Category Archives: ReactJS

NavLink ListItems not Applying activeClassName class when Clicked On – ReactJS React-Router MaterialUI

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Hi everyone,

A bit of a hairy issue I ran into today that took a while to track down. I’m using React Router with Material UI to render a Drawer as a sidebar:

The issue was that some links were not applying the expected activeclass:


	
		
	
	<ListItemText primary={
		
			About
		
	} />

After trawling through react-router I eventually found a post on github that mentioned a similar issue: https://github.com/ReactTraining/react-router/issues/4638

The solution turned out to be wrapping all relevant components with withrouter.

Uncaught SyntaxError: Unexpected token < – ReactJS Build

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Hi everyone,

A ReactJS issue I ran into after running npm run build:

Uncaught SyntaxError: Unexpected token <

This one took a while to track down but it essentially boils down to the built index.html file referencing paths relatively:

Issue: index.html was referencing
"</html".

Instead of:
"</html".

This meant that anytime a page was accessed directly it attempted to load the static files from the wrong directory. To fix it, I had to update the homepage node in package.json

Original:
...
"version": "0.1.0",
  "homepage": "./",
  "private": true,
...

Instead use:
"version": "0.1.0",
  "homepage": "/",
  "private": true,

Hopefully that’s able to help someone else out, took a while to track down!

npm ERR! missing script: flow npm ERR! A complete log of this run can be found in: – ReactJS and Flow

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Hi everyone,

I ran into the following error while trying to setup flow:

npm ERR! missing script: flow
npm ERR! A complete log of this run can be found in:

To fix this, just add “flow”: “flow” as a new entry under “scripts” in your package.json file.

See the following link for more info:
https://github.com/facebook/create-react-app/blob/master/packages/react-scripts/template/README.md#adding-flow

Including an Externally Hosted Script in ReactJs

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Hi everyone,

Just a quick example of how to include an externally hosted js file in a reactjs app. In index.html add your script tag as you would in a normal app:

  
    https://js.prelive.promisepay.com/PromisePay.js

Then in the file you plan to use the library you can add a const and reference it normally:

const promisepay = window.promisepay;

Thanks to this link for the info: https://stackoverflow.com/a/44877953/522859

Allow Number and String for PropTypes – ReactJS

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Hi everyone,

A quick post on how to allow a string or number when defining PropTypes:

static propTypes = {
        numberField: PropTypes.number.isRequired,
        stringField: PropTypes.number.isRequired,
        mixedField: PropTypes.oneOfType([PropTypes.string, PropTypes.number]).isRequired
    }

Thanks to this stackoverflow post for the info: https://stackoverflow.com/a/41808543/522859

Overriding Button Styles and Hover Effects – Material UI

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Hi everyone,

Just a quick post on how to override the background color and hover effects for buttons in material ui:

Define your class as follows: 


const styles = theme => ({
    ...
    greenButton: {
        backgroundColor: green[500],
        color: '#FFF',
        '&:hover': {
            backgroundColor: green[400],
            color: '#FFF'
        }
    }

Then just reference it as you normally would:


const styles = theme => ({

const { classes } = this.props;

Multiple Instances of Component Firing Incorrect onChange – ReactJS

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Hi everyone,

I ran into a bit of an issue today while trying to render multiple instances of a component on a single page. Each component had a file input that was bound with an onChange event. When triggered the onChange function referenced the first component placed on the page no matter which instance was clicked.

The issue ended up being that the id of the input fields coincidentally overlapped. This meant that there were multiple instances of the field on the page with the same id value. Ensuring that each one was unique resolved the issue.

Took a fair while to narrow this one down so hopefully it’ll be able to help someone else!

Thanks,
Chris

Avoiding Wrapper Divs in ReactJs

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Hi everyone,

Just a quick post on how you can avoid wrapper divs in ReactJs. It’s particularly useful when populating tables or creating parts of a larger component. Instead of the following:

return (
  

    Frogs
    Turtles
  

);

You can use fragments:

import React, { Fragment } from 'react'
...
return (
  
    Frogs
    Turtles
  
);

The fragment won’t polute the dom and mean that you don’t need to add any additional styling. Check out these links for more info:
https://reactjs.org/docs/fragments.html
https://stackoverflow.com/a/49375945/522859
https://reactjs.org/blog/2017/11/28/react-v16.2.0-fragment-support.html

Where to Import Colors from in MaterialUI – ReactJS

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Hey everyone,

I ran into the following error while trying to import colors in MaterialUI:

Module not found: Can’t resolve ‘material-ui/styles/colors’

It turns out that the path to colors changed in V1, so a lot of guides aren’t quite right. All you need to do is change it to the following:

/* import {grey, amber} from ‘material-ui/styles/colors’ Original */
import {grey, amber} from ‘material-ui/colors’ /* New */

Thanks to this Github post for the answer: https://github.com/mui-org/material-ui/issues/6446

Full Page Layout Example for Material UI – ReactJS

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Hi everyone,

I’ve spent the last couple of days looking into MaterialUI. It seems really good however there are very few examples of a layout wireframe. After digging through Github I came across the following CodeSandbox:

https://codesandbox.io/embed/vm4r07mxn5

There are a number of other themes and templates available (such as the amazing Material Dashboard) but they are all very in depth and not really suitable for a quick prototype or mock.

Thanks to Luke Peavey for posting the answer on StackOverflow. It definitely deserves a lot more views: https://stackoverflow.com/a/50312721/522859

Hopefully, this will be able to save someone else a bit of time!

Cheers,
Chris