当我设置可观察者时,mobx反应观察者不会触发

时间:2020-10-14 20:32:43

标签: reactjs typescript ecmascript-6 mobx

我正在尝试使用mobx和Typescript创建一个React应用程序。但这不起作用。

我希望计时器能计时秒数。而且我看到该事件发生并更新了计数器。但是该组件不会重新渲染。我在做什么错了?

import React from "react";
import { observable, action } from "mobx";
import { observer, inject, Provider } from "mobx-react";

export class TestStore {
    @observable timer = 0;

    @action timerInc = () => {
        this.timer += 1;
    };
}

interface IPropsTestComp {
    TestStore?: TestStore;
}

@inject("TestStore")
@observer
export class TestComp extends React.Component<IPropsTestComp> {
    constructor(props: IPropsTestComp) {
        super(props);
        setInterval(() => {
            this.props.TestStore!.timerInc();
        }, 1000);
    }

    render() {
        return <div>{this.props.TestStore!.timer}</div>;
    }
}

export class TestApp extends React.Component {
    render() {
        return <Provider TestStore={new TestStore()}>
            <TestComp />
        </Provider>
    }
}

1 个答案:

答案 0 :(得分:4)

您正在使用MobX 6吗?

Decorator API与MobX 5相比有所变化,现在您需要在构造函数中使用makeObservable方法来实现与以前相同的功能:

import { observable, action, makeObservable } from "mobx";

export class TestStore {
    @observable timer = 0;

    constructor() {
      makeObservable(this);
    }

    @action timerInc = () => {
        this.timer += 1;
    };
}

尽管有新事物可能会让您完全放弃装饰器,makeAutoObservable

import { makeAutoObservable } from "mobx";

export class TestStore {
    timer = 0;

    constructor() {
      // Don't need decorators now, just this call
      makeAutoObservable(this);
    }

    timerInc = () => {
        this.timer += 1;
    };
}

此处有更多信息:https://mobx.js.org/react-integration.html