Talk about JS picture front end preview of FileReader and window. Url.createobjecturl
Preview Img:filereader mode
document.getElementById (' Imgfile '). onchange = function (e) {5 var ele = document.getElementById (' Imgfile '). Files[0];
var fr = new FileReader ();
Fr.onload = function (ele) {
var pvimg = new Image ();
PVIMG.S
FileReaderHTML5 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 methods as follows:1. Detection of
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
.
Onloadend
Read completion trigger, whether successful or failed
Onloadstart
Triggered when reading starts
Onprogress
Reading
Once the file is read, The result attribute of the instance will be filled in no matter whether it is successful or failed. If reading fails, the value of result is null. Otherwise, it is the result of reading. Most programs will capture this value when the file is successfully read.
4. Example
Select an image file in the file
Transferred from: http://blog.csdn.net/yaoyuan_difang/article/details/38582697HTML5 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 FileRea
File, fileinputstream, filereader, inputstreamreader, bufferedreader...
References:
L Chapter 12 of core Java
L detailed description of how to operate text files using Java
Http://java.ccidnet.com/art/3737/20041108/523627_1.html
L what is filereader class? What is the difference with fileinputstream ???
Http://book.hackbase.com/ask2/ask107572.htmOrganize and comprehend by yourself:Introduction:C language on
First of all to introduce the difference between InputStreamReader and FileReader, the specific content as follows:
InputStreamReader and BufferedReader. One of the most important classes is InputStreamReader, which is a bridge between bytes converted to characters. You can specify the encoding in the constructor, and the default encoding of the underlying operating system, such as GBK, will be used if unspecified.
Tag: Day false time his HTM click on the type of file base64一、选择图片(input的file类型)1. The file type of input is rendered as a button and a text. Click the button to open the File Selection window; file type input will have the Files property, which holds information about the document.2. Input.files is an array that consists of the file objects that are passed in. Each file object contains the following properties:LastModified: Numeric value that represe
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
. Detection of browser support for FileReader if (window. FileReader) {var fr = new FileReader (); //Add your code here} Else {Alert ("not supported by your browser!"); }2. If you want to limit the type of upload file, you can get the file object through the file selector and check the file type by the Type property
What methods and events does FileReader support? I will not introduce them here. if you are interested, go to the w3c official website to see the introduction of FileReader. here I will mainly introduce the common applications of FileReader, and fileReader. I will not explain the File API in detail here. we will use th
What methods and events does FileReader support? I will not introduce them here. If you are interested, go to the w3c official website to see the introduction of FileReader. Here I will mainly introduce the common applications of FileReader, and fileReader. I will not explain the File API in detail here. We will use th
Javascript uses fileReader to upload images and javascript to upload files
I will not explain the File API in detail here. We will use the File handle to read the File content. This is achieved through FileReader and through the FileReader interface, we can asynchronously load the file content into the memory and assign a js variable.
Copy codeThe Code is as foll
1 , FileReader Object Introduction1. Detection of browser support for FileReaderif (window. FileReader) {var fr = new FileReader ();Add your code here}else {Alert ("Not supported by your browser!");}Methods to invoke the FileReader objectThe
Recent research on point-to-point file transfer, think of a scheme filereader+webrtc.When I see FileReader, oh, good things ah, carefully look at the file API, or called the Web API.File API Official document file APISome of the MDN's open Web apis| MDNIt mainly consists of, filelist,blob,file,filereader and so on.Here we mainly discuss the
the data on the URL to send it.
Considering the Formdata to IE10 only support, if you want to support the lower version of IE, you can use the IFRAME.
In the beginning, the default form submission causes the page to be redirected, and the redirected rule is specified in target, can be specified as "_blank" as the A label, opened in a new window, and can be specified as an IFRAME, opened in the IFRAME. So you can get a hidden iframe that points to t
Use and difference of fileinputstream, filereader, inputstreamreader file, fileinputstream, filereader, inputstreamreader, and bufferedreaderReferences:Chapter 12 of core JavaDetailed description of http://java.ccidnet.com/art/3737/20041108/523627_1.html using Java to operate text filesWhat is filereader class? What is the difference with fileinputstream ???Http:
large enough.Therefore, it is recommended to use BufferedReader to wrap all of their read () operations with potentially expensive Reader (such as FileReader and InputStreamReader). For exampleBufferedReader in= new BufferedReader (New FileReader ("foo.in"));The input for the specified file is buffered.InputStreamReader (Java Platform SE 6)InputStreamReader is a bridge of byte flow to a character stream: i
enough.Therefore, it is recommended to use BufferedReader to wrap all of their read () operations with potentially expensive Reader (such as FileReader and InputStreamReader). For exampleBufferedReader in= new BufferedReader (New FileReader ("foo.in"));The input for the specified file is buffered.InputStreamReader (Java Platform SE 6)InputStreamReader is a bridge of byte flow to a character stream: it read
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