<button 
  class="mod_drawer-btn"
  data-drawer_position="表示位置"
  data-drawer_size="サイズ指定"
  data-drawer_type="一時・常時"
></button>

#mod_drawer {position: relative;}
.mod_drawer-sec {
  margin: auto;
  background: var(--bg-paper);
  box-shadow: var(--shadow-main);
  box-sizing: border-box;
  position: fixed;
  z-index: 10001;
  transition: .25s;
}
/*size*/
.top.xs .mod_drawer-sec ,
.bottom.xs .mod_drawer-sec {
  width: 100%;
  height: 30%;
}
.top.xm .mod_drawer-sec ,
.bottom.xm .mod_drawer-sec {
  width: 100%;
  height: 60%;
}
.top.xl .mod_drawer-sec ,
.bottom.xl .mod_drawer-sec {
  width: 100%;
  height: 90%;
}
.top.fit .mod_drawer-sec ,
.bottom.fit .mod_drawer-sec {width: 100%;}

.left.xs .mod_drawer-sec ,
.right.xs .mod_drawer-sec {
  width: 20%;
  height: 100%;
  top: 0;
}
.left.xm .mod_drawer-sec ,
.right.xm .mod_drawer-sec {
  width: 50%;
  height: 100%;
  top: 0;
}
.left.xl .mod_drawer-sec ,
.right.xl .mod_drawer-sec {
  width: 80%;
  height: 100%;
  top: 0;
}
.left.fit .mod_drawer-sec ,
.right.fit .mod_drawer-sec {
  width: fit-content;
  height: 100%;
  top: 0;
}

/*position*/
.top .mod_drawer-sec {
  top: 0;
  transform: translateY(-100%);
  border-radius: 0 0 10px 10px;
}
.bottom .mod_drawer-sec {
  bottom: 0;
  transform: translateY(100%);
  border-radius: 10px 10px 0 0;
}
.left .mod_drawer-sec {
  left: 0;
  transform: translateX(-100%);
}
.right .mod_drawer-sec {
  right: 0;
  transform: translateX(100%);
}
.mod_drawer-sec.transY {transform: translateY(0)}
.mod_drawer-sec.transX {transform: translateX(0)}

.mod_drawer-set {
  width: 100%;
  height: 100%;
  overflow: auto;
  scrollbar-width: none;
}

.mod_drawer-slider-bar ,
.mod_drawer-slider-bar-btn {
  width: 6px;
  border-radius: var(--radius-round);
}
.mod_drawer-slider-bar {
  height: 100%;
  position: absolute;
  right: 8px;
  transform: scale(.98);
  display: none;
}
.mod_drawer-slider-bar-btn {
  height: 40%;
  background: var(--txt-light);
}

.mod_drawer-close {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-circle);
  color: var(--bg-paper);
  position: absolute;
  right: 8px;
  z-index: 1;
  transition: .2s;
}
.top .mod_drawer-close {top: calc(100% + 8px);}
.bottom .mod_drawer-close {
  bottom: calc(100% + 8px);
  transform: rotate(180deg);
}
.left .mod_drawer-close {
  top: 8px;
  left: calc(100% + 8px);
  transform: rotate(270deg);
}
.right .mod_drawer-close {
  top: 8px;
  right: calc(100% + 8px);
  transform: rotate(90deg);
}
.mod_drawer-close:hover {background: var(--overlay);}

/* persistent */
#root.drawer {
  width: 100%;
  height: 100vh;
  overflow: auto;
  transition: .25s;
}
.persistent .mod_drawer-set {
  border-top: 1px solid var(--line-main);
  scrollbar-width: auto;
  scrollbar-gutter: stable;
}
.persistent .mod_drawer-close {
  min-width: 40px;
  min-height: 40px;
  margin: 8px;
  color: var(--txt-main);
  position: static;
}
.persistent .mod_drawer-close:hover {background: var(--hover);}

.persistent.top .mod_drawer-close,
.persistent.bottom .mod_drawer-close ,
.persistent.left .mod_drawer-close {margin-left: auto;}
.persistent.top .mod_drawer-sec {
  display: flex;
  flex-direction: column;
}
.persistent.top .mod_drawer-set {order: 1;}
.persistent.top .mod_drawer-close {order: 2;}

