When it comes to checking file types in JavaScript, JPEG files are causing issues while PNG files are being

Before uploading files to my server, I always make sure to check the file type. However, I have encountered an issue - the file type check is only effective for png files and not jpeg:

for(var j = 0; j < $files.length; j++) {
  if(!$files[j].type.match('image/png') || !$files[j].type.match('image/jpeg')) {
    $scope.all_files_images = false;
  }
}

Strange thing is that when the file type is image/jpeg, the statement $scope.all_files_images = false; gets executed even though it shouldn't. It works perfectly fine for png files. Upon verifying the file types, everything seems normal.

Answer №1

Your reasoning is flawed. Your code currently checks for conditions like "if it's not a PNG OR it's not a JPG then ..."

However, even if the file is either a PNG or a JPG, the current setup fails because it assumes it cannot be both at the same time. For example, if it is identified as a .png file, it automatically excludes it from being a .jpg file, causing the test to flag it as an error.

To fix this issue, simply switch from using || to &&. This change would result in the condition becoming "if it's not a PNG AND it's not a JPG then ...", which is more accurate.

Answer №2

When using the match() method, make sure to provide a regular expression object instead of a string. For example, use:

match(/gif|png|jpg|jpeg/);

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