How to Include JS file in ionic 3

Question

Im looking for a way to access a variable from external js file which i included in assets/data folder

below is what i tried

placed test.js in assets/data folder

in test.js added variable testvar = "heloo from external js";

added script tag in src/index.html <script src="assets/data/test.js"></script>

in app.component.ts i added this line after imports;declare var testvar: any;

in constructor added this line to log the value console.log(testvar);

result is error : ERROR ReferenceError: testvar is not defined

so, how can i use my js variable in typescript ?

Answer 1

This solution only worked for me

Put the import js in src/index.html header tag, before the build/polyfills.js and build/main.js (they are in body tag);

Example : I created a file src/assets/test.js with a var testvar, imported in src/index.html and then in src/app/app.component.ts declared declare var testvar;.

test.js

var testvar = "Hello from external js"; 

index.html

...   <link rel="icon" type="image/x-icon" href="assets/icon/favicon.ico">   <link rel="manifest" href="manifest.json">   <meta name="theme-color" content="#4e8ef7">    <!-- cordova.js required for cordova apps -->   <script src="cordova.js"></script>   <script src="assets/js/test.js"></script> //here, not in body ... 

app.componet.ts

declare var testvar;  @Component({    templateUrl: 'app.html' }) export class MyApp {   @ViewChild(Nav) nav: Nav;   constructor(private statusbar : StatusBar,  splashScreen: SplashScreen) {    alert(testvar); ... 

Answer 2

To expand on misha130's answer. You would need to import it into the file you want like this:

import * as test from '../assets/data/test' 

This way you have access to the test variable.

console.log(test.testvar);