Internationalization and Localization in LWC

Internationalization and Localization in LWC

On May 24, 2024, Posted by , In LWC Essentials, With Comments Off on Internationalization and Localization in LWC

When I started working with Lightning Web Components (LWC) in Salesforce, I quickly realized the importance of adapting my components to support internationalization (i18n) and localization (L10n). This is crucial for creating applications that can be used by a global audience. Let me share some tips and examples to help you get started.

Understanding i18n and L10n in LWC

Internationalization (i18n) is the process of designing your application in a way that it can be easily adapted to various languages and regions. Localization (L10n) is the process of actually adapting your application to a specific language or region by translating text and formatting data.

Example Code Snippets and Explanation

In LWC, we can use custom labels for internationalization and localization. Custom labels are text values stored in Salesforce that can be translated into any language that Salesforce supports.

Creating a Custom Label:

  1. Go to Setup in Salesforce.
  2. Enter “Custom Labels” in the Quick Find box and select Custom Labels.
  3. Click New Custom Label and fill in the required fields. For example, create a label named Greeting with the value Hello .

Using Custom Labels in LWC:

In your LWC, you can import and use custom labels like this:

import { LightningElement } from 'lwc';
import GREETING_LABEL from '@salesforce/label/c.Greeting';

export default class HelloWorld extends LightningElement {
    greeting = GREETING_LABEL;

In your HTML template, you can display the custom label:

    <p>{greeting}, World!</p>

When adapting Lightning Web Components (LWC) for internationalization (i18n) and localization (L10n), there are several best practices to follow and common mistakes to avoid:

Best Practices

1. Use Custom Labels for Text: Always use custom labels for any user-facing text in your components. This allows for easy translation and ensures that your component can adapt to different languages.

// Good practice: Using custom labels
import greetingLabel from '@salesforce/label/c.Greeting';
export default class HelloWorld extends LightningElement {
    greeting = greetingLabel;

2. Format Dates and Numbers Based on Locale: Use the Intl JavaScript API or Salesforce’s lightning-formatted-number and lightning-formatted-date-time components to format dates and numbers according to the user’s locale.

// Good practice: Formatting dates based on locale
const formattedDate = new Intl.DateTimeFormat('en-US').format(date);

3. Test Your Component in Multiple Languages: Ensure that your component behaves correctly and looks good in all the languages it supports. Pay attention to text direction (e.g., right-to-left for Arabic) and layout changes due to different text lengths.

Common Mistakes

1. Hardcoding Text: Hardcoding text in your component makes it impossible to translate and adapt to different languages.

// Bad practice: Hardcoding text
export default class HelloWorld extends LightningElement {
    greeting = 'Hello';

2. Ignoring Locale-Specific Formatting: Failing to format dates, numbers, and other data based on the user’s locale can lead to confusion and a poor user experience.

// Bad practice: Ignoring locale-specific formatting
const formattedDate = date.toLocaleDateString(); // Missing locale argument

3. Not Handling Text Overflow: When translating text, the length of the text can vary significantly. Not accounting for this can lead to layout issues and text overflow.

/* Bad practice: Not handling text overflow */
.greeting {
    width: 100px; /* Fixed width can cause overflow */

By following these best practices and avoiding common mistakes, you can create LWCs that are more adaptable and user-friendly for a global audience.

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