Three questions regarding JS, Ajax and resourceURL in Liferay

[6年前 に Pablo Yuste Soto によって更新されました。]

Hi!

I'm performing an Ajax operation that loads an image in base64 and paints it in a div. After struggling with the path thingy and a few more things, it began to work, but I'm having a problem, aswell some questions about what's going on here. I think they aren't hard questions, though I don't find any info about them:

1. (Problem): I load the image and it gets shown, which is great, but... the page automatically reloads after that. How can I prevent that?
2. (Question): Can I use ES6 in Liferay's JS? Promises, "let", .map(), etc, in AUI() methods?
3. (Question): What's the correct way of working with paths? Currently, I'm providing the full path to the image, but I would want something more dynamic, something that lets me know the portlet's root path. I'll be ok with that.

Also, this is my code, in case you wondered:

The JS:

function ajaxCall(){
    AUI().use('aui-io-request', function(A){
        A.io.request('${imagen}', {
               method: 'post',
               on: {
                   	success: function() {
                        console.log("Respuesta: ", this.get('responseData'));
                        var bytes = this.get('responseData');
                        var img = getImage(bytes);
                        document.getElementById("imageTest")
                        	.append(img);
                    }
              }
        });
    });
}

The serveResource method:

    @Override
	public void serveResource(ResourceRequest resourceRequest,
			ResourceResponse resourceResponse) throws IOException,
			PortletException {
		try {
		resourceResponse.setContentType("image/jpeg");
		PrintWriter out = resourceResponse.getWriter();
		BufferedInputStream input = new BufferedInputStream(new FileInputStream("C:\\Eclipse\\com.liferay.portal.plugins.sdk-1.0.11-withdependencies\\portlets\\PortletConsumidor-portlet\\docroot\\html\\portletconsumidor\\image.jpg"));
		int b = 0;
		while((b = input.read()) != -1){
			out.write(b);
		}
		out.flush();
		super.serveResource(resourceRequest, resourceResponse);
		}catch(IOException e) {
			System.out.println("ERROR: "+e.getMessage());
		}
	}

Thank you!