Method load

third_party/subscriptions-project/swg.js:15380–15418

* Creates a hidden iframe for logging and appends it to the top level * document.

()

   * document.
   */
  static load() {
    if (iframe) {
      return;
    }
    const initOptions =
        /** @type {!PaymentOptions} */ (window['gpayInitParams']) || {};
    environment = initOptions.environment || Constants.Environment.PRODUCTION;
    iframe = document.createElement('iframe');
    // Pass in origin because document.referrer inside iframe is empty in
    // certain cases
    // Can be replaced by iframe.src=... in non Google context.
    iframe.src = PayFrameHelper.getIframeUrl_(
            window.location.origin,
            initOptions.merchantInfo && initOptions.merchantInfo.merchantId);
    PayFrameHelper.postMessage({
      'eventType': PostMessageEventType.LOG_PAY_FRAME_REQUESTED,
      'clientLatencyStartMs': Date.now(),
    });
    iframe.height = '0';
    iframe.width = '0';
    iframe.style.display = 'none';
    iframe.style.visibility = 'hidden';
    iframe.onload = function() {
      PayFrameHelper.postMessage({
        'eventType': PostMessageEventType.LOG_PAY_FRAME_LOADED_WITH_ALL_JS,
        'clientLatencyStartMs': Date.now(),
      });
      PayFrameHelper.iframeLoaded();
    };
    // If the body is already loaded, just append the iframe. Otherwise, we wait
    // until the DOM has loaded to append the iframe, otherwise document.body is
    // null.
    if (document.body) {
      PayFrameHelper.initialize_();
    } else {
      document.addEventListener(
          'DOMContentLoaded', () => PayFrameHelper.initialize_());
    }
  }

  /**
   * Appends the iframe to the DOM and updates the post message service.