filereader

问题 I would like to encrypt the contents of a file before uploading to our server .. we are using fineuploader. What I would like to do is: function onSubmitted(id) { var file = uploader.getFile(id); var reader = new FileReader(); reader.onload = function (e) { //encrypt here // but how do I save the file back to fineuploader? //then continue to submit/upload }; reader.readAsArrayBuffer(file); } is there any way of doing this out of the box or will I need to resort to rampant hackery :) :) 回答1:

问题 I'm relying on a class that is available in browser, FileReader I keep getting an error in webpack - 'FileReader' is not defined no-undef What is the correct way of dealing with this? I'm currently using a method where I just ignore the message. 回答1: The issue is that since webpack cannot find it as part of Node.js and since it is not available, it will cause an error. But there are a few ways of getting around this. Instead of var reader = new FileReader(); use Fix #1 var reader = new window

问题 I want to read in a grid of numbers (n*n) from a file and copy them into a multidimensional array, one int at a time. I have the code to read in the file and print it out, but dont know how to take each int. I think i need to splitstring method and a blank delimiter "" in order to take every charcter, but after that im not sure. I would also like to change blank characters to 0, but that can wait! This is what i have got so far, although it doesnt work. while (count <81 && (s = br.readLine())

问题 There seems to be a problem with File.ReadAllText because it's returning "NotSupportedException" even when the target file exists. No matter what is put into the parameter, it keeps throwing the same exception. using System; using System.IO; namespace MyNameSpace { class Program { static void Main(string[] args) { Console.WriteLine(File.ReadAllText(@"‪C:\Test.txt")); Console.ReadKey(); } } } And yes... Text.txt does exist in this directory. StreamReader has the exact same problem. Is there

问题 I am trying to read local image file to img element. But readAsDataURL() seems to return "undefined". What am I doing wrong? var input = $('.mapimage_input').get(0); console.log(input); // <input type="file" class="mapimage_input" accept="image/jpeg"> var file = input.files[0]; console.log(file); // File {webkitRelativePath: "", lastModifiedDate: Fri Mar 30 2012 12:32:03 GMT+0200, name: "avatar.jpg", type: "image/jpeg", size: 8724…} var fr = new FileReader(); var img = fr.readAsDataURL(file);

问题 I have a separated .txt file in which there is a list of "students" with their own mark on the side that goes from 0 to 10, here is an example on how the .txt looks like: Mark 2 Elen 3 Luke 7 Elen 9 Jhon 5 Mark 4 Elen 10 Luke 1 Jhon 1 Jhon 7 Elen 5 Mark 3 Mark 7 What I want to do is calculating the Average of each student (expressed in double ) so that the output would look like this: Mark: 4.0 Elen: 6.75 Luke: 4.0 Jhon: 4.33 Here is what I've come up with, for now I've only managed to use

问题 submitTCtoDB() { console.log("this.selectedFileList is: " + this.selectedFileList) this.readFile().then(() => { alert("ReadFile Finished now submit TC"); this.submitTC() }); } readFile() { return new Promise((resolve, reject) => { for (let i = 0; i < this.selectedFileList.length; i++) { let file = this.selectedFileList[i]; alert("file in redafile" + file.name) let fileReader = new FileReader(); fileReader.onload = () => { this.fileContent = fileReader.result; if (this.fileContent.indexOf("END

问题 I have an input type file <input type="file" class="userUploadButton" name="image" accept="image/*" on-change={this.setImage}/> and Vue - method "setImage" setImage(e){ const file = e.target.files[0]; if (!file.type.includes('image/')) { Vue.swal({ title: 'Error!', text: 'This is no image', type: 'error', }); return; } if(typeof FileReader === 'function'){ const reader = new FileReader(); reader.onload = (event) => { this.imgSrc = event.target.result; this.$refs.cropper.replace(event.target

问题 I set up a Apache server, put the page on the server and-problem solved. So I know this problem is caused by security settings in chrome. Now I wonder, is it possible to let a local webpage access local files? I'm going to make a page that allows dragging an local image onto it. Here's my code, which doesn't work in chrome The problem is reader.onload event didn't trigger, onerror did instead. So what's the reason? And how to fix it? Many thanks. var oImg=document.getElementById("img1"); oImg

问题 I would like to modify this code so that it works with a specific file only, but I can't figure out the correct URL parameter and all the code examples that I've found use a file selection dialog. <!DOCTYPE html> <html> <head> <title>reading file</title> <script type="text/javascript"> var reader = new FileReader(); function readText(that){ if(that.files && that.files[0]){ var reader = new FileReader(); reader.onload = function (e) { var output=e.target.result; //process text to show only