h:commandButton multiple actions: download file and render ajax table

Question

I currently have 2 command buttons and one listbox. Based on listbox selection, the result generated can be shown in a download-able file or rendered as an HTML table. The <

Answer 1

Unfortunately, that's not possible with HTTP. You can send only one response back per request. You cannot merge the response containing the PDF file and the ajax response into one response. Since this is a HTTP restriction, JSF can't do any much for you. Also, downloading a file using Ajax is not possible at all since JavaScript can't force the browser to pop a Save As dialogue nor have any access to local disk file system due to security restrictions.

A workaround would be to fire two HTTP requests on a single button click where the second request returns Content-Disposition: attachment so that the response of the other request keeps untouched. You can achieve this by adding an onclick to the command button.

and create a PDF servlet which roughly look like this FileServlet example. As you see, it's not possible to invoke a JSF action by this. You have to refactor the PDF download method to a HttpServlet class which does the job in doGet() method. For any necessary communication between the JSF managed bean and the servlet, you could use the session scope or pass the desired information (just the PDF file identifier?) by request path or parameter.