onBeforeFileUpload

fires before file uploading has started

mode	string	the mode in which uploader is used (read more about uploader modes here)
loader	XMLHttpRequest	XMLHttpRequest object related to the data loading
formData	object	optional, form config

Example

myForm.attachEvent("onBeforeFileUpload",function("html5",loader,formData){
    // your code here
    return true;
});

returning false will cancel the 'upload' operation

added in version 5.1

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