Struts2 display stream pdf - struts2

Question

I want to display pdf stream in the new popup windows, but when the stream is empty, I want to write a error message in the current page (Edition.jsp)
In the Edition.jsp page :
<s:form id="pdf" action="ExportPdf" theme="simple" target="pageEdition" >
...
<sj:menu name="typeEdition" cssClass="edition" list="listeEditions" />
</s:form>
In struts.xml :
<action name="ExportPdf" class="ExportPdfAction">
<result name="success" type="stream">
<param name="inputName">inputStreamPdf</param>
<param name="contentType">application/pdf</param>
<param name="contentDisposition">filename="myFile.pdf"</param>
<param name="bufferSize">2048</param>
</result>
<result name="error">/WEB-INF/web/Edition.jsp</result>
</action>
javascript, when I click on the menu item edition
$('.edition').bind('click', function(even, data) {
window.open('', 'pageEdition', 'location=no, menubar=no, height=600, width=900' );
$('#pdf').submit();
});
When I return error, I don't want to go in the target page.
Yes, I try it via Ajax JQuery, but now, the problem is for display pdf !
// click on the menu item edition
$('.edition').bind('click', function(event, data) {
$('#pdf').submit();
});
$('#pdf').submit(function(event) {
// stop form from submitting normally
event.preventDefault();
// post with parameters
var posting = $.post( $( this ).attr( 'action' ), $('#pdf').serialize());
// wait results
posting.done(function( data, event ) {
if (data.substring(0,4) != '%PDF') {
alert ("error");
} else {
// the format pdf is recognize, but not display (the stream is in the url, but not in the content)
window.open('data:application/pdf,'+ data, 'pageEdition', 'menubar=no, height=600, width=900' );
}
});
When I use this solution, the stream response (data parameter) is not display correctly. The stream is in the url but not in the content.
I try with :
window.document.write(data);
but it's html content.
How can I display pdf stream in javascript ?
Thanks