用于数据绑定的一种方法useRef是将输入表单的值存储在currentref 的属性中。这允许您直接在表单和组件状态之间绑定数据，而无需使用事件处理程序：function InputForm() { const inputRef = useRef(null) const [value, setValue] = useState('') const handleSubmit = (event) => { event.preventDefault...
2 .媒体事件如果在捕获阶段进行事件委托,该事件的回调方法会被执行两次,和form的表现是一致的 React事件分类 1 .discreateEvent离散事件 1 .click,blur,focus,submit,touchstart等,优先级0 2 .UserblockingEvent用户阻塞事件:这些事件会阻塞用户的交互,优先级是1 1 .touchMove,mouseMove,scroll,drag,dragOveer 3 ....
classFormextendsComponent{handleSubmitClick=()=>{constname=this._name.value;// do something with `name`}render(){return(<div><input type="text"ref={input=>this._name=input}/><button onClick={this.handleSubmitClick}>Sign up</button></div>);}} In other words,you have to ‘pull’ th...
};//绑定上传的dateconst normFile = e => {//这个很重要,如果没有将上传失败并报错console.log('Upload event:', e);if(Array.isArray(e)) {returne; }returne &&e.fileList; }; class FormMonth extends React.Component{ constructor(props){ super(props)this.state={ } } formRef=React.createRe...
<option value="apple">apple</option> <option value="banana">banana</option> <option value="pear">pear</option> <option value="orange">orange</option> </select> <input type="submit" value="提交" /> </form> </div> ) } }
对象checkDelaynumber数据校验的时候,延迟处理,默认为 500 毫秒checkTriggerstring数据校验的触发类型,可选项: change、blur、null,默认为:changeonChangefunction(values:Object, event:Object)数据改变后的回调函数onErrorfunction(errors:Object)校验出错的回调函数onCheckfunction(errors:Object)数据校验的回调函数errors...
import{useState}from'react';importReactDOMfrom'react-dom/client';functionMyForm(){const[name,setName]=useState("");consthandleSubmit=(event)=>{event.preventDefault();alert(`The name you entered was:${name}`)}return(<formonSubmit={handleSubmit}><label>Enter your name:<inputtype="text"value...
import React, { Component } from 'react';class Form extends Component {constructor(props) {super(props);this.state = {username: '',password: ''};}handleInputChange = event => {const { name, value } = event.target;this.setState({[name]: value});};handleSubmit = event => {event....
首先,submit 事件只作用于 Form 元素,而且事件的触发者就是表单本身,并不是某个按钮,事件通过 submitter 属性来区分按钮或是元素。其次,submit 事件与多个属性有关,比如我们在 Form 上定义了 action 属性能过让表单提交到对应的地址,submit 按钮还有 formmethod,formenctype 等属性会影响提交行为。还有就是,通过 ...
<form onSubmit={this.handleSubmit}><inputtype="text"placeholder="userName"/><inputtype="text"placeholder="repo"/><buttontype="submit">Go</button></form> 第一种方法是使用browserHistory.push import{browserHistory}from'react-router'// ...handleSubmit(event){event.preventDefault()const userName=ev...