filereader

I have the following HTML Code: <input type='file' multiple> And Here's my JS Code: var inputFiles = document.getElementsByTagName("input")[0]; inputFiles.onchange = function(){ var fr = new FileReader(); for(var i = 0; i < inputFiles.files.length; i++){ fr.onload = function(){ console.log(i) // Prints "0, 3, 2, 1" in case of 4 chosen files } } fr.readAsDataURL(inputFiles.files[i]); } So my question is, how can I make this loop synchronous ? That is first wait for the file to finish loading then move on to the next file. Someone told me to use JS Promises. But I can't make it to work. Here's

import { Component, OnInit } from '@angular/core'; import { _HttpClient } from '@delon/theme'; @Component({ selector: 'app-item-two', templateUrl: './item-two.component.html', styleUrls: ['./item-two.component.less'] }) export class ItemTwoComponent implements OnInit { private status = []; private mystatus; constructor(private http:_HttpClient) { } ngOnInit() { let url='http://localhost:4200/assets/myjson/mydata.json'; this.http.get(url).subscribe((res:any)=>{ this.status=res.data1 console.log(this.status) }) } myUpload(e){ console.log(e) let fileReader = new FileReader(); fileReader.onload=()

Could you please help me with following issue. Goal Read file on client side (in browser via JS and HTML5 classes) line by line, without loading whole file to memory. Scenario I'm working on web page which should parse files on client side. Currently, I'm reading file as it described in this article . HTML: <input type="file" id="files" name="files[]" /> JavaScript: $("#files").on('change', function(evt){ // creating FileReader var reader = new FileReader(); // assigning handler reader.onloadend = function(evt) { lines = evt.target.result.split(/\r?\n/); lines.forEach(function (line) {

I try to convert a file that i get through an input file into a byte[]. I tried with a FileReader, but i must miss something : var bytes = []; var reader = new FileReader(); reader.onload = function () { bytes = reader.result; }; reader.readAsArrayBuffer(myFile); But in the end, my bytes var doesn't content a byte array. I saw this post : Getting byte array through input type = file but it doesn't ends with a byte[], and readAsBinaryString() is deprecated What do i miss? Faced a similar problem and its true the 'reader.result' doesn't end up as 'byte[]'. So I have cast it to Uint8Array object.

I have a file with information in it. It looks like: Michael 19 180 Miami George 25 176 Washington William 43 188 Seattle I want to split the lines and strings and read them. I want it to look like: Michael 19 180 Miami George ... i used a code like this: BufferedReader in = null; String read; int linenum; try{ in = new BufferedReader(new FileReader("fileeditor.txt")); } catch (FileNotFoundException e) {System.out.println("There was a problem: " + e);} try{ for (linenum = 0; linenum<100; linenum++){ read = in.readLine(); if(read == null){} else{ String[] splited = read.split("\\s+"); System

拖放 拖放是一种常见的特性，即抓取对象以后,从当前位置拖到另一个位置的过程。 dragenter 开始拖动 dragover 拖动中 dragleave 拖动放开 drop 拖动完成html 元素 <div id="target_box">把图片拖到这里试试</div> <div id="show-drop" title="拖动的图片可以在这里显示出来"></div> // js 部分 function addEventListener(dom,event,callback){ if(typeof dom == "string"){ document.querySelector(dom).addEventListener(event,callback); }else{ dom.addEventListener(event,callback); } } //开始拖动 addEventListener(document,"dragenter",function(e){ e.preventDefault(); document.querySelector("#target_box").setAttribute("class","droping"); }); //拖动中 addEventListener(document,"dragover",function(e){ e