null return this._getRadioChildren().indexOf(item); = 0 && index < children.length) ? children[index] : null; ]]> if (this.disabled) event.preventDefault(); this.selectedItem = this.focusedItem; this.selectedItem.doCommand(); // Prevent page from scrolling on the space key. event.preventDefault(); this.checkAdjacentElement(false); event.stopPropagation(); event.preventDefault(); // left arrow goes back when we are ltr, forward when we are rtl this.checkAdjacentElement(document.defaultView.getComputedStyle( this, "").direction == "rtl"); event.stopPropagation(); event.preventDefault(); this.checkAdjacentElement(true); event.stopPropagation(); event.preventDefault(); // right arrow goes forward when we are ltr, back when we are rtl this.checkAdjacentElement(document.defaultView.getComputedStyle( this, "").direction == "ltr"); event.stopPropagation(); event.preventDefault(); this.removeAttribute("focused"); this.focusedItem = null;