spefic category after contact form 7 on submit

hello, i create a form and users select category. I use this code but not working.

document.addEventListener( 'wpcf7mailsent', function( event ) {
  var categoryname = $('input[name="bultenkonusu"]:checked').val();
  var notification = $('input[name="frequency"]:checked').val();

if(notification=="now") {

  console.log("about to initialize Signal"); 
  window.addEventListener('load', function() {
    window._oneSignalInitOptions.promptOptions = {
      slidedown: {
        prompts: [
          {
            type: "category",
            autoPrompt: true,
            text: {
              /* actionMessage limited to 90 characters */
              actionMessage: "Custom action message",
              /* acceptButton limited to 15 characters */
              acceptButtonText: "Yes",
              /* cancelButton limited to 15 characters */
              cancelButtonText: "No",
              /* CATEGORY SLIDEDOWN SPECIFIC TEXT */
              negativeUpdateButton:"Cancel",
              positiveUpdateButton:"Save settings",
              updateMessage: "Update your push notification subscription preferences.",
            },
            delay: {
              timeDelay: 1,//seconds to wait for display
              pageViews: 1,//# pageviews for prompt to display
            },
            categories: [
              {
               <strong> tag: categoryname,
                label: categoryname,</strong>
              }
            ]
          }
        ]
      }
    }
    window.OneSignal = window.OneSignal || [];
    window.OneSignal.push(function() {
      window.OneSignal.init(window._oneSignalInitOptions);
    });
  });

}

});