结果.将值推入状态并呈现内容.还要绑定显示方法以访问正确的上下文,例如
import React from "react";
import ReactDOM from "react-dom";
import "./styles.css";
import { PushMe } from "../components/PushMe";
class MyName extends React.Component {
display = () => {
//This will keep constant range from 1-10.
var pickNickname = Math.floor(Math.random() * 11);
let alias = ["Terrence", "T", "TT", "Trey"];
let name;
//This conditional statement will decide the name by determining a number from a variable.
if (pickNickname <= 5) {
name = alias[0];
} else if ((pickNickname = 6 || 7)) {
name = alias[1]
} else if ((pickNickname = 8)) {
name = alias[2]
} else {
name = alias[3]
}
this.setState({name});
}
render() {
return (
<div className="myNameApp">
{this.state.name && <h1>Today, my name is {this.state.name}</h1>}
<PushMe display={this.display} />
</div>
);
}
}
ReactDOM.render(<MyName />, document.getElementById("root"));