Focus first text input on Bootstrap modal show

modal-focus.js

(function ($) {
  var _original = $.fn.modal.Constructor.prototype.show;

  function trigger(target, name, relatedTarget) {
    target.trigger($.Event(name, { relatedTarget: relatedTarget }));
  }

  $.extend($.fn.modal.Constructor.prototype, {
    show: function (_relatedTarget) {
      var thisModal = this;
      this.$element.one('shown.bs.modal', function() {
        thisModal.$element.find('[type=text], [type=password]').first().focus();
      });
      return _original.call(this, _relatedTarget);
    }

  });
})(jQuery);