CODEWITHSUNDEEP
react-nativereact-navigation
Ghosty
Ghosty

Reputation: 124

Conditional React Navigation header button

I am trying to make a button appear in headerRight of the header bar in a React Navigation screen, but I cant seem to get it to work.

I want the start button (what is in headerRight) to show when props.players.length > 1.

Can anyone point me in the right direction?

Upvotes: 1

Views: 4211

Answers (2)

Patrik Rikama-Hinnenberg
Patrik Rikama-Hinnenberg

Reputation: 1620

If you have a nested navigation for example a child bottomTabNavigator inside a parent stackNavigator please look att applying parent screen options based on child navigator's state see documentation here

For me the second option with Using navigation.setOptions worked with a child bottom tab navigator so I could change stackNavigator header options based on bottomTabNavigator page.

Upvotes: 0

Fromwood
Fromwood

Reputation: 506

You can use the same mechanics describe here for title: https://reactnavigation.org/docs/en/headers.html#setting-the-header-title

Set a navigation params and use it on your navigationOptions.

In your case: 

state = { players: 0 };

static navigationOptions = ({ navigation }) => {
  return {
    headerRight: navigation.getParam('players', 0) > 1 ? <YourHeaderButtonComponent /> : null ,
  };
};

addPlayer = () => {
    this.setState(({players}) => {
        this.props.navigation.setParams({players: players + 1})
        return {players: players + 1 }
    });
}

render {
    ...
    <Button onPress={this.addPlayer}
    ...
}

Upvotes: 5

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