React study notes (ii) REACT form detailed

I. Introduction of uncontrolled components and controllable components

What is an uncontrolled component

<input type= "text" defaultvalue= "Hello World"/>
var inputvalue =?
var inputvalue = React.finddomnode (this.refs.input). Value

What is a controllable component

<input type= "text" Defaultvalue={this.state.value}/>var inputvalue = This.state.value

Why components need to be controlled

Component-controllable Benefits:

1. Data stream conforming to react

2. Data stored in state for ease of use

3. Easy to handle the data

React study notes (ii) REACT form detailed