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 ....
};//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...
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...
import{useFormStatus}from'react-dom';functionDesignButton(){const{pending}=useFormStatus();return<button type="submit" disabled={pending}/>} useFormStatus 读取父 <form> 的状态，就像表单是一个上下文提供者一样。新钩子：#useOptimistic 执行数据变更时，另一个常见的 UI 模式是在异步请求进行中乐观地...
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...
<form onSubmit={submit}> <input value={title} onChange={event => setTitle(event.target.value)} type="text" placeholder="颜色名称" required/> <input value={color} onChange={event => setColor(event.target.value)} type="color" required/> <button type="submit">添加</button> </form> ...
react-onsubmit-event-inline.png 现在我们知道了正确的类型,我们就可以提取事件处理函数。 代码语言:javascript 复制 functionApp(){consthandleSubmit=(event:React.FormEvent<HTMLFormElement>)=>{event.preventDefault();console.log(event.target);};return(<div><form onSubmit={handleSubmit}><input type="submit...
<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...