Guidelines for crafting an intricate selector by utilizing mergeStyleSets and referencing a specific class

I'm currently in the process of developing a web application using ReactJS. In my project, I have the following code:

const MyComponent = (props: { array: Array<Data> }) => {
    const styles = mergeStyleSets({
        container: {
            backgroundColor: transparent,
        },
        item: {
            backgroundColor: "#ccc",
        },
        itemContent: {
            color: "#000",
        },
    });

    return (
        <div class={styles.container}>
            {props.array.map((x, i) => (
                <div key={i} class={styles.item}>
                    <div class={styles.itemContent}></div>
                </div>
            ))}
        </div>
    )
};

This block of code will display a container with multiple items, each sharing the same background and text color.

Diving into Complex Selectors

Now, let's say I want to implement alternating backgrounds and text colors for these items by utilizing nth-child(odd). In this scenario, odd items should have different background colors and text colors:

const styles = mergeStyleSets({
    container: {
        backgroundColor: transparent,
    },
    item: {
        backgroundColor: #ccc,
        selectors: {
            ":nth-child(odd)": {
                backgroundColor: "#ddd",
                selectors: {
                    itemContent: {
                        color: "#fff",
                    },
                },
            },
        },
    },
    itemContent: {
        color: "#000",
    },
});

In this snippet, I attempted to reference the itemContent class within the selector of the item class. However, this approach did not yield the desired outcome. How can I modify my solution to achieve the intended result?

Answer №1

Streamlined and Stylish Solution

To achieve alternating row styles, you can set a default style for each row and then selectively modify the odd rows. The snippet below demonstrates this concept specifically with the color property.

function App() {
  const styles = mergeStyleSets({
    item: {
      // Default styles.
      backgroundColor: '#ccc',
      color: "black",
      // Modify odd rows.
      ":nth-child(odd)": {
        backgroundColor: "#ddd",
        color: "red",
      },
    },
  })

  return (
    <>
      {[1, 2, 3, 4, 5, 6, 7, 8, 9].map(x => (
        <div key={x} className={styles.item}>
          <div>{x}</div>
        </div>
      ))}
    </>
  )
}

Alternative Approaches (Less Elegant)

When deciding between CSS or JavaScript solutions, consider the following:

function App() {
  const styles = mergeStyleSets({
    item: {
      backgroundColor: '#ccc',
      ":nth-child(odd)": {
        backgroundColor: "#ddd",
        color: "red",
        '>div': { // Select all direct divs of odd items.
          color: "red",
        },
      },
    },
  })

  return (
    <>
      {[1, 2, 3, 4, 5, 6, 7, 8, 9].map(x => (
        <div key={x} className={styles.item}>
          <div>{x}</div>
        </div>
      ))}
    </>
  )
}

For a JavaScript solution, you would manually check the index to determine if it's even or odd and apply the appropriate CSS class.

function App() {
  const styles = mergeStyleSets({
    item: {
      backgroundColor: '#ccc',
      ":nth-child(odd)": {
        backgroundColor: "#ddd",
      },
    },
    odd: {
      color: "red",
    },
    even: {
      color: 'initial'
    }
  })

  return (
    <>
      {[1, 2, 3, 4, 5, 6, 7, 8, 9].map((x, i) => (
        <div key={x} className={styles.item}>
          <div className={i % 2 === 0 ? styles.odd : styles.even}>{x}</div>
        </div>
      ))}
    </>
  )
}

Important Note

In newer Fluent versions, using the selectors keyword is no longer necessary.

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