submit事件是在表单而不是输入上激发的。 因此,您需要在<section>中放置一个表单,并将处理程序绑定到该表单。然后您需要使用$("#name").val()来获取输入的值。 $(function() { $("#myform") .on("submit", function(e) { e.preventDefault(); var namenew = $("#name").val(); $("p.show")...
<form id="form"method="get">First name:<input type="text"value="Jake"name="fname">Last name:<input type="text"value="Ma"name="lname"><input type="submit"value="提交"></form> 当我们使用表单 form 元素时,内部的表单元素可以根据name属性与value值自动组合成一个完整的序列化表单对象。我们...
fileInput} /> </label> <br /> <button type="submit">Submit</button> </form> ); } } const root = ReactDOM.createRoot( document.getElementById('root') ); root.render(<FileInput />); 三、React新特性 3.1、render新的返回类型 React16之前render方法必须返回单个元素,现在render可以返回多种...
}, [counter])// 登录functionhandleSubmit() {// form 是 FormInstance。// getFieldsValue - 获取一组字段名对应的值,会按照对应结构返回constformData = form.getFieldsValue();// 如果显示了“验证码”却没有输入,提示if(codeVisible && !formData.captcha)returnmessage.error('请输入验证码');// 登录...
functionChangeName({currentName, onUpdateName}){const[optimisticName, setOptimisticName]=useOptimistic(currentName);constsubmitAction=asyncformData=>{const newName = formData.get("name");setOptimisticName(newName);const updatedName =awaitupdateName(newName);onUpdateName(updatedName);};return(<form ...
<button onClick={this.handleClick} type="submit">新增</button> </div> </div>) } } 在UserListContainer中添加onAddUser参数与函数: import React, { Component } from 'react'import UserList from'./UserList'exportdefaultclass UserListContainer extends Component { ...
```jsxconstUncontrolledForm = () => {constinputRef = React.createRef();consthandleSubmit = (event) => {event.preventDefault();alert(inputRef.current.value);};return(<form onSubmit={handleSubmit}><input type="text"ref={inputRef}...
npm install react-hook-form Quickstart import{useForm}from'react-hook-form';functionApp(){const{register,handleSubmit,formState:{errors},}=useForm();return(<formonSubmit={handleSubmit((data)=>console.log(data))}><input{...register('firstName')}/><input{...register('lastName',{required:...
functionChangeName(){const[name,setName]=useState("");// 定义乐观更新的状态const[optimisticName,setOptimisticName]=useOptimistic(name);constsubmitAction=async(formData)=>{constnewName=formData.get("name");// 请求之前,先把状态更新到 optimisticLikesetOptimisticName(newName);try{awaitupdateName(newNam...
FormEvent<HTMLFormElement>) => { // Prevent default browser page refresh. e.preventDefault(); // Get form data as an object. let data = Object.fromEntries(new FormData(e.currentTarget)); // Submit to your backend API... setSubmitted(data); }; return ( <Form onSubmit={onSubmit}> <...