Very simple scenario , I wanted to display a PDF or an Excel on click of a link/ on submit of a button.
Since wicket offers flavors of ajaxbutton and ajax link one can easily make a mistake of the using them to render the pdf or excel.
I did the same. everything seemed to work unit the point where the response needed to be rendered and i would see a pdf or excel.
The problem was that using an ajax button or link we can only render a ajax response, but in this case i wanted to render a pdf or excel response (bytes).
It only clicked to me after a while of debugging that the browser had no way to identify how to render the ajax response which contained pdf bytes.
Lesson learnt , always use a Normal Button or a link to render the pdf as the web response.
an example would be like this:
Link excelLink = new Link("linForExcel"){
@Override
public void onClick() {
final OutputStream excelOutputStream = methodToReturnTheExcelOutputStream();
final ByteArrayResource byteArrayResource = new ByteArrayResource("application/vnd.ms-excel", ((ByteArrayOutputStream) excelOutputStream).toByteArray());
IResourceStream resourceStream = byteArrayResource.getResourceStream();
getRequestCycle().setRequestTarget(new ResourceStreamRequestTarget(resourceStream) {
public String getFileName() {
return "NameOfExcel.csv";
}
});
}
