React Navigation: 'navigation.state.params' is always undefined in 'static navigationOptions'

user_7416008 0
Viewed 9115

The heart of my problem is that when I have this in my navigationOptions:

static navigationOptions = ({ navigation }) => {
    console.log(navigation)
    console.log(navigation.state)
}

The first 'console.log' statement returns the navigation object complete with "navigation.state.params" containing the params that I have passed into it.

However, the second 'console.log' returns the 'navigation.state' object but for some reason the 'params' are undefined.

Here is how I am setting the navigation params (from redux): 

function mapStateToProps(state, props) {
    let sum = 0
    for (let product in state.cart) {
        sum += state.cart[product]
    }
    return props.navigation.state = {params: {cartSum: sum}}
}

And my developer environment:

node 6.10.1
react-native 0.46.4
redux 3.7.1
react-redux 5.0.5
react-navigation 1.0.0-beta.11

react-navigation react-redux redux react-native javascript
2 Answers

It is possible to go around this issue by implementing a method in the component class.

getNavigationParams() {
        return this.props.navigation.state.params || {};
    }

This will give you access to the parameters. But it does not work for nested objects.

user_77175830
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