Custom Angular2 Directive: Transforming Element Content Like a Pro

Question about Modifying Content with Angular2:

I am currently working on implementing a translation functionality for my project. My goal is to pull data from a database, load it into a local object, and update all translated object values dynamically. Initially, I tried using a pipe for this task, but encountered issues with updating the value when new translations are added without compromising performance. This led me to explore using a custom directive as an alternative solution, despite its more extensive code footprint.

Approach Tried:

The directive I have created looks like this:

@Directive({
    selector: '[i18n]'
})
export class I18nDirective
{
    @Input() set i18n(key: string) {
        // Code snippet for updating innerHTML content with translations
    }

    public constructor(
        private el: ElementRef,
        private templateRef: TemplateRef<any>,
        private viewContainer: ViewContainerRef,
        private renderer: Renderer,
    ) { }
}

Despite trying various combinations of updating the tag's content within the directive, I have not been successful in achieving the desired outcome.

An example usage of the tag with the directive looks like this:

<span class="..." *i18n="'translation-page-title'"></span>

I am seeking advice on how to dynamically change the innerHTML of a tag containing the directive, especially with regards to changing it based on language preferences.

Thank you for your assistance!

Answer №1

Utilizing the * symbol before a directive will automatically enclose the content between the opening and closing tags within

<template>...</template>
. These tags are protected from browsers, allowing you to modify the content as needed. You can then inject it into the directive using TemplateRef and make modifications using createEmbeddedView. If this functionality is not required, simply remove the * and utilize Renderer to adjust the content. Check out this live example for reference without Translations.

Answer №2

My understanding is that Translations.get(key) operates asynchronously and could be a Promise, Observable, or another function that utilizes a callback mechanism. If this is true, you must ensure that the data retrieval is completed before proceeding:

Translations.get(key).then(function(data) {
  el.nativeElement.innerHTML;
});

Additionally, consider removing the asterisk from the HTML code:

<span i18n="'translation-page-title'"></span>

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