问题
My app stopped updating on observable changes and I'm going crazy trying to figure out why. The code below shows only "Counter: 5" on the screen even though the console shows that it is updating. The relevant parts of package.json are:
{
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
},
"dependencies": {
"mobx": "^6.0.4",
"mobx-react": "^7.0.5",
"react": "17.0.0",
"react-dom": "17.0.0",
"react-icons": "^4.1.0",
"react-router-dom": "^5.2.0",
"typescript": "^4.0.3",
},
"devDependencies": {
"babel-preset-mobx": "^2.0.0",
"react-app-rewire-yaml": "^1.1.0",
"react-scripts": "^4.0.1"
}
}
import React from "react";
import ReactDOM from "react-dom";
import "./index.css"
import { inject, observer, Provider } from "mobx-react";
import { observable } from "mobx";
class TestModel
{
@observable counter = 5;
start() {
setInterval(() => {this.counter++; console.log(this.counter)}, 1000);
}
}
@inject("testModel")
@observer
class TestPage extends React.Component<{testModel?: TestModel}>
{
render() {
return <div><h1>Counter: {this.props.testModel.counter}</h1></div>
}
}
const theTestModel = new TestModel();
theTestModel.start();
ReactDOM.render(
<Provider testModel={theTestModel}>
<TestPage />
</Provider>,
document.getElementById("root")
);
EDIT:
Turns out I needed to call makeObservable(this) in the constructor of my TestModel, plus I had to pull out the side effect into an action context like this:
@action incrementCounter = () => {
this.counter++;
console.log(this.counter)
}
start() {
setInterval(this.incrementCounter, 1000);
}
回答1:
Since mobx@6.0.0 decorators are not enough. You have to make your class observable manually with makeObservable as well.
import { observable, makeObservable } from "mobx";
class TestModel {
@observable counter = 5;
constructor() {
makeObservable(this);
}
start() {
setInterval(() => {this.counter++; console.log(this.counter)}, 1000);
}
}
来源:https://stackoverflow.com/questions/65851639/mobx-observer-suddenly-not-rerendering-when-observable-changes