Upgrade your AngularJS Directive to an Angular 2.x+ Directive by using an HTML decorator

Question

Upgrade your AngularJS Directive to an Angular 2.x+ Directive by using an HTML decorator

Is it no longer possible to utilize Angular directives as what I like to refer to as "HTML decorators"?

I found this method extremely useful in Angular 1.x when transitioning legacy applications to Single Page Apps by creating a set of directives to enhance markup generated from the server. It seems like an oversight for the Angular Team to remove this capability.

An Example to Illustrate:

For instance, there is a jQuery plugin called chosen for enhanced select boxes. In Angular 1.x, I would typically do the following on a server-rendered page.

HTML:

<select chosen-select>
    <option>1</option>
    <option>2</option>
    <option>3</option>
    <option>4</option>
</select>

JS

app.directive('chosenSelect', [
    function() {
        return {
            restrict: 'AE',
            link: function(scope, element, attributes) {
                $(element).chosen();
            }
        };
    }
]);

This code would effectively apply the chosen plugin to the server-generated HTML, requiring minimal changes apart from setting up ng-app. Is it still possible to achieve this type of directive in Angular 2+?

Thank you

javascript jquery angularjs angular typescript

Answer 1

Answer №1

If you want to achieve the same functionality, you can follow this approach:

import {Directive, ElementRef, OnInit} from '@angular/core';

declare var $: any;

@Directive({selector: '[promoChosenSelect]'})
export class ChosenSelectDirective  implements OnInit{
  constructor(private el: ElementRef) {
  }

  ngOnInit(): void {
    $(this.el.nativeElement).chosen();
  }

}

Include the directive in your module like this:

@NgModule({
  imports: [],
  exports: [
    ChosenSelectDirective
  ],
  declarations: [
    ClickOutsideDirective,
  ],
  entryComponents: [],
  providers: []
 })
 export class SharedModule {
 }

Lastly, add the directive to your HTML template:

 <select promoChosenSelect>
    <option>1</option>
   <option>2</option>
    <option>3</option>
   <option>4</option>
 </select>

Answer 2

If you want to achieve the same functionality, you can follow this approach:

import {Directive, ElementRef, OnInit} from '@angular/core';

declare var $: any;

@Directive({selector: '[promoChosenSelect]'})
export class ChosenSelectDirective  implements OnInit{
  constructor(private el: ElementRef) {
  }

  ngOnInit(): void {
    $(this.el.nativeElement).chosen();
  }

}

Include the directive in your module like this:

@NgModule({
  imports: [],
  exports: [
    ChosenSelectDirective
  ],
  declarations: [
    ClickOutsideDirective,
  ],
  entryComponents: [],
  providers: []
 })
 export class SharedModule {
 }

Lastly, add the directive to your HTML template:

 <select promoChosenSelect>
    <option>1</option>
   <option>2</option>
    <option>3</option>
   <option>4</option>
 </select>

Upgrade your AngularJS Directive to an Angular 2.x+ Directive by using an HTML decorator

Answer №1

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