js filereader

What can File FileReader do?Ajax File Upload Example The FileReader object can read the BASE64 encoded data (readasdataurl) of the file, the 2 binary string (readasbinarystring), the text (Readastext), and are all asynchronous. Yes, email drag attachment upload can be used filereader with Ajax to complete. File ObjectThe file object can be obtained from the inp

There is a UTF-8-encoded text file that reads a string with filereader and then converts the character set: Str = newstring (Str. getbytes (), "UTF-8"); the result is that most Chinese characters are displayed normally, but some Chinese characters are still displayed as question marks!Java codePublic static list List Try {Bufferedreader BR = new bufferedreader (New filereader (filename ));String line = NULL

information about the file format, file name, size, and so on, which the user chooses. Therefore, it is very easy for us to validate the selected documents to determine whether they meet some of our requirements.In addition, the file API provides the FileReader type to read the data in the files.The FileReader type implements an asynchronous file-reading mechanism, similar to XMLHttpRequest, but it reads a

HTML5 defines FileReader as an important member of the file API for reading files, and the FileReader interface provides a way to read the file and an event model that contains the read result, according to the definition of the system. FileReader is very simple to use, you can create a FileReader object and invoke its

HTML5 defines FileReader as an important member of the file API for reading files, and the FileReader interface provides a way to read the file and an event model that contains the read result, according to the definition of the system. FileReader is very simple to use, you can create a FileReader object and invoke its

FileReader method Method Name Parameters Description Abort None Interrupt Read Readasbinarystring File (BLOB) To read a file as a binary code Readasdataurl File (BLOB) Read the file as Dataurl Readastext File, (BLOB) To read a file as text FileReader Events

File upload is now becoming more and more common, all social networking sites, media sites, such as Youku video, micro-blog, etc., all provide upload pictures, upload video and other functions. But in the past, web programmers know that uploading files with HTML forms can be a hassle, especially if you want to know some of the properties of a user's uploaded file, and you'll have to wait until it's uploaded. Unknown things uploaded to the server, it is possible to create security problems, ther

Used to read the file into memory and read the data in the file.The FileReader interface provides an asynchronous API that allows you to access the file system asynchronously in the main thread of the browser, reading the data in the file Method of FileReader interface Method Name Parameters Description Readasbinarystring File To read a fi

FileReader and FileWriter Source analysis 1. FileReader source code (based on jdk1.7.40) Package java.io; public class FileReader extends InputStreamReader {public filereader (String fileName) throws FileNotFoundException { Super (new FileInputStream (fil Java IO Series 21 inputstreamreader a

FileReader uploads images, Drag an image to display the image and adjust the size before uploading it to the server. Use HTML5 Dragenter Dragover Dragleave Drop The FileReader class is used for image display. Var files = event. dataTransfer. files; // gets the drag-and-drop image set. Filereader. readAsDataURL (files [I]); Use this. result show the im

InputStreamReader and BufferedReader. One of the most important classes is InputStreamReader, which is a bridge that converts bytes into characters. You can specify the encoding in the constructor, and if you do not specify it, the default encoding for the underlying operating system, such as GBK, is used.FileReader and InputStreamReader involve encoding conversions (specifying encoding or using OS default encoding) toCan appear garbled on different platforms! The FileInputStream is processed in

I. FileReader class1, construction method:FileReader fr = new FileReader (String fileName);//Use the construction method of the string parameter with the specified file. Creates the input stream object. and associate the source file.2, the Main method:int read (); Reads a single character, returns an int variable that represents the read character, and returns 1 if the end of the stream has been reached.int