Fine Uploader - the noFilesError don't show - fine-uploader

Question

var manualuploader = new qq.FineUploader({
element: $('#manual-fine-uploader')[0],
request: {
endpoint: '/ViewData/UploadFile'
},
autoUpload: false,
multiple: false,
validation: {
allowedExtensions: ['xlsx']
},
text: {
uploadButton: 'select file',
cancelButton: 'cancel file'
},
messages: {
typeError: '{file} file type error : {extensions}.',
noFilesError: "no files ."
},
failedUploadTextDisplay: {
mode: 'custom',
maxChars: 40,
responseProperty: 'Msg',
enableTooltip: true
},
callbacks: {
onUpload: function (id, name) {
showWaitLayer("uploading ......");
},
onComplete: function (id, name, response) {
closeWaitLayer();
$('input[name=uploadFileName]').val(response.Datas.FILE_0);
}
}
});
I use this code , when i select a 'jpg' file,the typeError will alter;
my question is when the noFilesError will show? i try lots time the noFileError didn't show.

Answer 1

finally,i update to 3.64 version,and before uploadStoredFiles() method i add
var tempA = manualuploader.getUploads({
status: [qq.status.SUBMITTED]
});
if (tempA.length == 0){
alert("no File Error");
return;
}

Answer 2

The documentation on options clearly states:
noFilesError - Text sent to the onError callback (and showMessage if running in FineUploader mode) if a an empty array of files or Blob objects is submitted.
And on callbacks:
onError(String id, String name, String errorReason, XMLHttpRequest xhr) - called whenever an exceptional condition occurs (during an upload, file selection, etc). Note that the last parameter, xhr, will only be included if the error is related to a request initiated by XMLHttpRequest.
If you simply want an error to display when no files have been droppped onto the uploader, add an anonymous function to your onError callback like so:
// ...
callbacks: {
onError: function (id, name, errorReason, xhr) {
alert(errorReason);
}
}
// ...
This will display a simple alert whenever there is an error. You could customize when and how you display your error by manipulating the logic inside of the onError callback.