filereader

问题 anyone knows if it is possible to get the FileReader API in chrome to read a file with the CP437 character set? Is there a place where I can list the available encodings? Currently, my workaround is to read it with CP1251 reader.readAsText(file, 'CP1251') and manually replace special characters, which is not cool! Is there other browsers which support this character set? Or do you have any better idea at a workaround? Edit: The file is parsed only in the browser, there is no backend available

问题 I have a typed array full of binary data that is being generated from an ArrayBuffer var myArr = new Uint8Array(myBuffer); I am presenting this to the user with var blob = new Blob(myArr, {type: "octet/stream"}; var blobURL = URL.createObjectURL(blob); and inserting a link that is "<a href=" + blobUrl + " download=" + filename "/a>" Later, I am letting the user select the file from disk, and using a file reader to do with var reader = new FileReader(); reader.onload = function () { console

问题 I have a typed array full of binary data that is being generated from an ArrayBuffer var myArr = new Uint8Array(myBuffer); I am presenting this to the user with var blob = new Blob(myArr, {type: "octet/stream"}; var blobURL = URL.createObjectURL(blob); and inserting a link that is "<a href=" + blobUrl + " download=" + filename "/a>" Later, I am letting the user select the file from disk, and using a file reader to do with var reader = new FileReader(); reader.onload = function () { console

问题 In below code , i'm trying to create a txt file and there i want to add some list of values. So here my approach is create a new file if file is not present and add the respective elements into it. Please see below , i'm unable to get my expected output, So can you help me with some idea so it will be very helpful public class MyTest { public static void main(String[] args) throws Exception { // TODO Auto-generated method stub SftpConn sftp = new SftpConn(); //sftp.sftpGetConnect(); List

问题 The below code works in chrome browser. $('#file').change(function(e) { var fileReader = new FileReader(), file = e.target.files[0]; if (typeof fileReader.readAsBinaryString == "function") { // section #1 var binaryString, base64; fileReader.onload = function(readerEvt) { binaryString = readerEvt.target.result; base64 = 'data:'+type+';base64,'+btoa(binaryString); socket.emit('image', { image: base64, size: file.size, filename: file.name }); } fileReader.readAsBinaryString(file); }else{ //

问题 The below code works in chrome browser. $('#file').change(function(e) { var fileReader = new FileReader(), file = e.target.files[0]; if (typeof fileReader.readAsBinaryString == "function") { // section #1 var binaryString, base64; fileReader.onload = function(readerEvt) { binaryString = readerEvt.target.result; base64 = 'data:'+type+';base64,'+btoa(binaryString); socket.emit('image', { image: base64, size: file.size, filename: file.name }); } fileReader.readAsBinaryString(file); }else{ //

问题 I'm trying to upload image or video in Angular. I wanted to display its preview. I have no problem in previewing the image, my problem is how can i preview the video? Please see this stackblitz link: CLICK HERE CODE onSelectFile(event) { if (event.target.files && event.target.files[0]) { var reader = new FileReader(); reader.readAsDataURL(event.target.files[0]); reader.onload = (event) => { this.url = event.target.result; } } } 回答1: You can decide if the file is type of video/image and then

问题 How do I install FileReaderSync in Angular2? It appears in the file node_modules/typescript/lib/lib.webworker.d.ts but not can use it. The FileReader I can use it without having to import anything. I need to do something different with FileReaderSync? error TS2304: Cannot find name 'FileReaderSync'. 回答1: I had the same issue few months ago, the solution was to write custom typings. main.bowser.d.ts interface FileReaderSync { readAsArrayBuffer(blob: Blob): any; readAsBinaryString(blob: Blob):

问题 I am having an issue converting the input file object into Base64 in my ionic v2 app . The issue occurs specifically when using the onload/onloadend reader as it gets called only occasionally (rarest of rarest to be very specific). I am able to get the file name, size and object when the user clicks on a image file which triggers the attachFile function, but after that when i convert the file object to Base64 using FileReader - onload or onloadend the callback function rarely gets called and

问题 I have a webpage with file upload functionality. The upload is performed in 5MB chunks. I want to calculate hash for each chunk before sending it to the server. The chunks are represented by Blob objects. In order to calculate the hash I am reading such blob into an ArrayBuffer using a native FileReader. Here is the code: var reader = new FileReader(); var getHash = function (blob, callback) { reader.onloadend = function (e) { var hash = util.hash(e.target.result); callback(hash); }; reader