javascript - Cancel uploads in onStatusChange -

in our system allow uploads specific number can done in multiple upload sessions. when number of images in upload session exceed maximum number cancelling uploads in onstatuschange() instead of adjusting itemlimit:

 thumbnailuploader = new qq.fineuploader({   element: document.getelementbyid('thumbnail-fine-uploader'),   template: "qq-simple-thumbnails-template",   request: {     endpoint: 'uploader/uploader.php'   },   thumbnails: {       placeholders: {         waitingpath: "uploader/waiting-generic.png",         notavailablepath: "uploader/not_available-generic.png"       }   },   validation: {       allowedextensions: ['jpeg', 'jpg', 'gif', 'png', 'bmp'],       itemlimit: 6   },   callbacks: {       onsubmit: function(id, filename){         //  console.log("submitting..." + id);         },         onstatuschange: function (id, oldstatus, newstatus) {             // check see if file has been cancelled             // equate uploads being 'completed'.              if(parseint(galleryimages) + id + 1 > maxuploads && newstatus !== qq.status.cancelled){                 this.cancel(id);                 return;             }              if (newstatus === qq.status.cancelled) {                 check_done();                 return;             }         },         oncomplete: check_done,         onupload: startupload     } }); 

this seems work well, when switching on debugger get:

error: [fine uploader 5.0.3] 1 not valid file id upload!

in

now: function(id) { var name = options.getname(id);  if (!controller.isvalid(id)) {    throw new qq.error(id + " not valid file id upload!"); } 

and bunch of:

"[fine uploader 5.0.3] caught exception in 'onstatuschange' callback - element undefined"

can fixed or these messages harmless?

thanks!