$bd.on('click','.mod_drawer-btn',function(){
  let $posi = $(this).data('drawer_position');
  let $type = $(this).data('drawer_type');
  let $size = $(this).data('drawer_size');
  let slide = '';
  let overlay = '';
  if($type == 'temporary'){
    slide = '<div class="mod_drawer-slider-bar"><div class="mod_drawer-slider-bar-btn"></div></div>';
    overlay = '<div class="overlay drawer"></div>';
  }

  if($size.match('xs|xm|xl')){
    $bd.append('<section id="mod_drawer" class="'+$posi+' '+$type+' '+$size+'" style="display:none;" data-position="'+$posi+'" data-type="'+$type+'" data-size="'+$size+'">\
    <div class="mod_drawer-sec">\
      '+slide+'\
      <button class="mod_drawer-close center ico-mui">keyboard_double_arrow_up</button>\
      <div class="mod_drawer-set"></div>\
    </div>\
    '+overlay+'\
  </section>');
  } else {
    let size = '';
    if($posi == 'top' || $posi == 'bottom'){size = 'width:100%; height:'+$size+';'}
    else if($posi == 'left' || $posi == 'right'){size = 'width:'+$size+'; height:100%; top: 0;'}

    $bd.append('<section id="mod_drawer" class="'+$posi+'" style="display:none;" data-position="'+$posi+'" data-type="'+$type+'" data-size="'+$size+'">\
    <div class="mod_drawer-sec" style="'+size+'">\
      <div class="mod_drawer-slider-bar"><div class="mod_drawer-slider-bar-btn"></div></div>\
      <button class="mod_drawer-close center ico-mui">keyboard_double_arrow_up</button>\
      <div class="mod_drawer-set"></div>\
    </div>\
    <div class="overlay drawer"></div>\
  </section>');
  }
  $rt.toggleClass('drawerDisp');
  $('.overlay').fadeIn(200);

  //スライドバー
  $('.mod_drawer-set').scroll(function(){
    let $wrap = $(this).parents('#mod_drawer');
    let $slide = $(this);
    let $barBtn = $wrap.find('.mod_drawer-slider-bar-btn');
    let disp_height = $slide.height();
  
    // スクロールバー移動可能量(スライダー表示幅 - スライダー幅) / スクロール可能量(スライダー全幅 - スライダー表示幅)
    let offset = $(this).scrollTop() * (disp_height - $barBtn.height()) / ($slide.get(0).scrollHeight - disp_height);
    $barBtn.css('transform', 'translateY(' + offset + 'px)');
  });
});
function drawerOpen(obj){
  let $drawer = $('#mod_drawer');
  let $sec = $('.mod_drawer-sec');
  let posi = $drawer.data('position');
  let trans = 'transX';
  if(posi == 'top' || posi == 'bottom'){trans = 'transY';}

  $('.mod_drawer-set').append(obj);
  $drawer.fadeIn(250);
  $sec.addClass(trans);
  if($('.mod_drawer-set').children().height() > $sec.height()){
    $('.mod_drawer-slider-bar').show();
  }

  if($drawer.data('type') == 'persistent'){
    let ws = $win.scrollTop();
    $rt.addClass('drawer').css('transition','.25s');

    let scale = $sec.height();
    if(posi == 'top'){
      $rt.css({
        'height':'calc(100vh - '+scale+'px)',
        'margin-top':scale
      })
      if(ws>scale){
        $rt.css('transition','0s').scrollTop(ws+scale);
      } else {
        $rt.scrollTop(ws);
      }
    } else if(posi == 'bottom'){
      $rt.css('height','calc(100vh - '+scale+'px)').scrollTop(ws);
    } else if(posi == 'left'){
      $rt.css('padding-left',$sec.width()).scrollTop(ws);
    } else if(posi == 'right'){
      $rt.css('width','calc(100% - '+$sec.width()+'px)').scrollTop(ws);
    }
  } else {
    noscroll();
  }
}
function drawerClose(){
  $('.mod_drawer-sec').removeClass('transY transX');
  $('.overlay').fadeOut(250);
  let close = function(){
    $('#mod_drawer').remove();
    $rt.removeClass('drawer');
  }

  if(!$('.noscroll')[0]){
    let rs = $rt.scrollTop();
    $rt.removeAttr('style').toggleClass('drawerDisp');
    setTimeout(function(){
      close();
      $('body,html').scrollTop(rs);
    },300);
  } else {
    setTimeout(function(){
      noscroll();
      close();
    },300);
  }
}
$bd.on('click','.overlay.drawer ,.mod_drawer-close',function(){drawerClose();});