< input type = " file " > Setup onchange Event Listener with File … At that time, the result attribute contains the data as a data: URL representing the file's data as a base64 encoded string. Interactive API reference for the JavaScript FileReader Object. The first method is implemented using FormData where a multipart/form-data POST request is sent. const file = e.target.files[0] you'll need to do: const file = e.target.files[0] || e.dataTransfer.files[0] to handle both events. File Viewer Lite can open PDFs, word processing documents, spreadsheets, and many other common file types … File Viewer Lite is a universal file opener that allows you to open over 150 file types your Windows PC. Next we setup an event listener for the onload event. FileReader is used to read the contents of a Blob or File.

The following code will generate the file input field. Lo que te falta es muy sencillo: definir lectores para los ficheros, y asignar la acción que se ejecutará cuando se cargue: function handleFileSelect(evt) { var files = evt.target.files; // FileList object var lectores = new Array(); // los lectores // files is a FileList of File objects. The second method is uploading using FileReader where a normal POST request is sent. Once we have determined that the file type is correct we create a new instance of FileReader. That's probably why some of attempts worked, and some didn't - you've just uploaded the file by 2 different ways and only one was working. You can get Files from the HTMLInputElement.files property or the DataTransferItem.getAsFile() method. However, since Java 11 we can specify the type of character encoding (UTF-8 or UTF-16) in the file as well. A file can be uploaded with jQuery in 2 ways. FileReader(File) FileReader(File) Constructs a new FileReader on the given file.. FileReader(FileDescriptor) FileReader(FileDescriptor) Construct a new FileReader on the given FileDescriptor fd.. FileReader(IntPtr, JniHandleOwnership) FileReader(IntPtr, JniHandleOwnership) A constructor used when creating managed representations of JNI objects; called by the runtime. The readAsDataURL method is used to read the contents of the specified Blob or File. Selecting a file through the local device is pretty straightforward, we just have to call the file input type using the HTML element. Within this event listener we add some code that will update the innerText property of fileDisplayArea using the result property from our FileReader . In the above example, the data in the file are stored using some default character encoding.

When the read operation is finished, the readyState becomes DONE, and the loadend is triggered. Simply drag and drop any file or folder onto the application icon or program window. After that HTML5 filereader api will access the file. File is a Blob that represents a file from the filesystem.