# Customizing React-Select with TypeScript: A Developer’s Alchemy

If you're reading this article because you think customizing the [`react-select`](https://www.npmjs.com/package/react-select) library with TypeScript is going to be a walk in the park—close this tab right now. After combing through the documentation, I, too, was under the impression that this would be a plug-and-play endeavor. Man, was I in for a surprise!

Still here? Cool, let's dive right in.

#### The Magic Behind React-Select

For those who don't know, `react-select` is a highly customizable replacement for the HTML `<select>` element. It works exceptionally well with React, providing numerous ways to style the dropdown and the options within.

#### How To Create Custom Options with HTML Templates

Before diving into the code, let's understand that `react-select` gives you a very nifty `components` prop. This allows you to override any part of the UI.

Here's a quick example:

```javascript
import React from 'react';
import Select, { components } from 'react-select';

const CustomOption = (props: any) => (
  <components.Option {...props}>
    <div>
      <strong>{props.data.label}</strong>
      <small>{props.data.description}</small>
    </div>
  </components.Option>
);

export const MySelect = () => (
  <Select
    components={{ Option: CustomOption }}
    options={[
      { label: 'Apple', value: 'apple', description: 'A red fruit' },
      { label: 'Banana', value: 'banana', description: 'A yellow fruit' }
    ]}
  />
);
```

If you want to add more finesse to your options, you can use the `isDisabled, isFocused, isSelected` props.

```javascript
import React from 'react';
import Select, { components } from 'react-select';

const CustomOption = (props: any) => {
  const { isDisabled, isFocused, isSelected } = props;

  return (
    <components.Option {...props}>
      <div style={{ opacity: isDisabled ? 0.5 : 1 }}>
        <strong>{props.data.label}</strong>
        { isSelected && <span> •</span> }
        <small style={{ color: isFocused ? 'blue' : 'grey' }}>
          {props.data.description}
        </small>
      </div>
    </components.Option>
  );
};

export const MySelect = () => (
  <Select
    components={{ Option: CustomOption }}
    options={[
      { label: 'Apple', value: 'apple', description: 'A red fruit' },
      { label: 'Banana', value: 'banana', description: 'A yellow fruit' }
    ]}
  />
);
```

Now you can make that option look the way you want.

#### Styling the Menu and MenuList: Giving Your Dropdown Some Sass

So you know:

* the **menu**: is essentially the container that wraps around all the options you see when the dropdown is activated. It is responsible for the placement, size, and other container-specific styling of the dropdown list. Customizing `menu` will affect the dropdown's outer box.
    
* the **menuList**: is a child component within the `menu` and directly wraps around the individual option items. Customizing `menuList` will affect the styling and layout of the options inside the `menu` but not the external container itself.
    

Think of `menu` as the outer shell and `menuList` as the inner lining. Any customization you apply to these components will alter how the dropdown appears and behaves when opened.

Customizing the style in `react-select` is made possible with the `styles` prop. You can easily change the border radius, color, and many other styles.

```javascript
const customStyles = {
  menu: (provided: any) => ({
    ...provided,
    borderRadius: '0px',
    backgroundColor: 'lightgray'
  }),
  menuList: (provided: any) => ({
    ...provided,
    padding: '0px'
  })
};

export const MyStyledSelect = () => (
  <Select
    styles={customStyles}
    options={[
      { label: 'Apple', value: 'apple' },
      { label: 'Banana', value: 'banana' }
    ]}
  />
);
```

Just remember that some of the styles might need an `!important` next to them or else they won't show.

#### Let's Jazz Up That Input

The input box itself can also be styled, just like the menu and options. Simply target `control` in the `styles` prop.

```javascript
const inputStyles = {
  control: (provided: any) => ({
    ...provided,
    borderRadius: '15px',
    borderColor: '#3f51b5'
  })
};

export const MyInputStyledSelect = () => (
  <Select
    styles={inputStyles}
    options={[
      { label: 'Apple', value: 'apple' },
      { label: 'Banana', value: 'banana' }
    ]}
  />
);
```

**Don't forget about the menuPosition**

The menuPosition is another vital setting when you're customizing your dropdowns, and it's often mistaken for `menuPlacement`. While `menuPlacement` determines the location of the menu in terms of above or below the control, `menuPosition` goes further to dictate how the dropdown menu is positioned in the DOM.

Here are the options you can set for the `menuPosition` prop:

* `absolute`: This is the default value. The menu is rendered within the DOM hierarchy of the control. It won't break out of a parent element with `overflow: hidden` set. So, if your `react-select` component is inside a container that hides overflow, the dropdown might not be displayed properly.
    
* `fixed`: The menu is rendered at the root level of the DOM hierarchy, so it's not constrained by a parent's `overflow: hidden` style. This setting allows the dropdown to break out of any containing element, ensuring visibility.
    

Here's how you'd set it in code:

```javascript
import Select from 'react-select';

export const MyFixedMenuSelect = () => (
  <Select
    menuPosition="fixed"
    options={[
      { label: 'Apple', value: 'apple' },
      { label: 'Banana', value: 'banana' }
    ]}
  />
);
```

In this example, by setting the `menuPosition` to "fixed", the dropdown will be appended to the root level of the DOM and will not be confined by a parent element with `overflow: hidden`.

Think of `menuPosition` as the setup for how your dropdown behaves in a broader context within the DOM, much like how middleware affects an entire application. It gives you the control to adapt your dropdown menu to various scenarios and layout constraints. Choose wisely based on your application's needs!

#### The Aha Moment

By now, you should be feeling pretty comfortable manipulating `react-select` with TypeScript.

The best part? You can have these complex styles and custom options up and running faster than you can say "JavaScript fatigue."

That’s all, folks.

Happy coding! 🚀