getting file size in javascript

Question

given a path of a file like  C  file jpg how can i get the size of the file in javascript

User · Answer

You can t get the file size of local files with javascript in a standard way using a web browser   But if the file is accessible from a remote path  you might be able to send a HEAD request using Javascript  and read the Content-length header  depending on the webserver

User · Answer

You cannot   JavaScript cannot access files on the local computer for security reasons  even to check their size   The only thing you can do is use JavaScript to submit the form with the file field to a server-side script  which can then measure its size and return it

User · Answer

You could probably try this to get file sizes in kB and MB Until the file size in bytes would be upto 7 digits  the outcome would be in kbs  7 seems to be the magic number here  After which  if the bytes would have 7 to 10 digits  we would have to divide it by 10  3 n  where n is the appending action   This pattern would repeat for every 3 digits added  let fileSize   myInp files 0  size toString     if fileSize length  lt  7  return    Math round  fileSize 1024  toFixed 2  kb      return     Math round  fileSize 1024  1000  toFixed 2  MB

User · Answer

function findSize         var fileInput    document getElementById  fUpload        try          alert fileInput files 0  size      Size returned in bytes       catch e           var objFSO   new ActiveXObject  Scripting FileSystemObject            var e   objFSO getFile  fileInput value           var fileSize   e size          alert fileSize

User · Answer

Try this one    x000D   x000D  function showFileSize     x000D    let file   document getElementById  file   files 0   x000D    if file    x000D      alert file size     in bytes     x000D      else    x000D      alert  select a file    duh     x000D      x000D    x000D   lt input type  file  id  file   gt  x000D   lt button onclick  showFileSize    gt show file size lt  button gt  x000D   x000D   x000D

User · Answer

If you could access the file system of a user with javascript  image the bad that could happen   However  you can use File System Object but this will work only in IE   http   bytes com topic javascript answers 460516-check-file-size-javascript

User · Answer

If it s not a local application powered by JavaScript with full access permissions  you can t get the size of any file just from the path name   Web pages running javascript do not have access to the local filesystem for security reasons   You can use a graceful degrading file uploader like SWFUpload if you want to show a progress bar   HTML5 also has the File API  but that is not widely supported just yet   If a user selects the file for an input type file  element  you can get details about the file from the files collection   alert myInp files 0  size

User · Answer

To get the file size of pages on the web I built a javascript bookmarklet to do the trick  It alerts the size in kb s  Change the alert to a prompt if you want to copy the filesize   Here s the bookmarklet code for the alert    lt a href  javascript a document getElementsByTagName  HTML   0  outerHTML b a length 1024 c Math round b  alert c   kb     gt Doc Size lt  a gt    Here s the bookmarklet code for the prompt    lt a href  javascript a document getElementsByTagName  HTML   0  outerHTML b a length 1024 c Math round b  prompt  Page Size  c   kb     gt Doc Size lt  a gt    See it in action at http   bookmarklets to g0 to filesize php

User · Answer

You cannot as there is no file input output in Javascript  See here for a similar question posted

[javascript] getting file size in javascript

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