this.Nav = function()

in static/api/cpp/3.6.x/search/search.js [508:563]
55 lines of code
22 McCabe index (conditional complexity)

  this.Nav = function(evt,itemIndex) {
    const e  = (evt) ? evt : window.event; // for IE
    if (e.keyCode==13) return true;
    if (!this.ProcessKeys(e)) return false;

    if (this.lastKey==38) { // Up
      const newIndex = itemIndex-1;
      let focusItem = this.NavPrev(newIndex);
      if (focusItem) {
        let child = this.FindChildElement(focusItem.parentNode.parentNode.id);
        if (child && child.style.display == 'block') { // children visible
          let n=0;
          let tmpElem;
          for (;;) { // search for last child
            tmpElem = document.getElementById('Item'+newIndex+'_c'+n);
            if (tmpElem) {
              focusItem = tmpElem;
            } else { // found it!
              break;
            }
            n++;
          }
        }
      }
      if (focusItem) {
        focusItem.focus();
      } else { // return focus to search field
        document.getElementById("MSearchField").focus();
      }
    } else if (this.lastKey==40) { // Down
      const newIndex = itemIndex+1;
      let focusItem;
      const item = document.getElementById('Item'+itemIndex);
      const elem = this.FindChildElement(item.parentNode.parentNode.id);
      if (elem && elem.style.display == 'block') { // children visible
        focusItem = document.getElementById('Item'+itemIndex+'_c0');
      }
      if (!focusItem) focusItem = this.NavNext(newIndex);
      if (focusItem)  focusItem.focus();
    } else if (this.lastKey==39) { // Right
      const item = document.getElementById('Item'+itemIndex);
      const elem = this.FindChildElement(item.parentNode.parentNode.id);
      if (elem) elem.style.display = 'block';
    } else if (this.lastKey==37) { // Left
      const item = document.getElementById('Item'+itemIndex);
      const elem = this.FindChildElement(item.parentNode.parentNode.id);
      if (elem) elem.style.display = 'none';
    } else if (this.lastKey==27) { // Escape
      e.stopPropagation();
      searchBox.CloseResultsWindow();
      document.getElementById("MSearchField").focus();
    } else if (this.lastKey==13) { // Enter
      return true;
    }
    return false;
  }