{this.props.imageUrls.map(imageUrl=>
            <div key={imageUrl.toString()}
            className="col-md-4 image-item backgrounded"
             onLoad={this.handleImageChange}
            onError={this.handleImageChange}
             style ={ { backgroundImage: "url("+imageUrl+")" } }>             
            </div>
          )}

<div key={imageUrl.toString()}
            className="col-md-4 image-item backgrounded"
             onLoad={this.handleImageChange}
            onError={this.handleImageChange}
             style ={ { backgroundImage: "url("+imageUrl+")" } }>

<Image key={imageUrl.toString()}
             onLoad={this.handleImageChange}
            onError={this.handleImageChange}
             style ={ { backgroundImage: "url("+imageUrl+")" } }>