martin-g commented on a change in pull request #467:
URL: https://github.com/apache/wicket/pull/467#discussion_r609576034
##########
File path:
wicket-core/src/main/java/org/apache/wicket/markup/html/form/upload/FileUploadField.java
##########
@@ -47,6 +57,74 @@
{
private static final long serialVersionUID = 1L;
+ /**
+ * {@link org.apache.wicket.ajax.form.OnChangeAjaxBehavior} that
streams back to server properties
+ * of the selected file (at client side), even when file has not yet
being uploaded.
+s *
+ * @author Ernesto Reinaldo Barreiro ([email protected]).
+ */
+ public static abstract class OnFileSelectedBehavior extends
OnChangeAjaxBehavior
+ {
+ private static final long serialVersionUID = 1L;
+
+ @Override
+ protected void onBind() {
+ super.onBind();
+ Component component = getComponent();
+ if (!(component instanceof FileUploadField))
+ {
+ throw new WicketRuntimeException("Behavior " +
getClass().getName()
+ + " can only be added to an
instance of a FileUploadField");
+ }
+ }
+
+ @Override
+ protected void onUpdate(AjaxRequestTarget target)
+ {
+ Request request = RequestCycle.get().getRequest();
+ IRequestParameters parameters =
request.getRequestParameters();
+ String fileName =
parameters.getParameterValue("fileName").toString();
+ long fileSize =
parameters.getParameterValue("fileSize").toLong(0);
+ Date lastModified = new
Date(parameters.getParameterValue("lastModified").toLong(0));
+ String mimeType =
parameters.getParameterValue("mimeType").toString();
+ onFileSelected(target, fileName, fileSize,
lastModified, mimeType);
+ }
+
+ /**
+ * Called when a file, at client side is selected.
+ *
+ * @param target The {@link
org.apache.wicket.ajax.AjaxRequestTarget}
+ * @param fileName The client file name
+ * @param fileSize The client file size
+ * @param lastModified The {@link java.util.Date} when file was
last modified.
+ * @param mimeType The MIME type of file.
+ */
+ protected abstract void onFileSelected(AjaxRequestTarget
target, String fileName, long fileSize,
Review comment:
I think we should think about the `multiple` support now, because later
this method signature may need to be changed to something like `protected
abstract void onFilesSelected(AjaxRequestTarget target, List<FileDescription>)`
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