Conditional Rendering in React application using tsx

Question

I am trying to render a view to the user based on the state they are in a React application using the default React template that Microsoft provides.

Here is the error I am getting:

picture of error

Here is my code:

import * as React from 'react';
import { RouteComponentProps } from 'react-router';
import { NextButton } from './shared/NextButton'
import { StationZero } from './stations/StationZero';

interface BiodieselStudioState {
    station: string[];
    stationNumber: number;
}

export class BiodieselStudio extends 
React.Component<RouteComponentProps<{}>, BiodieselStudioState> {
    constructor() {
        super();

        this.state = {
            station: ["StationZero", "StationOne", "StationTwo",
                    "StationThree", "StationFour", "StationFive",
                    "StationSix", "StationSeven"],
            stationNumber: 0
        };
}

public render() {
    return (
        <div>
            <h1>BIODIESEL STUDIO!</h1>
            { this.chooseStation(this.state.stationNumber) }
            <NextButton />
        </div>
    );
}

chooseStation(stationNumber: number) {
    switch(stationNumber) {
        case 0: {
            return <StationZero />
            break;
        }
        case 1: {

            break;
        }
        case 2: {

            break;
        }
        case 3: {

            break;
        }
        case 4: {

            break;
        }
        case 5: {

            break;
        }
        case 6: {

            break;
        }
        case 7: {

            break;
        }
        case 8: {

            break;
        }
        default: {

        }
    }
}

I have to load in very different user interfaces, but this is basically the host for the station views and the idea is that the child components will have the user complete an activity and update the state in BiodieselStudio which will make it so that the app works as needed.

A lot of the case statements aren't filled out but it will follow the same pattern!

Huge thanks in advance you guys!

It is the line that returns <StationZero /> and it can be found below case 0 of my chooseStation function @FuzzyTree — MaholeycowDev
– MaholeycowDev, Commented Apr 22, 2018 at 23:08

FuzzyTree · Accepted Answer · 2018-04-23 00:57:30Z

1

According to the error your StationZero component has RouteComponentProps<{}> defined for its props

i.e.

class StationZero extends React.Component<RouteComponentProps<{}>> {

But you're not passing it RouteComponentProps since you're not mounting the component via react-router.

You can fix this error by removing RouteComponentProps<{}> from the StationZero component definition:

class StationZero extends React.Component {

Also remove this break to fix the 'unreachable code' error.

case 0: {
    return <StationZero />
    break; // not reachable because of return
}

answered Apr 23, 2018 at 0:57

FuzzyTree

32.4k3 gold badges58 silver badges87 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

MaholeycowDev Over a year ago

This was the solution to my problem. Thank you!

Collectives™ on Stack Overflow

Conditional Rendering in React application using tsx

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related