javascript - jQuery How to detect if file is being currently uploading (event is runing) -

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i written code:

var fi = self.find('.file');  fi.on('change', function() {      if(fi.prop('files').length === 1) {         var file = fi.prop('files')[0],             name = file.name,             ext = name.split('.').pop().tolowercase(),             size = (file.size / 1048576).tofixed(2),             type = file.type;          if($.inarray(ext, ['jpg', 'png', 'gif']) == -1) {             return false;         }          if($.inarray(type, ['image/jpeg', 'image/png', 'image/gif']) == -1) {             return false;         }          if(size > 1.2) {             return false;         }          ajax(createdata(file));         return false;     }      return false; });

i allowing upload 1 file @ time ( html side, js side , php side of view ), script if user selects bigger size file, lets 2+ mb , fast clicker can select file , creates second event , both files being uploaded server causes chaos , problems. implementing drag , drop upload option beginner javascript coder im asking community if there way to:

  1. prevent triggering script while file being uploaded ( dont mean methods hide input or diable or take off event listener while, mean method detects if event running , prevent executing script ). tried things default prevent or stop propagation these dont work obviously.

  2. adding button cancel on going script ( meaning stop file uploading , "clean up" user can safetly try again )

thank in advance hints , guidance ;)

i worked on 1 of side projects. here's code sample:

            var filereader = new filereader();             var filefilter = /^(?:image\/bmp|image\/cis\-cod|image\/gif|image\/ief|image\/jpeg|image\/jpeg|image\/jpeg|image\/pipeg|image\/png|image\/svg\+xml|image\/tiff|image\/x\-cmu\-raster|image\/x\-cmx|image\/x\-icon|image\/x\-portable\-anymap|image\/x\-portable\-bitmap|image\/x\-portable\-graymap|image\/x\-portable\-pixmap|image\/x\-rgb|image\/x\-xbitmap|image\/x\-xpixmap|image\/x\-xwindowdump)$/i;              var imageobject = { valid: false };                   filereader.onload = function (filereaderevent) {                     imageobject.data = filereaderevent.target.result;                 };                  var loadimage = function() {                     if (element[0].files.length === 0) {                         return;                     }                      var file = element[0].files[0];                      imageobject.filename = file.name;                      if (!filefilter.test(file.type)) {                         imageobject.error = 'you must select valid image!';                         imageobject.valid = false;                         return;                     }else{                         imageobject.error = '';                         imageobject.valid = true;                     }                      filereader.readasdataurl(file);                 };                  element.on('change', loadimage);         }

this angularjs project i've removed angular components should pretty easy add in necessary jquery code.


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