Javascript 将值从窗体传递到另一个组件
我有一个表单组件,有三个输入字段,当表单提交时,这些值应该传递给Results组件。当我提交什么都没有发生时,它们会打印在控制台上,但不会打印在结果组件上 在ResultsJS组件中,我尝试传递道具,但什么也没有发生,没有错误消息。有人能识别我的代码中缺少了什么吗 谢谢大家! APp.jsJavascript 将值从窗体传递到另一个组件,javascript,reactjs,web-applications,frontend,Javascript,Reactjs,Web Applications,Frontend,我有一个表单组件,有三个输入字段,当表单提交时,这些值应该传递给Results组件。当我提交什么都没有发生时,它们会打印在控制台上,但不会打印在结果组件上 在ResultsJS组件中,我尝试传递道具,但什么也没有发生,没有错误消息。有人能识别我的代码中缺少了什么吗 谢谢大家! APp.js import React, { Component } from 'react'; import Form from './components/Form'; import Results from './c
import React, { Component } from 'react';
import Form from './components/Form';
import Results from './components/Results';
import './App.css';
class App extends Component {
state = {
title: '',
author: '',
isbn: ''
}
render() {
//const {title, author, isbn} = this.state;
return (
<React.Fragment>
<div className="container">
<Form />
<Results
title={this.state.title}
author={this.state.author}
isbn={this.state.isbn}
/>
</div>
</React.Fragment>
);
}
}
export default App;
import React,{Component}来自'React';
从“./components/Form”导入表单;
从“./components/Results”导入结果;
导入“/App.css”;
类应用程序扩展组件{
状态={
标题:“”,
作者:'',
isbn:'
}
render(){
//const{title,author,isbn}=this.state;
返回(
);
}
}
导出默认应用程序;
Form.js:
import React, { Component } from 'react';
class Form extends Component {
constructor(props){
super(props);
this.state = {
title: '',
author: '',
isbn: '',
}
this.onChangeHandler = this.onChangeHandler.bind(this);
this.handleSubmit = this.handleSubmit.bind(this);
}
handleSubmit = (e) => {
e.preventDefault();
//const {title, author, isbn} = this.state;
console.log('Title: ' + this.state.title);
console.log('Author: ' + this.state.author);
console.log('ISBN: ' + this.state.isbn);
}
onChangeHandler = (e) => {
//const {title, author, isbn} = e.target;
this.setState({
[e.target.name]: e.target.value
})
}
render() {
return (
<div>
<div className="container mt-4">
<h1 className="display-4 text-center">
My<span className="text-primary">Book</span>List
</h1>
<form onSubmit={this.handleSubmit}>
<div className="form-group">
<label htmlFor="title">Title</label>
<input
type="text"
className="form-control"
name="title"
value={this.state.title}
onChange={this.onChangeHandler} />
</div>
<div className="form-group">
<label htmlFor="author">Author</label>
<input
type="text"
className="form-control"
name="author"
value={this.state.name}
onChange={this.onChangeHandler} />
</div>
<div className="form-group">
<label htmlFor="isbn">ISBN#</label>
<input
type="text"
className="form-control"
name="isbn"
value={this.state.name}
onChange={this.onChangeHandler} />
</div>
<input
type="submit"
value="Add Book"
className="btn btn-primary btn-block"
/>
</form>
</div>
</div>
)
}
}
export default Form;
import React,{Component}来自'React';
类形式扩展组件{
建造师(道具){
超级(道具);
此.state={
标题:“”,
作者:'',
isbn:“,
}
this.onChangeHandler=this.onChangeHandler.bind(this);
this.handleSubmit=this.handleSubmit.bind(this);
}
handleSubmit=(e)=>{
e、 预防默认值();
//const{title,author,isbn}=this.state;
console.log('Title:'+this.state.Title);
console.log('Author:'+this.state.Author);
console.log('ISBN:'+this.state.ISBN);
}
onChangeHandler=(e)=>{
//const{title,author,isbn}=e.target;
这是我的国家({
[e.target.name]:e.target.value
})
}
render(){
返回(
我的书单
标题
著者
ISBN#
)
}
}
导出默认表单;
Results.js
import React from 'react';
const Results = (props) => {
console.log(props);
return (
<div>
<h3>Results</h3>
<p>{props.title}</p>
<p>{props.author}</p>
<p>{props.isbn}</p>
</div>
);
}
export default Results;
从“React”导入React;
常量结果=(道具)=>{
控制台日志(道具);
报税表(
后果
{props.title}
{props.author}
{props.isbn}
);
}
导出默认结果;
您需要将值从表单
传递给其父级,以便父级可以设置结果
属性,以下是您的方法
class App extends Component {
....
onFormSubmit = (author, title, isbn) => {
this.setState({title, author, isbn});
}
render() {
return (
....
<Form onFormSubmit={this.onFormSubmit}/>
....
);
}
}
class Form extends Component {
....
handleSubmit = (e) => {
e.preventDefault();
const { author, title, isbn } = this.state;
this.props.onFormSubmit(author, title, isbn);
}
....
}
类应用程序扩展组件{
....
onFormSubmit=(作者、标题、isbn)=>{
this.setState({标题,作者,isbn});
}
render(){
返回(
....
....
);
}
}
类形式扩展组件{
....
handleSubmit=(e)=>{
e、 预防默认值();
const{author,title,isbn}=this.state;
此.props.onFormSubmit(作者、标题、isbn);
}
....
}