我不应该这样做的唯一原因是让反应更新视图。 https://facebook.github.io/react/docs/state-and-lifecycle.html#using-state-correctly
但似乎MobX-react为我做了这些肮脏的工作。我只需要将this.state
标记为可观察,并且一切都按预期工作。有什么缺点吗?我不想把所有州都扔进一家大商店。
代码:
const {observable, computed} = mobx;
const {observer} = mobxReact;
const {Component} = React;
@observer
class Form extends React.Component{
@observable state = {
username: '',
password: '',
};
constructor(...args) {
super(...args);
this.handleSubmit = this.handleSubmit.bind(this)
}
render() {
return <form onSubmit={this.handleSubmit}>
<label>
Name:
<input type="text" value={this.state.username} onChange={event => this.state.username = event.target.value} />
</label>
<div>username: {this.state.username}</div>
<input type="submit" value="Submit" />
</form>;
}
handleSubmit(event: Event) {
event.preventDefault();
console.log(this.state.username);
}
}
ReactDOM.render(
<div>
<Form />
<mobxDevtools.default />
</div>
, document.getElementById('mount'));
答案 0 :(得分:2)
最好完全绕过state
并将可观察数据直接放在课堂上。
示例(JS Bin)
const {observable, computed} = mobx;
const {observer} = mobxReact;
const {Component} = React;
@observer
class Form extends React.Component{
@observable username = '';
@observable password = '';
constructor(props) {
super(props);
this.handleSubmit = this.handleSubmit.bind(this)
}
render() {
return <form onSubmit={this.handleSubmit}>
<label>
Name:
<input type="text" value={this.username} onChange={event => this.username = event.target.value} />
</label>
<div>username: {this.username}</div>
<input type="submit" value="Submit" />
</form>;
}
handleSubmit(event: Event) {
event.preventDefault();
console.log(this.username, this.password);
}
}
ReactDOM.render(
<div>
<Form />
</div>
, document.getElementById('mount'));
答案 1 :(得分:1)
您可以将其命名为form
而不是state
,它不会关心,它会绕过React的setState
和重新呈现机制。除了将状态更新合并到组件之外,React setState
还会告诉您的组件重新呈现。 React组件有forceUpdate
。
MobX也会同时执行这两项工作,通过更新observable
,您还会向已连接的observer
组件发送消息以进行更新。拥有一个中央状态存储是React的既定模式。