javascript check max file size upload code example

Example 1: how to get size of folder python

import os

def get_size(start_path = '.'):
    total_size = 0
    for dirpath, dirnames, filenames in os.walk(start_path):
        for f in filenames:
            fp = os.path.join(dirpath, f)
            # skip if it is symbolic link
            if not os.path.islink(fp):
                total_size += os.path.getsize(fp)

    return total_size

print(get_size(), 'bytes')

Example 2: get image file width javascript

<!DOCTYPE HTML>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <title>Get image width using File API</title>
  </head>

  <body>
    <input type='file' onchange="readURL(this);" />

    <script>
      function readURL(input) {
        if (input.files && input.files[0]) {
          var reader = new FileReader();
          reader.onload = function (e) {
            var img = new Image;
            img.onload = function() {
              console.log("The width of the image is " + img.width + "px.");
            };
            img.src = reader.result;
          };
          reader.readAsDataURL(input.files[0]);
        }
      }
    </script>
  </body>
</html>

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