calling alert box from code behind java in jsf

Question

I have a requirement to update the properties file based upon the input provided by the user in the jsf page. After updating the file, user session should be cleared and alert box should say 'setting has been updated' and the page should navigate to the login page.

I don't know how to call a alert box from java code. I found this to be possible in asp.net. I searched google, but didn't get any possible solution

How can I make this possible?

All possible solutions are welcome. Thanks in advance.

UPDATE @balusc thanks for your pointer. I am using JSF RI 1.2 and Richfaces 3.3.2

Answer 1

Something like this

<%

ExternalContext ectx = FacesContext.getCurrentInstance().getExternalContext();
HttpServletResponse response = (HttpServletResponse)ectx.getResponse();
HttpSession session = (HttpSession)ectx.getSession(false);
session.invalidate(); 
%>
<script type="text/javascript">
alert('Setting has been updated');
location.replace('/index.jsp');
</script>

Answer 2

You can use PrimeFaces dialog.

PrimeFaces is an open source of components that enhance GUI and development.

The dialog has action listener on buttons, so when the user approves reading the dialog, you can redirect him to any page the you need.

Answer 3

For displaying alert-box you can use below code in your bean :

JavascriptContext.addJavascriptCall(facesContext, "alert('Setting has been updated');");

Clearing the session :

HttpSession session = (HttpSession)FacesContext.getCurrentInstance().getExternalContext().getSession(false);
session.invalidate();

Answer 4

Use the rich:modalPanel with the showWhenRendered attribute set to a boolean property of your managed bean. Then just reRender the parent of the modal panel after your call.

List of attributes for modal panel

Eg:

<a4j:outputPanel id="modalParent">
   <rich:modalPanel showWhenRendered="#{bean.someBooleanValue}">

   </rich:modalPanel>
</a4j:outputPanel>

And your button/link would have reRender="modalParent"

Answer 5

I managed to solve this problem by using 'oncomplete' attribute in a4j commandbutton. 'oncomplete' attribute is used to call javascript function after the server side process is completed.

After completing the server side process, I called a javascript function which called an alert box and using

document.location="../login.jsf";

I navigated to the login page.

Any suggestions regarding this solution is welcome.

Thanks every one for the answers and comments.