CODEWITHSUNDEEP
reactjsreact-nativemobxmobx-react
m_____0
m_____0

Reputation: 405

React native + mobx dont re render

Iam currently building an application with react native and mobx. My problem is that the component is not re-rendered after a observable value from the store is changed. My code looks as following:

components/phoneNumberChange.js:

@inject('store')
@observer export class PhoneNumberChange extends React.Component{
renderPhoneInput = () => (
  <React.Fragment>
    <Button onPress={() => this.props.store.showCountryPicker()}>
      <Text>Show picker</Text>
    </Button>
  </React.Fragment>
);

render = () => (
  <React.Fragment>
    <CountryCodePicker visible= {this.props.store.pickerVisible}/>
  </React.Fragment>
);
}

screens/loginScreen.js:

import { Provider } from "mobx-react";
import { store } from "stores/phoneNumberChangeStore.js";
import { PhoneNumberChange } from "components/phoneNumberChange.js";

export class LoginScreen extends React.Component{

render = () => (
  <Provider store={store}>
    <PhoneNumberChange/>
  </Provider

);

}

stores/phoneNumberChangeStore.js:

import { observable, action } from "mobx";

class PhoneNumberChangeStore {
  @observable pickerVisible;

  constructor(){
    this.hideCountryPicker();
  }
  @action hideCountryPicker = () => {
    this.pickerVisible = false;
  }
  @action showCountryPicker = () => {
    this.pickerVisible = true;
  }

}
export const store = new PhoneNumberChangeStore();

babel.config.js:

module.exports = function(api) {
  api.cache(true);
  return {
    presets: ['babel-preset-expo'],
    plugins: [
        [
            "@babel/plugin-proposal-decorators",
            {
                "legacy": true
            }
        ]
    ]
  };
};

package.json:

{
  "name": "myapp",
  "main": "app/app.js",
  "scripts": {
    "start": "expo start",
    "android": "expo start --android",
    "ios": "expo start --ios",
    "eject": "expo eject"
  },
  "dependencies": {
    "@babel/plugin-proposal-decorators": "^7.3.0",
    "babel-plugin-transform-decorators-legacy": "^1.3.5",
    "babel-preset-react-native": "^4.0.1",
    "expo": "^32.0.0",
    "mobx": "^5.9.0",
    "mobx-react": "^5.4.3",
    "prop-types": "^15.7.2",
    "react": "16.5.0",
    "react-native": "https://github.com/expo/react-native/archive/sdk-32.0.0.tar.gz",
    "react-native-animatable": "^1.3.1",
    "react-native-ui-kitten": "^3.1.2",
    "react-navigation": "^3.3.2"
  },
  "devDependencies": {
    "babel-preset-expo": "^5.0.0"
  },
  "private": true
}

The countryCodePicker gets shown or not when the visible prop changes. This is working. but when i change a value from the store it doesnt update and gets shown. I would appreciate any help!

Cheers

Upvotes: 2

Views: 1278

Answers (2)

m_____0
m_____0

Reputation: 405

Found the solution! I redefined render on the instance.

I changed render = () => {..} to render(){ return (...); }

cheers!

Upvotes: 1

Tholle
Tholle

Reputation: 112897

You are exporting your store singleton as default in phoneNumberChangeStore.js, but you are importing a named export PhoneNumberChangeStore in loginScreen.js.

Use the default export in loginScreen.js instead. The store property is also called pickerVisible, not countryCodePickerVisible.

Upvotes: 1

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