you probably have a plethora of solutions now, however I wanted to use the BASIC plugin for the jquery uploader, i.e. without any other scripts.. for some reason the maxFileSize/fileTypes options were not working - however that is mostly no doubt to my lack of reading the documentation!
Anyway for me, it was as quick as doing the following:
add: function (e, data) { var goUpload = true; var uploadFile = data.files[0]; if (!(/\.(gif|jpg|jpeg|tiff|png)$/i).test(uploadFile.name)) { common.notifyError('You must select an image file only'); goUpload = false; } if (uploadFile.size > 2000000) { // 2mb common.notifyError('Please upload a smaller image, max size is 2 MB'); goUpload = false; } if (goUpload == true) { data.submit(); } },
So just using the ADD option to only allow the image types in the regex, and checking (in my case) the file size is a max of 2mb.
Rather basic, and again I am sure the maxFileSize options work, just I am only including the basic plugin script jquery.fileupload.js
EDIT I should have added in my case I am uploading just one file (a profile image) so hence the data.files[0].. you could iterate through the files collection of course.