Injector for: https://my.gogoro.com/tw/coupon

gogoro_coupon_inject.js

javascript:
{
  function evtSim(e, idx)
  {
    sel.selectedIndex = idx;
    var evt = document.createEvent("MouseEvents");
    evt.initEvent("change", false, true);
    e.dispatchEvent(evt);
  }
  function inj(plt)
  {
    if (plt != null)
    {
        sel = document.getElementById('mygogoro-plate');
        var opts = sel.options;
        for (var opt, j = 0; opt = opts[j]; j++)
        {
          if (opt.value == plt)
          {
            evtSim(sel, j);
            return;
          }
        }
        var nopt = document.createElement('option');
        nopt.value = plt;
        nopt.innerHTML = plt;
        sel.appendChild(nopt);
        evtSim(sel, sel.length - 1);
    }
  }
  var plt = prompt("車牌號碼 (例：ABC-1234)：", "");
  inj(plt);
}