Handling fileDownloadActionListener in ADF

If you got to work with Download Action Listener in ADF, you will find an issue that, the listener will prompt you to download file even though file is not available. To handle this bug in ADF, we can use Java Script in our JSF page or managed bean. It's little bit tricky, but easy to do it.

Create two buttons in JSF page, one to search file & another one(visible=false) to handle download file:

<af:commandButton text="SearchFile"
                            id="cl1"
                            actionListener="#pageFlowScope.managedBean.searchFile}"                              
                            partialSubmit="true"
                           clientComponent="true"/>
                              
<af:commandButton text="Downloadfile"
                                  id="cb1"
                                  visible="false"
                                  partialTriggers="cl1"
                                  partialSubmit="false"
                                  binding="#{pageFlowScope.managedBean.fileDLButton}"
                                  clientComponent="true">
        <af:fileDownloadActionListener
                     filename="SampleFileName.pdf"
                     contentType="application/pdf; charset=utf-8"
                     method="#{pageFlowScope.managedBean.downloadFile}"/>      
 </af:commandButton>  


Bind button in JSF using accessor method in managed bean:

    public void setfileDLButton(RichCommandButton fileDLButton) {
        this.fileDLButton= fileDLButton;
    }

    public RichCommandButton getfileDLButton() {
        return fileDLButton;
    }

Create two methods in Managed bean to Search & Download file, and in the Search file method use Java Script to trigger second button defined in JSF:

public void searchFile() {
          ............................................................................
     FacesContext fctx = FacesContext.getCurrentInstance();

     String buttonId = getfileDLButton().getClientId(fctx); 

     StringBuilder script = new StringBuilder();

     script.append("var dlButton = AdfPage.PAGE.findComponentByAbsoluteId('" + buttonId + "');");
     script.append("dlEvent = new AdfActionEvent(dlButton);");
     script.append("dlButton.queueEvent(dlEvent, true);");
     ExtendedRenderKitService erks = Service.getService(fctx.getRenderKit(), ExtendedRenderKitService.class);
     erks.addScript(fctx,script.toString());
 }

public void downloadFile(FacesContext context,OutputStream outputStream) {
            ..............................................................................
}