Validating s:fileUpload

[Ricardo Preston]

Hi. Using seam/RichFaces, I'm trying to validate a filename when it's selected in a s:fileUpload, before it's submitted.

I can get the method called on onchange(), but the value I've set (the fileName) is still undefined. Is there a way to do this?

Thanks.

		   		<s:decorate id="formSpecDecorate" template="layout/edit.xhtml">
					<ui:define name="label">Form Specification:</ui:define>
					<s:fileUpload id="formUploadField" accept="xls" data="#{UploadRules.formSpecificationData}" 
						maxFilesQuantity="1" value="#{UploadRules.formSpecification}" >
						<a:support event="onchange" action="#{UploadRules.checkFilename}"  />
					</s:fileUpload>
				</s:decorate>

In the UploadRules bean, I have getters & setters for these variables:

    private String formSpecification = null;
    private byte[] formSpecificationData = null;

And the method that gets called when the filename is selected (before it's uploaded by clicking the submit button). Neither variable is set ... and there's my problem. Ideas?

public void checkFilename() {
    	log.info("UploadRules.checkFilename() action called");
    	
    	log.info("    formSpecification  = " + formSpecification);
    	if (formSpecificationData != null)
    		log.info("    formSpec data size = " + formSpecificationData.length);
    }