Translate json arrays with angular ngx-translate - json

Question

I have a long text to be translated in an Ionic 4 app. I am using angular ngx-translate (#ngx-translate v11.0.1).
To improve readability I would like to have the translation in multiples lines instead of one.
I have changed my i18n json, from this (en-US.json):
"common-questions-content" : "<b>Question 1?</b> Answer 1 <br> <b>Question 2?</b> Answer 2 <b>Question 3?</b> Answer 3",
To this:
"common-questions-content" : [
"<b>Question 1?</b> Answer 1 <br>",
"<b>Question 2?</b> Answer 2 <br>",
"<b>Question 3?</b> Answer 3"
],
Unexpectedly this works! But, it puts commas between every value of the array:
I load the translation service in my app.component.ts:
import {TranslateService} from '#ngx-translate/core';
...
private translateService: TranslateService,
...
this.translateService.use('en-US');
Finally I use it in my html page like that:
{{ 'common_questions' | translate }}
Is it possible to change this behavior and just show all the text without commas?

Answer 1

I would recommend you to have one single input per statement and without html tags int the translations such as :
in your en.JSON :
"QUESTION_1":"blabla",
"QUESTION_2":"blabla",
"QUESTION_3":"blabla",
"ANSWER_1":"blabla",
"ANSWER_2":"blabla",
"ANSWER_3":"blabla",
Then in your component, create two class properties of type array like so:
public questions : string[];
pulbic answers : string[];
constructor (private translate: TranslateService) {
translate.get(["QUESTION_1", "QUESTION_2", "QUESTION_3"]).subscribe(
values => {
this.questions = Object.keys(values).map(key => values[key]);
}
);
translate.get(["ANSWER_1", "ANSWER_2", "ANSWER_3"]).subscribe(
values => {
this.answers = Object.keys(values).map(key => values[key]);
}
);
}
Then in your html display, customize, add click events or whatever you need :
<ion-grid>
<ion-row>
<ion-col col-6>
<ion-grid>
<ion-row *ngFor="let q of questions"><b>{{q}}</b></ion-row>
</ion-grid>
</ion-col>
<ion-col col-6>
<ion-grid>
<ion-row *ngFor="let a of answers">{{a}}</ion-row>
</ion-grid>
</ion-col>
</ion-row>
</ion-grid>
This is basic html implementation, but you see how much potential is left for you to use. you can define click events, animations, colors, selected items and so on..

Answer 2

A more cleaner solution which:
avoids creating unhanded subscriptions,
is reusable across different components
is to create a custom pipe:
import { Pipe, PipeTransform } from '#angular/core';
import { TranslatePipe } from '#ngx-translate/core';
#Pipe({
name: 'translateList',
})
export class TranslateListPipe extends TranslatePipe implements PipeTransform {
transform(key: any, length: number): any[] {
return [...Array(length).keys()].map((i) => super.transform(`${key}.${i}`));
}
}
And use it like so in any template with help of NgFor:
<div *ngFor="let item of 'TRANSLATION_KEY' | translateList:2">{{ item }}</div>
Where TRANSLATION_KEY is key that hols an array of 2 strings:
"TRANSLATION_KEY": ["hello", "world"]
This custom pipe extends ngx-translate's own TranslatePipe and uses super.transform(...) call under the hood, so all translation heavy lifting is still handled by ngx-translate.