import { Injectable } from '@angular/core';
interface Scripts {
name: string;
src: string;
}
export const ScriptStore: Scripts[] = [
{ name: 'pdfMake', src: '//cdnjs.cloudflare.com/ajax/libs/pdfmake/0.1.59/pdfmake.min.js' },
{ name: 'vfsFonts', src: '//cdnjs.cloudflare.com/ajax/libs/pdfmake/0.1.59/vfs_fonts.js' }
];
@Injectable({
providedIn: 'root'
})
export class ScriptService {
private scripts: any = {};
constructor() {
ScriptStore.forEach((script: any) => {
this.scripts[script.name] = {
loaded: false,
src: script.src
};
});
}
load(...scripts: string[]) {
const promises: any[] = [];
scripts.forEach((script) => promises.push(this.loadScript(script)));
return Promise.all(promises);
}
loadScript(name: string) {
return new Promise((resolve, reject) => {
// resolve if already loaded
if (this.scripts[name].loaded) {
resolve({ script: name, loaded: true, status: 'Already Loaded' });
} else {
// load script
const script = document.createElement('script');
script.type = 'text/javascript';
script.src = this.scripts[name].src;
script.onload = () => {
this.scripts[name].loaded = true;
console.log(`${name} Loaded.`);
resolve({ script: name, loaded: true, status: 'Loaded' });
};
script.onerror = (error: any) => resolve({ script: name, loaded: false, status: 'Loaded' });
document.getElementsByTagName('head')[0].appendChild(script);
}
});
}
}