17 December 2024 Leave a comment Tech-Help
When dealing with long text content in mobile applications, it’s often necessary to truncate text and append ellipses to maintain a clean and user-friendly interface. This guide will walk you through the process of applying an ellipsis effect to text elements in React Native.
Using the numberOfLines Property
The simplest way to truncate text in React Native is by using the numberOfLines property on a Text component. This property allows you to specify the maximum number of lines the text should occupy. Text exceeding this limit will be truncated with an ellipsis:
<Text numberOfLines={1}>long long long long text</Text>This will display:
long long long…Note that this example assumes a short width container is applied to the text.
Controlling Ellipsis Position with ellipsizeMode
To further customize the truncation behavior, you can use the ellipsizeMode property. By default, the ellipsis appears at the end of the text (tail), but you can choose to place it at the start (head) or in the middle:
<Text numberOfLines={1} ellipsizeMode='head'>long long long long text</Text>This configuration will result in:
…long long textApplying Styles for Dynamic Layouts
If the text needs to be adjusted according to its container size, especially in row layouts, it’s beneficial to include a style with flex: 1:
<Text numberOfLines={1} style={{ flex: 1 }}>long long text</Text>Advanced Ellipsis Handling
For more advanced scenarios, such as implementing a “read more” feature, consider using libraries like react-native-read-more-text. This library provides a straightforward way to handle expandable text content:
<ReadMore numberOfLines={1} renderTruncatedFooter={(handlePress) => { return <Text onPress={handlePress} style={{ color: 'grey' }}>show more</Text> }}>
<Text>yourText</Text>
</ReadMore>Conclusion
Truncating text in React Native is a straightforward task with the use of numberOfLines and ellipsizeMode. These properties, combined with CSS styles, allow for flexible and effective text management in your applications.
For developers looking to automate testing of their React Native applications, consider using Repeato. Repeato is a no-code test automation tool that allows you to create, run, and maintain automated tests efficiently. Its use of computer vision and AI ensures quick editing and execution of tests, making it ideal for testing scenarios involving dynamic UI elements like text truncation and ellipsis effects.
