duplicate-tab-check.js

duplicate-tab-check.js

const tabCheckBroadcast = new BroadcastChannel("TAB_CHECK");
tabCheckBroadcast.postMessage("FIRST_TAB");
tabCheckBroadcast.onmessage = (event) => {
  if (event.data === "FIRST_TAB") {
    tabCheckBroadcast.postMessage("FIRST_TAB_OPENED");
  }
  if (event.data === `FIRST_TAB_OPENED`) {
    alert("You are not supposed to duplicate the tab");
    //disableApp();
  }
};

function disableApp() {
  document.body.classList.add("disable");
  document.getElementById('maskApp').style.display = 'block';
}