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POUsing a commandButton in a jsf Page to download a file
 

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    <p>Using a commandButton in a jsf Page to download a file. Using: JSF &amp; Richfaces.</p> <p>I have a table (extends ExtendedDataModel implements Modifiable, Serializable) with some data and in each row a button "download".</p> <pre><code>&lt;a4j:commandButton id="getDownload" value="download" style="margin-left:10px;margin-right:10px;width:100px;" action="#{controller.download}" immediate="true" ajaxSingle="true"&gt; &lt;f:setPropertyActionListener target="#{controller.idString}" value="#{item.id}" /&gt; &lt;/a4j:commandButton&gt; </code></pre> <p>I have to build the file in the controller:</p> <pre><code>public void download(){ OutputStream out = null; .... FacesContext fc = FacesContext.getCurrentInstance(); HttpServletResponse response = (HttpServletResponse) fc.getExternalContext().getResponse(); out = response.getOutputStream(); ZipOutputStream zipout = new ZipOutputStream(out); ..... zipout.close(); response.setContentType("application/octet-stream"); response.addHeader("Content-Disposition", "attachment; filename=\""+filename+"\""); out.flush(); .... } finally { try { if (out!=null){ out.close(); } FacesContext.getCurrentInstance().responseComplete(); } catch (IOException e) { logger.error(e); } } ... } </code></pre> <p>The Problem started, when I implemented the ExtendedDataModel my self. At first i used h:commandLink, but the controller method was never called... i tried and tried... now the correct method is called, but the (zip) file content is displayed in the page. I want a button/link in the page, which the user can click to download the file. The page itself should not change. Any ideas? </p> <p>I can create a servlet, but i do not understand why the ExtendedDataModel changed the behavior of the links inside.</p> <p><strong>Edit1</strong></p> <p>I used </p> <pre><code>&lt;h:commandLink id="getDownload" value="download" action="#{controller.download}"&gt; &lt;f:setPropertyActionListener target="#{controller.idString}" value="#{item.id}" /&gt; &lt;/h:commandLink&gt; </code></pre> <p>before. It works with the "normal" richfaces table, but not when i used it inside my own table which extends ExtendedDataModel. </p> <p><strong>Edit 2 - Solution/Workaround</strong></p> <p>It is impossible to use the h:commandButton, .. Link... whatever inside of the self made table, to download a file. I am now using one button in the table to render a new PanelGroup and a second button inside of the new PanelGroupt to download the file. I googled a lot for this, seems like a rich faces bug.</p>
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