Can file size validation be done in client for af:inputfile

Question

if you upload a big file with size bigger than the 'org.apache.myfaces.trinidad.UPLOAD_MAX_DISK_SPACE' in web.xml, then it will take a long time to process. finally, a error message is shown in the page, saying "the file is too large". the whole page seems hang during the uploading process.
can this size validation be done in client site before uploading?

Answer 1

Actually our QA had fire a bug for this issue,:
they set proxy and not check the bypass option , then when they upload a 100M size file ,the browser will hung there during the uploading process
and they do believe this is ADF's bug ,no matter how we explain
so we had do some research try to fixed it by ourselves , then here is a workaround may be work ,we have not implemented just have this thinking :
In IE browser we can use the ActiveX to implementation
In FF and Google Chrome we can use the W3C's new API to get the file size:
<input type='file' id='fileinput'>
<script>
var input = document.getElementById('fileinput');
var file = input.files[0];
var fireName = file.name
var fireSize = file.size;
</script>
But I also found in some documents pointed that the Struts and Sprint framework can check the upload file size before the file uploaded , but I do not know how can they do that.
If other framework can do that why ADF can not, then we need to resolve this issue by ourselves?
Edited by: user13152002 on Sep 1, 2011 11:29 PM