jQuery File Upload Validation

PHPMaker User Submitted Tips (PHPMaker)
1

I need to validate if filename contains comma. I added code into jqueryfileupload.js and it works.
Question:
Is there a way to do this without adding code into jqueryfileupload.js ?

// jquery\jqueryfileupload.js
processActions: {
  validate: function(data, options) {
    if (options.disabled) {
      return data;
    }
    var dfd = $.Deferred(), settings = this.options, file = data.files[data.index], fileSize;
    if (options.minFileSize || options.maxFileSize) {
      fileSize = file.size;
    }
    if ($.type(options.maxNumberOfFiles) === "number" && (settings.getNumberOfFiles() || 0) + data.files.length > options.maxNumberOfFiles) {
      file.error = settings.i18n("maxNumberOfFiles");
    } else if (options.acceptFileTypes && !(options.acceptFileTypes.test(file.type) || options.acceptFileTypes.test(file.name))) {
      file.error = settings.i18n("acceptFileTypes");

    // ADDED BLOCK
    } else if (file.name.indexOf(ew.MULTIPLE_UPLOAD_SEPARATOR) !== -1) {
      file.error = 'filename contains comma';
    // -----------

    } else if (fileSize > options.maxFileSize) {
      file.error = settings.i18n("maxFileSize");
    } else if ($.type(fileSize) === "number" && fileSize < options.minFileSize) {
      file.error = settings.i18n("minFileSize");
    } else {
      delete file.error;
    }
    if (file.error || data.files.error) {
      data.files.error = true;
      dfd.rejectWith(this, [ data ]);
    } else {
      dfd.resolveWith(this, [ data ]);
    }
    return dfd.promise();
  }
}

I tried this but fail

// Client Script
$('#x_<fieldname>').on('fileuploadchange', function(e, data){
  $.each(data.files, function (i, file) {
    if (file.name.indexOf(ew.MULTIPLE_UPLOAD_SEPARATOR) !== -1) {
      file.error = 'filename contains comma';
    }
  });
});
2

You may use processQueue, i.e. add your action to $.blueimp.fileupload.prototype.options.processQueue.

3

Below is the working code for custom validation for upload field

// Client Script (Add/Edit Page)
$.blueimp.fileupload.prototype.options.processQueue.push({
  action: 'myValidation',
  always: true,
  disabled: false
});
$.widget('blueimp.fileupload', $.blueimp.fileupload, {
  options: {},
  processActions: {
    myValidation: function (data, options) {
      let dfd = $.Deferred(),
          file = data.files[data.index];
      if (file.name.indexOf(ew.MULTIPLE_UPLOAD_SEPARATOR) !== -1) {
        file.error = 'Filename contains comma';
      }
      if (file.error || data.files.error) {
        data.files.error = true;
        dfd.rejectWith(this, [data]);
      } else {
        dfd.resolveWith(this, [data]);
      }
      return dfd.promise();
    }
  }
});

Thank you.