How to use the primeng/dom.DomHandler.getOuterHeight function in primeng

render() {
        this.panels = DomHandler.find(this.panelWrapper, 'li.ui-galleria-panel'); 
        
        if(this.showFilmstrip) {
            this.frames = DomHandler.find(this.strip,'li.ui-galleria-frame');
            this.stripWrapper.style.width = DomHandler.width(this.panelWrapper) - 50 + 'px';
            this.stripWrapper.style.height = this.frameHeight + 'px';
        }
        
        if(this.showCaption) {
            this.caption = DomHandler.findSingle(this.container,'div.ui-galleria-caption');
            this.caption.style.bottom = this.showFilmstrip ? DomHandler.getOuterHeight(this.stripWrapper,true) + 'px' : 0 + 'px';
            this.caption.style.width = DomHandler.width(this.panelWrapper) + 'px';
        }
   
        if(this.autoPlay) {
            this.startSlideshow();
        }
        
        this.container.style.visibility = 'visible';
    }