Create a simple select box with a very long option label

Oct 13, 2025 by pynkocean.com 97 views

Introduction

When working with long option labels in a select box, a common issue arises where the background color of the selected or focused option does not extend to the right, especially when a horizontal scroll is needed. This can result in an inconsistent user experience, making it difficult for users to distinguish between different options. In this article, we will explore this issue, provide a simple example to recreate the problem, and discuss possible solutions to achieve the expected behavior.

The Problem

The issue is demonstrated in the provided Codesandbox example. To recreate the problem, follow these steps:

Create a simple select box with a very long option label:

import React from "react";

import Select from "react-select";

export default () => (
  <Select
    options={[
      {
        label:
          "longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong",
        value: "verylong",
      },
    ]}
  />
);

Run the code and open the dropdown by clicking the select box.
Scroll to the right to see the rest of the label.
Observe the white background.

As you can see, the background color of the selected option does not extend to the right, leaving a white space on the right side of the label.

Expected Behavior

The expected behavior is that the background color of the selected or focused option extends all the way to the right, encompassing the whole label. This would provide a consistent user experience and make it easier for users to distinguish between different options.

Possible Solutions

There are a few possible solutions to achieve the expected behavior:

1. Customize the Select Component

One possible solution is to customize the Select component to extend the background color to the right. This can be achieved by overriding the styles prop of the Select component.

import React from "react";

import Select from "react-select";

const customStyles = {
  option: (provided, state) => ({
    ...provided,
    padding: 20,
    backgroundColor: state.isSelected ? "blue" : "white",
    color: "white",
    width: "100%",
  }),
};

export default () => (
  <Select
    options={[
      {
        label:
          "longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong",
        value: "verylong",
      },
    ]}
    styles={customStyles}
  />
);

In this example, we override the option style to set the width to 100% and the backgroundColor to blue when the option is selected.

2. Use a Custom Option Component

Another possible solution is to use a custom option component that extends the background color to the right. This can be achieved by creating a custom component that wraps the original option component.

import React from "react";

import Select from "react-select";

const CustomOption = ({ children, isFocused, isSelected, ...props }) => {
  return (
    <div
      style={{
        padding: 20,
        backgroundColor: isSelected ? "blue" : "white",
        color: "white",
        width: "100%",
      }}
    >
      {children}
    </div>
  );
};

export default () => (
  <Select
    options={[
      {
        label:
          "longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong",
        value: "verylong",
      },
    ]}
    components={{ Option: CustomOption }}
  />
);

In this example, we create a custom CustomOption component that wraps the original option component and sets the width to 100% and the backgroundColor to blue when the option is selected.

3. Use a CSS Solution

Finally, a CSS solution can also be used to achieve the expected behavior. This can be achieved by adding a CSS rule that targets the option element and sets its width to 100%.

.select-option {
  width: 100% !important;
}

This CSS rule can be added to the global CSS file or to the CSS file of the Select component.

Conclusion

Introduction

In our previous article, we explored the issue of option background colors not filling very long labels in a select box. We discussed possible solutions to achieve the expected behavior, including customizing the Select component, using a custom option component, and using a CSS solution. In this article, we will answer some frequently asked questions related to this issue.

Q: What is the expected behavior for option background colors in a select box?

A: The expected behavior is that the background color of the selected or focused option extends all the way to the right, encompassing the whole label.

Q: Why does the background color not extend to the right in a select box?

A: The background color does not extend to the right in a select box because the option element is not wide enough to accommodate the entire label. This can happen when the label is very long and the select box is not wide enough to display the entire label.

Q: How can I customize the Select component to achieve the expected behavior?

A: You can customize the Select component by overriding the styles prop. This allows you to set the width of the option element to 100% and the backgroundColor to the desired color.

Q: What is the difference between customizing the Select component and using a custom option component?

A: Customizing the Select component involves overriding the styles prop to set the width and backgroundColor of the option element. Using a custom option component involves creating a new component that wraps the original option component and sets the width and backgroundColor of the option element.

Q: Can I use a CSS solution to achieve the expected behavior?

A: Yes, you can use a CSS solution to achieve the expected behavior. This involves adding a CSS rule that targets the option element and sets its width to 100%.

Q: What are the benefits of using a custom option component?

A: The benefits of using a custom option component include:

Flexibility: You can customize the appearance and behavior of the option component to suit your needs.
Reusability: You can reuse the custom option component in multiple places in your application.
Maintainability: You can easily maintain and update the custom option component without affecting the rest of your application.

Q: What are the benefits of using a CSS solution?

A: The benefits of using a CSS solution include:

Simplicity: You can achieve the expected behavior with a simple CSS rule.
Flexibility: You can customize the CSS rule to suit your needs.
Maintainability: You can easily maintain and update the CSS rule without affecting the rest of your application.

Conclusion

In conclusion, the issue of option background colors not filling very long labels is a common problem that can be solved using various techniques. By customizing the Select component, using a custom option component, or using a CSS solution, we can achieve the expected behavior and provide a consistent user experience. We hope this Q&A article has been helpful in answering your questions and providing a better understanding of this issue.