Using managed-property with CommandButton in Java Server Faces

Question

In addition to my question \"Creating an “Edit my Item”-page in Java Server Faces with Facelets\" I would liek to cover an issue that this provided.

When I press the com

Answer 1

There are several ways to preserve the ID from the original GET URL. I'm not attempting to be comprehensive.

Add a param to a commandLink

Any time the link is clicked, the ID will be set from parameter.

Use a hidden field

  
  
ID: 
  
Info: 
  

Any time the form is posted, the ID will be set from the form.

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Preserving the URL

Since the form URL does not include the original query, a post will remove the ID from the URL in the browser bar. This can be rectified by use of a server-side redirect after the action has been performed.

  public String save() {
    System.out.println("Saving changes to persistence store: id=" + id);
    redirect();
    return null; // no navigation
  }

  private void redirect() {
    FacesContext context = FacesContext.getCurrentInstance();
    ExternalContext ext = context.getExternalContext();
    UIViewRoot view = context.getViewRoot();
    String actionUrl = context.getApplication().getViewHandler().getActionURL(
        context, view.getViewId());
    try {
      // TODO encode id value
      actionUrl = ext.encodeActionURL(actionUrl + "?ID=" + id);
      ext.redirect(actionUrl);
    } catch (IOException e) {
      throw new FacesException(e);
    }
  }