What are the best practices for handling dynamic content internationalization in Angular?

According to Angular.io, the i18n tag is used to mark translatable content. It should be placed on every element tag that requires translation of fixed text.

Now, what if we have an element with dynamic content? For example, consider a table displaying a list of assets. The "Description" column may need to be in English sometimes and another language at other times.


    <table class="asset-table">
      <thead>
        <tr>
          <th i18n="@@alarm-list-timeon">Time On</th>
          <th i18n="@@alarm-list-timeoff">Time Off</th>
          <th i18n="@@alarm-list-asset">Asset</th>
          <th i18n="@@alarm-list-description">Description</th>
        </tr>
      </thead>
      <tbody *ngIf="showAssets">
        <tr *ngFor="let asset of pageItems">
          <td>{{asset.timeon}}</td>
          <td>{{asset.timeoff}}</td>
          <td>{{asset.assetlabel}}</td>
          <td i18n>{{asset.description}}</td>
        </tr>
      </tbody>
    </table>

I considered using this solution:


    <table class="asset-table">
      <thead>
        <tr>
          <th i18n="@@alarm-list-timeon">Time On</th>
          <th i18n="@@alarm-list-timeoff">Time Off</th>
          <th i18n="@@alarm-list-asset">Asset</th>
          <th i18n="@@alarm-list-description">Description</th>
        </tr>
      </thead>
      <tbody *ngIf="showAssets">
        <tr *ngFor="let asset of pageItems">
          <td>{{asset.timeon}}</td>
          <td>{{asset.timeoff}}</td>
          <td>{{asset.assetlabel}}</td>
          <td i18n="@@{{asset.description}}">{{asset.description}}</td>
        </tr>
      </tbody>
    </table>

However, it turned out to be inaccurate. Do you have any suggestions?

Answer №1

Initially, the i18n attribute represents an ID that remains fixed.

Subsequently, when dealing with translating dynamic content, my only effective strategy has been to utilize NgSwitch in the template.

In a practical scenario, let's say you have a variable called thingStatus, which can be 'good', 'bad', or 'unknown'. Each of these would require its own translation item with a unique i18n ID value.

This approach may not work if there are countless possible values for thingStatus.

    <div [ngSwitch]="thingStatus">
        <p *ngSwitchCase="good" i18n="status_good>Good</p>
        <p *ngSwitchCase="bad" i18n="status_bad>Bad</p>
        <p *ngSwitchCase="unknown" i18n="status_unknown>Unknown</p>
    </div>

Answer №2

Follow this example for creating the specified construction

<span
  i18n="status text|Status text@@statusText"
>{
  asset.statusLangCode, select,

  bad {Bad}
  good {Good}

  other {Unknown}
}</span>

In the translation file, a similar construct will be automatically generated (target is manually added)

<source>{VAR_SELECT, select, good {Good} bad {Bad} other {Unknown}}</source>
<target>{VAR_SELECT, select, good {Хороший} bad {Плохой} other {Неизвестный}}</target>

For additional information, refer to https://angular.io/guide/i18n#translate-select

Answer №3

When your backend service provides a list of possible values, you can incorporate them in the following way:

const options = ['superuser', 'moderator', 'guest']

Include the translated terms in translations.json, mapping them to their respective keys from the previous array.

role: {
  "superuser": "Super User",
  "moderator": "Moderatör",
  "guest": "Konuk"
}

Utilize the translations in your main.component.html

<div *ngFor="let option of options">
{{ ('role.' + option) | translate }}
</div>

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