pdfjs/web/viewer.js
function PDFOutlineViewer_toggleOutlineItem(root, show) {
            this.lastToggleIsShow = show;
            var togglers = root.querySelectorAll('.outlineItemToggler');
            for (var i = 0, ii = togglers.length; i < ii; ++i) {
              togglers[i].classList[show ? 'remove' : 'add']('outlineItemsHidden');
            }
          }
function PDFOutlineViewer_toggleOutlineItem(root, show) {
            this.lastToggleIsShow = show;
            var togglers = root.querySelectorAll('.outlineItemToggler');
            for (var i = 0, ii = togglers.length; i < ii; ++i) {
              togglers[i].classList[show ? 'remove' : 'add']('outlineItemsHidden');
            }
          }
function PDFOutlineViewer_toggleOutlineItem ( root , show ) { this . lastToggleIsShow = show ; var togglers = root . querySelectorAll ( '.outlineItemToggler' ) ; for ( var i = 0 , ii = togglers . length ; i < ii ; ++ i ) { togglers [ i ] . classList [ show ? 'remove' : 'add' ] ( 'outlineItemsHidden' ) ; } }
Toggle the visibility of the subtree of an outline item.

@param {Element} root - the root of the outline (sub)tree.
@param {boolean} show - whether to show the outline (sub)tree. If false,
the outline subtree rooted at |root| will be collapsed.

@private
Toggle the visibility of the subtree of an outline item .