The error message "TypeError: 'undefined' is not an object ('_this.props')" indicates that the property '_this

Having trouble solving this issue. Need assistance with evaluating 'this.props.speciesSelection.modalize'

<BarcodeInput
        speciesSelection={this.props.speciesSelection}
        species={species[0]}
        barcode={{ manufacturerValue: "", codeValue: "" }}
        onChangeText={this.onChangeText}
      />


 class BarcodeInput extends React.Component<Props, State> {
  onPrefixPress = () => {
    Keyboard.dismiss();
    this.props.speciesSelection.modalize.open();
    this.props.speciesSelection.modalizeOpened = true;
 }

Encountering a red box when interacting with the button in onPrefixPress.

javascripttypescriptreact-native

Answer №1

It seems like you are attempting to call a function (passed through props) that is not defined. Consider making the speciesSelection prop optional.

interface Props {
  species: Species;
  barcode: BarcodeState;
  speciesSelection?: any;
  onChangeText: (prop: keyof BarcodeState, value: string) => void;
}

interface State { }

class BarcodeInput extends React.Component<Props, State> {
  onPrefixPress = () => {
    Keyboard.dismiss();
    this.props.speciesSelection && this.props.speciesSelection.modalize.open();
    this.props.speciesSelection && this.props.speciesSelection.modalizeOpened = true;
  }

Alternatively, investigate why it is currently undefined.

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