Customize the Emotion Styled Material UI Tab Indicator Overwrite

Looking for a way to customize the appearance of tab indicators using Emotion styled components. I'm struggling to target nested classes in my code. Here's what I have so far:


const StyledTabs = styled(Tabs)(
  {
    classes: {
      indicator: {
        background: 'black',
      },
    },
  }
);

If anyone has any insights or tips, I would greatly appreciate it! Thanks in advance!

Answer №1

Upon review, there are a few issues to address with the code provided. The Emotion library's styled function is limited in that it only supports generating a single class name per usage, and does not offer support for the classes: {indicator: {styles}} structure as shown in your example.

To work around this limitation and provide a class name for the "indicator" class of Tabs, you can use the following syntax:

const StyledTabs = styled(({ className, ...other }) => {
  return <Tabs {...other} classes={{ indicator: className }} />;
})({
  backgroundColor: "black"
});

However, it should be noted that this solution may not work seamlessly in all cases, as the insertion point for Emotion's styles within the <head> of the document could conflict with the <style> elements generated by JSS (used for Material-UI's styling). More information on altering the insertion point for JSS can be found here. A working example demonstrating these concepts is provided in the sandbox linked below.

You can access the sandbox here:
https://codesandbox.io/s/jvkn58lpn3?fontsize=14

An alternative syntax option allows for controlling multiple Tabs classes, like so:

const StyledTabs = styled(({ className, ...other }) => {
  return <Tabs {...other} classes={{ root: className, flexContainer: "flexContainer", indicator: "indicator" }} />;
})({
  "& .indicator": {
    background: "black"
  },
  "& .flexContainer": {
    flexDirection: "row-reverse"
  }
});

You can view this alternate approach in action in the following sandbox link:
https://codesandbox.io/s/q7q7207606?fontsize=14

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