When a React CSS class is deployed to a production server, it may be automatically

Question

When a React CSS class is deployed to a production server, it may be automatically

I've encountered a strange CSS issue while working on my React project. One specific section of the JSX <div> has a class with style properties defined in the main .css file. During local development, everything appears as expected. However, after building and uploading to the production server, the styling of that particular section changes and becomes distorted.

For example:

Original JSX

// Code snippet

Original DOM:

// Example DOM

The CSS for this JSX is:

// Styling code for diabMetr component

The DOM changes after build and uploaded to the server:

// Changed DOM structure

The CSS for the class .jss16 is:

.jss16 {
    width: 450px;
}

Issue to notice Description of the observed issue.

Attempted solutions:

// Tried CSS modifications

Facing challenges:

// Continued issues despite attempted fixes

Seeking assistance:

// Request for help

javascript html css reactjs material-ui

Answer 1

Answer №1

There are numerous issues with the code provided. Firstly, in the jsx, the CSS class is incorrectly labeled as className, as pointed out by @Max in their response.
Another problem arises from how @material-ui's makeStyles function operates. The classNames generated by makeStyles get transformed into random names during the build process to maintain uniqueness. This behavior is a feature of @material-ui. I recommend referring to the documentation on makeStyles for more clarification. Additionally, you can find a code example here.

To effectively use the makeStyles classes, they need to be integrated into your component.

import React from 'react';
import { makeStyles } from '@material-ui/core/styles';

const useStyles = makeStyles({
  root: {
    backgroundColor: 'red',
    color: props => props.color,
  },
});

export default function MyComponent(props) {
  const classes = useStyles(props);
  return (
    <div className={classes.root}>
      Lorem ipsum dolor
    </div>
  );
}

Update

In line with your jsx code, incorporate the styles from the CSS class .makeStyles-root-1 within the useStyles object. This will apply the specified styles to the respective element.
Upon addition of these CSS styles to the useStyles object, it should resemble the following:-


const useStyles = makeStyles((theme) => ({
  root: {
    width: 'calc(100% - 220px) !important',
    float: 'right',
    marginTop: '-22px'

  },
  margin: {
    height: 100,
  },
}));

The root class will now include these styles and automatically apply them without the need for separate styling from an external CSS file.

Answer 2

There are numerous issues with the code provided. Firstly, in the jsx, the CSS class is incorrectly labeled as className, as pointed out by @Max in their response.
Another problem arises from how @material-ui's makeStyles function operates. The classNames generated by makeStyles get transformed into random names during the build process to maintain uniqueness. This behavior is a feature of @material-ui. I recommend referring to the documentation on makeStyles for more clarification. Additionally, you can find a code example here.

To effectively use the makeStyles classes, they need to be integrated into your component.

import React from 'react';
import { makeStyles } from '@material-ui/core/styles';

const useStyles = makeStyles({
  root: {
    backgroundColor: 'red',
    color: props => props.color,
  },
});

export default function MyComponent(props) {
  const classes = useStyles(props);
  return (
    <div className={classes.root}>
      Lorem ipsum dolor
    </div>
  );
}

Update

In line with your jsx code, incorporate the styles from the CSS class .makeStyles-root-1 within the useStyles object. This will apply the specified styles to the respective element.
Upon addition of these CSS styles to the useStyles object, it should resemble the following:-


const useStyles = makeStyles((theme) => ({
  root: {
    width: 'calc(100% - 220px) !important',
    float: 'right',
    marginTop: '-22px'

  },
  margin: {
    height: 100,
  },
}));

The root class will now include these styles and automatically apply them without the need for separate styling from an external CSS file.

Answer 3

Answer №2

Solution

If you come across a div with the class name "jss16" and are unsure about which component generates it, let's assume it is produced by ExternalComponent.

To customize this div, consider adding a custom className (assuming ExternalComponent handles this properly):

<ExternalComponent className="myclass">
   ...
</ExternalComponent>

This will result in the following DOM structure:

<div class="jss16 myclass">
    ...
</div>

You can then style the myclass using CSS as follows:

.myclass {
  width: calc(100% - 220px) !important;
  float: right;
  margin-top: -22px;
}

Explanation

Since ExternalComponent utilizes jss to dynamically create CSS classes, you cannot always predict the name of the generated class. In scenarios where components have custom classes, they should concatenate props.className to the generated jssClassname like this:

return (
    <div className={jssClassname + props.className ? ' ' + props.className : ''}>
        {children}
    </div>
);

Answer 4

Solution

If you come across a div with the class name "jss16" and are unsure about which component generates it, let's assume it is produced by ExternalComponent.

To customize this div, consider adding a custom className (assuming ExternalComponent handles this properly):

<ExternalComponent className="myclass">
   ...
</ExternalComponent>

This will result in the following DOM structure:

<div class="jss16 myclass">
    ...
</div>

You can then style the myclass using CSS as follows:

.myclass {
  width: calc(100% - 220px) !important;
  float: right;
  margin-top: -22px;
}

Explanation

Since ExternalComponent utilizes jss to dynamically create CSS classes, you cannot always predict the name of the generated class. In scenarios where components have custom classes, they should concatenate props.className to the generated jssClassname like this:

return (
    <div className={jssClassname + props.className ? ' ' + props.className : ''}>
        {children}
    </div>
);

Answer 5

Answer №3

Due to some syntax issues, I was unable to reproduce the error. However, by addressing the following fixes, the build should function correctly:

Ensure closing / tag for input
Use objects for styling, like
```
style={{left: '0%', width: '83.3333%'}}
```
Change class to className
Change tabindex to tabIndex

If those adjustments do not resolve the issue, consider modifying your CSS selector from .diabMetr + span + div to:

.diabMetr > span + div {}

or

.diabMetr > div {}

Your current selector is not targeting the desired child element.

Answer 6

Due to some syntax issues, I was unable to reproduce the error. However, by addressing the following fixes, the build should function correctly:

Ensure closing / tag for input
Use objects for styling, like
```
style={{left: '0%', width: '83.3333%'}}
```
Change class to className
Change tabindex to tabIndex

If those adjustments do not resolve the issue, consider modifying your CSS selector from .diabMetr + span + div to:

.diabMetr > span + div {}

or

.diabMetr > div {}

Your current selector is not targeting the desired child element.

When a React CSS class is deployed to a production server, it may be automatically

Answer №1

Update

Answer №2

Solution

Explanation

Answer №3

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