How to import jQuery to Angular2 TypeScript projects?

Question

I want to wrap some jQuery code in an Angular2 directive.

I installed jQuery library for Typings into my project with the following command:

typings install dt~jquery --save --global

So now i have jquery folder under typings/global folder in my project directory. In addition the following new line has been added to my typings.json file:

{
    "globalDependencies": {
        "core-js": "registry:dt/core-js#0.0.0+20160602141332",
        "jasmine": "registry:dt/jasmine#2.2.0+20160621224255",
        "node": "registry:dt/node#6.0.0+20160807145350",
        "jquery": "registry:dt/jquery#1.10.0+20160908203239"
    }
}

I started to write a new Angular2 directive (that I imported into app-module file) but I do not know how to correctly import jQuery library. Here is my source file:

import {Directive} from '@angular/core';

@Directive({
    selector: "my-first-directive"
})

export class MyFirstDirective {
    constructor() {
        $(document).ready(function () {
            alert("Hello World");
        });
    }
}

But I can't use nor $ nor jQuery. What is the next step?

Answer 1

Step 1: get jquery in your project

npm install jquery

Step 2: add type for jquery

npm install -D @types/jquery

Step 3: Use it in your component!

import * as $ from 'jquery';

Ready to use $!

Answer 2

If you are using "@angular/cli" then install:

npm install jquery --save

Second step install:

install: npm install @types/jquery --save-dev

And find your file name in "angular-cli.json" on the root and add the inside of as like:

script:["../node_modules/jquery/dist/jquery.min.js"]

Now it will work.

Answer 3

jQuery.service.ts

 import { OpaqueToken } from '@angular/core'
export let JQ_TOKEN = new OpaqueToken('jQuery');

index.ts`

export * from './jQuery.service';

app.module.ts

declare let jQuery : Object;

@NgModule({
  providers: [
    { provide: TOASTR_TOKEN, useValue: toastr },
    { provide: JQ_TOKEN, useValue: jQuery },
})
export class AppModule { }

how to use Jquery in component

   import { Component, Input, ViewChild, ElementRef, Inject } from '@angular/core'
import { JQ_TOKEN } from './jQuery.service'

@Component({
  selector: 'simple-modal',
  template: `
  <div id="{{elementId}}" #modalcontainer class="modal fade" tabindex="-1">
    <div class="modal-dialog">
      <div class="modal-content">
        <div class="modal-header">
          <button type="button" class="close" data-dismiss="modal"><span>&times;</span></button>
          <h4 class="modal-title">{{title}}</h4>
        </div>
        <div class="modal-body" (click)="closeModal()">
          <ng-content></ng-content>
        </div>
      </div>
    </div>
  </div>
  `,
  styles: [`
    .modal-body { height: 250px; overflow-y: scroll; }
  `]
})
export class SimpleModalComponent {
  @Input() title: string;
  @Input() elementId: string;
  @Input() closeOnBodyClick: string;
  @ViewChild('modalcontainer') containerEl: ElementRef;

  constructor(@Inject(JQ_TOKEN) private $: any) {}

  closeModal() {
    if(this.closeOnBodyClick.toLocaleLowerCase() === "true") {
      this.$(this.containerEl.nativeElement).modal('hide');
    }
  }
}