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export class Sdkloader {
static instance = null;
static getInstance() {
if (this.instance == null) {
this.instance = new Sdkloader();
}
return this.instance;
}
load() : Promise {
if (this._loadPromise != null) { return this._loadPromise; }
this._loadPromise = new Promise((resolve, reject) => {
if (this.testGlobal()) {
resolve();
return;
}
const script = document.createElement('script');
const anchor = document.getElementsByTagName("script")[0] || document.body;
script.type = "text/javascript";
script.async = true;
script.src = 'https://pay.yandex.ru/sdk/v1/pay.js';
script.onload = () => {
this.loopGlobal(() => {
this._loadPromise = null;
resolve();
});
};
script.onerror = () => {
this._loadPromise = null;
script.remove();
reject(new Error('cant load yandex pay sdk library'));
};
anchor.parentNode.insertBefore(script, anchor);
});
return this._loadPromise;
}
loopGlobal(resolve) : void {
if (this.testGlobal()) {
resolve();
return;
}
setTimeout(() => { this.loopGlobal(resolve) }, 100);
}
testGlobal() : boolean {
return window.YaPay?.createPayment != null;
}
}