This recipe will continue with the discussion on RequestContext that we began in the previous recipes. There may be cases where we need values from backing beans in AJAX callbacks. Let's suppose we have a form in a dialog; when the user submits the form, the dialog should stay open to display any validation errors and it should be closed otherwise.
In this recipe, we will learn how the described task can be done with AJAX callback parameters. We will develop an oncomplete callback for a command button within p:dialog.
The developed page contains a Dialog component with an input field. The dialog will be visible when the page is loaded. There is only one valid input value, PrimeFaces Cookbook. When the user inputs this value and clicks on the Save button, the dialog should be closed. In any other case, it should stay open. The p:commandButton button defines handleComplete(xhr, status, args), an oncomplete callback. It...