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POh:commandLink not firing file download action without f:ajax
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  1. POh:commandLink not firing file download action without f:ajax
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    copied!<p>I have an <code>h:datatable</code> that contains a column with a link that will call the backing bean and "should" return a PDF document generated.</p> <p>The column looks like this : </p> <pre><code>&lt;h:form&gt; ... &lt;h:datatable&gt; ... &lt;h:column &gt; &lt;h:commandLink action="#{bean.downloadPDF}" target="_blank" &gt; &lt;f:param name="value1" value="#{bean.val1}"/&gt; &lt;f:param name="value2" value="#{bean.val2}"/&gt; &lt;f:param name="value3" value="#{bean.val3}"/&gt; &lt;h:graphicImage name="certificate.jpg" library="images"/&gt; &lt;/h:commandLink&gt; &lt;/h:column&gt; ... &lt;/h:datatable&gt; ... &lt;/h:form&gt; </code></pre> <p>I have no javascript errors on my page (according to chrome and firebug). The backing bean looks like this : </p> <pre><code>public void downloadPDF() { ... File outputPDF = new File(outputFileName); //Get ready to return pdf to user BufferedInputStream input = null; BufferedOutputStream output = null; try { // Open file. input = new BufferedInputStream(new FileInputStream(outputPDF), 10240); //Return PDF to user // Init servlet response. response.reset(); response.setHeader("Content-Type", "application/pdf"); response.setHeader("Content-Length", String.valueOf(outputPDF.length())); response.setHeader("Content-Disposition", "inline; filename=\"" + pdfName + "\""); output = new BufferedOutputStream(response.getOutputStream(), 10240); // Write file contents to response. byte[] buffer = new byte[10240]; int length; while ((length = input.read(buffer)) &gt; 0) { output.write(buffer, 0, length); } // Finalize task. output.flush(); } catch(IOException e) { e.printStackTrace(); } finally { output.close(); input.close(); } facesContext.responseComplete(); } </code></pre> <p>Now, I know my PDF generation works because I can create the custom PDF and save it on the drive.</p> <p>Then, if I add <code>&lt;f:ajax/&gt;</code> to the <code>h:commandLink</code> The method is called. Without that, it reloads the current page without the action method ever being called. </p> <p>I have tried a few different things... with or without any <code>f:param</code>s. Adding a <code>String</code> return value to the <code>downloadPDF()</code> function. <strong>EDIT</strong> : Taking away the <code>target="_blank"</code> parameter. Using <code>actionListener</code> instead of <code>action</code>. When using <code>action</code>, the bean method does not get called, but I get this error message in the <code>h:messages</code> : <code>Conversion Error setting value '' for 'null Converter'.</code>.</p> <p>Cannot get it to call the function. What I am hoping to get is that when one clicks on the downloadPDF link, it opens a new window and downloads the PDF.</p> <p>Any help would be greatly appreciated.</p> <h3>EDIT 2 / Solution (temporary)</h3> <p>I have managed to get this working using the attribute <code>immediate="true"</code>. Still havn't found exact field that is giving me the <code>Conversion Error</code>, but am assuming is a field in the form that does not need to be submitted for this specific function.</p>
 

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