Function checkInstalled

demo/src/demo.js:60–81

()

  checkInstalled();

  function checkInstalled() {
    switch (browser) {
      case 'chrome':
      case 'opera': {
        chrome.runtime.sendMessage(EXT_ID, { message: 'version' }, (resp) => {
          if (resp) {
            setInstalled();
          }
        });
        break;
      }
      case 'mozilla': {
        let timer = setInterval(() => {
          if (document.body.getAttribute('data-github-hovercard')) {
            setInstalled();
            clearTimeout(timer);
          }
        }, 100);
        break;
      }
    }
  }

  function setInstalled(isInstalledNow) {
    $installBtn.text('Installed').prop('disabled', true).addClass('disabled');